- LeetCode #1 Two Sum
- LeetCode #2: Add Two Numbers
- LeetCode #3: Longest Substring Without Repeating Characters
- LeetCode #4: Median of Two Sorted Arrays
- LeetCode #5: Longest Palindromic Substring
- LeetCode #8: String to Integer (atoi)
- LeetCode #9: Palindrome Number
- LeetCode #11: Container With Most Water
- LeetCode #13: Roman to Integer
- LeetCode #14: Longest Common Prefix
- LeetCode #20: Valid Parentheses
- LeetCode #21: Merge Two Sorted Lists
- LeetCode #22: Generate Parentheses
- LeetCode #23: Merge k Sorted Lists
- LeetCode #36: Valid Sudoku
- LeetCode #37. Sudoku Solver
- LeetCode #42: Trapping Rain Water
- LeetCode #46: Permutations
- LeetCode #71: Simplify Path
- LeetCode #98: Validate Binary Search Tree
- LeetCode #101: Symmetric Tree
- LeetCode #128: Longest Consecutive Sequence
- LeetCode #150: Evaluate Reverse Polish Notation
- LeetCode #205: Isomorphic Strings
- LeetCode #208: Implement Trie (Prefix Tree)
- LeetCode #232: Implement Queue using Stacks
- LeetCode #242: Valid Anagram
- LeetCode #258: Add Digits
- LeetCode #284: Peeking Iterator
- LeetCode #287: Find the Duplicate Number
- LeetCode #303: Range Sum Query - Immutable
- LeetCode #304: Range Sum Query 2D - Immutable
- LeetCode #344: Reverse String
- LeetCode #345: Reverse Vowels of a String
- LeetCode #355: Design Twitter
- LeetCode #502: IPO
- LeetCode #509: Fibonacci Number
- LeetCode #958: Check Completeness of a Binary Tree
- LeetCode #1122: Relative Sort Array
- LeetCode #1146: Snapshot Array
- LeetCode #1572: Matrix Diagonal Sum
- LeetCode #1603. Design Parking System
- LeetCode #2108: Find First Palindromic String in the Array
- LeetCode #2133: Check if Every Row and Column Contains All Numbers
- LeetCode #2283: Check if Number Has Equal Digit Count and Digit Value
- LeetCode #2309: Greatest English Letter in Upper and Lower Case
- LeetCode #2319: Check if Matrix Is X-Matrix
- LeetCode #2336: Smallest Number in Infinite Set
- LeetCode #2404: Most Frequent Even Element
- LeetCode #3005: Count Elements With Maximum Frequency