제출 #732370

#제출 시각아이디문제언어결과실행 시간메모리
732370SanguineChameleon여행하는 상인 (APIO17_merchant)C++17
100 / 100
94 ms3404 KiB
#include <bits/stdc++.h> using namespace std; void just_do_it(); int main() { #ifdef KAMIRULEZ freopen("kamirulez.inp", "r", stdin); freopen("kamirulez.out", "w", stdout); #endif ios_base::sync_with_stdio(0); cin.tie(0); just_do_it(); return 0; } const int maxN = 1e2 + 20; const int maxK = 1e3 + 20; const int inf1 = 1e9 + 20; const long long inf2 = 1e18L + 20; int buy[maxN][maxK]; int sell[maxN][maxK]; int dist[maxN][maxN]; int prof[maxN][maxN]; long long cost[maxN][maxN]; long long dist2[maxN]; int flag[maxN]; int N, M, K; bool dfs(int u) { flag[u] = 0; for (int v = 1; v <= N; v++) { if (v != u && dist2[u] + cost[u][v] == dist2[v]) { if (flag[v] == 0 || (flag[v] == -1 && dfs(v))) { return true; } } } flag[u] = 1; return false; } bool check() { for (int i = 1; i <= N; i++) { dist2[i] = 0; } for (int iter = 0; iter < N; iter++) { for (int i = 1; i <= N; i++) { for (int j = 1; j <= N; j++) { if (dist2[j] < dist2[i] + cost[i][j]) { if (iter == N - 1) { return true; } dist2[j] = dist2[i] + cost[i][j]; } } } } for (int i = 1; i <= N; i++) { flag[i] = -1; } for (int i = 1; i <= N; i++) { if (flag[i] == -1 && dfs(i)) { return true; } } return false; } void just_do_it() { cin >> N >> M >> K; for (int i = 1; i <= N; i++) { for (int j = 1; j <= N; j++) { if (i == j) { dist[i][j] = 0; } else { dist[i][j] = inf1; } } } 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 <= M; i++) { int u, v, w; cin >> u >> v >> w; dist[u][v] = min(dist[u][v], w); } for (int k = 1; k <= N; k++) { for (int i = 1; i <= N; i++) { for (int j = 1; j <= N; j++) { dist[i][j] = min(dist[i][j], dist[i][k] + dist[k][j]); } } } for (int i = 1; i <= N; i++) { for (int j = 1; j <= N; j++) { prof[i][j] = 0; for (int k = 1; k <= K; k++) { if (buy[i][k] != -1 && sell[j][k] != -1) { prof[i][j] = max(prof[i][j], sell[j][k] - buy[i][k]); } } } } int res = 0; int lt = 1; int rt = inf1; while (lt <= rt) { int mt = (lt + rt) / 2; for (int i = 1; i <= N; i++) { for (int j = 1; j <= N; j++) { if (dist[i][j] == inf1) { cost[i][j] = -inf2; } else { cost[i][j] = 1LL * prof[i][j] - 1LL * dist[i][j] * mt; } } } if (check()) { res = mt; lt = mt + 1; } else { rt = mt - 1; } } cout << res; }
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