题解 | #Redraiment的走法#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        ArrayList<Integer> list = new ArrayList<>();
        int max = 1;
        for (int i = 0; i < n; i++) {
            list.add(sc.nextInt());
        }
        int[] dp = new int[n];
        for (int i = 0; i < n; i++) {
            dp[i] = 1;
        }
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < i; j++) {
                if (list.get(j) < list.get(i)) {
                    dp[i] = Math.max(dp[j] + 1, dp[i]);
                    if (max < dp[i]) {
                        max = dp[i];
                    }
                }
            }
        }
        System.out.println(max);
    }
}