Problems in Codeforces.com

Updated 2026-06-06 12:13 GMT+8Compiled by Hongfei Yan (2020 Fall)

Basic 题目难度是 800~1100，Optional 题目难度 1200+

How to find the problems? Visit http://codeforces.com/, click 'PROBLEMSET', then click green checkmark (order=BY_SOLVED_DESC). That is, click http://codeforces.com/problemset?order=BY_SOLVED_DESC.

What is Codeforces? What kind of a site/resource is it? Codeforces is a project joining people interested in and taking part in programming contests. On one hand, Codeforces is a social network dedicated to programming and programming contests. On the other hand, it is a platform where contests are held regularly, the participant's skills are reflected by their rating and the former contests can be used to prepare.

如果想查看某个题目的测试数据（往年可以看到其他人提交的代码，2024 年 10 月被屏蔽了，2025 年 9 月解封了），替换链接中数字和最后一个字母，例如查看 580C 可以访问 https://codeforces.com/problemset/status/580/problem/C

Codeforces 题目是英文，洛谷提供中文。方法是拿到 CF 题号，如：1749C，直接编辑这个链接的相应题号位置： https://www.luogu.com.cn/problem/CF1749C