http://www.codeabbey.com/ http://www.codeabbey.com/ is more CpSc oriented but very similar to https://projecteuler.net/ https://projecteuler.net/. https://uva.

http://www.codeabbey.com/ http://www.codeabbey.com/ is more CpSc oriented but very similar to https://projecteuler.net/ https://projecteuler.net/. https://uva.onlinejudge.org/ https://uva.onlinejudge.org/ has too many problems to sum up easily, but they have online solution checking. http://acm.timus.ru/ http://acm.timus.ru/ and http://www.spoj.com/ http://www.spoj.com/ are similarly massive.