Question

c++ ạ

Answer 1

#include <bits/stdc++.h>

using namespace std;

int n,k;

int main(){

freeopen("Dulich.inp","r",stdin);

freeopen("Dulich.out","w",stdout);

cin>>n>>k;

if ((0<n) && (n<15)) cout<<n*k;

else if ((15<=n) && (n<=30)) cout<<fixed<<setprecision(0)<<n*k*0.9;

else if (n>30) cout<<fixed<<setprecision(0)<<n*k*0.85;

}