{ "data": { "question": { "questionId": "2271", "questionFrontendId": "2149", "boundTopicId": null, "title": "Rearrange Array Elements by Sign", "titleSlug": "rearrange-array-elements-by-sign", "content": "

You are given a 0-indexed integer array nums of even length consisting of an equal number of positive and negative integers.

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You should rearrange the elements of nums such that the modified array follows the given conditions:

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    \n\t
  1. Every consecutive pair of integers have opposite signs.
  2. \n\t
  3. For all integers with the same sign, the order in which they were present in nums is preserved.
  4. \n\t
  5. The rearranged array begins with a positive integer.
  6. \n
\n\n

Return the modified array after rearranging the elements to satisfy the aforementioned conditions.

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Example 1:

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\nInput: nums = [3,1,-2,-5,2,-4]\nOutput: [3,-2,1,-5,2,-4]\nExplanation:\nThe positive integers in nums are [3,1,2]. The negative integers are [-2,-5,-4].\nThe only possible way to rearrange them such that they satisfy all conditions is [3,-2,1,-5,2,-4].\nOther ways such as [1,-2,2,-5,3,-4], [3,1,2,-2,-5,-4], [-2,3,-5,1,-4,2] are incorrect because they do not satisfy one or more conditions.  \n
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Example 2:

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\nInput: nums = [-1,1]\nOutput: [1,-1]\nExplanation:\n1 is the only positive integer and -1 the only negative integer in nums.\nSo nums is rearranged to [1,-1].\n
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Constraints:

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Compiled with clang 11 using the latest C++ 20 standard.

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

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Python 2.7.12.

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Most libraries are already imported automatically for your convenience, such as array, bisect, collections. If you need more libraries, you can import it yourself.

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For Map/TreeMap data structure, you may use sortedcontainers library.

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Note that Python 2.7 will not be maintained past 2020. For the latest Python, please choose Python3 instead.

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C# 10 with .NET 6 runtime

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Node.js 16.13.2.

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Go 1.21

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Python 3.10.

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Scala 2.13.7.

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Kotlin 1.9.0.

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Rust 1.58.1

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PHP 8.1.

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With bcmath module

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TypeScript 5.1.6, Node.js 16.13.2.

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Dart 2.17.3

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