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Problems

Curated lists

Blind 75
The classic curated list
75 problems
NeetCode 150
The patterns that matter, expanded
150 problems
Follow the roadmap
A pattern-by-pattern plan with a day-by-day schedule
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Topics

Array Backtracking Biconnected Component Binary Indexed Tree Binary Search Binary Search Tree Binary Tree Bit Manipulation Bitmask Brainteaser Breadth-First Search Bucket Sort Combinatorics Concurrency Counting Counting Sort Data Stream Database Depth-First Search Design Divide and Conquer Doubly-Linked List Dynamic Programming Enumeration Eulerian Circuit Game Theory Geometry Graph Greedy Hash Function Hash Table Heap (Priority Queue) Interactive Iterator Line Sweep Linked List Math Matrix Memoization Merge Sort Minimum Spanning Tree Monotonic Queue Monotonic Stack Number Theory Ordered Set Prefix Sum Probability and Statistics Queue Quickselect Radix Sort Randomized Recursion Rejection Sampling Reservoir Sampling Rolling Hash Segment Tree Shell Shortest Path Simulation Sliding Window Sorting Stack String String Matching Strongly Connected Component Suffix Array Topological Sort Tree Trie Two Pointers Union Find

All problems

2837 total
2837 problems
TitleStatusDifficulty
Two Sum—Easy
Add Two Numbers—Medium
Longest Substring Without Repeating Characters—Medium
Median of Two Sorted Arrays—Hard
Longest Palindromic Substring—Medium
Zigzag Conversion—Medium
Reverse Integer—Medium
String to Integer (atoi)—Medium
Palindrome Number—Easy
Regular Expression Matching—Hard
Container With Most Water—Medium
Integer to Roman—Medium
Roman to Integer—Easy
Longest Common Prefix—Easy
3Sum—Medium
3Sum Closest—Medium
Letter Combinations of a Phone Number—Medium
4Sum—Medium
Remove Nth Node From End of List—Medium
Valid Parentheses—Easy
Merge Two Sorted Lists—Easy
Generate Parentheses—Medium
Merge k Sorted Lists—Hard
Swap Nodes in Pairs—Medium
Reverse Nodes in k-Group—Hard
Remove Duplicates from Sorted Array—Easy
Remove Element—Easy
Find the Index of the First Occurrence in a String—Easy
Divide Two Integers—Medium
Substring with Concatenation of All Words—Hard
Next Permutation—Medium
Longest Valid Parentheses—Hard
Search in Rotated Sorted Array—Medium
Find First and Last Position of Element in Sorted Array—Medium
Search Insert Position—Easy
Valid Sudoku—Medium
Sudoku Solver—Hard
Count and Say—Medium
Combination Sum—Medium
Combination Sum II—Medium
First Missing Positive—Hard
Trapping Rain Water—Hard
Multiply Strings—Medium
Wildcard Matching—Hard
Jump Game II—Medium
Permutations—Medium
Permutations II—Medium
Rotate Image—Medium
Group Anagrams—Medium
Pow(x, n)—Medium
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