12 sites para praticar programação

1- codewars.com
2- leetcode.com
3- hackerrank.com
4- topcoder.com
5- exercism.org
6- coderbyte.com
7- codingame.com
8- codechef.com
9- w3schools.com
10- edabit.com
11- codeforces.com
12- hackerearth.com