Negative To The End

Easy

0/40

Average time to solve is 15m

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Problem statement

You are given an array ‘A’ of size ‘N’ consisting of both negative and positive integers. You need to return an array in which all the negative numbers are at the end of the array, but the relative order of positive and negative elements is the same.

Example:

Input: ‘N’ = 6
‘A’ = [-1, 2, -3, 1, 13, -10]

Output: [2, 1, 13, -1, -3, 10]

Explanation: In the output array, all the negative elements come after positive elements, and we can also see that the order of positive elements and negative elements is the same, i.e., 2 comes before 1 and 13 in the final array because in the array ‘A’, 2 comes before 1 and 13, and for all other elements, this condition follows.

Detailed explanation ( Input/output format, Notes, Images )

Input Format

First-line contains 'T', denoting the number of Test cases.

For each Test case:

The first line contains two integers, ‘N’, denoting the size of the array ‘A’.

The following line contains ‘N’ integers, denoting the array ‘A’.

Output format:

Return an array in which all the negative numbers are at the end of the array, but the relative order of positive and negative elements is the same.

Note:-

You don't need to print anything. Just implement the given function.

Constraints:

1 <= T <= 10
1 <= N <= 10^3
-1e9 <= A[i] <= 10^9, A[i] != 0

Time Limit: 1-sec

Sample Input 1:

2
6
-1 2 -3 1 13 -10

4
-1 -1 -2 -3

Sample Output 1:

2 1 13 -1 -3 -10
-1 -1 -2 -3

Explanation Of Sample Input 1:

For test case 1:

Input: ‘N’ = 6
‘A’ = [-1, 2, -3, 1, 13, -10]

Output: [2, 1, 13, -1, -3, 10]

Explanation: In the output array, all the negative elements come after positive elements, and we can also see that the order of positive elements and negative elements is the same, i.e., 2 comes before 1 and 13 in the final array because in the array ‘A’, 2 comes before 1 and 13, and for all other elements, this condition follows.


For test case 2:

Input: ‘N’ = 4
‘A’ = [-1, -1, -2, -3]

Output: [-1, -1, -2, -3]

Explanation: Since there are no positive elements, all negative elements are already at the end of the array, so there’s no need to change array ‘A’.

Sample Input 2:

Sample Output 2:

1 2 1 3
2 3 -1 -4

Console