USACO 3.1.1

题目：请戳此处

/*ID:xz153531LANG: C++TASK: agrinet*/#include<stdio.h>#include<stdlib.h>int a[101][101],b[101],dj;int main(){freopen("agrinet.in","r",stdin);freopen("agrinet.out","w",stdout);int i,j,k,n,m,x,y,w,min,t;scanf("%d",&n);for (i=1;i<=n;i++)for (j=1;j<=n;j++)scanf("%d",&a[i][j]);b[1]=1; dj=0;for (k=2;k<=n;k++){min=200000;for (i=1;i<=n;i++)if (b[i]) for (j=1;j<=n;j++)if ((b[j]==0) && (a[i][j]<min) && (a[i][j])){min=a[i][j]; t=j;}  b[t]=1; dj+=min;}printf("%d\n",dj);return 0;}