View Code of Problem 71

#include<iostream>
using namespace std;
int main(){
	int N;
	cin>>N;
	int a[N],b[N];
	float c=0;
	a[0]=2,a[1]=3;
	b[0]=1,b[1]=2;
	for(int i=2;i<N;i++){
		a[i]=a[i-1]+a[i-2];
		b[i]=b[i-1]+b[i-2];
	}
	for(int i=0;i<N;i++){
		c=c+(float)a[i]/b[i];
	}
	printf("%.2f",c);
	
}