Poj(2236),简单并查集

题目链接：http://poj.org/problem?id=2236

思路很简单，傻逼的我输出写成了FALL，然后遍历的时候for循环写错了，还好很快我就Debug出来了。

#include <stdio.h>

struct Point
{
    int x,y;
} points[];

int father[];
bool vis[]= {false};

int Find_Set (int x)
{
    if(x!=father[x])
        father[x] = Find_Set(father[x]);
    return father[x];
}

int main()
{

    int N,d;
    scanf("%d%d",&N,&d);

    for(int i=; i<=N; i++)
        father[i] = i;

    for(int i=; i<=N; i++)
        scanf("%d%d",&points[i].x,&points[i].y);
    getchar();

    char ch;
    while(scanf("%c",&ch)!=EOF)
    {
        getchar();
        int n,m;
        if(ch=='O')
        {
            scanf("%d",&n);
            getchar();
            vis[n] = true;

            for(int i=; i<=N; i++)
            {
                if(i!=n&&vis[i])
                {
                    int tx = points[n].x - points[i].x;
                    int ty = points[n].y - points[i].y;
                    if(tx*tx+ty*ty<=d*d)
                    {
                        int fx = Find_Set(i);
                        int fy = Find_Set(n);

                        if(fx!=fy)
                            father[fy] = fx;
                    }
                }
            }
        }
        else
        {
            scanf("%d%d",&n,&m);
            getchar();

            int fx,fy;
            fx = Find_Set(n);
            fy = Find_Set(m);
            if(fx!=fy)
                printf("FAIL\n");
            else printf("SUCCESS\n");

        }
    }

    return ;
}