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Alternate positive and negative numbers
Easy Accuracy: 43.03% Submissions: 8719 Points: 2

Given an unsorted array Arr of N positive and negative numbers. Your task is to create an array of alternate positive and negative numbers without changing the relative order of positive and negative numbers.
Note: Array should start with positive number.

 

Example 1:

Input: 
N = 9
Arr[] = {9, 4, -2, -1, 5, 0, -5, -3, 2}
Output:
9 -2 4 -1 5 -5 0 -3 2

Example 2:

Input: 
N = 10
Arr[] = {-5, -2, 5, 2, 4, 7, 1, 8, 0, -8}
Output:
5 -5 2 -2 4 -8 7 1 8 0 


Your Task:  
You don't need to read input or print anything. Your task is to complete the function rearrange() which takes the array of integers arr[] and n as parameters. You need to modify the array itself.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

 

Constraints:
1 ≤ N ≤ 107
-106 ≤ Arr[i] ≤ 107

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Alternate positive and negative numbers

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