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"For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby."

Level 2

Day 1 Implementation/Simulation

Day 2 String

Day 3 Linked List
0019 Remove Nth Node From End of List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L) 54 87.87
0234 Palindrome Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 96 95.67

Day 4 Linked List
0148 Sort List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(log(N))_Space_O(log(N)) 141 97.14

Day 5 Greedy

Day 6 Tree
0226 Invert Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 52 81.65

Day 7 Tree
0543 Diameter of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 61 80.89
0437 Path Sum III Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 68 86.71

Day 8 Binary Search
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45 96.82
0033 Search in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 43 98.54

Day 9 Binary Search Tree
0230 Kth Smallest Element in a BST Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 54 97.22

Day 10 Graph/BFS/DFS

Day 11 Graph/BFS/DFS

Day 12 Dynamic Programming
0198 House Robber Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 51 77.29
0322 Coin Change Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 85 86.14

Day 13 Dynamic Programming
0416 Partition Equal Subset Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums) 91 74.38
0152 Maximum Product Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 53 87.50

Day 14 Sliding Window/Two Pointer
0003 Longest Substring Without Repeating Characters Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1) 65 90.77
0076 Minimum Window Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1) 82 82.17

Day 15 Tree
0101 Symmetric Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) 49 98.54

Day 16 Design
0155 Min Stack Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 84 92.72
0208 Implement Trie (Prefix Tree) Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 168 80.99

Day 17 Interval
0056 Merge Intervals Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 84 92.06

Day 18 Stack

Day 19 Union Find

Day 20 Brute Force/Backtracking
0039 Combination Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 65 86.86
0046 Permutations Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 56 96.26

Udemy

Udemy Integers
0136 Single Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 56 85.48
0007 Reverse Integer Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_Interview_Questions, Math 56 95.68
0009 Palindrome Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Math 137 88.64

Udemy Strings
0003 Longest Substring Without Repeating Characters Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1) 65 90.77
0020 Valid Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) 50 95.90
0005 Longest Palindromic Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 68 95.34
0394 Decode String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) 51 81.02
0049 Group Anagrams Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 93 97.29

Udemy Binary Search
0033 Search in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 43 98.54
0153 Find Minimum in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 42 98.87

Udemy Arrays
0121 Best Time to Buy and Sell Stock Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 56 99.56
0283 Move Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 71 91.63
0001 Two Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) 54 91.72
0189 Rotate Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 75 97.25
0055 Jump Game Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 58 91.95
0075 Sort Colors Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 43 97.41
0238 Product of Array Except Self Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n) 89 64.48
0041 First Missing Positive Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) 55 98.51
0239 Sliding Window Maximum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Big_O_Time_O(n*k)_Space_O(n+k) 216 99.50

Udemy Two Pointers
0042 Trapping Rain Water Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1) 46 99.52
0015 3Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 148 92.62

Udemy Famous Algorithm
0053 Maximum Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 66 90.36
0169 Majority Element Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 50 96.16

Udemy Sorting Algorithms

Udemy 2D Arrays/Matrix
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45 96.82
0048 Rotate Image Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 45 95.31
0073 Set Matrix Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m*n)_Space_O(1) 61 97.66
0056 Merge Intervals Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 84 92.06

Udemy Linked List
0114 Flatten Binary Tree to Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Big_O_Time_O(N)_Space_O(N) 55 90.66
0024 Swap Nodes in Pairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 59 62.67
0142 Linked List Cycle II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 59 94.39
0141 Linked List Cycle Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 59 93.37
0206 Reverse Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 51 92.87
0021 Merge Two Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 59 86.77
0160 Intersection of Two Linked Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1) 67 93.58
0234 Palindrome Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 96 95.67
0138 Copy List with Random Pointer Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N) 52 88.27
0025 Reverse Nodes in k-Group Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k) 74 66.83
0146 LRU Cache Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Big_O_Time_O(1)_Space_O(capacity) 473 94.72

Udemy Tree Stack Queue
0094 Binary Tree Inorder Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) 45 97.30
0102 Binary Tree Level Order Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 60 97.47
0543 Diameter of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 61 80.89
0226 Invert Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 52 81.65
0104 Maximum Depth of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 51 97.14
0124 Binary Tree Maximum Path Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 61 96.73
0098 Validate Binary Search Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 51 98.35
0236 Lowest Common Ancestor of a Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 59 96.11

Udemy Trie and Heap
0208 Implement Trie (Prefix Tree) Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 168 80.99

Udemy Graph
0200 Number of Islands Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 61 96.71

