[bzoj2818]Gcd
Description给定整数N，求1<=x,y<=N且Gcd(x,y)为素数的数对(x,y)有多少对.
Input一个整数N
Output如题
Sample Input4
Sample
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[HDU1423] Greatest Common Increasing Subsequence
DescriptionYou are given two sequences of integer numbers. Write a program to determine their common
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[poj 2762]Going from u to v or from v to u?
DescriptionIn order to make their sons brave, Jiajia and Wind take them to a big cave. The cave has
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[OpenJudge 2405]Avoid The Lakes
描述Farmer John’s farm was flooded in the most recent storm, a fact only aggravated by the information
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[NOIP2015神奇五校模拟赛No.7]设置(settings)
题目描述如题所示，这将是一个关于设置的问题。你需要通过对一个控制台进行设置，来得到不同的效果。这个控制台由n个控制元件组成，每个元件有m种设置，其中i号元件的第j种设置将会给整体带来a[i][j]的效
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[poj 2348]Euclid's Game
描述Two players, Stan and Ollie, play, starting with two natural numbers. Stan, the first player, subt
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poj 2157 Maze
Time Limit: 2000MS Memory Limit: 65536KTotal Submissions: 3695 Accepted: 1153
Descript
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BZOJ4300: 绝世好题
Description给定一个长度为n的数列ai，求ai的子序列bi的最长长度，满足bi&bi-1!=0(2<=i<=len)。
Input输入文件共2行。第一行包括一个整数n。第
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[codevs4438] YJQ Runs Upstairs #patina27大战玄学#
题目本身是好题
题目描述 Description学校科技楼一共有N层,而神犇YJQ每天都在科技楼N楼的机房写代码。这天,他准备从科技楼1楼爬到N楼。有个M连接不同楼层的楼梯,爬每个楼梯需要一定的体力值
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[poj 2479]Maximum sum
DescriptionGiven a set of n integers: A={a1, a2,…, an}, we define a function d(A) as below:(图丢了)Your
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