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- #include <iostream>
- #include <fstream>
- #define INF 0x3F3F3F3F
- using namespace std;
- int i,n,m,x,y,z,a[101][101],k,j,iodnod,d[101][101];
- double med,mini=100001;
- int main()
- {cin>>n>>m;
- for(i=1;i<=m;i++)
- {
- cin>>x>>y>>z;
- a[x][y]=z;
- }
- for(i=1;i<=n;i++)
- {
- for(j=1;j<=n;j++)
- {
- if(a[i][j]==0&&i!=j)
- a[i][j]=INF;
- d[i][j]=a[i][j];
- }
- }
- for(int k = 1 ; k <= n ; k ++)
- for(int ii = 1 ; ii <= n ; ii ++)
- for(int jj = 1 ; jj <= n ; jj ++)
- if(d[ii][jj] > d[ii][k] + d[k][jj])
- d[ii][jj] = d[ii][k] + d[k][jj];
- for(i=1;i<=n;i++)
- {
- for(j=1;j<=n;j++)
- {
- if(a[i][j]==d[i][j]&&i!=j&&a[i][j]!=INF)
- iodnod++;
- }
- }
- cout<<iodnod;
- return 0;
- }
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