Community challenges

The problem library

Pick a challenge, write your solution and let the AI judge it in real time.

27 problems

Filtering byTwo Pointers

Medium

Sort Colors

ArrayTwo Pointers+1

Code MasterSolve

Medium

Find the Duplicate Number

ArrayTwo Pointers+1

Code MasterSolve

Easy

Pair Sums

Hash TableArray+1

Code MasterSolve

Easy

Reverse Array in Place

Two PointersArray

Code MasterSolve

Medium

Longest Substring with At Most K Distinct Characters

Sliding WindowHash Table+2

Code MasterSolve

Easy

Check if Array is a Mountain

ArrayTwo Pointers

Code MasterSolve

Easy

Merge Sorted Arrays

Two PointersArray+1

Code MasterSolve

Easy

Reverse Words in a Sentence

Two PointersString

Code MasterSolve

Medium

Reverse Vowels of a String

Two PointersString

Code MasterSolve

Medium

Shift String by K Chunks

StringTwo Pointers+1

Code MasterSolve

Medium

Count Triplets in Array

ArrayTwo Pointers+1

Code MasterSolve

Easy

Binary Representation Palindrome

Bit ManipulationTwo Pointers+1

Code MasterSolve

The problem library

Problems