题意很容易理解;; //强连通是任意两点都能到达,双向的。 #include"stdio.h" int pre[100001]; int find(int k) { if(k!=pre[k]) pre[k]=find(pre[k]); return pre[k]; } int main() { int n,m,i,a,b; while(sca
迷宫城堡 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 8196 Accepted Submission(s): 3664 Problem Description 为了训练小希的方向感,Gardon建立了
mysql> revoke all privileges,grant option from 'testuser'; ERROR 1269 (HY000): Can't revoke all privileges for one or more of the requested users 出错原因: Before MySQL 4.1.2, all privileges cannot
Problem Description 为了训练小希的方向感,Gardon建立了一座大城堡,里面有N个房间(N<=10000)和M条通道(M<=100000),每个通道都是单向的,就是说若称某通道连通了A房间和B房间,只说明可以通过这个通道由A房间到达B房间,但并不说明通过它可以由B房间到达A房间。Gardon需要请你写个程序确认一下是否任意两个房间都是相互连通的,即:对于任意的i和j,至少存在一
题目: We all know that a pair of distinct points on a plane defines a line and that a pair of lines on a plane will intersect in one of three ways: 1) no intersection because they are parallel, 2) inte