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Coding problems
Algorithm problems with tests in Python, JavaScript, Java, Go and C++, checked on our server.
Any difficulty
Easy
Medium
Hard
Array
1760
String
729
Hash Table
585
Dynamic Programming
558
Math
526
Sorting
432
Greedy
398
Binary Search
270
Depth-First Search
262
Matrix
239
Bit Manipulation
223
Breadth-First Search
207
Two Pointers
200
Prefix Sum
189
Tree
186
Heap (Priority Queue)
167
Simulation
163
Graph
152
43 more
Longest Repeated Fragment
String · Binary Search · Suffix Array
Hard
Longest Piece Seen Twice
String · Binary Search · Dynamic Programming
Medium
Counting Distinct Substrings
Trie · String · Suffix Array
Medium
Longest Shared Route Segment
Array · Binary Search · Suffix Array
Hard
A List Without Commas
String · Dynamic Programming · Suffix Array
Hard
Suffixes Echoing the Start
String · Binary Search · String Matching
Hard
Cheapest Build From Pieces
Array · String · Dynamic Programming
Hard
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