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Sharpen your skills with curated problems, filtered by topic, company and difficulty.

5 problems

Linked List
Easy

Reverse a Linked List

Reverse a singly linked list and return the new head.

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Arrays
Medium

Kadane's Algorithm

Find the contiguous subarray with the maximum sum.

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Graph
Medium

Detect Cycle in an Undirected Graph

Check whether an undirected graph contains a cycle.

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Tree
Hard

Binary Tree to DLL

Convert a binary tree to a doubly linked list in-place.

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Arrays
Easy

Missing Number in Array

Find the missing number from 1..n.

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Storage details