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C++ Solutions of 180 Questions [30 Days] of Strivers SDE Sheet , YouTube Channel TAKEUFORWARD (Raj Vikramaditya bhaiyaa)

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Striver SDE Sheet [30 Days Challenge]

Link to the SDE Sheet: view

Collection of the solutions in C++

Important Questions

S.No. Question Name Logic Used Topic Date
1 Missing and Repeating repeated xor Bit Manipulation 02 June 21
2 Duplicate Number Linked List Cycle Detection Arrays and Linked List 02 June 21
3 Merge Sorted Space in O(1) Space Gap Method: Shear Sort Sorting 02 June 21
4 Set Matrix Zeros in place, bottom to top, right to left Matrix 03 June 21
5 Reverse Pairs Count count inversions using merge sort Arrays 04 June 21
6 Reverse in Groups of K addFirst, original and temp pointers Linked List 06 June 21
7 Clone list with random pointers adjacent copy nodes Linked List 07 June 21
8 Trapping Rainwater 2 pointers, min(max_left, max_right) - arr[i] Two Pointers 07 June 21
9 Job Sequencing n-slots, job index in sorted array Greedy 08 June 21
10 Minimum Railways Platforms sorted: arrival vs dep times Greedy 08 June 21
11 Combination Sum without repetition recursion with 2 options; avoid duplicates Bactracking 12 June 21
12 Permutations of an Array fixing first position, all swaps Backtracking 13 June 21
13 Rat in a Maze backtracking, dfs calls in 4 directions Backtracking 14 June 21
14 M Coloring Graph backtracking, trying every color Bactracking 17 June 21
15 Median of 2 Sorted Arrays Contribution size partitioning of smaller array Binary Search 17 June 21
16 Allocate min pages monotonic search space of min possible max upper bound Binary Search 25 June 21
17 Median in Row sorted matrix count of left part of sorted array; upper_bound Binary Search 26 June 21
18 Count Total Set Bits f(n)=x*2^(x-1)+(n-2^x+1)+f(n-2^x) Recursion 26 June 21
19 Find nearest power of 2 <= n one by one set all the bits Bit Manipulation 26 June 21
20 Square of a number Left shift + recursion Bit Manipulation 27 June 21
21 LRU Cache Design Hashing + DLL {latest used on left near head} Linked List 30 June 21
22 Sliding Window Maximum Deque + store max at dq front Deque + Sliding Window 01 July 21
23 Largest rectangle in Histogram 3 vars: i-->nse, top = height, below top = pse Stacks 01 July 21
24 Longest Palindromic Substring Two pointer consecutive + 1 gap apart expansion Strings 01 July 21
25 Integer to Roman Store the exception symbols like 1, 4, 5, 9, etc Maths 01 July 21

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C++ Solutions of 180 Questions [30 Days] of Strivers SDE Sheet , YouTube Channel TAKEUFORWARD (Raj Vikramaditya bhaiyaa)

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