[Guidance] What's the method to get precision till decimal place defined by user ?

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1

I am working on this problem LMA1

I tried this method from the editorial. Why am I getting WA ?

#include<bits/stdc++.h>
using namespace std;

int main(){
ios::sync_with_stdio(0);
double t,a,n,p,d,q;
cin>>t;
while(t--){
	cin>>a>>p>>q>>d;
	cout<<setprecision(d)<<(p*a*(1-a)+(q*a))/((1-a)*(1-a))<<endl;
	
}

return 0;
}
2

You can’t solve it in this way; precision of standard C++ data types is far from 10000 digits :slight_smile:

Check editorial (and codes provided there) once again to get the idea how to calcualte digits of common fraction one by one.

3

Can you tell me why my code is not accepted please ? :slight_smile:

4

Kinda obvious answer - because it gives wrong answer.

I already said it in my message above.

1 Like
5

try writing cout<<fixed<<setprecision(d)<<… instead of only cout<<setprecesion(d)<<…

6

try writing cout<<fixed<<setprecision(d)<<…instead of cout<<setprecision(d)<<…