Submission #50123

#	Time	Username	Problem	Language	Result	Execution time	Memory
50123		mohammad_kilani	Travelling Merchant (APIO17_merchant)	C++17	100 / 100	346 ms	2068 KiB

merchant

#include <bits/stdc++.h>
using namespace std;
#define mod 1000000007
#define oo 2000000000
const int N = 150 , K = 1100;
long long dist[N][N] , best[N][N]; 
long double cur[N][N]; 
int b[N][K] , s[N][K];
int n , m , k , u , v , w;

bool check(long long mid){
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(i == j) continue;
            cur[i][j] = (long double)dist[i][j] * mid - best[i][j];
        }
    }
    for(int i=1;i<=n;i++)
        cur[i][i] = 1e25;
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            for(int k=1;k<=n;k++){
                cur[j][k] = min(cur[j][k],cur[j][i] + cur[i][k]);
            }
        }
    }
    for(int i=1;i<=n;i++){
        if(cur[i][i] <= 0)
            return true;
    }
    return false;
}

int main() {
    scanf("%d%d%d",&n,&m,&k);
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(i != j)
                dist[i][j] = 1e18;
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=k;j++){
            scanf("%d%d",&b[i][j],&s[i][j]);
        }
    }
    for(int i=0;i<m;i++){
        scanf("%d%d%d",&u,&v,&w);
        dist[u][v] = min(dist[u][v],(long long)w);
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            for(int k=1;k<=n;k++){
                    dist[j][k] = min(dist[j][k],(long long) dist[j][i] + dist[i][k]);
            }
        }
    }
    for(int i=1;i<=n;i++){
        for(int j=1;j<=n;j++){
            if(i == j) continue;
            for(int l=1;l<=k;l++){
                if(b[i][l] != -1 && s[j][l] != -1)
                    best[i][j] = max(best[i][j], (long long)s[j][l] - b[i][l]);
            }
        }
    }
    long long low = 1 , high = 1e11 , ans = 0 , mid = 0;
    while(high >= low){
        mid = (low + high) / 2;
        if(check(mid)){
            ans = mid;
            low = mid + 1;
            continue;
        }
        else
            high = mid - 1;
    }
    cout << ans << endl;
    return 0;
}

Compilation message (stderr)

merchant.cpp: In function 'int main()':
merchant.cpp:35:10: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
     scanf("%d%d%d",&n,&m,&k);
     ~~~~~^~~~~~~~~~~~~~~~~~~
merchant.cpp:44:18: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
             scanf("%d%d",&b[i][j],&s[i][j]);
             ~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
merchant.cpp:48:14: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
         scanf("%d%d%d",&u,&v,&w);
         ~~~~~^~~~~~~~~~~~~~~~~~~

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