백준2292: 벌집

문제

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

문제 풀이

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();

        int cnt = 1;
        int range = 2;

        if (n == 1) {
            System.out.println(1);
        } else {
            while (range <= n) {
                range = range + (6 * cnt);
                cnt++;
            }
            System.out.println(cnt);
        }
    }
}