🚀 LeetCode Top Interview 150 Solutions

Daily solutions to LeetCode's Top Interview 150 problems in C++ and Python

📖 About

This repository contains my solutions to the LeetCode Top Interview 150 problems. The Top Interview 150 is a curated list of essential coding problems that cover the most common topics asked in technical interviews at top tech companies.

Goal: Solve all 150 problems and build a comprehensive reference for interview preparation.

🎯 Progress

• Total Problems: 150
• Solved: 44
• In Progress: 106
• Last Updated: February 27, 2026

🗂️ Repository Structure

.
├── README.md
├── problem_name.cpp       # C++ solution
└── problem_name.py        # Python solution

Each problem includes clean code in both C++ and Python

📚 Problem Categories

The Top Interview 150 covers these key topics:

• Array / String
• Two Pointers
• Sliding Window
• Matrix
• Hashmap
• Intervals
• Stack
• Linked List
• Binary Tree General
• Binary Tree BFS
• Binary Search Tree
• Graph General
• Graph BFS
• Trie
• Backtracking
• Divide & Conquer
• Kadane's Algorithm
• Binary Search
• Heap
• Bit Manipulation
• Math
• 1D DP
• Multidimensional DP

✅ Solved Problems

#	Problem	Difficulty	C++	Python	Topics
1	Two Sum	Easy	✓	✓	Array, Hash Table
3	Longest Substring Without Repeating Characters	Medium	✓	✓	Hash Table, String, Sliding Window
6	Zigzag Conversion	Medium	✓	✓	String
11	Container With Most Water	Medium	✓	✓	Array, Two Pointers, Greedy
12	Integer to Roman	Medium	✓	✓	Hash Table, Math, String
13	Roman to Integer	Easy	✓	✓	Hash Table, Math, String
14	Longest Common Prefix	Easy	✓	✓	String
15	3Sum	Medium	✓	✓	Array, Two Pointers, Sorting
26	Remove Duplicates from Sorted Array	Easy	✓	✓	Array, Two Pointers
27	Remove Element	Easy	✓	✓	Array, Two Pointers
28	Find the Index of the First Occurrence in a String	Easy	✓	✓	Two Pointers, String, String Matching
30	Substring with Concatenation of All Words	Hard	✓	✓	Hash Table, String, Sliding Window
36	Valid Sudoku	Medium	✓	✓	Array, Hash Table, Matrix
42	Trapping Rain Water	Hard	✓	✓	Array, Two Pointers, Dynamic Programming, Stack
45	Jump Game II	Medium	✓	✓	Array, Greedy, Dynamic Programming
48	Rotate Image	Medium	✓	✓	Array, Math, Matrix
49	Group Anagrams	Medium	✓	✓	Array, Hash Table, String, Sorting
54	Spiral Matrix	Medium	✓	✓	Array, Matrix, Simulation
55	Jump Game	Medium	✓	✓	Array, Greedy, Dynamic Programming
58	Length of Last Word	Easy	✓	✓	String
68	Text Justification	Hard	✓	✓	Array, String, Simulation
73	Set Matrix Zeroes	Medium	✓	✓	Array, Hash Table, Matrix
76	Minimum Window Substring	Hard	✓	✓	Hash Table, String, Sliding Window
80	Remove Duplicates from Sorted Array II	Medium	✓	✓	Array, Two Pointers
88	Merge Sorted Array	Easy	✓	✓	Array, Two Pointers
121	Best Time to Buy and Sell Stock	Easy	✓	✓	Array, Dynamic Programming
122	Best Time to Buy and Sell Stock II	Medium	✓	✓	Array, Greedy, Dynamic Programming
125	Valid Palindrome	Easy	✓	✓	Two Pointers, String
134	Gas Station	Medium	✓	✓	Array, Greedy
135	Candy	Hard	✓	✓	Array, Greedy
151	Reverse Words in a String	Medium	✓	✓	Two Pointers, String
167	Two Sum II - Input Array Is Sorted	Medium	✓	✓	Array, Two Pointers, Binary Search
169	Majority Element	Easy	✓	✓	Array, Hash Table, Divide and Conquer
189	Rotate Array	Medium	✓	✓	Array, Math, Two Pointers
205	Isomorphic Strings	Easy	✓	✓	Hash Table, String
209	Minimum Size Subarray Sum	Medium	✓	✓	Array, Binary Search, Sliding Window, Prefix Sum
238	Product of Array Except Self	Medium	✓	✓	Array, Prefix Sum
242	Valid Anagram	Easy	✓	✓	Hash Table, String, Sorting
274	H-Index	Medium	✓	✓	Array, Sorting, Counting Sort
289	Game of Life	Medium	✓	✓	Array, Matrix, Simulation
290	Word Pattern	Easy	✓	✓	Hash Table, String
380	Insert Delete GetRandom O(1)	Medium	✓	✓	Array, Hash Table, Design
383	Ransom Note	Easy	✓	✓	Hash Table, String, Counting
392	Is Subsequence	Easy	✓	✓	Two Pointers, String, Dynamic Programming

🛠️ Languages & Tools

• C++: Modern C++ (C++17/20) with STL
• Python: Python 3.x with clear, pythonic solutions

📫 Connect

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📄 License

This project is open source and available under the MIT License.

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Happy Coding! 💻✨