62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#include<cstdio>
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#include<cstring>
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#include<algorithm>
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#include<map>
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#include<string>
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#include<cmath>
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#include<cstdlib>
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#include<queue>
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using namespace std;
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#define ll long long
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#define db double
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const int maxn=108;
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const int INF=0x7f7f7f7f;
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int mp[maxn][maxn];
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int low[maxn],vis[maxn];
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int sum;
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void prim(int n)
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{
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int i,j,k,mi;
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memset(vis,0,sizeof(vis));
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for(i=1;i<=n;i++)
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low[i]=mp[1][i];
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for(i=2;i<=n;i++)
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{
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mi=INF;
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for(j=2;j<=n;j++)
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if(!vis[j]&&low[j]<mi)
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{
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k=j;
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mi=low[j];
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}
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vis[k]=1;
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for(j=2;j<=n;j++)
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if(!vis[j]&&low[j]>mp[k][j])
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low[j]=mp[k][j];
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}
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for(i=1;i<=n;i++)
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sum+=low[i];
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}
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int main()
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{
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int i,j,k,n,a,b,c,d,m;
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while(scanf("%d",&n)==1&&n)
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{
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memset(mp,INF,sizeof(mp));
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for(i=1;i<=n;i++) mp[i][i]=0;
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m=n*(n-1)/2;
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for(i=1;i<=m;i++)
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{
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scanf("%d%d%d%d",&a,&b,&c,&d);
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if(d==1)
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mp[a][b]=mp[b][a]=0;
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else
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mp[a][b]=mp[b][a]=c;
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}
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sum=0;
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prim(n);
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printf("%d\n",sum);
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}
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return 0;
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}
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