This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <iostream>
using namespace std;
int INF=1e9;
int N,M,K;
int x,y;
int C[100][1005][2];
int D[105][105];
int P[105][105];
int main(){
cin>>N>>M>>K;
for(int i=0;i<N;i++)
for(int j=0;j<K;j++)
cin>>C[i][j][0]>>C[i][j][1];
for(int i=0;i<N;i++)
for(int j=0;j<N;j++)
D[i][j]=(i==j)?0:INF;
for(int i=0;i<M;i++)
cin>>x>>y>>D[x-1][y-1];
for(int k=0;k<N;k++)
for(int i=0;i<N;i++)
for(int j=0;j<N;j++)
D[i][j]=min(D[i][j],D[i][k]+D[k][j]);
for(int a=0;a<N;a++)
for(int b=0;b<N;b++)
for(int j=0;j<K;j++)
if(C[a][j][0]!=-1 and C[b][j][1]!=-1)
P[a][b]=max(P[a][b],C[b][j][1]-C[a][j][0]);
int ans=0;
for(int i=1;i<N;i++)
ans=max(ans,(P[0][i]+P[i][0])/(D[0][i]+D[i][0]));
cout<<ans;
}
/*for(int a=0;a<N;a++)
for(int b=0;b<N;b++)
cout<<a<<" "<<b<<" "<<P[a][b]<<endl;*/
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