网易雷火第一题代码

import java.util.ArrayList; import java.util.List; import java.util.Scanner; public class Main1 { public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);  int n = sc.nextInt();  if (n == 0 ) {
            System.out.println(0);  } else {
            List<Integer> list = new ArrayList<>();  for (int i = 0; i < n; i++) { int value = sc.nextInt();  if (!list.contains(value))
                    list.add(value);  }
            System.out.println(list.size());  }
    }
}