#include <bits/stdc++.h> using namespace std; int main(){ int a[100]; a[0]=1; a[1]=2; for(int i=2;i<100;i++){ a[i]=a[i-1]+a[i-2]; } int n; cin>>n; double sum=0; for(int i=0;i<n;i++){ sum+=1.0*a[i+1]/a[i]; } printf("%.6lf",sum); } |
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