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  • zoj 1586

    http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemCode=1586

    //zoj 1586
    #include<iostream>
    #include<cstdio>
    using namespace std;
    #define N 1005
    int a[N][N],low[N],n,ans;
    int b[N];
    
    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++)
        {
            m=1<<20;
            for (j=0;j<n;j++)
                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,t;
       scanf("%d",&t);
       while(t--)
       {
          scanf("%d",&n);
          for(i=0;i<n;i++)  scanf("%d",&b[i]);
          
          for(i=0;i<n;i++)
          {
             for(j=0;j<n;j++)
             {
                scanf("%d",&a[i][j]);
                a[i][j]+=b[i]+b[j];
             }
          }
          prim(0);
          cout<<ans<<endl;
       }
       return 0;
    }
    
    
    
    
    
    ***************************************************************************************************
    
    
    
    
    
    #include<iostream>
    #include<cstdio>
    using namespace std;
    #define N 1005
    int a[N][N],low[N],n,ans;
    int b[N];
    
    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++)
        {
            m=1<<20;
            for (j=0;j<n;j++)
                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,t;
       scanf("%d",&t);
       while(t--)
       {
          scanf("%d",&n);
          for(i=0;i<n;i++)  scanf("%d",&b[i]);
          
          for(i=0;i<n;i++)
          {
             for(j=0;j<n;j++)
             {
                scanf("%d",&a[i][j]);
                if(i=j)   a[i][j]=1<<20;    //对角线 
               else a[i][j]+=b[i]+b[j];
             }
          }
          prim(0);
          cout<<ans<<endl;
       }
       return 0;
    }
    
    
    
    
    
    **************************************************************************888
    
    
    
    
    #include<iostream>
    #include<cstdio>
    using namespace std;
    #define N 1005
    #define INF 1000000 
    int a[N][N],low[N],n,ans;
    int b[N];
    
    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++)
        {
            m=1<<20;
            for (j=0;j<n;j++)
                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,t;
       scanf("%d",&t);
       while(t--)
       {
          scanf("%d",&n);
          for(i=0;i<n;i++)  scanf("%d",&b[i]);
          
          for(i=0;i<n;i++)
          {
             for(j=0;j<n;j++)
             {
                scanf("%d",&a[i][j]);
                if(i=j)   a[i][j]=INF;    //对角线 
               else a[i][j]+=b[i]+b[j];
             }
          }
          prim(0);
          cout<<ans<<endl;
       }
       return 0;
    }
    

      

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  • 原文地址:https://www.cnblogs.com/wc1903036673/p/3462133.html
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