What is International Olympiad in Informatics?
The International Olympiad in Informatics (IOI) is the world’s most prestigious computer science competition for secondary school students.
Why learn data structures and algorithms?
The IOI is all about data structures and algorithms. Learning data structures and algorithms helps you get better at solving complex problems and win the IOI.
Why you need expert teachers to win the IOI
Teaching data structures and algorithms requires highly specialized skills. All our IOI teachers have extensive experience and are experts in the domain.
Benefits of learning data structures and algorithms
Solve complex programming challenges
Learn to write clean, effective, and highly optimized code
Win coding competitions including the IOI
Start your journey to become a data scientist
Pathway to career in software engineering
Ace interviews with top-notch companies
Master data structures and algorithms
Learn the basics of data structures and algorithms (DSA), master algorithmic programming techniques, and apply your newly-learned skills to win the IOI
What you’ll learn
Algorithms, data structures basics
Numbers and mathematics
Recursion, arrays, graphs
Binary search trees
Searching and sorting algorithms
Backtracking, greedy algorithms
Skills you’ll gain
Algorithmic skills, techniques
Data structure skills, techniques
Competitive coding skills
What you’ll achieve
IOI Algorithms Certification
Python Developer Certification
Coding Champion Certification
Badges and leaderboard rankings
Preparation for competitions
Lifetime community access
Exclusive access to competitions
Activities to master data structures and algorithms
Two odd occurring numbers
If you are given a list of numbers in which all numbers occur at even times except two, write a program to find those two numbers.
Generate all substrings of a given string
Write a program that generates all the possible substrings from any string entered by the user.
Swap two numbers without using third variable
Write a program to swap two numbers without using a third variable using Bitwise operators.
Hear what the winners have to say
I always enjoy Codingal competitions as the increasing difficulty levels as we progress make it so much more exciting.
CodeWars Winner, Grade 11
Codingal gave me the once-in-a-lifetime experience of seeing my code run on the International Space Station.
HPE CodeWars Winner, Grade 10
I won the HPE CodeWars competition and got the opportunity to run an experiment on the ISS thanks to Codingal.
HPE CodeWars Winner, Grade 12
As a student preparing for the IOI, Codingal has helped me greatly improve my problem solving and algorithmic thinking.
Sushil Raaja U
Code Battle #1 Winner, Grade 11
The algorithmic problems in Codingal's competitions are super intriguing and I always get to learn something new.
Code Battle Winner, Grade 11