第二题我是这么写的 public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int n = scanner.nextInt(); int x = scanner.nextInt(); int[] a = new int[n]; for (int i = 0; i < n; i++) { a[i] = scanner.nextInt(); } Arrays.sort(a); int count = 0; for (int i = n - 1; i >= 0; i--) { if (a[i] >= a[n-x] && a[i] > 0) { count++; } } System.out.println(count); scanner.close(); }