Merge Sort

 


Recursive Java program

Iterative Java program (Bottom up)



Improvements

1. Use insertion sort for small subarrays : Mergesort has too much overhead for tiny subarrays. Cutoff to insertion sort for ≈ 7 items. Java program

2. Stop if already sorted : Is biggest item in first half ≤ smallest item in second half? Helps for partially-ordered arrays. Java program

3. Eliminate the copy to the auxiliary array :  Save time (but not space) by switching the role of the input and auxiliary array in each recursive call. Java program






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