제출 #1089805

#제출 시각아이디문제언어결과실행 시간메모리
1089805alexander707070여행하는 상인 (APIO17_merchant)C++14
54 / 100
76 ms1628 KiB
#include<bits/stdc++.h> #pragma GCC optimize ("O3") #pragma GCC target ("sse4") #define MAXN 107 using namespace std; const long long inf=1e9; int n,m,k,a,b,c,s[MAXN][2007],cost[MAXN][MAXN]; long long dist[MAXN][MAXN]; long long dp[MAXN][MAXN]; void precalc(){ for(int k=1;k<=n;k++){ for(int i=1;i<=n;i++){ for(int f=1;f<=n;f++){ if(dist[i][k]+dist[k][f]<dist[i][f])dist[i][f]=dist[i][k]+dist[k][f]; } } } for(int i=1;i<=n;i++){ for(int f=1;f<=n;f++){ cost[i][f]=0; for(int t=1;t<=2*k;t+=2){ if(s[i][t]==-1 or s[f][t+1]==-1)continue; cost[i][f]=max(cost[i][f],-s[i][t]+s[f][t+1]); } } } } bool ok(long long x){ for(int i=1;i<=n;i++){ for(int f=1;f<=n;f++){ if(i==f)dp[i][f]=-inf; else dp[i][f]=cost[i][f]-dist[i][f]*x; } } for(int k=1;k<=n;k++){ for(int i=1;i<=n;i++){ for(int f=1;f<=n;f++){ if(dp[i][k]+dp[k][f]>dp[i][f]){ dp[i][f]=dp[i][k]+dp[k][f]; } } } } for(int i=1;i<=n;i++){ if(dp[i][i]>=0)return true; } return false; } int bin(){ int l=0,r=inf+1,tt; while(l+1<r){ tt=(l+r)/2; if(ok(tt)){ l=tt; }else{ r=tt; } } return l; } void check(){ for(int i=1;i<=n;i++){ for(int f=i+1;f<=n;f++){ if(dist[i][f]+dist[f][i]<inf)return; } } cout<<"-1\n"; cout<<1/0; exit(0); } int main(){ ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0); cin>>n>>m>>k; for(int i=1;i<=n;i++){ for(int f=1;f<=2*k;f++){ cin>>s[i][f]; } } for(int i=1;i<=n;i++){ for(int f=1;f<=n;f++){ dist[i][f]=inf; } dist[i][i]=0; } for(int i=1;i<=m;i++){ cin>>a>>b>>c; dist[a][b]=c; } precalc(); check(); cout<<bin()<<"\n"; return 0; }

컴파일 시 표준 에러 (stderr) 메시지

merchant.cpp: In function 'void check()':
merchant.cpp:87:9: warning: division by zero [-Wdiv-by-zero]
   87 |  cout<<1/0;
      |        ~^~
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