[백준] 9237번 이장님 초대 #Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        int N = Integer.parseInt(br.readLine());
        Integer [] arr = new Integer [N];

        StringTokenizer st = new StringTokenizer(br.readLine()," ");
        for (int i = 0; i < N; i++) {
            arr[i] = Integer.parseInt(st.nextToken());
        }
        Arrays.sort(arr, (o1, o2) -> o2-o1);
        System.out.println(solution(N, arr));
    }

    private static int solution(int n, Integer[] arr) {
        int answer = 0;
        for (int i = 0; i < n; i++) {
            answer = Math.max(((i+1)+arr[i]),answer);
        }
        // 묘목을 구입한 날이 1일임으로 1일 더해준다.
        return answer+1;
    }
}