| Number | Name | Difficulty | Solution |
|---|---|---|---|
| 1 | Two Sum | Easy | Solution |
| 2 | Add Two Numbers | Medium | Solution |
| 3 | Longest Substring Without Repeating Characters | Medium | Solution |
| 9 | Palindrome Number | Easy | Solution |
| 13 | Roman to Integer | Easy | Solution |
| 20 | Valid Parentheses | Easy | Solution |
| 21 | Merge Two Sorted Lists | Easy | Solution |
| 24 | Swap Nodes in Pairs | Medium | Solution |
| 26 | Remove Duplicates from Sorted Array | Easy | Solution |
| 27 | Remove Element | Easy | Solution |
| 28 | Find the Index of the First Occurrence in a String | Medium | Solution |
| 34 | Find First and Last Position of Element in Sorted Array | Medium | [Solution](/problems/ |
| 35 | Search Insert Position | Easy | Solution |
| 58 | Length of Last Word | Easy | Solution |
| 70 | Climbing Stairs | Easy | Solution |
| 71 | Simplify Path | Medium | Solution |
| 80 | Remove Duplicates from Sorted Array II | Medium | Solution |
| 82 | Remove Duplicates from Sorted List II | Medium | Solution |
| 83 | Remove Duplicates from Sorted List | Easy | Solution |
| 88 | Merge Sorted Array | Easy | Solution |
| 100 | Same Tree | Easy | Solution |
| 104 | Maximum Depth of Binary Tree | Easy | Solution |
| 116 | Populating Next Right Pointers in Each Node | Medium | Solution |
| 118 | Pascal's Triangle | Easy | Solution |
| 121 | Best Time to Buy and Sell Stock | Easy | Solution |
| 122 | Best Time to Buy and Sell Stock II | Medium | Solution |
| 134 | Gas Station | Medium | Solution |
| 136 | Single Number | Easy | Solution |
| 141 | Linked List Cycle | Easy | Solution |
| 142 | Linked List Cycle II | Medium | Solution |
| 169 | Majority Element | Easy | Solution |
| 175 | Combine Two Tables | Easy | Solution |
| 189 | Rotate Array | Medium | Solution |
| 191 | Number of 1 Bits | Easy | Solution |
| 195 | Tenth Line | Easy | Solution |
| 202 | Happy Number | Easy | Solution |
| 226 | Invert Binary Tree | Easy | Solution |
| 228 | Summary Ranges | Easy | Solution |
| 237 | Delete Node in a Linked List | Medium | Solution |
| 258 | Add Digits | Easy | Solution |
| 278 | First Bad Version | Easy | Solution |
| 283 | Move Zeroes | Easy | Solution |
| 344 | Reverse String | Easy | Solution |
| 410 | Split Array Largest Sum | Hard | Solution |
| 412 | Fizz Buzz | Easy | Solution |
| 438 | Find All Anagrams in a String | Medium | Solution |
| 441 | Arranging Coins | Easy | Solution |
| 442 | Find All Duplicates in an Array | Medium | Solution |
| 496 | Next Greater Element I | Easy | Solution |
| 509 | Fibonacci Number | Easy | Solution |
| 589 | N-ary Tree Preorder Traversal | Easy | Solution |
| 605 | Can Place Flowers | Easy | Solution |
| 617 | Merge Two Binary Trees | Easy | Solution |
| 704 | Binary Search | Easy | Solution |
| 705 | Design HashSet | Easy | Solution |
| 706 | Design HashMap | Easy | Solution |
| 709 | To Lower Case | Easy | Solution |
| 797 | All Paths From Source to Target | Medium | Solution |
| 849 | Maximize Distance to Closest Person | Medium | Solution |
| 876 | Middle of the Linked List | Easy | Solution |
| 881 | Boats to Save People | Medium | Solution |
| 896 | Monotonic Array | Easy | Solution |
| 938 | Range Sum of BST | Easy | Solution |
| 976 | Subarray Sums Divisible by K | Medium | Solution |
| 976 | Largest Perimeter Triangle | Easy | Solution |
| 977 | Squares of a Sorted Array | Easy | Solution |
| 991 | Broken Calculator | Medium | Solution |
| 1009 | Complement of Base 10 Integer | Easy | Solution |
| 1010 | Pairs of Songs With Total Durations Divisible by 60 | Medium | Solution |
| 1051 | Height Checker | Easy | Solution |
| 1108 | Defanging an IP Address | Easy | Solution |
| 1207 | Unique Number of Occurrences | Easy | Solution |
| 1217 | Minimum Cost to Move Chips to The Same Position | Easy | Solution |
| 1232 | Check If It Is a Straight Line | Easy | Solution |
| 1281 | Subtract the Product and Sum of Digits of an Integer | Easy | Solution |
| 1290 | Convert Binary Number in a Linked List to Integer | Easy | Solution |
| 1332 | Remove Palindromic Subsequences | Easy | Solution |
| 1342 | Number of Steps to Reduce a Number to Zero | Easy | Solution |
| 1351 | Count Negative Numbers in a Sorted Matrix | Easy | Solution |
| 1365 | How Many Numbers Are Smaller Than the Current Number | Easy | Solution |
| 1389 | Create Target Array in the Given Order | Easy | Solution |
| 1413 | Minimum Value to Get Positive Step by Step Sum | Easy | Solution |
| 1446 | Consecutive Characters | Easy | Solution |
| 1470 | Shuffle the Array | Easy | Solution |
| 1480 | Running Sum of 1d Array | Easy | Solution |
| 1491 | Average Salary Excluding the Minimum and Maximum Salary | Easy | Solution |
| 1502 | Can Make Arithmetic Progression From Sequence | Easy | Solution |
| 1512 | Number of Good Pairs | Easy | Solution |
| 1523 | Count Odd Numbers in an Interval Range | Easy | Solution |
| 1528 | Shuffle String | Easy | Solution |
| 1572 | Matrix Diagonal Sum | Easy | Solution |
| 1588 | Sum of All Odd Length Subarrays | Easy | Solution |
| 1641 | Count Sorted Vowel Strings | Medium | Solution |
| 1672 | Richest Customer Wealth | Easy | Solution |
| 1684 | Count the Number of Consistent Strings | Easy | Solution |
| 1720 | Decode XORed Array | Easy | Solution |
| 1741 | Find Total Time Spent by Each Employee | Easy | Solution |
| 1757 | Recyclable and Low Fat Products | Easy | Solution |
| 1768 | Merge Strings Alternately | Easy | Solution |
| 1795 | Rearrange Products Table | Easy | Solution |
| 1822 | Sign of the Product of an Array | Easy | Solution |
| 1832 | Check if the Sentence Is Pangram | Easy | Solution |
| 1909 | Remove One Element to Make the Array Strictly Increasing | Easy | Solution |
| 1920 | Build Array from Permutation | Easy | Solution |
| 1929 | Concatenation of Array | Easy | Solution |
| 2011 | Final Value of Variable After Performing Operations | Easy | Solution |
| 2089 | Find Target Indices After Sorting Array | Easy | Solution |
| 2114 | Maximum Number of Words Found in Sentences | Easy | Solution |
| 2220 | Minimum Bit Flips to Convert Number | Easy | Solution |