Uva 10158 War

并查集的应用 直接阔成2倍。后N项为对应的敌人

#include <map>
#include <set>
#include <list>
#include <cmath>
#include <ctime>
#include <deque>
#include <stack>
#include <queue>
#include <cctype>
#include <cstdio>
#include <string>
#include <vector>
#include <climits>
#include <cstdlib>
#include <cstring>
#include <iostream>
#include <algorithm>
#define LL long long
#define PI 3.1415926535897932626
using namespace std;
int gcd(int a, int b) {return a % b ==  ? b : gcd(b, a % b);}
#define MAXN 10010
int p[MAXN * ];
int Find(int x) {return x == p[x] ? x : p[x] = Find(p[x]);}
int N,M;
int main()
{
    //freopen("sample.txt","r",stdin);
    while (scanf("%d",&N) != EOF)
    {
        for (int i = ; i <= N * ; i++) p[i] = i;
        int op,x,y;
        while (scanf("%d%d%d",&op,&x,&y) != EOF)
        {
            if (op ==  && x ==  && y == ) break;
            int  u = Find(x), v = Find(y);
            int  eu = Find(x + N) , ev = Find(y + N);
            switch (op)
            {
                case  : if (u == ev) puts("-1");
                         else
                         {
                             p[u] = v;
                             p[eu] = ev;
                         }
                         break;
                case  : if (u == v) puts("-1");
                         else
                         {
                             p[u] = ev;
                             p[eu] = v;
                         }
                         break;
                case  : if (u == v) puts("");
                         else puts("");
                         break;
                case  : if (u == ev) puts("");
                         else puts("");
                         break;
            }
        }
    }
    return ;
}