Therefore, cost per level stays the same. Merge the two sorted sub arrays into the sorted, full array. A more sophisticated merge sort that optimizes tape and disk drive usage is the polyphase merge sort.

Several in-place variants have been suggested: Algorithm could just copy source arrays in the resulting one in the right order.

More complicated enhancements may include searching for interleaving parts and run merge algorithm for them only. To understand better, look at below diagram which follow above approach. The first call starts off by making 2 calls. Merge two-record sublists from C and D into four-record sublists; writing these alternately to A and B.

Entries in L and R with slashes have been copied back into A. Each of these 2 calls in-turn make 2 more calls which makes it 4.

Introduce write-index k to store position of the first free cell in the resulting array. The excessive copying mentioned previously is also mitigated, since the last pair of lines before the return result statement function merge in the pseudo code above become superfluous. We pick the current begin index position element of left array i.

Enhancements Algorithm could be enhanced in many ways.

The following figure Figure: The below diagram in step 5 has the result array and index position after step 4 is complete. Succeeding parts show the situation at the start of successive iterations.

Rest of the below steps are repeat of the above 2 steps till we reach the end of leftArray in this case, since leftArray has less number of elements than rightArray - So feel free to skip rest of the steps and go directly to Step 7.

Lets try to code that first A. The below diagram we copy pending element rightArray[3] of value 8 to the resultArray and increment the rightArrayBegin index to 4. Merge Sort algorithm Here is how merge sort is often explained.

It could save up much time, when sizes of merged arrays differ in scores of times. The below diagram in step 8 has the result array and index position after step 7 is complete. Sample merge code Here is a simple code that implements the above sample merge.

But using similar concept they have been able to solve this problem. The merge ends, since there are no more elements to be merged either in the left or the right array.A Simple Merge Sort Its easier to understand merge sort if you try to write a simple code on how you'd merge two sorted arrays into a new array which needs to be in sorted order.

Lets try to code that first Now lets try to implement merge sort algorithm in the simplest possible way as explained above.

The two unsorted lists are sorted by continually calling the merge-sort algorithm; we eventually get a list of size 1 which is already sorted.

The two lists of size 1 are then merged. Algorithm. Code, Example for Defines and provides example of selection sort, bubble sort, merge sort, two way merge sort, quick sort (partition exchange sort) and insertion sort in C++ Programming Related Articles and Code: Algorithms of selection sort, bubble sort, merge sort, quick sort and insertion sort Write a shell script to sort the given.

We now turn our attention to using a divide and conquer strategy as a way to improve the performance of sorting algorithms.

The first algorithm we will study is the merge sort. Merge sort is a recursive algorithm that continually splits a list in half. Merge Sort Program in C - Learn Data Structures and Algorithm using c, C++ and Java in simple and easy steps starting from basic to advanced concepts with examples.

Merge Sort Java Example. By Lokesh Gupta | Filed Under: Algorithms. In below example, we have implemented merge sort algorithm in expressive way to make it more understandable.

Follow comments written above each step/statement in below given merge sort code.

DownloadWrite an algorithm for 2 way merge sort code

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