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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
City Block Outline
Binary Indexed Tree · Segment Tree · Array
Hard
Tiles That Form a Rectangle
Array · Line Sweep
Hard
Area Covered by Overlapping Rectangles
Segment Tree · Array · Ordered Set
Hard
Overlap of Two Schedules
Array · Two Pointers · Line Sweep
Medium
The Narrowest Range Around Each Point
Array · Binary Search · Sorting
Hard
Halve the Covered Area
Segment Tree · Array · Binary Search
Hard
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