백준 10870 - Java

 

 

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

public class Fibonacci {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        int N = Integer.parseInt(br.readLine());
        int[] arr = new int[N + 1];
        arr[0] = 0;
        arr[1] = 1;
        
        // N이 0인 경우는 바로 처리
        if (N == 0) {
            System.out.println(0);
            return;
        }

        for (int i = 2; i <= N; i++) {
            arr[i] = arr[i - 1] + arr[i - 2];
        }

        System.out.println(arr[N]);
    }
}