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- #include<bits/stdc++.h>
- using namespace std;
- int main()
- {
- long long int q,n,k,a,b;
- cin>>q;
- while(q--)
- {
- long long ans,x,y,z;
- cin>>k>>n>>a>>b;
- if(k<=n*b)
- {
- ans=-1;
- }
- else
- {
- x=k-(n*b);
- y=(x-1)/(a-b);
- if(y>=0)
- {
- ans=min(n,y);
- }
- else ans=-1;
- }
- cout<<ans<<endl;
- }
- return 0;
- }
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