SCUT_Pein

Description Bob always plays game with Alice. Today, they are playing a game on a tree. Alice has m1 stones, Bob has m2 stones. At the beginning of the game, all the stones are placed on the nodes

Description To ecient calculate the multiplication of a sparse matrix is very useful in industrial  led. Let's consider this problem: A is an N*N matrix which only contains 0 or 1. And we want t

Description Given an array a[] with N elements,you areasked to perform several operations,each of them is one of the two kinds: 1.      a[i]=j; 2.      calculate sum(a[x]) wherei Input