[BOJ] 10870 피보나치 수 5 (JAVA)

https://www.acmicpc.net/problem/10870

10870번: 피보나치 수 5

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	
    public static void main(String[] args) throws Exception {

        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        int[] arr = new int[21];
        arr[1] = 1;
        for (int i = 2; i < 21; i++) {
            arr[i] = arr[i - 1] + arr[i - 2];
        }

        System.out.print(arr[N]);

    }
	
}