Total completed: 102/1531
| # | Title | Difficulty | C | C++ | Notes |
|---|---|---|---|---|---|
| 1 | Two Sum | Easy | C | C++ | Hash |
| 2 | Add Two Numbers | Medium | C++ | Linked List | |
| 4 | Median of Two Sorted Arrays | Hard | C++ | Sort | |
| 6 | ZigZag Conversion | Medium | C++ | String | |
| 7 | Reverse Integer | Easy | C | Math | |
| 8 | String to Integer (atoi) | Medium | C++ | String | |
| 9 | Palindrome Number | Easy | C | Math | |
| 13 | Roman to Integer | Easy | C | String | |
| 14 | Longest Common Prefix | Easy | C | String | |
| 17 | Letter Combinations of a Phone Number | Medium | C++ | Combinatorics | |
| 19 | Remove Nth Node From End of List | Medium | C++ | Linked List | |
| 20 | Valid Parentheses | Easy | C++ | String | |
| 21 | Merge Two Sorted Lists | Easy | C | Sort | |
| 26 | Remove Duplicates from Sorted Array | Easy | C | Array | |
| 27 | Remove Element | Easy | C | Array | |
| 28 | Implement strStr() | Easy | C++ | String | |
| 35 | Search Insert Position | Easy | C | Array | |
| 46 | Permutations | Medium | C++ | Combinatorics | |
| 48 | Rotate Image | Medium | C++ | Geometry | |
| 53 | Maximum Subarray | Easy | C | Array | |
| 58 | Length of Last Word | Easy | C | String | |
| 66 | Plus One | Easy | C | Array | |
| 69 | Square Root | Easy | C | Math | |
| 70 | Climbing Stairs | Easy | C | Math | |
| 83 | Remove Duplicates from Sorted List | Easy | C | Linked List | |
| 88 | Merge Sorted Array | Easy | C | Sort | |
| 100 | Same Tree | Easy | C | Tree | |
| 101 | Symmetric Tree | Easy | C | Tree | |
| 104 | Maximum Depth of Binary Tree | Easy | C | Tree | |
| 111 | Minimum Depth of Binary Tree | Easy | C++ | Tree | |
| 112 | Path Sum | Easy | C++ | Tree | |
| 118 | Pascal's Triangle | Easy | C | C++ | Array |
| 119 | Pascal's Triangle II | Easy | C++ | Array | |
| 120 | Triangle | Medium | C++ | Tree | |
| 121 | Best Time to Buy and Sell Stock | Easy | C | Array | |
| 136 | Single Number | Easy | C | Bit Manipulation | |
| 141 | Linked List Cycle | Easy | C | Linked List | |
| 151 | Reverse Words in a String | Medium | C++ | String | |
| 155 | Min Stack | Easy | C++ | Stack | |
| 169 | Majority Element | Easy | C++ | Array | |
| 171 | Excel Sheet Column Number | Easy | C++ | Math | |
| 172 | Factorial Trailing Zeroes | Easy | C++ | Math | |
| 189 | Rotate Array | Easy | C++ | Array | |
| 191 | Number of 1 Bits | Easy | C++ | Math | |
| 202 | Happy Number | Easy | C++ | Hash | |
| 206 | Reverse Linked List | Easy | C++ | Linked List | |
| 231 | Power of Two | Easy | C++ | Math | |
| 237 | Delete Node in a Linked List | Easy | C++ | Linked List | |
| 242 | Valid Anagram | Easy | C++ | Hash | |
| 283 | Move Zeroes | Easy | C++ | Array | |
| 326 | Power of Three | Easy | C++ | Math | |
| 344 | Reverse String | Easy | C++ | String | |
| 367 | Valid Perfect Square | Easy | C++ | Math | |
| 387 | First Unique Character in a String | Easy | C++ | String | |
| 412 | Fizz Buzz | Easy | C++ | String | |
| 509 | Fibonacci Number | Easy | C++ | Math | |
| 589 | N-ary Tree Preorder Traversal | Easy | C++ | Tree | |
| 709 | To Lower Case | Easy | C++ | String | |
| 728 | Self Dividing Numbers | Easy | C++ | Math | |
| 739 | Daily Temperatures | Medium | C | Stack | |
| 771 | Jewels and Stones | Easy | C++ | String | |
| 807 | Max Increase to Keep City Skyline | Medium | C++ | Array | |
| 832 | Flipping an Image | Easy | C++ | Array | |
| 876 | Middle of the Linked List | Easy | C++ | Linked List | |
| 912 | Sort an Array | Medium | C++ | Sort | |
| 938 | Range Sum of BST | Easy | C++ | Tree | |
| 965 | Univalued Binary Tree | Easy | C++ | Tree | |
| 1108 | Defanging an IP Address | Easy | C++ | String | |
| 1114 | Print in Order | Easy | C++ | Multithreading | |
| 1200 | Minimum Absolute Difference | Easy | C++ | Sort | |
| 1207 | Unique Number of Occurrences | Easy | C++ | Hash | |
| 1221 | Split a String in Balanced Strings | Easy | C++ | String | |
| 1252 | Cells with Odd Values in a Matrix | Easy | C++ | Array | |
| 1281 | Subtract the Product and Sum of Digits of an Integer | Easy | C++ | Math | |
| 1290 | Convert Binary Number in a Linked List to Integer | Easy | C++ | Math | |
| 1295 | Find Numbers with Even Number of Digits | Easy | C++ | Math | |
| 1299 | Replace Elements with Greatest Element on Right Side | Easy | C++ | Array | |
| 1302 | Deepest Leaves Sum | Medium | C++ | Tree | |
| 1304 | Find N Unique Integers Sum up to Zero | Easy | C++ | Array | |
| 1309 | Decrypt String from Alphabet to Integer Mapping | Easy | C++ | String | |
| 1313 | Decompress Run-Length Encoded List | Easy | C++ | Array | |
| 1315 | Sum of Nodes with Even-Valued Grandparent | Medium | C++ | Tree | |
| 1323 | Maximum 69 Number | Easy | C++ | Math | |
| 1342 | Number of Steps to Reduce a Number to Zero | Easy | C++ | Math | |
| 1351 | Count Negative Numbers in a Sorted Matrix | Easy | C++ | Search | |
| 1365 | How Many Numbers Are Smaller Than The Current Number | Easy | C++ | Array | |
| 1374 | Generate String with Characters That Have Odd Counts | Easy | C++ | String | |
| 1380 | Lucky Numbers in a Matrix | Easy | C++ | Array | |
| 1389 | Create Target Array in the Given Order | Easy | C++ | Array | |
| 1395 | Count Number of Teams | Medium | C++ | Array | |
| 1409 | Queries on a Permutation with Key | Medium | C++ | Array | |
| 1431 | Kids with the Greatest Number of Candies | Easy | C++ | Array | |
| 1436 | Destination City | Easy | C++ | Hash | |
| 1450 | Number of Students Doing Homework at a Given Time | Easy | C++ | Array | |
| 1460 | Make Two Arrays Equal By Reversing Subarrays | Easy | C++ | Hash | |
| 1464 | Maximum Product of Two Elements in an Array | Easy | C++ | Array | |
| 1470 | Shuffle the Array | Easy | C++ | Array | |
| 1476 | Subrectangle Queries | Medium | C++ | Array | |
| 1480 | Running Sum of 1D Array | Easy | C | C++ | Array |
| 1486 | XOR Operation in an Array | Easy | C++ | Bit Manipulation | |
| 1496 | Path Crossing | Easy | C | Linked List | |
| 1512 | Number of Good Pairs | Easy | C | C++ | Array |