Submission #960301

#	Time	Username	Problem	Language	Result	Execution time	Memory
960301		LCJLY	Travelling Merchant (APIO17_merchant)	C++14	100 / 100	142 ms	4372 KiB

merchant

#include <bits/stdc++.h>
using namespace std;	
 
#define int long long 
#define ld long double
#define show(x,y) cout << y << " " << #x << endl;
#define show2(x,y,i,j) cout << y << " " << #x << "  " << j << " " << #i << endl;
#define show3(x,y,i,j,p,q) cout << y << " " << #x << "  " << j << " " << #i << "  " << q << " " << #p << endl;
#define show4(x,y) for(auto it:y) cout << it << " "; cout << #x << endl;
typedef pair<long long,int>pii;
//typedef pair<pii,pii>pi2;
typedef array<int,6>pi2;

mt19937 rng(chrono::system_clock::now().time_since_epoch().count());

void solve(){
	int n,m,k;
	cin >> n >> m >> k;
	
	int arr[n+5][k][2]; //buy sell
	for(int x=1;x<=n;x++){
		for(int y=0;y<k;y++){
			cin >> arr[x][y][0] >> arr[x][y][1];
		}
	}
	
	int adj[n+5][n+5];
	memset(adj,-1,sizeof(adj));
	for(int x=1;x<=n;x++) adj[x][x]=0;
	int temp,temp2,temp3;
	for(int x=0;x<m;x++){
		cin >> temp >> temp2 >> temp3;
		if(adj[temp][temp2]==-1)adj[temp][temp2]=temp3;
		else adj[temp][temp2]=min(adj[temp][temp2],temp3);
	}
	
	for(int i=1;i<=n;i++){
		for(int x=1;x<=n;x++){
			for(int y=1;y<=n;y++){
				if(adj[x][i]==-1||adj[i][y]==-1) continue;
				if(adj[x][y]!=-1&&adj[x][y]<=adj[x][i]+adj[i][y]) continue;
				adj[x][y]=adj[x][i]+adj[i][y];
			}
		}
	}
	
	int add[n+5][n+5];
	memset(add,0,sizeof(add));
	for(int x=1;x<=n;x++){
		for(int y=1;y<=n;y++){
			for(int i=0;i<k;i++){
				if(arr[y][i][1]==-1||arr[x][i][0]==-1) continue;
				add[x][y]=max(add[x][y],arr[y][i][1]-arr[x][i][0]);
			}
			//show3(x,x,y,y,add[x][y],add[x][y]);
		}
	}
	
	int l=1;
	int r=1e13;
	int mid;
	int best=0;
	while(l<=r){
		mid=(l+r)/2;
		int adj2[n+5][n+5];
		for(int x=1;x<=n;x++){
			for(int y=1;y<=n;y++){
				if(x==y||adj[x][y]==-1) adj2[x][y]=-1e13;
				else{
					adj2[x][y]=add[x][y]-mid*min(adj[x][y],(int)1e18/mid);
				}
			}
		}
		
		for(int i=1;i<=n;i++){
			for(int x=1;x<=n;x++){
				for(int y=1;y<=n;y++){
					if(adj2[x][y]>=adj2[x][i]+adj2[i][y]) continue;
					adj2[x][y]=adj2[x][i]+adj2[i][y];
				}
			}
		}
		
		bool amos=false;
		for(int x=1;x<=n;x++){
			if(adj2[x][x]>=0) amos=true;
		}
		
		if(amos){
			best=mid;
			l=mid+1;
		}
		else r=mid-1;
	}
	cout << best;
}
 
int32_t main(){
	ios::sync_with_stdio(0);
	cin.tie(0);
	int t=1;
	//cin >> t;
	while(t--){
		solve();
	}
}

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