【最小割】最小割Stoer-Wagner模板

int min_cut(int now)
{
    int ret = INF;
    for(int i = 0; i < n; i++) node[i] = i;
    while(now > 1) {
        int k, pre = 0;
        memset(vis, 0, sizeof(vis));
        memset(dis, 0, sizeof(dis));
        for(int i = 1; i < now; i++) {
            k = -1;
            for(int j = 1; j < now; j++) if(!vis[node[j]]) {
                dis[node[j]] += G[node[pre]][node[j]];
                if(k == -1 || dis[node[k]] < dis[node[j]]) {
                    k = j;
                }
            }
            vis[node[k]] = true;
            if(i == now - 1) {
                ret = min(ret, dis[node[k]]);
                for(int j = 0; j < now; j++) {
                    G[node[pre]][node[j]] += G[node[j]][node[k]];
                    G[node[j]][node[pre]] = G[node[pre]][node[j]];
                }
                node[k] = node[--now];
            }
            pre = k;
        }
    }
    return ret;
}