Problem Description Mr Wang wants some boys to help him with a project. Because the project is rather complex, the more boys come, the better it will be. Of course there are certain requirements. Mr Wang selected a room big enough to hold the boys. T…

并查集   英文:Disjoint Set,即“不相交集合” 将编号分别为1…N的N个对象划分为不相交集合, 在每个集合中,选择其中某个元素代表所在集合. 常见两种操作: n       合并两个集合 n       查找某元素属于哪个集合 并查集实现的程序代码: int set[MAXN],rank[MAXN]; //set[i]=k表示i的父节点是k,rank[]存储树的深度. int FindSet(int x) { if(set[x]!=x) set[x]=FindSet(set[x])…

#include<cstdio> #include<cstdlib> typedef struct ufse *ufset; struct ufse { ]; ]; }UFS; int max; int find(int e,ufset u) { if(e!=u->parent[e]) u->parent[e]=find(u->parent[e],u);//递归缩短路径 return u->parent[e]; } void ufnion(int i,int…

转自:wutianqi http://www.wutianqi.com/?p=1069 tag:并查集 #include <iostream> using namespace std; #define MAX 10000001 // father[x]表示x的父节点 int father[MAX]; // rank[x]表示x的秩 int rank[MAX]; // 初始化 void Make_Set(int n) { ; i<=n; ++i) { father[i] = i; rank…

More is better Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 327680/102400 K (Java/Others)Total Submission(s): 17683    Accepted Submission(s): 6493 Problem Description Mr Wang wants some boys to help him with a project. Because the project…

Problem Description Stan and Ollie play the game of multiplication by multiplying an integer p by one of the numbers 2 to 9. Stan always starts with p = 1, does his multiplication, then Ollie multiplies the number, then Stan and so on. Before a game…

Problem Description There are a lot of trees in an area. A peasant wants to buy a rope to surround all these trees. So at first he must know the minimal required length of the rope. However, he does not know how to calculate it. Can you help him? The…

Problem Description There are many secret openings in the floor which are covered by a big heavy stone. When the stone is lifted up, a special mechanism detects this and activates poisoned arrows that are shot near the opening. The only possibility i…

Problem Description 话说上回讲到海东集团推选老总的事情,最终的结果是XHD以微弱优势当选,从此以后,"徐队"的称呼逐渐被"徐总"所取代,海东集团(HDU)也算是名副其实了. 创业是需要地盘的,HDU向钱江肉丝高新技术开发区申请一块用地,很快得到了批复,据说这是因为他们公司研发的"海东牌"老鼠药科技含量很高,预期将占全球一半以上的市场.政府划拨的这块用地是一个多边形,为了描述它,我们用逆时针方向的顶点序列来表示,我们很想了解这块…

Problem Description Today is Ignatius' birthday. He invites a lot of friends. Now it's dinner time. Ignatius wants to know how many tables he needs at least. You have to notice that not all the friends know each other, and all the friends do not want…