{ "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
.
Notice that x
does not have to be an element in nums
.
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
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\n1 <= nums.length <= 100
0 <= nums[i] <= 1000
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 。
注意: x
不必 是 nums
的中的元素。
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
是 唯一的 。
\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:
\n\n1 <= nums.length <= 100
0 <= nums[i] <= 1000
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