Arrange numbers in the array.py

'''
Problem statement
You have been given an empty array(ARR) and its size N. The only input taken from the user will be N and you need not worry about the array.

Your task is to populate the array using the integer values in the range 1 to N(both inclusive) in the order - 1,3,5,.......,6,4,2.

Note:
You need not print the array. You only need to populate it.
Detailed explanation ( Input/output format, Notes, Images )
Constraints :
1 <= t <= 10^2
0 <= N <= 10^4

Time Limit: 1sec
Sample Input 1 :
1
6
Sample Output 1 :
1 3 5 6 4 2
Explanation of Sample Input 1 :
Since the value of N is 6, the number will be stored in the array in such a fashion that 1 will appear at 0th index, then 2 at the last index, in a similar fashion 3 is stored at index 1. Hence the array becomes 1 3 5 6 4 2.
Sample Input 2 :
2
9
3
Sample Output 2 :
1 3 5 7 9 8 6 4 2
1 3 2
'''


from sys import stdin

def arrange(arr, n) :
    #Your code goes here
    i = 0
    j = n-1
    for x in range(1,n+1):
        if x%2==0:
            arr[j] = x
            j-=1
        else:
            arr[i] = x
            i+=1