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;
using i64 = long long;
using u64 = unsigned long long;
using i32 = int;
using u32 = unsigned;
using i16 = short;
using u16 = unsigned short;
using ld = long double;
using ii = pair<int, int>;
const int N = 100, K = 1e3, inf = 1e9 + 100;
i64 num[N][N], dem[N][N];
int e[N][N], buy[N][K], dist[N][N], sell[N][K];
void solve() {
int n, m, p;
cin >> n >> m >> p;
for(int i = 0; i < n; ++i) {
for(int j = 0; j < p; ++j) {
cin >> buy[i][j];
if(buy[i][j] == -1) buy[i][j] = inf;
}
for(int j = 0; j < p; ++j) {
cin >> sell[i][j];
if(sell[i][j] == -1) sell[i][j] = -inf;
}
for(int j = 0; j < n; ++j) dist[i][j] = inf;
}
for(int i = 0; i < n; ++i) {
for(int j = 0; j < n; ++j) {
if(i == j) continue;
for(int k = 0; k < p; ++k)
e[i][j] = max(e[i][j], sell[j][k] - buy[i][k]);
}
}
for(int i = 0; i < m; ++i) {
int u, v, w;
cin >> u >> v >> w;
--u, --v;
dist[u][v] = 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]);
for(int i = 0; i < n; ++i) {
for(int j = 0; j < n; ++j) {
num[i][j] = e[i][j];
dem[i][j] = dist[i][j];
}
}
for(int k = 0; k < n; ++k) {
for(int i = 0; i < n; ++i) {
for(int j = 0; j < n; ++j) {
i64 P = num[i][j], Q = dem[i][j];
i64 R = num[i][k] + num[k][j], S = dem[i][k] + dem[k][j];
if((double)P / Q <= (double)R / S)
num[i][j] = R, dem[i][j] = S;
}
}
}
i64 ans = 0;
for(int i = 0; i < n; ++i) ans = max(ans, num[i][i] / dem[i][i]);
cout << ans << '\n';
}
int main() {
ios_base :: sync_with_stdio(false);
cin.tie(0);
int t = 1;
//cin >> t;
while(t--) solve();
return 0;
}
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