MST-kruskal ElogE+V

hdu 1233

#include<stdio.h>
#include<algorithm>
using namespace std;
struct dis
{
        int a, b, c;
} s[];
int cmp(dis x, dis y)
{
        return x.c < y.c;
}
int father[];
int fsize[];
int findfather(int y)
{
        int r = y;
        while (r != father[r])
        {
                r = father[r];
        }
        return r;
}
int combine(int a, int b)
{
        int fx = findfather(a);
        int fy = findfather(b);
        if (fx != fy)
        {
                if (fsize[fx] >= fsize[fy])
                {
                        father[fy] = fx;
                        fsize[fx] += fsize[fy];
                        fsize[fy] = ;
                }
                else
                {
                        father[fx] = fy;
                        fsize[fy] += fsize[fx];
                        fsize[fx] = ;
                }
                return ;
        }
        else
        {
                return ;
        }
}
int main()
{
        int t, i, n, sum, m;
        while (~scanf("%d", &t), t)
        {
                n = t * (t - ) / ;
                for (i = ; i <= t; i++)
                {
                        fsize[i] = ;
                        father[i] = i;
                }
                for (i = ; i < n; i++)
                {
                        scanf("%d%d%d", &s[i].a, &s[i].b, &s[i].c);
                }
                sort(s, s + n, cmp);
                m = , sum = ;
                for (i = ; i < n && m < t; i++)
                {
                        if (combine(s[i].a, s[i].b))
                        {
                                m++;
                                sum += s[i].c;
                        }
                }
                printf("%d\n", sum);
        }
        return ;
}