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#include<bits/stdc++.h>
using namespace std;
int main()
{
    long int q;
    cin>>q;
    for(long int h=0;h<q;h++)
    {
        long long int k,n,a,b,m,l;
        cin>>k>>n>>a>>b;
        m = k;
        int f=0;
        if(b*n >= k)
        {
            cout<<"-1"<<endl;
        }
        else
        {
            for(long long int i=1;i<=n;++i)
            {
                m = m - a;
                //cout<<m<<" " ;
                //cout<<b*(n-i)<<" "<<endl;
                if(b*(n-i)<m)
                {
                    //cout<<"yyyy"<<endl;
                    continue;
                }
                else
                {
                    f=1;
                    cout<<i-1<<endl;
                    break;
                }
            }
            if(f==0)
            {
                cout<<n<<endl;
            }
        }
    }
}

Traceback (most recent call last):
  File "/usr/lib/python3.5/py_compile.py", line 125, in compile
    _optimize=optimize)
  File "<frozen importlib._bootstrap_external>", line 735, in source_to_code
  File "<frozen importlib._bootstrap>", line 222, in _call_with_frames_removed
  File "./prog.py", line 2
    using namespace std;
                  ^
SyntaxError: invalid syntax

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python3.5/py_compile.py", line 129, in compile
    raise py_exc
py_compile.PyCompileError:   File "./prog.py", line 2
    using namespace std;
                  ^
SyntaxError: invalid syntax

Standard output is empty