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<bits/stdc++.h>
using namespace std;
typedef long long ll;
const int MAXN = 100 + 10;
const ll MAX = 1e17;
int n, m, k;
ll mat[MAXN][MAXN], tmp[MAXN][MAXN], b[MAXN][MAXN], s[MAXN][MAXN], res[MAXN][MAXN];
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin >> n >> m >> k;
for(int i = 0; i < n; i ++){
fill(mat[i], mat[i] + n, MAX/2);
for(int j = 0; j < k; j ++)
cin >> b[i][j] >> s[i][j];
}
for(int i = 0; i < m; i ++){
int u, v;
ll w;
cin >> u >> v >> w, u --, v --;
mat[u][v] = w;
}
for(int i = 0; i < n; i ++)
for(int j = 0; j < n; j ++)
for(int t = 0; t < n; t ++)
mat[j][t] = min(mat[j][t], mat[j][i] + mat[i][t]);
for(int i = 0; i < n; i ++)
for(int j = 0; j < n; j ++)
for(int t = 0; t < k; t ++)
if( s[j][t] != -1 && b[i][t] != -1)
res[i][j] = max(res[i][j], s[j][t] - b[i][t]);
ll l = 0, r = MAX/2, ans = MAX/2;
while( l <= r){
ll mid = (l + r)/2;
for(int i = 0; i < n; i ++)
for(int j = 0; j < n; j ++)
tmp[i][j] = mid*min(mat[i][j], MAX/2*mid) - res[i][j];
for(int i = 0; i < n; i ++)
for(int j = 0; j < n; j ++)
for(int t = 0; t < n; t ++)
tmp[j][t] = min(tmp[j][t], tmp[j][i] + tmp[i][t]);
bool dor = false;
for(int i = 0; i < n; i ++)
for(int j = 0; j < n; j ++)
for(int t = 0; t < n; t ++)
if( tmp[j][t] > tmp[j][i] + tmp[i][t])
dor = true;
if( dor ) l = mid + 1;
else r = mid - 1, ans = min(ans, mid);
}
cout << ans << endl;
return 0;
}
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