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  Bubble Sort HDU - 5775         P is a permutation of the integers from 1 to N(index starting from 1). Here is the code of Bubble Sort in C++. for(int i=1;i<=N;++i) for(int j=N,t;j&g...

Weak Pair HDU - 5877 You are given a rooted tree of N nodes, labeled from 1 to N. To the ith node a non-negative value ai is assigned.An ordered pair of nodes (u,v) is said to be weak if (1) u is ...

Different GCD Subarray Query HDU - 5869 This is a simple problem. The teacher gives Bob a list of problems about GCD (Greatest Common Divisor). After studying some of them, Bob thinks that GCD is so ...

Ryuji doesn’t want to study （树状数组） Ryuji is not a good student, and he doesn’t want to study. But there are n books he should learn, each book has its knowledge a[i]a[i]a[i]. Unfortunately, the long...