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I think the problems on codeforces are concise enough.You can see that many Chinese problems have long backgrounds.Maybe they can enhance our interets. e.g.:https://www.luogu.com.cn/problem/P11831 Meanwhile,luogu.com.cn is also a good OJ.You can create an account and enjoy it. My English is too poor.Don't laugh at me please! : ) |
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I think D is harder than E. |
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