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Problem Description 对于一个串S，当它同时满足如下条件时，它就是一个01偏串： 1、只由0和1两种符组成； 2、在S的每一个前缀中，0的个数不超过1的个数； 3、S中0的个数和1的个数相等。 现在给定01偏串S，请计算一下S在所有长度为n的01偏串中作为子串出现的次数的总和。 由 阅读全文
posted @ 2017-08-06 22:59
樱花落舞
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度度熊的王国战略 度度熊的王国战略 度度熊国王率领着喵哈哈族的勇士，准备进攻哗啦啦族。 哗啦啦族是一个强悍的民族，里面有充满智慧的谋士，拥有无穷力量的战士。 所以这一场战争，将会十分艰难。 为了更好的进攻哗啦啦族，度度熊决定首先应该从内部瓦解哗啦啦族。 第一步就是应该使得哗啦啦族内部不能同心齐力，需 阅读全文
posted @ 2017-08-05 17:05
樱花落舞
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The organizers of a programming contest have decided to present t-shirts to participants. There are six different t-shirts sizes in this problem: S,M, 阅读全文
posted @ 2017-07-26 23:15
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This is an interactive problem. You should use flush operation after each printed line. For example, in C++ you should usefflush(stdout), in Java you 阅读全文
posted @ 2017-07-26 23:04
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Vasily exited from a store and now he wants to recheck the total price of all purchases in his bill. The bill is a string in which the names of the pu 阅读全文
posted @ 2017-07-26 22:53
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Vasily has a number a, which he wants to turn into a number b. For this purpose, he can do two types of operations: multiply the current number by 2 ( 阅读全文
posted @ 2017-07-26 22:44
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Mahmoud and Ehab live in a country with n cities numbered from 1 to n and connected by n - 1 undirected roads. It's guaranteed that you can reach any 阅读全文
posted @ 2017-07-26 01:43
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Mahmoud wants to write a new dictionary that contains n words and relations between them. There are two types of relations: synonymy (i. e. the two wo 阅读全文
posted @ 2017-07-26 01:32
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Mahmoud wrote a message s of length n. He wants to send it as a birthday present to his friend Moaz who likes strings. He wrote it on a magical paper 阅读全文
posted @ 2017-07-26 01:22
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