Udemy Dynamic Programming
0139 Word Break Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 56 88.44
0152 Maximum Product Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 53 87.50
0198 House Robber Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 51 77.29
0070 Climbing Stairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 44 94.58
0064 Minimum Path Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 48 99.67
0300 Longest Increasing Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 57 93.75
1143 Longest Common Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 94 80.56
0072 Edit Distance Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 68 95.20
0010 Regular Expression Matching Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m*n)_Space_O(m*n) 69 92.65

Udemy Backtracking/Recursion
0022 Generate Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) 60 62.03
0039 Combination Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 65 86.86
0078 Subsets Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n) 50 94.61
0017 Letter Combinations of a Phone Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) 52 79.11
0046 Permutations Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 56 96.26

Udemy Bit Manipulation
0338 Counting Bits Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) 69 86.81

Udemy Design
0155 Min Stack Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 84 92.72

Data Structure I

Day 1 Array
0053 Maximum Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 66 90.36

Day 2 Array
0001 Two Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) 54 91.72

Day 3 Array
0121 Best Time to Buy and Sell Stock Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 56 99.56

Day 4 Array

Day 5 Array
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45 96.82

Day 6 String

Day 7 Linked List
0141 Linked List Cycle Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 59 93.37
0021 Merge Two Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 59 86.77

Day 8 Linked List
0206 Reverse Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 51 92.87

Day 9 Stack Queue
0020 Valid Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) 50 95.90

Day 10 Tree
0094 Binary Tree Inorder Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) 45 97.30

Day 11 Tree
0102 Binary Tree Level Order Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 60 97.47
0104 Maximum Depth of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 51 97.14
0101 Symmetric Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) 49 98.54

Day 12 Tree
0226 Invert Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 52 81.65

Day 13 Tree

Day 14 Tree
0098 Validate Binary Search Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 51 98.35

Data Structure II

Day 1 Array
0136 Single Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 56 85.48
0169 Majority Element Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 50 96.16
0015 3Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 148 92.62

Day 2 Array
0075 Sort Colors Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 43 97.41
0056 Merge Intervals Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 84 92.06

Day 3 Array
0048 Rotate Image Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 45 95.31

Day 4 Array
0240 Search a 2D Matrix II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1) 58 64.44

Day 5 Array
0238 Product of Array Except Self Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n) 89 64.48
0560 Subarray Sum Equals K Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n) 70 92.45

Day 6 String

Day 7 String
0763 Partition Labels Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 54 94.74

Day 8 String
0049 Group Anagrams Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 93 97.29

Day 9 String
0005 Longest Palindromic Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 68 95.34

Day 10 Linked List
0002 Add Two Numbers Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)) 92 77.86
0142 Linked List Cycle II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 59 94.39

Day 11 Linked List
0160 Intersection of Two Linked Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1) 67 93.58

Day 12 Linked List
0024 Swap Nodes in Pairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 59 62.67

Day 13 Linked List
0025 Reverse Nodes in k-Group Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k) 74 66.83

Day 14 Stack Queue
0155 Min Stack Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 84 92.72

Day 15 Tree
0105 Construct Binary Tree from Preorder and Inorder Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Big_O_Time_O(N)_Space_O(N) 65 96.47

Day 16 Tree

Day 17 Tree
0230 Kth Smallest Element in a BST Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 54 97.22

Day 18 Tree
0236 Lowest Common Ancestor of a Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 59 96.11

Day 19 Graph

Day 20 Heap Priority Queue
0215 Kth Largest Element in an Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Big_O_Time_O(n*log(n))_Space_O(log(n)) 148 54.45
0347 Top K Frequent Elements Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Big_O_Time_O(n*log(n))_Space_O(k) 62 87.48

Day 21 Heap Priority Queue

Algorithm I

Day 1 Binary Search
0035 Search Insert Position Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 51 80.95

Day 2 Two Pointers
0189 Rotate Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 75 97.25

Day 3 Two Pointers
0283 Move Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 71 91.63

Day 4 Two Pointers

Day 5 Two Pointers
0019 Remove Nth Node From End of List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L) 54 87.87

Day 6 Sliding Window
0003 Longest Substring Without Repeating Characters Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1) 65 90.77

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Breadth First Search Depth First Search

Day 10 Recursion Backtracking
0021 Merge Two Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 59 86.77
0206 Reverse Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 51 92.87

Day 11 Recursion Backtracking
0046 Permutations Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 56 96.26

Day 12 Dynamic Programming
0070 Climbing Stairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 44 94.58
0198 House Robber Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 51 77.29

Day 13 Bit Manipulation

Day 14 Bit Manipulation
0136 Single Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 56 85.48

Algorithm II

Day 1 Binary Search
0034 Find First and Last Position of Element in Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 45 98.05
0033 Search in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 43 98.54
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45 96.82

