rwkj 1505---- poj 1258

#include <iostream>// poj 1258 10.1.5.253 1505
using namespace std;
#define N 105 // 顶点的最大个数 (多写
int a[N][N],low[N],n,ans;
int min(int x,int y)
{ return x<y?x:y; }

void prim(int u0)
{
int i,j,m,k;
ans=0; //
for (i=1;i<n;i++)
low[i]=a[u0][i]; //
low[u0]=-1;
for (i=1;i<n;i++) //循环n-1次 依次加入n-1个顶点
{
m=1<<20;
for (j=0;j<n;j++) //找一个最小的的边
if (low[j]!=-1&&low[j]<m)
{ m=low[j]; k=j; }
ans+=m; //
low[k]=-1;
for (j=0;j<n;j++) //
if (low[j]!=-1)
low[j]=min(low[j],a[k][j]);
}
}

int main()
{
int i,j;
while(cin>>n&&n>=3)
{
for (i=0;i<n;i++) //邻接矩阵
for (j=0;j<n;j++)
cin>>a[i][j];
prim(0); // 从0开始
cout<<ans<<endl;
}
return 0;
}

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时间: 2024-10-10 05:04:07

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