Submission #904010

#TimeUsernameProblemLanguageResultExecution timeMemory
904010GabrielTravelling Merchant (APIO17_merchant)C++17
33 / 100
74 ms4996 KiB
#include "bits/stdc++.h" using namespace std; #define Mucho LLONG_MAX / 2 long long N, M, K; vector< vector<long long> > Compra, Venta, Grafo1, Ganancia, Grafo2; void Floyd_Warshall(vector< vector<long long> > &Grafo){ for(long long i = 0; i < N; i++) for(long long j = 0; j < N; j++) for(long long k = 0; k < N; k++) Grafo[j][k] = min(Grafo[j][k], Grafo[j][i] + Grafo[i][k]); } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cin>>N>>M>>K; vector<long long> a(N, Mucho); vector<long long> b(K, Mucho); vector<long long> c(N, 0); Grafo1.assign(N, a); Grafo2.assign(N, a); Compra.assign(N, b); Venta.assign(N, b); Ganancia.assign(N, c); for(long long i = 0; i < N; i++) for(long long j = 0; j < K; j++) cin>>Compra[i][j]>>Venta[i][j]; for(long long i = 0; i < M; i++){ long long V, W, T; cin>>V>>W>>T; Grafo1[V - 1][W - 1] = T; } Floyd_Warshall(Grafo1); for(long long i = 0; i < N; i++) for(long long j = 0; j < N; j++) for(long long k = 0; k < K; k++) if(Venta[j][k] != -1 and Compra[i][k] != -1) Ganancia[i][j] = max(Ganancia[i][j], Venta[j][k] - Compra[i][k]); long long Inicio = 0; long long Final = 1e9; while(Inicio <= Final){ long long Promedio = (Inicio + Final) / 2; for(long long i = 0; i < N; i++) for(long long j = 0; j < N; j++) Grafo2[i][j] = Promedio * min(Grafo1[i][j], Mucho / Promedio) - Ganancia[i][j]; Floyd_Warshall(Grafo2); bool Ciclo_positivo = 0; for(long long i = 0; i < N; i++) if(Grafo2[i][i] <= 0) Ciclo_positivo = 1; if(Ciclo_positivo) Inicio = Promedio + 1; else Final = Promedio - 1; } cout<<Final; return 0; }
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