Day 2 Binary Search
0153 Find Minimum in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 42 98.87

Day 3 Two Pointers
0015 3Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 148 92.62

Day 4 Two Pointers
0011 Container With Most Water Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 57 98.23

Day 5 Sliding Window
0438 Find All Anagrams in a String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 69 96.69

Day 6 Breadth First Search Depth First Search
0200 Number of Islands Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 61 96.71

Day 7 Breadth First Search Depth First Search

Day 8 Breadth First Search Depth First Search

Day 9 Recursion Backtracking
0078 Subsets Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n) 50 94.61

Day 10 Recursion Backtracking
0039 Combination Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 65 86.86

Day 11 Recursion Backtracking
0017 Letter Combinations of a Phone Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) 52 79.11
0022 Generate Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) 60 62.03
0079 Word Search Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n) 327 95.78

Day 12 Dynamic Programming
0055 Jump Game Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 58 91.95

Day 13 Dynamic Programming
0045 Jump Game II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 50 95.93
0062 Unique Paths Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 40 98.97

Day 14 Dynamic Programming
0005 Longest Palindromic Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 68 95.34

Day 15 Dynamic Programming
0139 Word Break Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 56 88.44

Day 16 Dynamic Programming
0300 Longest Increasing Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 57 93.75

Day 17 Dynamic Programming
1143 Longest Common Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 94 80.56

Day 18 Dynamic Programming
0072 Edit Distance Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 68 95.20
0322 Coin Change Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 85 86.14

Day 19 Bit Manipulation

Day 20 Others

Day 21 Others

Binary Search I

Day 1

Day 2
0035 Search Insert Position Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 51 80.95

Day 3

Day 4

Day 5
0034 Find First and Last Position of Element in Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 45 98.05

Day 6

Day 7

Day 8
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45 96.82

Day 9

Day 10

Day 11
0033 Search in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 43 98.54

Day 12
0153 Find Minimum in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 42 98.87

Binary Search II

Day 1

Day 2

Day 3
0300 Longest Increasing Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 57 93.75

Day 4

Day 5
0287 Find the Duplicate Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Big_O_Time_O(n)_Space_O(n) 60 98.11

Day 6

Day 7

Day 8
0240 Search a 2D Matrix II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1) 58 64.44

Day 9

Day 10

Day 11

Day 12

Day 13

Day 14

Day 15

Day 16

Day 17

Day 18

Day 19

Day 20

Dynamic Programming I

Day 1

Day 2
0070 Climbing Stairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 44 94.58

Day 3
0198 House Robber Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 51 77.29

Day 4
0055 Jump Game Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 58 91.95
0045 Jump Game II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 50 95.93

Day 5
0053 Maximum Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 66 90.36

Day 6
0152 Maximum Product Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 53 87.50

Day 7
0121 Best Time to Buy and Sell Stock Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 56 99.56

Day 8

Day 9
0139 Word Break Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 56 88.44
0042 Trapping Rain Water Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1) 46 99.52

Day 10

Day 11
0096 Unique Binary Search Trees Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(1) 45 96.00

Day 12

Day 13

Day 14

Day 15
0062 Unique Paths Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 40 98.97

Day 16
0064 Minimum Path Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 48 99.67
0221 Maximal Square Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 83 79.70

Day 17
0005 Longest Palindromic Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 68 95.34

Day 18
0300 Longest Increasing Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 57 93.75

Day 19
1143 Longest Common Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 94 80.56
0072 Edit Distance Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 68 95.20

Day 20
0322 Coin Change Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 85 86.14

Day 21

Programming Skills I

Day 1 Basic Data Type

Day 2 Operator

Day 3 Conditional Statements

Day 4 Loop

Day 5 Function

Day 6 Array
0283 Move Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 71 91.63

Day 7 Array

Day 8 String

Day 9 String

Day 10 Linked List and Tree
0104 Maximum Depth of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 51 97.14

Day 11 Containers and Libraries

Day 12 Class and Object

Programming Skills II

Day 1

Day 2

Day 3

Day 4

Day 5

Day 6
0739 Daily Temperatures Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(n) 194 97.36

Day 7
0048 Rotate Image Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 45 95.31

Day 8

Day 9

Day 10

Day 11
0049 Group Anagrams Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 93 97.29

Day 12
0438 Find All Anagrams in a String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 69 96.69

Day 13

Day 14
0138 Copy List with Random Pointer Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N) 52 88.27

Day 15
0002 Add Two Numbers Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)) 92 77.86

Day 16

Day 17

Day 18
0155 Min Stack Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 84 92.72

