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链接： https://codeforces.com/gym/102394/problem/J 题意： The great mathematician DreamGrid proposes a conjecture, which states that: Every positive integer 阅读全文
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链接: https://codeforces.com/gym/102394/problem/I 题意： DreamGrid has an interesting permutation of 1,2,…,n denoted by a1,a2,…,an. He generates three sequ 阅读全文
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链接： https://codeforces.com/gym/102394/problem/F 题意： Harbin, whose name was originally a Manchu word meaning "a place for drying fishing nets", grew fr 阅读全文
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链接： https://codeforces.com/contest/1245/problem/D 题意： Shichikuji is the new resident deity of the South Black Snail Temple. Her first job is as follow 阅读全文
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链接： https://codeforces.com/contest/1245/problem/C 题意： Constanze is the smartest girl in her village but she has bad eyesight. One day, she was able to 阅读全文
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链接： https://codeforces.com/contest/1245/problem/B 题意： Let n be a positive integer. Let a,b,c be nonnegative integers such that a+b+c=n. Alice and Bob 阅读全文
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链接： https://codeforces.com/contest/1245/problem/A 题意： Consider the set of all nonnegative integers: 0,1,2,…. Given two integers a and b (1≤a,b≤104). W 阅读全文