Competitive Programming

Practice

• HackerRank has lots of easy problems
• Advent of Code Fun problems, new competition starts December 1st
• Project Euler has difficult problems

Competition practice problems

• Kattis
• Uva Online Judge

Books

• Competitive Programming Book

Courses

• Competitive Programming Core Skills on Coursera created by Saint Petersburg State University
• Computer Algorithms on Khan Academy created by Dartmouth college.