Which sorting algorithm is least efficient when performed on an array in which the values are already in the desired sorted order?
Insertion sort. Insertion sort is a simple sorting algorithm that builds the final sorted array (or list) one item at a time. It is much less efficient on large lists than more advanced algorithms such as quicksort, heapsort, or merge sort.Click to see full answer. Also asked, which sorting algorithm is best if the list…
Insertion sort. Insertion sort is a simple sorting algorithm that builds the final sorted array (or list) one item at a time. It is much less efficient on large lists than more advanced algorithms such as quicksort, heapsort, or merge sort.Click to see full answer. Also asked, which sorting algorithm is best if the list is already sorted?If the list is already sorted there are no swaps and the algorithm will run for only n times.So for the best case:O(n) If the list is sorted in the descending order i.e. it is sorted in the reverse order , it is the worst case and the time complexity is:O(n2) The average time complexity for bubble sort is:O(n2)Similarly, which is the fastest sorting algorithm when the list is nearly sorted? Insertion sort is the clear winner on this initial condition. Bubble sort is fast, but insertion sort has lower overhead. Shell sort is fast because it is based on insertion sort. Merge sort, heap sort, and quick sort do not adapt to nearly sorted data. Keeping this in view, why is insertion sort the most efficient when the input list is almost in sorted order? The reason that insertion sort is faster on sorted or nearly-sorted arrays is that when it’s inserting elements into the sorted portion of the array, it barely has to move any elements at all. As a result, insertion sort on an already-sorted array is linear-time, since it only needs to do one comparison per element.Which is best algorithm for sorting? Quicksort