Day 19

Day 20

Graph Theory I

Day 1 Matrix Related Problems
0200 Number of Islands Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 61 96.71

Day 2 Matrix Related Problems

Day 3 Matrix Related Problems

Day 4 Matrix Related Problems

Day 5 Matrix Related Problems

Day 6 Matrix Related Problems

Day 7 Standard Traversal

Day 8 Standard Traversal

Day 9 Standard Traversal

Day 10 Standard Traversal

Day 11 Breadth First Search

Day 12 Breadth First Search

Day 13 Graph Theory

Day 14 Graph Theory

SQL I

Day 1 Select

Day 2 Select and Order

Day 3 String Processing Functions

Day 4 Union and Select

Day 5 Union

Day 6 Union

Day 7 Function

Day 8 Function

Day 9 Control of Flow

Day 10 Where

Level 1

Day 1 Prefix Sum

Day 2 String

Day 3 Linked List
0021 Merge Two Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 59 86.77
0206 Reverse Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 51 92.87

Day 4 Linked List
0142 Linked List Cycle II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 59 94.39

Day 5 Greedy
0121 Best Time to Buy and Sell Stock Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 56 99.56

Day 6 Tree
0102 Binary Tree Level Order Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 60 97.47

Day 7 Binary Search

Day 8 Binary Search Tree
0098 Validate Binary Search Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 51 98.35

Day 9 Graph/BFS/DFS
0200 Number of Islands Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 61 96.71

Day 10 Dynamic Programming
0070 Climbing Stairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 44 94.58

Day 11 Dynamic Programming
0062 Unique Paths Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 40 98.97

Day 12 Sliding Window/Two Pointer
0438 Find All Anagrams in a String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 69 96.69

Day 13 Hashmap
0001 Two Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) 54 91.72

Day 14 Stack
0394 Decode String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) 51 81.02

