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String Transformation 1 题目链接:Codeforces Round #659(div2) C.String Transformation 1 题目描述 Koa the Koala has two strings A and B of the same length n (|A 阅读全文
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Harder Gcd Problem 题目描述 After solving the Basic Gcd Problem, ZYB gives you a more difficult one: Given an integer n, find two subset A and B of {1,2,. 阅读全文
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Mahmoud and a Message 题目链接: Codeforces Round #396 (Div. 2) C. Mahmoud and a Message 题目描述 Mahmoud wrote a message s of length n. He wants to send it as 阅读全文
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Friends ====== 题目描述 给定一个字符串S,先将字符串S复制一次(变成双倍快乐),得到字符串T,然后在T中插入一个字符,得到字符串U。 给出字符串U,重新构造出字符串S。 所有字符串只包含大写英文字母。 输入描述 第一行一个整数N,表示字符串U的长度。 N include using 阅读全文