Submission #773933

#	Time	Username	Problem	Language	Result	Execution time	Memory
773933		Dan4Life	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	110 ms	4160 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int mxN = 105, mxK=1005;
const int INF = 1e18;
int n, m, K, u, v, w;
int b[mxN][mxK], s[mxN][mxK];
int p[mxN][mxN], dis[2][mxN][mxN];

void floydWarshall(int t){
    for(int k = 1; k <= n; k++)
        for(int i = 1; i <= n; i++)
            for(int j = 1; j <= n; j++)
                dis[t][i][j] = min(dis[t][i][j],
                    dis[t][i][k]+dis[t][k][j]);
}

int32_t main(){
    cin >> n >> m >> K;
    memset(dis,63,sizeof(dis));
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= K; j++) 
            cin >> b[i][j] >> s[i][j];
    for(int i = 0; i < m; i++)
        cin>>u>>v>>w,dis[0][u][v]=w;
    floydWarshall(0);
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= n; j++)
            for(int k = 1; k <= K; k++)
                if(min(b[i][k],s[j][k])>=0) 
                    p[i][j]=max(p[i][j],s[j][k]-b[i][k]);
    int l = 0, r = 1e9;
    while(l<r){
        int mid = (l+r+1)/2, ok=0;
        for(int i = 1; i <= n; i++)
            for(int j = 1; j <= n; j++)
                dis[1][i][j]=-p[i][j]+mid*
                    min(INF/mid,dis[0][i][j]);
        floydWarshall(1);
        for(int i = 1; i <= n;i++) 
            if(dis[1][i][i]<=0) ok=1;
        if(ok) l=mid;
        else r=mid-1;
    }
    cout << l;
}

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