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

int main(){
    long long n, res;
    vector <long long> vt;
    while(cin>>n){
        vt.push_back(n);
    }
    int len = vt.size();

    for(int i = len-1; i >= 0; i--){
        double n = sqrt(vt[i]);
        printf("%0.4lf\n", n);
    }

return 0;
}

Edited by author 07.09.2019 11:05

Edited by author 07.09.2019 11:11

lmao

while(cin>>n) .... Its an infinite loop.

My AC solution also used while (cin >> n)

use EOF for cin

double instead of long long while declaring n and vector.