Submission #1276900

#	Time	Username	Problem	Language	Result	Execution time	Memory
1276900		WH8	Travelling Merchant (APIO17_merchant)	C++20	0 / 100	58 ms	2048 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define pll pair<int, int>
#define mp make_pair
#define pb push_back
#define f first
#define s second
#define ld long double
int n,m,k, prof[105][105];
vector<vector<int>> dist(105, vector<int>(105, 1e15));
vector<vector<pll>> dp(105, vector<pll>(105));
vector<vector<pll>> v(105);

signed main(){
	cin>>n>>m>>k;
	for(int i=0;i<n;i++){
		for(int j=0;j<k;j++){
			int a,b;cin>>a>>b;
			v[i].pb({a,b});
		}
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			for(int z=0;z<k;z++){
				if(v[j][z].s==-1 or v[i][z].f == -1)continue;
				prof[i][j]=max(prof[i][j],v[j][z].s-v[i][z].f);
			}
			//~ printf("from %lld to %lld, prof %lld\n", i, j, prof[i][j]);
		}
	}
	//~ for(int i=0;i<n;i++)dist[i][i]=0;
	for(int i=0;i<m;i++){
		int a,b,c;cin>>a>>b>>c;
		a--,b--;
		dist[a][b]=c;
		dist[b][a]=c;
	}
	for(int z=0;z<n;z++){
		for(int j=0;j<n;j++){
			for(int i=0;i<n;i++){
				dist[i][j]=min(dist[i][z]+dist[z][j], dist[i][j]);
			}
		}
	}
	for(int i=0;i<n;i++){
		for(int j=0;j<n;j++){
			dp[i][j]={prof[i][j], dist[i][j]};
		}
	}
	//~ for(int i=0;i<n;i++){
		//~ for(int j=0;j<n;j++){
			//~ cout<<prof[i][j]<<" ";
		//~ }
		//~ cout<<endl;
	//~ }
	//~ cout<<endl;
	//~ for(int i=0;i<n;i++){
		//~ for(int j=0;j<n;j++){
			//~ cout<<dist[i][j]<<" ";
		//~ }
		//~ cout<<endl;
	//~ }
	//~ cout<<endl;
	for(int z=0;z<n;z++){
		for(int j=0;j<n;j++){
			for(int i=0;i<n;i++){
				if(z==i or z==j or i==j)continue;
				if((ld)dp[i][j].f / (ld)(dp[i][j].s) < 
				(ld)(dp[i][z].f+dp[z][j].f)/(ld)(dp[i][z].s+dp[z][j].s)){
					dp[i][j].f=dp[i][z].f+dp[z][j].f;
					dp[i][j].s=dp[i][z].s+dp[z][j].s;
				}
			}
		}
	}
	int ans=0;
	for(int z=0;z<n;z++){
		for(int j=0;j<n;j++){
			for(int i=0;i<n;i++){
				// i > j > z > i;
				ans=max(ans, (dp[i][j].f+dp[j][z].f+dp[z][i].f)/(dp[i][j].s+dp[j][z].s+dp[z][i].s));
			}
		}
	}
	cout<<ans;	
}

• Subtask 1: 0 / 12
• Subtask 2: 0 / 21
• Subtask 3: 0 / 33
• Subtask 4: 0 / 34