[C++] 백준 2292번 : 벌집

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

#include <iostream>

using namespace std;

int main() {

int N;

cin >> N;

int i , group;

i = group = 1;

while (true) {

if (N <= group) break;

group += i * 6;

i++;

}

cout << i;

}