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Discription Consider a sequence F i that satisfies the following conditions:  Find the number of different divisors of F n. Input Input file contains the only integer number n (1 ≤ n ≤ 10 6). Output Output the answer modulo 10 9 + 7. Example Input: 3…
http://poj.org/problem?id=1860 题意:汇率转换,与之前的2240有点类似,不同的是那个题它去换钱的时候,是不需要手续费的,这个题是需要手续费的,这是个很大的不同. 思路:还是转换成为最短路的问题,主要的困难也就是关于它的松弛方程.dist [edge[i].v] < (dist[ tmp ] - edge[ i ].r) * edge[ i ].c  .这个就是松弛方程,当它的钱的数目增多的时候松弛. #include <stdio.h> #include…
题目链接 题意:求给定的字符串的最长回文子串 分析:做法是构造一个新的字符串是原字符串+反转后的原字符串(这样方便求两边回文的后缀的最长前缀),即newS = S + '$' + revS,枚举回文串中心位置,RMQ询问LCP = min (height[rank[l]+1] to height[rank[r]]),注意的是RMQ传入参数最好是后缀的位置,因为它们在树上的顺序未知,且左边还要+1. #include <cstdio> #include <algorithm> #in…
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2068. Game of Nuts Time limit: 1.0 secondMemory limit: 64 MB The war for Westeros is still in process, manpower and supplies are coming to an end and the winter is as near as never before. The game of thrones is unpredictable so Daenerys and Stannis…
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