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All algorithms have a best, worst and average case. Algorithms that always perform in constant time have a best, worst and average of O(1).

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What is the worst case and best case of bubble sort?

There is no worst case for merge sort. Each sort takes the same amount of steps, so the worst case is equal to the average case and best case. In each case it has a complexity of O( N * log(N) ).


Time complexity of selection sort?

Merge sort (or mergesort) is an algorithm. Algorithms do not have running times since running times are determined by the algorithm's performance/complexity, the programming language used to implement the algorithm and the hardware the implementation is executed upon. When we speak of algorithm running times we are actually referring to the algorithm's performance/complexity, which is typically notated using Big O notation. Mergesort has a worst, best and average case performance of O(n log n). The natural variant which exploits already-sorted runs has a best case performance of O(n). The worst case space complexity is O(n) auxiliary.


What is the big-O worst-case complexity of this algorithm?

Can't say without some detail about the algorithm in question.


What is best and average case of binary search?

Merge sort is O(n log n) for both best case and average case scenarios.


What is worst case and average case complexity of linear search algorithm with explanation?

For a list with n elements, the expected cost is the same as the worst-case cost, which is O(n). The average cost will be O(n/2). However, if the list is ordered by probability and geometrically distributed, the complexity becomes constant, O(1). Compare with a binary search which has a cost of O(log n).

Related Questions

What is the worst case and best case of bubble sort?

There is no worst case for merge sort. Each sort takes the same amount of steps, so the worst case is equal to the average case and best case. In each case it has a complexity of O( N * log(N) ).


What is the memory complexity of quicksort algorithm?

The memory complexity of the quicksort algorithm is O(log n) in the best and average cases, and O(n) in the worst case.


What is the space complexity of quicksort algorithm?

The space complexity of the quicksort algorithm is O(log n) in the best and average cases, and O(n) in the worst case.


What is the difference between best worst and average case complexity of an algorithm?

These are terms given to the various scenarios which can be encountered by an algorithm. The best case scenario for an algorithm is the arrangement of data for which this algorithm performs best. Take a binary search for example. The best case scenario for this search is that the target value is at the very center of the data you're searching. So the best case time complexity for this would be O(1). The worst case scenario, on the other hand, describes the absolute worst set of input for a given algorithm. Let's look at a quicksort, which can perform terribly if you always choose the smallest or largest element of a sublist for the pivot value. This will cause quicksort to degenerate to O(n2). Discounting the best and worst cases, we usually want to look at the average performance of an algorithm. These are the cases for which the algorithm performs "normally."


What is the space complexity of quick sort algorithm?

The space complexity of the quick sort algorithm is O(log n) in the best and average cases, and O(n) in the worst case.


What is the space complexity of the Quick Sort algorithm?

The space complexity of the Quick Sort algorithm is O(log n) in the best and average cases, and O(n) in the worst case.


What is the time complexity of quicksort algorithm?

The time complexity of the quicksort algorithm is O(n log n) in the average case and O(n2) in the worst case.


What is the time complexity of quick sort algorithm?

The time complexity of the quick sort algorithm is O(n log n) in the average case and O(n2) in the worst case.


What is the memory complexity of quick sort algorithm?

The memory complexity of the quick sort algorithm is O(log n) in the best case and O(n) in the worst case.


What is the time and space complexity of the Quick Sort algorithm?

The time complexity of the Quick Sort algorithm is O(n log n) on average and O(n2) in the worst case scenario. The space complexity is O(log n) on average and O(n) in the worst case scenario.


Define worst-case of an algorithm?

Asymptotic


What is the best and worst case time complexity of the Bubble Sort algorithm?

The best-case time complexity of the Bubble Sort algorithm is O(n), where n is the number of elements in the array. This occurs when the array is already sorted. The worst-case time complexity is O(n2), which happens when the array is sorted in reverse order.