Tutorials

To use Python in competitive programming, you will have to know how to take input from stdin.

If you are given a number N, you have to determine how many integers between 1 and N have a GCD of 1 with N.

Finding a number in a sorted array using binary search.

A beginner's number theory tutorial on Sieve of Eratosthenes.

Learn how to use faster I/O methods in sport programming.