func_code_string: #include <bits/stdc++.h>   using namespace std;   long long k, n, a, b, val;   void solve() {     cin >> k >> n >> a >> b;     k -= a * n;     if (k <= 0) {       k *= -1, k++;       val = (k + a - b - 1) / (a - b);       if (val > n) {         cout << -1 << endl;         return;       }       n -= val;     }     cout << n << endl;   }   int main() {     ios::sync_with_stdio(0);     cin.tie(0);     cout.tie(0);     int t;     cin >> t;     while (t--) solve();     return 0;   }   