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g2101_2200.s2149_rearrange_array_elements_by_sign.readme.md Maven / Gradle / Ivy

2149\. Rearrange Array Elements by Sign

Medium

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

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

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

Return _the modified array after rearranging the elements to satisfy the aforementioned conditions_.

**Example 1:**

**Input:** nums = [3,1,-2,-5,2,-4]

**Output:** [3,-2,1,-5,2,-4]

**Explanation:** The positive integers in nums are [3,1,2]. 

The negative integers are [-2,-5,-4]. 

The only possible way to rearrange them such that they satisfy all conditions is [3,-2,1,-5,2,-4]. 

Other 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.

**Example 2:**

**Input:** nums = [-1,1]

**Output:** [1,-1]

**Explanation:** 1 is the only positive integer and -1 the only negative integer in nums. 

So nums is rearranged to [1,-1].

**Constraints:**

*   2 <= nums.length <= 2 * 105
*   `nums.length` is **even**
*   1 <= |nums[i]| <= 105
*   `nums` consists of **equal** number of positive and negative integers.