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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
An Author's Impact Score
Array · Counting Sort · Sorting
Medium
Strength of the Weaker Partner
Greedy · Array · Counting Sort
Easy
Hand-Rolled Sort
Array · Divide and Conquer · Bucket Sort
Medium
Out of Place in the Line
Array · Counting Sort · Sorting
Easy
Sort by a Reference Order
Array · Hash Table · Counting Sort
Easy
How Many Are Smaller
Array · Hash Table · Counting Sort
Easy
Most Snacks on a Budget
Greedy · Array · Counting Sort
Medium
Scooters to Chargers
Greedy · Array · Counting Sort
Easy
No Letter Facing Its Twin
Greedy · String · Counting Sort
Hard
One Rook per Line
Greedy · Array · Counting Sort
Medium
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