UVa 10034 Freckles

/*Author: ACb0yDate: 2010-5-22Result: ACDescripition: UVa 10034 Freckles(mst)*/#include <iostream>#include <cmath>using namespace std;double INF = 1 << 30;struct point {double x;double y;};double d[110];point ps[110];int vis[110];int n;double get_dis(int a, int b) {return sqrt((ps[a].x - ps[b].x) * (ps[a].x - ps[b].x) + (ps[a].y - ps[b].y) * (ps[a].y - ps[b].y));}double mst() {int i, j;for (i = 0; i < n; i++) {d[i] = INF;}d[0] = 0;double ans = 0;memset(vis, 0, sizeof(vis));for (i = 0; i < n; i++) {double min = INF;int pos;for (j = 0; j < n; j++) if (!vis[j]) {if (d[j] < min) {min = d[j];pos = j;}}ans += min;vis[pos] = 1;for (j = 0; j < n; j++) if (!vis[j]) {double temp = get_dis(pos, j);if (temp < d[j]) {d[j] = temp;}}}return ans;}int main() {#ifndef ONLINE_JUDGEfreopen("10034.txt", "r", stdin);#endifint k;cin >> k;while (k--) {cin >> n;for (int i = 0; i < n; i++) {cin >> ps[i].x >> ps[i].y;}printf("%.2lf/n", mst());if (k != 0) {cout << endl;}}return 0;}