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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
Widest Gap When Sorted
Array · Bucket Sort · Radix Sort
Medium
Close Readings Nearby
Array · Bucket Sort · Ordered Set
Hard
Most Common Values
Array · Hash Table · Divide and Conquer
Medium
Characters Grouped by Count
Hash Table · String · Bucket Sort
Medium
Most Searched Words
Trie · Array · Hash Table
Medium
Hand-Rolled Sort
Array · Divide and Conquer · Bucket Sort
Medium
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