[C++] 백준 2292번 : 벌집

https://www.acmicpc.net/problem/2292

#include <iostream>

using namespace std;

int main() {

int n, k = 1;

cin >> n;

while (3 * k*k - 3 * k + 1 < n) {

k++;

}

cout << k << '\n';

}