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>
#define fast cin.tie(0)->sync_with_stdio(0);
#define int long long
#define inf ((int)1e18)
using namespace std;
int32_t main(){
fast
int n, m, K;
cin >> n >> m >> K;
vector <vector<int> > dist(n, vector <int> (n, inf));
vector <vector<pair<int, int> > > opt(n, vector <pair<int, int> > (n));
vector <vector<pair<int, int> > > price(n, vector <pair<int, int> > (K));
for(int i = 0; i < n; i++) {
for(int j = 0; j < K; j++) {
int a, b;
cin >> a >> b;
price[i][j] = {a, b};
}
}
for(int i = 0; i < m; i++) {
int a, b, w;
cin >> a >> b >> w;
a--, b--;
dist[a][b] = min(dist[a][b], w);
}
for(int k = 0; k < n; k++) {
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]);
}
}
}
auto maxi = [](pair<int, int> a, pair<int, int> b) {
__int128__ aa = a.first * b.second, bb = b.first * a.second;
if(aa > bb) {
return a;
}
else if(aa == bb) {
return min(a, b);
}
return b;
};
auto add = [](pair<int, int> a, pair<int, int> b) {
return make_pair(a.first + b.first, a.second + b.second);
};
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
opt[i][j].second = dist[i][j];
for(int item = 0; item < K; item++) {
int sell = price[j][item].second, buy = price[i][item].first;
if(~sell and ~buy) {
opt[i][j] = maxi(opt[i][j], {sell - buy, dist[i][j]});
}
}
}
}
for(int k = 0; k < n; k++) {
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
opt[i][j] = maxi(opt[i][j], add(opt[i][k], opt[k][j]));
}
}
// for(int i = 0; i < n; i++) {
// for(int j = 0; j < n; j++) {
// cout << opt[i][j].first % inf << " ";
// }
// cout << "\n";
// }
// cout << "\n";
// for(int i = 0; i < n; i++) {
// for(int j = 0; j < n; j++) {
// cout << opt[i][j].second % inf << " ";
// }
// cout << "\n";
// }
// cout << "---------------------\n";
}
pair<int, int> ans = {0, 1};
for(int st = 0; st < n; st++) {
if(dist[st][st] == inf) continue;
for(int i = 0; i < n; i++) {
for(int j = 0; j < n; j++) {
// if(i == j) continue;
auto go = opt[st][i], come = opt[j][st];
if(i == st) go = {0, 0};
if(j == st) come = {0, 0};
// cout << add(add(go, come), opt[i][j]).first << " " << add(add(go, come), opt[i][j]).second << "\n";
ans = maxi(ans, add(add(go, come), opt[i][j]));
}
}
// cout << ans.first << " " << ans.second << "\n\n";
}
cout << ans.first / ans.second << "\n";
}
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