Day 15 Heap

Algorithms

# Title Difficulty Tag Time, ms Time, %
1143 Longest Common Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 94
0763 Partition Labels Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String, Big_O_Time_O(n)_Space_O(1) 54
0739 Daily Temperatures Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6, Big_O_Time_O(n)_Space_O(n) 194
0647 Palindromic Substrings Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n) 60
0560 Subarray Sum Equals K Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array, Big_O_Time_O(n)_Space_O(n) 70
0543 Diameter of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 61
0494 Target Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Backtracking, Big_O_Time_O(n*(sum+s))_Space_O(n*(sum+s)) 77
0438 Find All Anagrams in a String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1) 69
0437 Path Sum III Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n) 68
0416 Partition Equal Subset Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums) 91
0394 Decode String Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 51
0347 Top K Frequent Elements Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(k) 62
0338 Counting Bits Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) 69
0322 Coin Change Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(amount) 85
0300 Longest Increasing Subsequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Big_O_Time_O(n*log_n)_Space_O(n) 57
0295 Find Median from Data Stream Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Big_O_Time_O(n*log_n)_Space_O(n) 335
0287 Find the Duplicate Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n) 60
0283 Move Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 71
0240 Search a 2D Matrix II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8, Big_O_Time_O(n+m)_Space_O(1) 58
0239 Sliding Window Maximum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays, Big_O_Time_O(n*k)_Space_O(n+k) 216
0238 Product of Array Except Self Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays, Big_O_Time_O(n^2)_Space_O(n) 89
0236 Lowest Common Ancestor of a Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 59
0234 Palindrome Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1) 96
0230 Kth Smallest Element in a BST Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 54
0226 Invert Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 52
0221 Maximal Square Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Big_O_Time_O(m*n)_Space_O(m*n) 83
0215 Kth Largest Element in an Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(log(n)) 148
0208 Implement Trie (Prefix Tree) Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 168
0207 Course Schedule Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Big_O_Time_O(N)_Space_O(N) 68
0206 Reverse Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 51
0200 Number of Islands Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph, Big_O_Time_O(M*N)_Space_O(M*N) 61
0198 House Robber Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 51
0189 Rotate Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 75
0169 Majority Element Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1) 50
0160 Intersection of Two Linked Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List, Big_O_Time_O(M+N)_Space_O(1) 67
0155 Min Stack Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18, Level_2_Day_16_Design, Udemy_Design, Big_O_Time_O(1)_Space_O(N) 84
0153 Find Minimum in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 42
0152 Maximum Product Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 53
0148 Sort List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List, Big_O_Time_O(log(N))_Space_O(log(N)) 141
0146 LRU Cache Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List, Big_O_Time_O(1)_Space_O(capacity) 473
0142 Linked List Cycle II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 59
0141 Linked List Cycle Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 59
0139 Word Break Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9, Udemy_Dynamic_Programming, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 56
0138 Copy List with Random Pointer Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N) 52
0136 Single Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers, Big_O_Time_O(N)_Space_O(1) 56
0131 Palindrome Partitioning Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(N*2^N)_Space_O(2^N*N) 203
0128 Longest Consecutive Sequence Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find, Big_O_Time_O(N_log_N)_Space_O(1) 92
0124 Binary Tree Maximum Path Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N) 61
0121 Best Time to Buy and Sell Stock Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy, Udemy_Arrays, Big_O_Time_O(N)_Space_O(1) 56
0114 Flatten Binary Tree to Linked List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N) 55
0105 Construct Binary Tree from Preorder and Inorder Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Big_O_Time_O(N)_Space_O(N) 65
0104 Maximum Depth of Binary Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(H) 51
0102 Binary Tree Level Order Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N) 60
0101 Symmetric Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_2_Day_15_Tree, Big_O_Time_O(N)_Space_O(log(N)) 49
0098 Validate Binary Search Tree Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(log(N)) 51
0096 Unique Binary Search Trees Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11, Big_O_Time_O(n)_Space_O(1) 45
0094 Binary Tree Inorder Traversal Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 45
0084 Largest Rectangle in Histogram Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n_log_n)_Space_O(log_n) 78
0079 Word Search Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n) 327
0078 Subsets Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n*2^n) 50
0076 Minimum Window Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Big_O_Time_O(s.length())_Space_O(1) 82
0075 Sort Colors Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 43
0074 Search a 2D Matrix Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 45
0073 Set Matrix Zeroes Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix, Big_O_Time_O(m*n)_Space_O(1) 61
0072 Edit Distance Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 68
0070 Climbing Stairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 44
0064 Minimum Path Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 48
0062 Unique Paths Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 40
0056 Merge Intervals Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n_log_n)_Space_O(n) 84
0055 Jump Game Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 58
0053 Maximum Subarray Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1) 66
0051 N-Queens Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(N!)_Space_O(N) 57
0049 Group Anagrams Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings, Big_O_Time_O(n*k_log_k)_Space_O(n) 93
0048 Rotate Image Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n^2)_Space_O(1) 45
0046 Permutations Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(n*n!)_Space_O(n+n!) 56
0045 Jump Game II Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4, Big_O_Time_O(n)_Space_O(1) 50
0042 Trapping Rain Water Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers, Big_O_Time_O(n)_Space_O(1) 46
0041 First Missing Positive Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n) 55
0039 Combination Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n+2^n) 65
0035 Search Insert Position Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2, Big_O_Time_O(log_n)_Space_O(1) 51
0034 Find First and Last Position of Element in Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5, Big_O_Time_O(log_n)_Space_O(1) 45
0033 Search in Rotated Sorted Array Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 43
0032 Longest Valid Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, String, Dynamic_Programming, Stack, Big_O_Time_O(n)_Space_O(1) 56
0031 Next Permutation Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 47
0025 Reverse Nodes in k-Group Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(k) 74
0024 Swap Nodes in Pairs Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1) 59
0023 Merge k Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(k*n*log(k))_Space_O(log(k)) 76
0022 Generate Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n) 60
0021 Merge Two Sorted Lists Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(m+n)_Space_O(m+n) 59
0020 Valid Parentheses Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 50
0019 Remove Nth Node From End of List Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List, Big_O_Time_O(L)_Space_O(L) 54
0017 Letter Combinations of a Phone Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(4^n)_Space_O(n) 52
0015 3Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 148
0011 Container With Most Water Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers, Big_O_Time_O(n)_Space_O(1) 57
0010 Regular Expression Matching Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 69
0009 Palindrome Number Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Math, Udemy_Integers 137
0008 String to Integer (atoi) Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_Interview_Questions, String 56
0007 Reverse Integer Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_Interview_Questions, Math, Udemy_Integers 56
0006 Zigzag Conversion Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium String 64
0005 Longest Palindromic Substring Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 68
0004 Median of Two Sorted Arrays Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer, Big_O_Time_O(log(min(N,M)))_Space_O(1) 86
0003 Longest Substring Without Repeating Characters Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings, Big_O_Time_O(n)_Space_O(1) 65
0002 Add Two Numbers Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15, Big_O_Time_O(max(N,M))_Space_O(max(N,M)) 92
0001 Two Sum Java Kotlin TypeScript Scala Ruby PHP C# Go Cpp Python Swift Elixir Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n) 54

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104 LeetCode algorithm problem solutions.

leetcode-in-all.github.io

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