[Programmers]정수 제곱근 판별

https://school.programmers.co.kr/learn/courses/30/lessons/12934

프로그래머스

#include <string>
#include <vector>
#include <cmath>

using namespace std;

long long solution(long long n) {
    
    long long n_sqrt = sqrt(n);
    
    if(n_sqrt * n_sqrt != n)
        return -1;
    
    
    return (n_sqrt+1) * (n_sqrt+1);
}