# What is merge sort algorithm with example?

## What is merge sort algorithm with example?

An example of merge sort. First divide the list into the smallest unit (1 element), then compare each element with the adjacent list to sort and merge the two adjacent lists. Finally all the elements are sorted and merged. Merge sort is a divide and conquer algorithm that was invented by John von Neumann in 1945.

### What is multiway merge?

In computer science, k-way merge algorithms or multiway merges are a specific type of sequence merge algorithms that specialize in taking in k sorted lists and merging them into a single sorted list. These merge algorithms generally refer to merge algorithms that take in a number of sorted lists greater than two.

#### How does merge sort algorithm work?

Merge sort is one of the most efficient sorting algorithms. It works on the principle of Divide and Conquer. Merge sort repeatedly breaks down a list into several sublists until each sublist consists of a single element and merging those sublists in a manner that results into a sorted list.

**What is iterative merge sort?**

In iterative merge sort, we will divide the elements into equal halves using a recursive approach and then merge them back as a sorted array using the iterative approach.

**What are the four steps of the merge sort algorithm?**

Merge sort

- Consider this unsorted list:
- The list is split into half:
- The process repeats:
- Until all elements are individually separated:
- The process is repeated for the initial right hand division:
- Eventually the list is recompiled.

## What is the best case of merge sort?

n*log(n)

Merge sort/Best complexity

### What is 3 way merge?

A three-way merge is performed after an automated difference analysis between a file “A” and a file “B” while also considering the origin, or common ancestor, of both files “C”. The three-way merge looks for sections which are the same in only two of the three files.

#### How many passes will be needed in the multiway merge process to sort the whole file?

Two-Pass

2-pass multiway merge sort: Traditional sort algorithms (e.g., quick sort) requires that the file must fit in the main memory to be sorted. The Two-Pass Multiway Merge Sort (TPMMS) algorithm can be used to sort files that are larger than the main memory.

**Where is merge sort used?**

Mergesort is used when we want a guaranteed running time of O ( n log n ) O(n \log n) O(nlogn), regardless of the state of the input. Mergesort is a stable sort with a space complexity of O ( n ) O(n) O(n).

**Is merge sort recursive or iterative?**

Merge sort is an efficient sorting algorithm that falls under the Divide and Conquer paradigm and produces a stable sort. It operates by dividing a large array into two smaller subarrays and then recursively sorting the subarrays.

## Why merge sort complexity is Nlogn?

Why is mergesort O(log n)? Mergesort is a divide and conquer algorithm and is O(log n) because the input is repeatedly halved.

### How do you perform a merge sort?

Merge Sort

- Divide the unsorted list into sublists, each containing element.
- Take adjacent pairs of two singleton lists and merge them to form a list of 2 elements. N. will now convert into lists of size 2.
- Repeat the process till a single sorted list of obtained.

#### What is mergemerge sort algorithm?

Merge Sort Algorithm Merge sort is one of the most efficient sorting algorithms. It works on the principle of Divide and Conquer. Merge sort repeatedly breaks down a list into several sublists until each sublist consists of a single element and merging those sublists in a manner that results into a sorted list.

**What is the best algorithm for sorting lists?**

Merge Sort Algorithm. Merge sort is one of the most efficient sorting algorithms. It works on the principle of Divide and Conquer. Merge sort repeatedly breaks down a list into several sublists until each sublist consists of a single element and merging those sublists in a manner that results into a sorted list.

**What is the difference between merge sort and 3-way merge sort?**

Merge sort involves recursively splitting the array into 2 parts, sorting and finally merging them. A variant of merge sort is called 3-way merge sort where instead of splitting the array into 2 parts we split it into 3 parts. Merge sort recursively breaks down the arrays to subarrays of size half.

## What is m in sorting algorithm?

In the algorithm, M signifies the number of disk blocks available in the main memory buffer for sorting. Stage 1: Initially, we create a number of sorted runs. Sort each of them. These runs contain only a few records of the relation. In Stage 1, we can see that we are performing the sorting operation on the disk blocks.