| 0344 | Reverse String LeetCode XXXX Two Pointers, String | Easy | | |
| 0024 | Swap Nodes in Pairs LeetCode XXXX Recursion, Linked List | Medium | | |
| 0118 | Pascal’s Triangle LeetCode XXXX Array, Dynamic Programming | Easy | | |
| 0119 | Pascal’s Triangle II LeetCode XXXX Array, Dynamic Programming | Easy | | |
| 0206 | Reverse Linked List LeetCode XXXX Recursion, Linked List | Easy | | |
| 0092 | Reverse Linked List II LeetCode XXXX Linked List | Medium | | |
| 0021 | Merge Two Sorted Lists LeetCode XXXX Recursion, Linked List | Easy | | |
| 0509 | Fibonacci Number LeetCode XXXX Recursion, Memoization, Math, Dynamic Programming | Easy | | |
| 0070 | Climbing Stairs LeetCode XXXX Memoization, Math, Dynamic Programming | Easy | | |
| 0104 | Maximum Depth of Binary Tree LeetCode XXXX Tree, Depth-First Search, Breadth-First Search, Binary Tree | Easy | | |
| 0124 | Binary Tree Maximum Path Sum LeetCode XXXX Tree, Depth-First Search, Dynamic Programming, Binary Tree | Hard | | |
| 0226 | Invert Binary Tree LeetCode XXXX Tree, Depth-First Search, Breadth-First Search, Binary Tree | Easy | | |
| 0050 | Pow(x, n) LeetCode XXXX Recursion, Math | Medium | | |
| 0779 | K-th Symbol in Grammar LeetCode XXXX Bit Manipulation, Recursion, Math | Medium | | |
| 0095 | Unique Binary Search Trees II LeetCode XXXX Tree, Binary Search Tree, Dynamic Programming, Backtracking, Binary Tree | Medium | | |