Question 1

What is CodeArena?

Accepted Answer

CodeArena is the comprehensive platform for coding and AI skills. Practice coding problems and AI prompting, compete in real-time 1v1 battles, build and share challenges, and connect with hiring opportunities. It features ELO rankings, 10 programming languages, weekly challenges, tournaments, AI coaching, and AI Critique assessments.

Question 2

How is CodeArena different from LeetCode?

Accepted Answer

Unlike LeetCode which focuses on solo practice, CodeArena is built for real-time multiplayer competition. Both players see the same problem at the exact same moment and race to submit first. CodeArena features live matchmaking, ELO rankings like chess, anti-cheat monitoring, and the ability to challenge friends directly.

Question 3

Is CodeArena free to use?

Accepted Answer

Yes, CodeArena has a free tier with 3 ranked battles per day, 3 practice problems per day, and access to all 10 programming languages. Pro plan ($9/month) unlocks unlimited battles, AI coaching, and analytics. Students get 45% off with a .edu email.

Question 4

What programming languages does CodeArena support?

Accepted Answer

CodeArena supports 10 programming languages: Python, JavaScript, TypeScript, Java, C, C++, C#, Go, Rust, and SQL. All languages are available in both free and Pro tiers.

Question 5

How does the ELO ranking system work?

Accepted Answer

CodeArena uses ELO ratings like chess. New players start at 1000. Ranks include Bronze (0-999), Silver (1000-1199), Gold (1200-1399), Platinum (1400-1599), Diamond (1600-1799), Master (1800-1999), and Grandmaster (2000+). Win against higher-rated players to climb faster.

Question 6

Can I practice coding alone on CodeArena?

Accepted Answer

Yes, CodeArena offers Practice Mode for solo problem solving. Free users get 3 problems per day, Pro users get unlimited. You can also practice while waiting in the matchmaking queue.

Question 7

Does CodeArena have tournaments?

Accepted Answer

Yes, CodeArena features bracket-style tournaments and weekly challenges with leaderboards. Players compete in elimination rounds, and results affect ELO rankings.

Question 8

How does CodeArena prevent cheating?

Accepted Answer

CodeArena has anti-cheat monitoring including tab switch detection, copy-paste pattern analysis, and behavioral analysis. All code runs in secure sandboxed environments.

Coding Problems

Actors and Directors

Add Binary

Add Digits

Add Strings

Add to Array-Form of Integer

Ads Performance

Array Pair Sum

Array Partition

Article Views I

Assign Cookies

Average of Levels in Binary Tree

Average Salary By Department

Backspace String Compare

Balanced Binary Tree

Base 7

Baseball Game

Best Time to Buy and Sell Stock

Big Countries

Biggest Single Number

Binary Gap

Binary Search

Binary Tree Paths

Binary Watch

Calculate Digit Sum of a String

Calculate Special Bonus

Can Make Arithmetic Progression

Can Make Arithmetic Progression From Sequence

Can Place Flowers

Capitalize the Title

Cells with Odd Values

Check if Array Is Sorted and Rotated

Check If N and Its Double Exist

Check if the Sentence Is Pangram

Check If Two String Arrays are Equivalent

Classes More Than 5 Students

Climbing Stairs

Combine Two Tables

Complement of Base 10 Integer

Construct the Rectangle

Contains Duplicate

Contains Duplicate II

Convert Binary Number in Linked List

Convert Sorted Array to BST

Convert Temperature

Count Asterisks

Count Binary Substrings

Count Divisors

Count Elements With Strictly Smaller and Greater Elements

Count Employees Per Department

Count Equal and Divisible Pairs