- 🟢 Two Sum (Easy)
- 🟢 Contains Duplicate (Easy)
- 🟢 Valid Anagram (Easy)
- 🟡 Group Anagrams (Medium)
- 🟡 Top K Frequent Elements (Medium)
- 🟡 Product of Array Except Self (Medium)
- 🟢 Valid Palindrome (Easy)
- 🟢 Two Sum II - Input Array Is Sorted (Easy)
- 🟡 3Sum (Medium)
- 🟡 Container With Most Water (Medium)
- 🟡 Longest Substring Without Repeating Characters (Medium)
- 🔴 Minimum Window Substring (Hard)
- 🟢 Valid Parentheses (Easy)
- 🟡 Min Stack (Medium)
- 🟡 Daily Temperatures (Medium)
- 🟢 Binary Search (Easy)
- 🟢 Search Insert Position (Easy)
- 🟡 Search in Rotated Sorted Array (Medium)
- 🟢 Reverse Linked List (Easy)
- 🟢 Merge Two Sorted Lists (Easy)
- 🟢 Linked List Cycle (Easy)
- 🟡 Reorder List (Medium)
- 🟢 Maximum Depth of Binary Tree (Easy)
- 🟢 Invert Binary Tree (Easy)
- 🟢 Same Tree (Easy)
- 🟢 Subtree of Another Tree (Easy)
- 🟡 Binary Tree Level Order Traversal (Medium)
- 🟢 Climbing Stairs (Easy)
- 🟡 House Robber (Medium)
- 🟡 Longest Palindromic Substring (Medium)