Implement a variant of merge() that merges back to a[ after copying the second half of a[] to aux[] in decreasing order. With this modification, the code that checks if each of the halves has been used up in the inner loop may be removed. The resultant sort is unstable, please note

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Merge sort

Merge Sort recursively sorts a given collection of numbers or elements by using the divide and conquer strategy in less time. It is one of the most used algorithms, with the worst-case time complexity of O (n log n). It was invented by John Von Neumann. The algorithm continuously divides an array into sub-arrays until each sub-array consists of a single element. It then merges those sub-arrays to produce a sorted array.