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You have a string s = s1s2...s|s|, where |s| is the length of string s, and si its i-th character.Let's introduce several definitions:A substring s[i.... 阅读全文
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Zeus 和 Prometheus 做了一个游戏,Prometheus 给 Zeus 一个集合,集合中包含了N个正整数,随后 Prometheus 将向 Zeus 发起M次询问,每次询问中包含一个正整数 S ,之后 Zeus 需要在集合当中找出一个正整数 K ,使得 K 与 S 的异... 阅读全文
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In ACM/ICPC contest, the ”Dirt Ratio” of a team is calculated in the following way. First let’s ignore all the problems the team didn’t pass, ... 阅读全文
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HDU1695的题目大意是这样的,给你 a , b , c , d , k 五个值 (题目说明了 你可以认为 a=c=1) x 属于 [1,b] ,y属于[1,d] 让你求有多少对这样的 (x,y)满足gcd(x,y)==k。这一题和hdu 6053不一样的地方在于,在hdu60... 阅读全文
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Mr. Frog has an integer sequence of length n, which can be denoted as a1,a2,⋯,ana1,a2,⋯,anThere are m queries. In the i-th query, you are given two in... 阅读全文