# What is the best case complexity of merge sort?

## What is the best case complexity of merge sort?

n*log(n)
Merge sort/Best complexity

## In which sorting complexity is same in all cases?

Merge Sort is quite fast, and has a time complexity of O(n*log n) . It is also a stable sort, which means the “equal” elements are ordered in the same order in the sorted list. In this section we will understand why the running time for merge sort is O(n*log n) .

## What is the complexity of merge sort algorithm?

Overall time complexity of Merge sort is O(nLogn). It is more efficient as it is in worst case also the runtime is O(nlogn) The space complexity of Merge sort is O(n). This means that this algorithm takes a lot of space and may slower down operations for the last data sets .

## Is merge sort the fastest in every case?

Question: Of the sorting algorithms we’ve learned (selection sort, insertion sort, and merge sort), is merge sort the fastest in every case? 0 Yes, because merge sort uses divide and conquer. Yes, because merge sort doesn’t look at every element in the array.

## What is the average case complexity of merge sort?

Sorting algorithms

Algorithm Data structure Time complexity:Average
Merge sort Array O(n log(n))
Heap sort Array O(n log(n))
Smooth sort Array O(n log(n))
Bubble sort Array O(n2)

## Is Nlogn faster than N?

No matter how two functions behave on small value of n , they are compared against each other when n is large enough. Theoretically, there is an N such that for each given n > N , then nlogn >= n . If you choose N=10 , nlogn is always greater than n .

## Why is the time complexity of merge sort?

Time Complexity Merge Sort is a recursive algorithm and time complexity can be expressed as following recurrence relation. The time complexity of MergeSort is O(n*Log n) in all the 3 cases (worst, average and best) as the mergesort always divides the array into two halves and takes linear time to merge two halves.

## Is merge sort better than quick?

Merge sort is more efficient and works faster than quick sort in case of larger array size or datasets. Quick sort is more efficient and works faster than merge sort in case of smaller array size or datasets. Sorting method : The quick sort is internal sorting method where the data is sorted in main memory.

## Why is merge sort so fast?

Indeed, it is because merge sort is implemented recursively that makes it faster than the other algorithms we’ve looked at thus far. In part 2 of this series, we’ll look at the runtime complexity of merge sort, how this recursion actually makes it more efficient, and how merge sort stacks up against other algorithms.

## What is the complexity of a merge sort?

The complexity of merge sort, in this case, is Θ (nlogn). 3. Best Case: This is when all the elements are already sorted, but still recursive calls are made thus, complexity is Θ (nlogn).

## Are there any other sorting algorithms on geeksforgeeks?

Other Sorting Algorithms on GeeksforGeeks: 3-way Merge Sort, Selection Sort, Bubble Sort, Insertion Sort, Merge Sort, Heap Sort, QuickSort, Radix Sort, Counting Sort, Bucket Sort, ShellSort, Comb Sort Please write comments if you find anything incorrect, or you want to share more information about the topic discussed above.

## How to calculate merging time in merge sort?

The tree is labeled “Subproblem size” and the right is labeled “Total merging time for all subproblems of this size.” The first level of the tree shows a single node n and corresponding merging time of c times n. The second level of the tree shows two nodes, each of 1/2 n, and a merging time of 2 times c times 1/2 n, the same as c times n.

## Why does merge sort not work in Khan Academy?

During merging, it makes a copy of the entire array being sorted, with one half in lowHalf and the other half in highHalf. Because it copies more than a constant number of elements at some time, we say that merge sort does not work in place.