ZJUT_1175

侮辱智商系列17题，第3题

#include<iostream>#include<algorithm>#include<cmath>using namespace std;int main(){double q, n;double sum;cout.precision(3);while(cin>>n>>q) {if(q==1) sum = 1+n;elsesum = (1-pow(q,n+1))/(1-q);cout<<fixed<<sum<<endl;}return 0;}