Coding Challenges

Practice. Prove. Get Hired. Solve real-world problems and showcase your skills to GCC employers.

243
Challenges
99
Easy
106
Medium
38
Hard

Generate Parentheses

Strings Backtracking
Medium

Rotate Image

Arrays Matrix
Medium

Longest Consecutive Sequence

Arrays Array Hash Table Union Find
Medium

Top K Frequent Elements

Arrays Heap Hash
Medium

Find Minimum in Rotated Array

Arrays Binary Search
Medium

Kth Largest Element

Arrays Heap QuickSelect
Medium

Task Scheduler

Arrays Greedy Heap
Medium

Subarray Sum Equals K

Arrays Prefix Sum Hash
Medium

Binary Tree Level Order

Trees BFS
Medium

Validate BST

Trees DFS Inorder
Medium

BST From Preorder

Trees Stack Recursion
Medium

LRU Cache

Design Hash Map Linked List
Medium

Number of Islands

Graphs DFS BFS
Medium

Course Schedule

Graphs Topological Sort
Medium

Clone Graph

Graphs DFS Hash
Medium

Pacific Atlantic Water Flow

Graphs Array BFS DFS
Medium

Minimum Path Sum

Dynamic Programming Grid DP
Medium

House Robber

Dynamic Programming 1D DP
Medium

Longest Increasing Subsequence

Dynamic Programming Binary Search
Medium

Partition Equal Subset Sum

Dynamic Programming Array Dynamic Programming
Medium

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