InfoIn computer science, selection sort is a sorting algorithm, specifically an in-place comparison sort.

Like counting sort, this is an efficient variant if there are many duplicate values.Indeed, selection sort does one pass through the remaining items for each item moved.…

Selection sort can also be used on list structures that make add and remove efficient, such as a linked list.In this case it is more common to remove the minimum element from the remainder of the list, and then insert it at the end of the values sorted so far.…

Shell sort (see below) is a variant of insertion sort that is more efficient for larger lists.Selection sort is an in-place comparison sort.…

Insertion sort's advantage is that it only scans as many elements as needed to determine the correct location of the k+1st element, while selection sort must scan all remaining elements to find the absolute smallest element.Calculations show that insertion sort will usually perform about half as many comparisons as selection sort.Assuming the k+1st element's rank is random, insertion sort will on average require shifting half of the previous k elements, while selection sort always requires scanning all unplaced elements.…

Note, however, that cocktail sort more often refers to a bidirectional variant of bubble sort.Selection sort can be implemented as a stable sort.If, rather than swapping in step 2, the minimum value is inserted into the first position (that is, all intervening items moved down), the algorithm is stable.…

Insertion sort is very similar to selection sort.As in selection sort, after k passes through the array, the first k elements are in sorted order.For selection sort these are the k smallest elements, while in insertion sort they are whatever the first k elements were in the unsorted array.…

Insertion sort is very similar to selection sort.As in selection sort, after k passes through the array, the first k elements are in sorted order.…

Merge sort itself is the standard routine in Perl, among others, and has been used in Java at least since 2000 in JDK1.3.Heapsort is a much more efficient version of selection sort.It also works by determining the largest (or smallest) element of the list, placing that at the end (or beginning) of the list, then continuing with the rest of the list, but accomplishes this task efficiently by using a data structure called a heap, a special type of binary tree.…

A simple example of selection by partial sorting is to use the partial selection sort.

Selection sort is noted for its simplicity, and also has performance advantages over more complicated algorithms in certain situations.The algorithm finds the minimum value, swaps it with the value in the first position, and repeats these steps for the remainder of the list.…

It improves upon the naive selection sort by using a priority queue to find the next element in the sort.

Selection sort is noted for its simplicity, and it has performance advantages over more complicated algorithms in certain situations, particularly where auxiliary memory is limited.The algorithm divides the input list into two parts: the sublist of items already sorted, which is built up from left to right at the front (left) of the list, and the sublist of items remaining to be sorted that occupy the rest of the list.…

As in selection sort, after k passes through the array, the first k elements are in sorted order.For selection sort these are the k smallest elements, while in insertion sort they are whatever the first k elements were in the unsorted array.Insertion sort's advantage is that it only scans as many elements as needed to determine the correct location of the k+1st element, while selection sort must scan all remaining elements to find the absolute smallest element.…

For this reason selection sort may be preferable in cases where writing to memory is significantly more expensive than reading, such as with EEPROM or flash memory.Some divide-and-conquer algorithms such as quicksort and mergesort sort by recursively dividing the list into smaller sublists which are then sorted.…

Assuming the k+1st element's rank is random, insertion sort will on average require shifting half of the previous k elements, while selection sort always requires scanning all unplaced elements.If the input array is reverse-sorted, insertion sort performs as many comparisons as selection sort.If the input array is already sorted, insertion sort performs as few as n-1 comparisons, thus making insertion sort more efficient when given sorted or "nearly sorted" arrays.…

Selection sort is not difficult to analyze compared to other sorting algorithms since none of the loops depend on the data in the array.

A bidirectional variant of selection sort, called cocktail sort, is an algorithm which finds both the minimum and maximum values in the list in every pass.This reduces the number of scans of the list by a factor of 2, eliminating some loop overhead but not actually decreasing the number of comparisons or swaps.…

Thus, if on average there are more than two items with the same value, bingo sort can be expected to be faster because it executes the inner loop fewer times than selection sort.

Other algorithms, such as library sort, a variant of insertion sort that leaves spaces, are also practical for physical use.Two of the simplest sorts are insertion sort and selection sort, both of which are efficient on small data, due to low overhead, but not efficient on large data.Insertion sort is generally faster than selection sort in practice, due to fewer comparisons and good performance on almost-sorted data, and thus is preferred in practice, but selection sort uses fewer writes, and thus is used when write performance is a limiting factor.…