{ "data": { "question": { "questionId": "2271", "questionFrontendId": "2149", "categoryTitle": "Algorithms", "boundTopicId": 1223376, "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.

\n\n

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

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

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

\n\n

 

\n

Example 1:

\n\n
\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
\n\n

Example 2:

\n\n
\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
\n\n

 

\n

Constraints:

\n\n\n", "translatedTitle": "按符号重排数组", "translatedContent": "

给你一个下标从 0 开始的整数数组 nums ，数组长度为 偶数 ，由数目相等的正整数和负整数组成。

\n\n

你需要 重排 nums 中的元素，使修改后的数组满足下述条件：

\n\n
    \n\t
  1. 任意 连续 的两个整数 符号相反
    2. \n\t
  2. 对于符号相同的所有整数，保留 它们在 nums 中的 顺序 。
    3. \n\t
  3. 重排后数组以正整数开头。
    4. \n
\n\n

重排元素满足上述条件后，返回修改后的数组。

\n\n

 

\n\n

示例 1：

\n\n
\n输入：nums = [3,1,-2,-5,2,-4]\n输出：[3,-2,1,-5,2,-4]\n解释：\nnums 中的正整数是 [3,1,2] ，负整数是 [-2,-5,-4] 。\n重排的唯一可行方案是 [3,-2,1,-5,2,-4]，能满足所有条件。\n像 [1,-2,2,-5,3,-4]、[3,1,2,-2,-5,-4]、[-2,3,-5,1,-4,2] 这样的其他方案是不正确的，因为不满足一个或者多个条件。 \n
\n\n

示例 2：

\n\n
\n输入：nums = [-1,1]\n输出：[1,-1]\n解释：\n1 是 nums 中唯一一个正整数，-1 是 nums 中唯一一个负整数。\n所以 nums 重排为 [1,-1] 。\n
\n\n

 

\n\n

提示：

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