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Given an array arr[], its starting position l and its ending position r. Sort the array using merge sort algorithm.
Example 1:
Input: N = 5 arr[] = {4 1 3 9 7} Output: 1 3 4 7 9
Example 2:
Input:
N = 10
arr[] = {10 9 8 7 6 5 4 3 2 1}
Output:
1 2 3 4 5 6 7 8 9 10
Constraints:
1 <= N <= 105
1 <= arr[i] <= 103
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