【POJ 1703】 Find them,Catch them

【题目链接】

http://poj.org/problem?id=1703

【算法】

并查集 + 拆点

【代码】

#include <algorithm>
#include <bitset>
#include <cctype>
#include <cerrno>
#include <clocale>
#include <cmath>
#include <complex>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <ctime>
#include <deque>
#include <exception>
#include <fstream>
#include <functional>
#include <limits>
#include <list>
#include <map>
#include <iomanip>
#include <ios>
#include <iosfwd>
#include <iostream>
#include <istream>
#include <ostream>
#include <queue>
#include <set>
#include <sstream>
#include <stdexcept>
#include <streambuf>
#include <string>
#include <utility>
#include <vector>
#include <cwchar>
#include <cwctype>
#include <stack>
#include <limits.h>
using namespace std;
const int MAXN = 1e5 + 10;

int i,T,x,y,n,m;
int fa[MAXN<<1];
char opt[5];

inline int get_root(int x)
{
        if (fa[x] == x) return x;
        return fa[x] = get_root(fa[x]);
}

int main()
{

        scanf("%d",&T);
      while (T--)
      {
              scanf("%d%d",&n,&m);
                for (i = 1; i <= 2 * n; i++) fa[i] = i;
                for (i = 1; i <= m; i++)
                {
                        scanf("%s",&opt);
                        if (opt[0] == ‘A‘)
                        {
                                scanf("%d%d",&x,&y);
                                if (get_root(x) == get_root(y)) printf("In the same gang.\n");
                                else if (get_root(x+n) == get_root(y)) printf("In different gangs.\n");
                                else printf("Not sure yet.\n");
                        }    else
                        {
                                scanf("%d%d",&x,&y);
                                fa[get_root(x+n)] = get_root(y);
                                fa[get_root(y+n)] = get_root(x);
                        }
                }
        }

        return 0;

}

原文地址：https://www.cnblogs.com/evenbao/p/9275492.html