알고스팟
https://algospot.com/
더블릿
http://www.dovelet.com
Colility
https://codility.com/programmers/lessons/1-iterations/
개발자 알고리즘 테스트할 때도 쓰는 사이트
코딩도장
http://codingdojang.com/
오일러 프로젝트(Project Euiler)
https://projecteuler.net/
http://euler.synap.co.kr/
LeetCode
https://leetcode.com/problemset/algorithms/
기타
백준 https://www.acmicpc.net/
http://www.koistudy.net/
http://jungol.co.kr/
http://www.koreaalgorithm.com/
http://poj.org/
http://exercism.io
https://www.4clojure.com/