[프로그래머스] 정수 제곱근 판별

링크

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

sol1) 수학

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

long long solution(long long n) {
    long long answer = -1;
    ll temp = sqrt(n);
    if(temp * temp == n){
        answer = (temp + 1) * (temp + 1);   
    }
    return answer;
}