#include<stdio.h>//判断是否有环,判断是否有点,判断是否是一个父节点 #include<string.h> #define N 1000000 int pre[N+10],dis[N+10]; int find(int n ) { if(pre[n]!=n) return pre[n]=find(pre[n]); return pre[n]; } int main() { int n,m,i,a,b,j,cnt,flag,f1,f2,k=0,min,max; wh…
数据分割 Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 1119 Accepted Submission(s): 268 Problem Description 小w来到百度之星的赛场上,准备开始实现一个程序自动分析系统. 这个程序接受一些形如xi=xj 或 xi≠xj 的相等/不等约束条件作为输入,判定是否可以通过给每个 w 赋…
Is It A Tree? Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 33083 Accepted Submission(s): 7574 题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=1325 Problem Description A tree is a well-known data…