Submission #1073204

#	Time	Username	Problem	Language	Result	Execution time	Memory
1073204		alexdd	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	91 ms	4280 KiB

merchant

#include<bits/stdc++.h>
using namespace std;
#define int long long
const int INF = 1e18;
int n,m,k;
int buy[105][1005],sell[105][1005];
int dist[105][105],profit[105][105],dist2[105][105];
bool verif(int lun)
{
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            dist2[i][j] = min(INF/lun,dist[i][j])*lun - profit[i][j];
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            for(int q=1;q<=n;q++)
                dist2[j][q] = min(dist2[j][q], dist2[j][i] + dist2[i][q]);
    for(int i=1;i<=n;i++)
        if(dist2[i][i]<=0)
            return 1;
    return 0;
}
signed main()
{
    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++)
        {
            dist[i][j]=INF;
            for(int q=1;q<=k;q++)
                if(buy[i][q]!=-1 && sell[j][q]!=-1)
                    profit[i][j] = max(profit[i][j], sell[j][q] - buy[i][q]);
        }
    }
    int u,v,w;
    for(int i=1;i<=m;i++)
    {
        cin>>u>>v>>w;
        dist[u][v]=w;
    }
    for(int i=1;i<=n;i++)
        for(int j=1;j<=n;j++)
            for(int q=1;q<=n;q++)
                dist[j][q] = min(dist[j][q], dist[j][i] + dist[i][q]);
    int st=1,dr=1e9,ans=0;
    while(st<=dr)
    {
        int mij=(st+dr)/2;
        if(verif(mij))
        {
            ans=mij;
            st=mij+1;
        }
        else
            dr=mij-1;
    }
    cout<<ans;
    return 0;
}

• Subtask 1: 12 / 12
• Subtask 2: 21 / 21
• Subtask 3: 33 / 33
• Subtask 4: 34 / 34