UVA 1329 Corporative Network【并查集】

[code]#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <string.h>
#include <queue>
#include <stack>
#include <map>

using namespace std;

int fa[1000010];
int d[1000010];

int fd(int x)
{
    if (fa[x] != -1)
    {
        int rot = fd(fa[x]);
        d[x] += d[fa[x]];
        return fa[x] = fd(fa[x]);
    }
    else return x;
}

int main()
{
    int a, b;
    int t, n;
    scanf("%d",&t);
    char cmd[10];
    while (t--)
    {
        memset(fa, -1, sizeof(fa));
        memset(d,0,sizeof(d));
        scanf("%d", &n);
        while (scanf("%s", cmd) && cmd[0] != 'O')
        {
            if (cmd[0] == 'E')
            {
                scanf("%d", &a);
                fd(a);
                printf("%d\n", d[a]);
            }
            else
            {
                scanf("%d%d", &a, &b);
                fa[a] = b;
                d[a] = abs(a - b) % 1000;
            }
        }
    }
    return 0;
}