제출 #409296

#제출 시각아이디문제언어결과실행 시간메모리
409296CursedCode여행하는 상인 (APIO17_merchant)C++14
0 / 100
162 ms2368 KiB
#include <bits/stdc++.h> using namespace std; long long n,m,k; long long b[105][1005],s[105][1005],d[105][105]; long long adj[105][105],aral[105][105]; long long setup[105][105]; const long long inf=10e9; long double ans; int main(){ long long an = 0; cin >> n >> m >> k; for(int i = 1;i <= n;i++){ for(int j = 1;j <= k;j++){ cin >> b[i][j] >> s[i][j]; } } for(int i = 2;i <= n;i++){ for(int j = 1;j <= k;j++){ if(b[i][j] != -1) an = 1; } } if(an == 0){ for (int i = 1; i < n; i++) for (int j = 0; j < k; j++) if (b[i][j] != -1) return 0; { int v, w, t; for (int i = 0; i < m; i++) { cin >> v >> w >> t; d[--v][--w] = t; } } for (int p = 0; p < n; p++) for (int i = 0; i < n; i++) for (int j = 0; j < n; j++) d[i][j] = min(d[i][j], d[i][p] + d[p][j]); for (int i = 1; i < n; i++) for (int j = 0; j < k; j++) if (~b[0][j] && ~s[i][j]) ans = max(ans, (long double)(s[i][j] - b[0][j]) / (d[0][i] + d[i][0])); cout << (int)ans; return 0; } 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){ setup[i][j] =- inf; continue; } for(int cnt = 1;cnt <= k;cnt++){ if(s[j][cnt] == -1 || b[i][cnt] == -1) continue; setup[i][j] = max(setup[i][j] , s[j][cnt] - b[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) aral[i][j] = -inf; else aral[i][j] = setup[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; aral[i][j] = max(aral[i][j] , aral[i][l] + aral[l][j]); } } } bool check = false; for(int i = 1;i <= n;i++){ if(aral[i][i] >= 0){ check = true; break; } } if(check) lower=mid; else higher=mid-1; } cout<<lower<<endl; }
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