zoukankan      html  css  js  c++  java
  • POJ 2492 A Bug's Life

    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

    2
    3 3
    1 2
    2 3
    1 3
    4 2
    1 2
    3 4

    Sample Output

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

    Hint

    Huge input,scanf is recommended.

    大意就是,题目给出一对又一对的情侣,看看其中是不是有同性恋。

    种类并查集。

    用一个数组re保存祖先,然后判断两者的祖先是否相等,相等则同性。

    //Asimple
    //#include <bits/stdc++.h>
    #include <iostream>
    #include <sstream>
    #include <algorithm>
    #include <cstring>
    #include <cstdio>
    #include <vector>
    #include <cctype>
    #include <cstdlib>
    #include <stack>
    #include <cmath>
    #include <set>
    #include <map>
    #include <string>
    #include <queue>
    #include <limits.h>
    #include <time.h>
    #define INF 0xfffffff
    #define mod 10007
    #define CLS(a, v) memset(a, v, sizeof(a))
    #define debug(a)  cout << #a << " = "  << a <<endl
    #define abs(x) x<0?-x:x
    using namespace std;
    typedef long long ll;
    const int maxn = 2005;
    int fa[maxn];
    int re[maxn];
    int n, m, num, T, x, y;
    
    int find(int x) {
        if( fa[x]==x ) return x;
        int t = fa[x];
        fa[x] = find(fa[x]);
        re[x] = ( re[x] + re[t] +1 )%2;
        return fa[x];
    }
    
    void make_set(int x, int y) {
        int xx = find(x);
        int yy = find(y);
        fa[xx] = yy;
        re[xx] = (re[y]-re[x])%2;
    } 
    void input() {
        cin >> T;
        int cas = 1;
        while( cas<= T ) {
            bool f = true;
            cin >> n >> m;
            for(int i=1; i<=n; i++){
                fa[i] = i;
                re[i] = 1;
            }
            for(int i=0; i<m; i++) {
                cin >> x >> y;
                if( find(x)==find(y) ) {
                    if( re[x]==re[y] )
                        f = false;
                } else make_set(x, y);
            }
            printf("Scenario #%d:
    ", cas++);
            puts(f?"No suspicious bugs found!":"Suspicious bugs found!");
            puts("");
        }
    }
    
    int main() {
        input();
        return 0;
    }
    低调做人,高调做事。
  • 相关阅读:
    一步一步理解XMLDOM(一)
    按轨迹周期运动
    Python中’__main__’模块的作用
    多进程IPC与Python支持
    Eclipse启动多个Android模拟器
    解决Android平台移植ffmpeg的一揽子问题
    开源项目 GitHub地址
    使用viewpager嵌套实现上下左右滑动切换图片(IOS双向滚动翻页效果相同)
    Android中ScrollView消除阴影的办法
    如果项目为android library怎么运行
  • 原文地址:https://www.cnblogs.com/Asimple/p/6491175.html
Copyright © 2011-2022 走看看