常用算法编程题目学习与训练的网站

列出一些用于算法题目学习与训练的网站：

UVA Online Judge： https://onlinejudge.org/

Sphere Online Judge: https://www.spoj.com/

Coderbyte: https://www.coderbyte.com/

Project Euler: http://projecteuler.com/

HackerRank: https://www.hackerrank.com/

CodeChef: https://www.codechef.com/

Top Coder: https://www.topcoder.com/

freeCodeCamp: https://www.freecodecamp.cn/

leetcode:https://leetcode-cn.com/