Submission #549932

#	Time	Username	Problem	Language	Result	Execution time	Memory
549932		Hanksburger	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	102 ms	4320 KiB

merchant

#include <bits/stdc++.h>
using namespace std; 
long long buy[105][1005], sell[105][1005], dist[105][105], dist2[105][105], profit[105][105];
int main()
{
	ios::sync_with_stdio(0);
	cin.tie(0);
	cout.tie(0);
	long long n, m, o, l=0, r=1e9;
	cin >> n >> m >> o;
	for (long long i=1; i<=n; i++)
		for (long long j=1; j<=o; j++)
			cin >> buy[i][j] >> sell[i][j];
	for (long long i=1; i<=n; i++)
		for (long long j=1; j<=n; j++)
			dist[i][j]=2e9;
	for (long long i=1; i<=m; i++)
	{
		long long u, v, w;
		cin >> u >> v >> w;
		dist[u][v]=w;
	}
	for (long long i=1; i<=n; i++)
		for (long long j=1; j<=n; j++)
			for (long long k=1; k<=n; k++)
				dist[j][k]=min(dist[j][k], dist[j][i]+dist[i][k]);
	for (long long i=1; i<=n; i++)
		for (long long j=1; j<=n; j++)
			for (long long k=1; k<=o; k++)
				if (buy[i][k]!=-1 && sell[j][k]!=-1)
					profit[i][j]=max(profit[i][j], sell[j][k]-buy[i][k]);
	while (l<r)
	{
		long long mid=(l+r+1)/2;
		for (long long i=1; i<=n; i++)
			for (long long j=1; j<=n; j++)
				dist2[i][j]=dist[i][j]*mid-profit[i][j];
		for (long long i=1; i<=n; i++)
			for (long long j=1; j<=n; j++)
				for (long long k=1; k<=n; k++)
					dist2[j][k]=min(dist2[j][k], dist2[j][i]+dist2[i][k]);
		bool ok=0;
		for (long long i=1; i<=n; i++)
		{
			if (dist2[i][i]<=0)
			{
				ok=1;
				break;
			}
		}
		if (ok)
			l=mid;
		else
			r=mid-1;
	}
	cout << l;
	return 0;
}

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