You are given an integer array nums and an integer k.
An integer h is called valid if all values in the array that are strictly greater than h are identical.
For example, if nums = [10, 8, 10, 8], a valid integer is h = 9 because all nums[i] > 9 are equal to 10, but 5 is not a valid integer.
You are allowed to perform the following operation on nums:
h that is valid for the current values in nums.i where nums[i] > h, set nums[i] to h.Return the minimum number of operations required to make every element in nums equal to k. If it is impossible to make all elements equal to k, return -1.
\n
Example 1:
\n\nInput: nums = [5,2,5,4,5], k = 2
\n\nOutput: 2
\n\nExplanation:
\n\nThe operations can be performed in order using valid integers 4 and then 2.
\nExample 2:
\n\nInput: nums = [2,1,2], k = 2
\n\nOutput: -1
\n\nExplanation:
\n\nIt is impossible to make all the values equal to 2.
\nExample 3:
\n\nInput: nums = [9,7,5,3], k = 1
\n\nOutput: 4
\n\nExplanation:
\n\nThe operations can be performed using valid integers in the order 7, 5, 3, and 1.
\n\n
Constraints:
\n\n1 <= nums.length <= 100 1 <= nums[i] <= 1001 <= k <= 100给你一个整数数组 nums 和一个整数 k 。
如果一个数组中所有 严格大于 h 的整数值都 相等 ，那么我们称整数 h 是 合法的 。
比方说，如果 nums = [10, 8, 10, 8] ，那么 h = 9 是一个 合法 整数，因为所有满足 nums[i] > 9 的数都等于 10 ，但是 5 不是 合法 整数。
你可以对 nums 执行以下操作：
h ，它对于 当前 nums 中的值是合法的。i ，如果它满足 nums[i] > h ，那么将 nums[i] 变为 h 。你的目标是将 nums 中的所有元素都变为 k ，请你返回 最少 操作次数。如果无法将所有元素都变 k ，那么返回 -1 。
\n\n
示例 1：
\n\n输入：nums = [5,2,5,4,5], k = 2
\n\n输出：2
\n\n解释：
\n\n依次选择合法整数 4 和 2 ，将数组全部变为 2 。
\n示例 2：
\n\n输入：nums = [2,1,2], k = 2
\n\n输出：-1
\n\n解释：
\n\n没法将所有值变为 2 。
\n示例 3：
\n\n输入：nums = [9,7,5,3], k = 1
\n\n输出：4
\n\n解释：
\n\n依次选择合法整数 7 ，5 ，3 和 1 ，将数组全部变为 1 。
\n\n\n
提示：
\n\n1 <= nums.length <= 100 1 <= nums[i] <= 1001 <= k <= 100k",
"Start by performing operations on the highest integer",
"You can perform an operation on the highest integer using the second-highest, an operation on the second-highest using the third-highest, and so forth.",
"The answer is the number of distinct integers in the array that are larger than k."
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