{ "data": { "question": { "questionId": "1730", "questionFrontendId": "1608", "categoryTitle": "Algorithms", "boundTopicId": 432800, "title": "Special Array With X Elements Greater Than or Equal X", "titleSlug": "special-array-with-x-elements-greater-than-or-equal-x", "content": "

You are given an array nums of non-negative integers. nums is considered special if there exists a number x such that there are exactly x numbers in nums that are greater than or equal to x.

\n\n

Notice that x does not have to be an element in nums.

\n\n

Return x if the array is special, otherwise, return -1. It can be proven that if nums is special, the value for x is unique.

\n\n

 

\n

Example 1:

\n\n
\nInput: nums = [3,5]\nOutput: 2\nExplanation: There are 2 values (3 and 5) that are greater than or equal to 2.\n
\n\n

Example 2:

\n\n
\nInput: nums = [0,0]\nOutput: -1\nExplanation: No numbers fit the criteria for x.\nIf x = 0, there should be 0 numbers >= x, but there are 2.\nIf x = 1, there should be 1 number >= x, but there are 0.\nIf x = 2, there should be 2 numbers >= x, but there are 0.\nx cannot be greater since there are only 2 numbers in nums.\n
\n\n

Example 3:

\n\n
\nInput: nums = [0,4,3,0,4]\nOutput: 3\nExplanation: There are 3 values that are greater than or equal to 3.\n
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "特殊数组的特征值", "translatedContent": "

给你一个非负整数数组 nums 。如果存在一个数 x ,使得 nums 中恰好有 x 个元素 大于或者等于 x ,那么就称 nums 是一个 特殊数组 ,而 x 是该数组的 特征值

\n\n

注意: x 不必nums 的中的元素。

\n\n

如果数组 nums 是一个 特殊数组 ,请返回它的特征值 x 。否则,返回 -1 。可以证明的是,如果 nums 是特殊数组,那么其特征值 x唯一的

\n\n

 

\n\n

示例 1:

\n\n
输入:nums = [3,5]\n输出:2\n解释:有 2 个元素(3 和 5)大于或等于 2 。\n
\n\n

示例 2:

\n\n
输入:nums = [0,0]\n输出:-1\n解释:没有满足题目要求的特殊数组,故而也不存在特征值 x 。\n如果 x = 0,应该有 0 个元素 >= x,但实际有 2 个。\n如果 x = 1,应该有 1 个元素 >= x,但实际有 0 个。\n如果 x = 2,应该有 2 个元素 >= x,但实际有 0 个。\nx 不能取更大的值,因为 nums 中只有两个元素。
\n\n

示例 3:

\n\n
输入:nums = [0,4,3,0,4]\n输出:3\n解释:有 3 个元素大于或等于 3 。\n
\n\n

示例 4:

\n\n
输入:nums = [3,6,7,7,0]\n输出:-1\n
\n\n

 

\n\n

提示:

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