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- #include<fstream>
- using namespace std;
- ifstream f("prim.in");
- ofstream g("prim.out");
- const int inf=1000000000;
- int n,m,a[101][101],viz[101],d[101],t[101];
- int main()
- {
- f>>n>>m;
- for(int i=1;i<=n;i++)
- for(int j=1;j<=n;j++)
- if(i!=j) a[i][j]=inf;
- for(int p,q,cost,i=1;i<=m;i++)
- {
- f>>p>>q>>cost;
- a[p][q]=a[q][p]=cost;
- }
- for(int j=1;j<=n;j++)
- {
- d[j]=a[1][j];
- if(j!=1) t[j]=1;
- }
- viz[1]=1;d[0]=inf;
- for(int k=2;k<=n;k++)
- {
- int poz=0;
- for(int i=1;i<=n;i++)
- if(!viz[i]&&d[i]<d[poz]) poz=i;
- viz[poz]=1;
- for(int i=1;i<=n;i++)
- if(!viz[i]&&d[i]>a[poz][i])
- {
- d[i]=a[poz][i];
- t[i]=poz;
- }
- }
- int cost=0;
- for(int i=1;i<=n;i++)
- cost+=d[i];
- g<<cost<<'\n';
- for(int i=1;i<=n;i++)
- g<<t[i]<<' ';
- g.close();f.close();
- return 0;
- }
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