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Last Updated: 28 Jan, 2021

Move All Negative Numbers To Beginning And Positive To End

Easy
Asked in companies
SAP LabsPaytm (One97 Communications Limited)PayU

Problem statement

You are given an array 'ARR' consisting of 'N' integers. You need to rearrange the array elements such that all negative numbers appear before all positive numbers.

Note:
The order of elements in the resulting array is not important.
Example:
Let the array be [1, 2, -3, 4, -4, -5]. On rearranging the array such that all negative numbers appear before all positive numbers we get the resulting array [-3, -5, -4, 2, 4, 1].
Input format:
The very first line of input contains an integer ‘T’ denoting the number of test cases. 

The first line of every test case contains an integer ‘N’ denoting the number of elements present in the array.

The second line of every test case contains ‘N’ space-separated integers denoting the elements present in the array.
Output format:
For each test case, “Yes” is printed if the resulting array is correct otherwise “No”.

Output for each test case is printed on a separate line.
Constraints:
1 <= T <= 10
1 <= N <= 5 * 10^4
-10^5 <= ARR[i] <= 10^5

Where  ‘T’ represents the number of test cases and ‘N’ represents the number of elements present in the array.

Time Limit: 1 sec

Approaches

01 Approach

Approach: A brute force approach could be to just sort the given array in ascending order. This will result in all negative numbers to appear at the beginning and positive number at the end.