Planning

#include <iostream>
using namespace std;

/* don't criticize, i know how shittty code this is, it could be O(nm) fast but instead its O(n²m²).... and the style is shitty, i know i know) */


int main()
{
    long long int n,b,h,w, cost;
    cin >> n;
    cin >> b;
    cin >> h;
    cin >> w;
    long long int foo [h][w+1]; // cool variable name huh :D
    for (int x = 0; x < h; x++){
        for (int y = 0;y <= w;y++){
            cin >> foo[x][y];
        }
    }



    bool as = false;
    long long  int mincost = b+1; // <= b
    for (int i = 0;i <= h; i++){
        for (int j =1; j <= w; j++){
            if (foo[i][j] >= n) {
                as = true;
                break;
            }
        }
        if (as) {
          cost = foo[i][0] * n;
          if (cost < mincost)
              mincost = cost;
        }
        as = false;
    }
    if (mincost > b)
        cout << "stay home";
    else
        cout << mincost;
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED

Test 31

Verdict: ACCEPTED

Test 32

Verdict: ACCEPTED

Test 33

Verdict: ACCEPTED

Test 34

Verdict: ACCEPTED

Test 35

Verdict: ACCEPTED

Test 36

Verdict: ACCEPTED