PAT_B_1060_Java(25分)

第三个测试点有时候会超，可以多提交两遍

import java.io.*;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out=new PrintWriter(new OutputStreamWriter(System.out));
        int N = Integer.parseInt(br.readLine());
        String[] s = br.readLine().trim().split(" ");

        int i = 0;
        for(i = N ; i > 0; i--) {
            int cur = 0;
            for(int j = 0; j < N; j++) {
                if(Integer.parseInt(s[j]) > i)
                    cur++;
            }
            if(cur >= i) {
                break;
            }
        }
        System.out.println(i);
    }
}