Eddy‘s picture

Eddy’s picture
裸的最小生成树

#include<bits/stdc++.h>
using namespace std;double x[105];
double y[105];
int root[105];
int sum = 0;
double minTree = 0.0;struct node {int i;int j;double len;
}edge[10005];int f(int x) {if(x == root[x]) return x;return (root[x] = f(root[x]));
}bool cmp(node a, node b) {return a.len < b.len;
}void krusual() {for(int i = 1; i <= sum; i++) {if(f(edge[i].i) != f(edge[i].j)) {minTree += edge[i].len;root[edge[i].j] = edge[i].j;}}
}int main() {int n;while(cin >> n) {for(int i = 1; i <= n; i++) {root[i] = i;}sum = 0;minTree = 0.0;for(int i = 1; i <= n; i++) {cin >> x[i] >> y[i];for(int j = 1; j <= i; j++) {edge[++sum].i = i;edge[sum].j = j;edge[sum].len = sqrt((x[i] - x[j]) * (x[i] - x[j]) + (y[i] - y[j]) * (y[i] - y[j]));}}sort(edge + 1, edge + 1 + sum, cmp);krusual();printf("%.2f\n", minTree);}return 0;
}

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