{ "data": { "question": { "questionId": "1730", "questionFrontendId": "1608", "boundTopicId": null, "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.

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

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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.

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Example 1:

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

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\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
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Example 3:

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

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Most standard library headers are already included automatically for your convenience.

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OpenJDK 17 . Java 8 features such as lambda expressions and stream API can be used.

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