Submission #409540

#TimeUsernameProblemLanguageResultExecution timeMemory
409540CursedCodeTravelling Merchant (APIO17_merchant)C++14
21 / 100
137 ms2224 KiB
#include <bits/stdc++.h> using namespace std; int n,m,k; long long buy[105][1005],sell[105][1005]; long long adj[105][105],efficent[105][105]; long long profit[105][105]; const long long inf=10e15; int main(){ ios_base::sync_with_stdio(false); cin.tie(NULL); cin >> n >> m >> k; for(int i = 1;i <= n;i++){ for(int j = 1;j <= k;j++) cin >> buy[i][j] >> sell[i][j]; } for(int i = 1;i <= n;i++){ for(int j = 1;j <= n;j++) adj[i][j] = inf; } for(int i = 1;i <= m;i++){ long long u,v,w; cin >> u >> v >> w; adj[u][v] = w; } for(int l = 1;l <= n;l++){ for(int i = 1;i <= n;i++){ for(int j = 1;j <= n;j++){ adj[i][j] = min(adj[i][j] , adj[i][l] + adj[l][j]); } } } for(int i = 1;i <= n;i++){ for(int j = 1;j <= n;j++){ if(adj[i][j] >= inf){ profit[i][j] = -inf; continue; } for(int cnt = 1;cnt <= k;cnt++){ if(sell[j][cnt] == -1 || buy[i][cnt] == -1) continue; profit[i][j] = max(profit[i][j] , sell[j][cnt] - buy[i][cnt]); } } } long long lower = 0,higher = inf; while(lower<higher){ long long mid = (lower + higher + 1) / 2; for(int i = 1;i <= n;i++){ for(int j = 1;j <= n;j++){ if(adj[i][j] >= inf) efficent[i][j] = -inf; else efficent[i][j] = profit[i][j] - mid * adj[i][j]; } } for(int l=1;l<=n;l++){ for(int i = 1;i <= n;i++){ for(int j = 1;j <= n;j++){ if(adj[i][l] >= inf || adj[j][l] >= inf) continue; efficent[i][j] = max(efficent[i][j] , efficent[i][l] + efficent[l][j]); } } } bool check = false; for(int i = 1;i <= n;i++){ if(efficent[i][i] >= 0){ check = true; break; } } if(check) lower=mid; else higher=mid-1; } cout << lower; return 0; }
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