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  • Overview
  • Your First Problem
  • Basic Problems
  • Where to Go Next
8 Problems

TheOA HelperBeginner's Guide

Welcome! This guide will help you become familiar with the platform and build confidence solving coding problems — from your very first submission to tackling real interview questions.

Beginner FriendlyStart from zero
3 LanguagesPython, C++, Java
Instant FeedbackRun & test in-browser

Through this guide, you will:

Learn the problem-solving workflow
Get familiar with the code editor
Solve beginner-friendly problems
Discover what to tackle next

Solving Your First Problem

Follow these steps to solve your first coding problem in the app.

Step 1

Read the Problem

Understand what the problem is asking. Pay attention to input format, output format, and constraints.

Step 2

Study the Examples

Look at the sample test cases. Trace through them by hand to make sure you understand the expected behavior.

Step 3

Write Your Code

Use the code editor to write your solution. Choose your preferred language from the dropdown.

Step 4

Run & Test

Click "Run" to test your code against the sample cases. Fix any issues until all test cases pass.

Step 5

Submit

Once all visible test cases pass, submit your solution. Hidden test cases will also be evaluated.

Ready? Try your first problem

Start with the easiest problem in the guide. No experience required.

#1

Find Maximum in Array

easyScore: 5
Array

Basic Problems

Work through these beginner-friendly problems. They are ordered by difficulty — start from the top and work your way down.

Your Progress
0 / 8 completed
#1

Find Maximum in Array

easyScore: 5
Array
#2

Even or Odd

easyScore: 5
Math
#3

FizzBuzz

easyScore: 10
MathString
#4

Reverse String

easyScore: 10
Two PointersString
#5

Count Vowels

easyScore: 10
String
#6

Sum of Digits

easyScore: 10
Math
#7

Palindrome Check

easyScore: 15
Two PointersString
#8

Two Sum

easyScore: 15
ArrayHash Table

Where to Go Next

Now that you've got the basics down, explore more of what the platform has to offer.

Explore Problems

Browse all coding problems by topic, difficulty, and company.

Explore

DSA Sheet

60 curated OA-style problems covering essential patterns.

Explore

SQL Practice

Sharpen your database skills with real OA SQL questions.

Explore

Keep practicing and you'll be ready for any online assessment.