ACM,再见！

http://acdream.info/problem?pid=1116Problem Descriptiongive you a string, please output the result of the following function mod 1000000007n is the length of the stringf() is the funct

http://acdream.info/problem?pid=1019Problem DescriptionNow we have a long long string, and we will have two kinds of operation on it.C i y : change the ith letter to y.Q i j : check whet

http://acm.hust.edu.cn/vjudge/contest/view.action?cid=81769#problem/E/**UVALive 6665 最短路题目大意：给定一个3*3的棋盘，里面有8个现有的棋子，然后移动棋子，从初始状态到目标状态最少花费是多少？解题思路：这个题用bfs+康托展开写的结果超时，后来从网上学了一个最短路的写法，速度很快。每种状态压缩成一个

http://acdream.info/problem?pid=1726Problem DescriptionRecently, Losanto find an interesting Math game. The rule is simple: Tell you a number H, and you can choose some numbers from a set {a

http://acm.hdu.edu.cn/showproblem.php?pid=5183Problem DescriptionWhen given an array (a0,a1,a2,⋯an−1) and an integer K, you are expected to judge whether there is a pair (i,j)(0≤i≤jn) wh

http://acm.hdu.edu.cn/showproblem.php?pid=4821Problem DescriptionGiven a string S and two integers L and M, we consider a substring of S as “recoverable” if and only if  (i) It is of l

http://poj.org/problem?id=1840DescriptionConsider equations having the following form: a1x13+ a2x23+ a3x33+ a4x43+ a5x53=0 The coefficients are given integers from the interval [-50,50]. 

http://poj.org/problem?id=3349DescriptionYou may have heard that no two snowflakes are alike. Your task is to write a program to determine whether this is really true. Your program will read i

http://poj.org/problem?id=1200DescriptionMany people like to solve hard puzzles some of which may lead them to madness. One such puzzle could be finding a hidden prime number in a given text.

http://acm.hdu.edu.cn/showproblem.php?pid=1496Problem DescriptionConsider equations having the following form: a*x1^2+b*x2^2+c*x3^2+d*x4^2=0a, b, c, d are integers from the interval [-

http://poj.org/problem?id=3274DescriptionFarmer John's N cows (1 ≤ N ≤ 100,000) share many similarities. In fact, FJ has been able to narrow down the list of features shared by his cows to a l

https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=&problem=2514&mosmsg=Submission+received+with+ID+1623942Dr. Ellie Arroway has established cont

http://acm.hdu.edu.cn/showproblem.php?pid=3973Problem DescriptionYou are given some words {Wi}. Then our stupid AC will give you a very long string S. AC is stupid and always wants to know w