HDU 1829 & POJ 2492 A Bug's Life (并查集)

                                                                               A Bug's Life

Time Limit: 10000MSMemory Limit: 65536KTotal Submissions: 23483Accepted: 7638

Description

Background
Professor Hopper is researching the sexual behavior of a rare species of bugs. He assumes that they feature two different genders and that they only interact with bugs of the opposite gender. In his experiment, individual bugs and their interactions were easy to identify, because numbers were printed on their backs.
Problem
Given a list of bug interactions, decide whether the experiment supports his assumption of two genders with no homosexual bugs or if it contains some bug interactions that falsify it.

Input

The first line of the input contains the number of scenarios. Each scenario starts with one line giving the number of bugs (at least one, and up to 2000) and the number of interactions (up to 1000000) separated by a single space. In the following lines, each interaction is given in the form of two distinct bug numbers separated by a single space. Bugs are numbered consecutively starting from one.

Output

The output for every scenario is a line containing "Scenario #i:", where i is the number of the scenario starting at 1, followed by one line saying either "No suspicious bugs found!" if the experiment is consistent with his assumption about the bugs' sexual behavior, or "Suspicious bugs found!" if Professor Hopper's assumption is definitely wrong.

Sample Input

23 31 22 31 34 21 23 4

Sample Output

Scenario #1:Suspicious bugs found!Scenario #2:No suspicious bugs found!

/*  并查集  对于输入的两个值s,e，首先判断他们是否是同个集合，如果是，  则说明出现了与假设矛盾的结果，用bool标记一下。  否则，将s的相反性别的与e合并，e的相反性别与s合并。    390MS260K  */#include <iostream>#include <cstdio>#include <cstring>#include <algorithm>#define SIZE 2005using namespace std;struct node{    int fa,opp;}fat[SIZE];int Case,n,m;int find(int x){    if(x != fat[x].fa)        fat[x].fa = find(fat[x].fa);    return fat[x].fa;}void combine(int x,int y){    int tx = find(x);    int ty = find(y);    if(tx != ty)        fat[tx].fa = ty;}int main(){    scanf("%d",&Case);    for(int ca=1; ca<=Case; ca++)    {        scanf("%d%d",&n,&m);        for(int i=1; i<=n; i++)        {            fat[i].fa = i; fat[i].opp = 0;        }        bool flag = false;        int s,e;        for(int i=1; i<=m; i++)        {            scanf("%d%d",&s,&e);            if(flag)continue;            if(find(s) == find(e))                flag = true;            if(fat[s].opp)                combine(fat[s].opp,e);            if(fat[e].opp)                combine(fat[e].opp,s);            fat[s].opp = e;            fat[e].opp = s;        }        printf("Scenario #%d:\n",ca);        if(flag)            printf("Suspicious bugs found!\n\n");        else            printf("No suspicious bugs found!\n\n");    }    return 0;}