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.gitignore
.gitignore
 
 
README.md
README.md
 
 
best_time_to_buy_and_sell_stock.cpp
best_time_to_buy_and_sell_stock.cpp
 
 
best_time_to_buy_and_sell_stock.py
best_time_to_buy_and_sell_stock.py
 
 
best_time_to_buy_and_sell_stock_ii.cpp
best_time_to_buy_and_sell_stock_ii.cpp
 
 
best_time_to_buy_and_sell_stock_ii.py
best_time_to_buy_and_sell_stock_ii.py
 
 
candy.cpp
candy.cpp
 
 
candy.py
candy.py
 
 
container_with_most_water.cpp
container_with_most_water.cpp
 
 
container_with_most_water.py
container_with_most_water.py
 
 
find_the_index_of_the_first_occurrence_in_a_string.cpp
find_the_index_of_the_first_occurrence_in_a_string.cpp
 
 
find_the_index_of_the_first_occurrence_in_a_string.py
find_the_index_of_the_first_occurrence_in_a_string.py
 
 
game_of_life.cpp
game_of_life.cpp
 
 
game_of_life.py
game_of_life.py
 
 
gas_station.cpp
gas_station.cpp
 
 
gas_station.py
gas_station.py
 
 
group_anagrams.cpp
group_anagrams.cpp
 
 
group_anagrams.py
group_anagrams.py
 
 
h_index.cpp
h_index.cpp
 
 
h_index.py
h_index.py
 
 
insert_delete_getrandom_o1.cpp
insert_delete_getrandom_o1.cpp
 
 
insert_delete_getrandom_o1.py
insert_delete_getrandom_o1.py
 
 
integer_to_roman.cpp
integer_to_roman.cpp
 
 
integer_to_roman.py
integer_to_roman.py
 
 
is_subsequence.cpp
is_subsequence.cpp
 
 
is_subsequence.py
is_subsequence.py
 
 
isomorphic_strings.cpp
isomorphic_strings.cpp
 
 
isomorphic_strings.py
isomorphic_strings.py
 
 
jump_game.cpp
jump_game.cpp
 
 
jump_game.py
jump_game.py
 
 
jump_game_ii.cpp
jump_game_ii.cpp
 
 
jump_game_ii.py
jump_game_ii.py
 
 
length_of_last_word.cpp
length_of_last_word.cpp
 
 
length_of_last_word.py
length_of_last_word.py
 
 
longest_common_prefix.cpp
longest_common_prefix.cpp
 
 
longest_common_prefix.py
longest_common_prefix.py
 
 
longest_substring_without_repeating_characters.cpp
longest_substring_without_repeating_characters.cpp
 
 
longest_substring_without_repeating_characters.py
longest_substring_without_repeating_characters.py
 
 
majority_element.cpp
majority_element.cpp
 
 
majority_element.py
majority_element.py
 
 
merge_sorted_array.cpp
merge_sorted_array.cpp
 
 
merge_sorted_array.py
merge_sorted_array.py
 
 
minimum_size_subarray_sum.cpp
minimum_size_subarray_sum.cpp
 
 
minimum_size_subarray_sum.py
minimum_size_subarray_sum.py
 
 
minimum_window_substring.cpp
minimum_window_substring.cpp
 
 
minimum_window_substring.py
minimum_window_substring.py
 
 
product_of_array_except_self.cpp
product_of_array_except_self.cpp
 
 
product_of_array_except_self.py
product_of_array_except_self.py
 
 
ransom_note.cpp
ransom_note.cpp
 
 
ransom_note.py
ransom_note.py
 
 
remove_duplicates_from_sorted_array.cpp
remove_duplicates_from_sorted_array.cpp
 
 
remove_duplicates_from_sorted_array.py
remove_duplicates_from_sorted_array.py
 
 
remove_duplicates_from_sorted_array_ii.cpp
remove_duplicates_from_sorted_array_ii.cpp
 
 
remove_duplicates_from_sorted_array_ii.py
remove_duplicates_from_sorted_array_ii.py
 
 
remove_element.cpp
remove_element.cpp
 
 
remove_element.py
remove_element.py
 
 
reverse_words_in_a_string.cpp
reverse_words_in_a_string.cpp
 
 
reverse_words_in_a_string.py
reverse_words_in_a_string.py
 
 
roman_to_integer.cpp
roman_to_integer.cpp
 
 
roman_to_integer.py
roman_to_integer.py
 
 
rotate_array.cpp
rotate_array.cpp
 
 
rotate_array.py
rotate_array.py
 
 
rotate_image.cpp
rotate_image.cpp
 
 
rotate_image.py
rotate_image.py
 
 
set_matrix_zeroes.cpp
set_matrix_zeroes.cpp
 
 
set_matrix_zeroes.exe
set_matrix_zeroes.exe
 
 
set_matrix_zeroes.py
set_matrix_zeroes.py
 
 
spiral_matrix.cpp
spiral_matrix.cpp
 
 
spiral_matrix.py
spiral_matrix.py
 
 
substring_with_concatenation_of_all_words.cpp
substring_with_concatenation_of_all_words.cpp
 
 
substring_with_concatenation_of_all_words.py
substring_with_concatenation_of_all_words.py
 
 
text_justification.cpp
text_justification.cpp
 
 
text_justification.py
text_justification.py
 
 
three_sum.cpp
three_sum.cpp
 
 
three_sum.py
three_sum.py
 
 
trapping_rain_water.cpp
trapping_rain_water.cpp
 
 
trapping_rain_water.py
trapping_rain_water.py
 
 
two_sum.cpp
two_sum.cpp
 
 
two_sum.py
two_sum.py
 
 
two_sum_ii_input_array_is_sorted.cpp
two_sum_ii_input_array_is_sorted.cpp
 
 
two_sum_ii_input_array_is_sorted.py
two_sum_ii_input_array_is_sorted.py
 
 
valid_anagram.cpp
valid_anagram.cpp
 
 
valid_anagram.py
valid_anagram.py
 
 
valid_palindrome.cpp
valid_palindrome.cpp
 
 
valid_palindrome.py
valid_palindrome.py
 
 
valid_sudoku.cpp
valid_sudoku.cpp
 
 
valid_sudoku.py
valid_sudoku.py
 
 
word_pattern.cpp
word_pattern.cpp
 
 
word_pattern.py
word_pattern.py
 
 
zigzag_conversion.cpp
zigzag_conversion.cpp
 
 
zigzag_conversion.py
zigzag_conversion.py
 
 

Repository files navigation

🚀 LeetCode Top Interview 150 Solutions

LeetCode C++ Python

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

If you find this repository helpful, consider giving it a ⭐!

📄 License

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

Happy Coding! 💻✨

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