Selection algorithms

Selection algorithm

In computer science, a selection algorithm is an algorithm for finding the kth smallest number in a list or array; such a number is called the kth order statistic. This includes the cases of finding the minimum, maximum, and median elements. There are O(n)-time (worst-case linear time) selection algorithms, and sublinear performance is possible for structured data; in the extreme, O(1) for an array of sorted data. Selection is a subproblem of more complex problems like the nearest neighbor and shortest path problems. Many selection algorithms are derived by generalizing a sorting algorithm, and conversely some sorting algorithms can be derived as repeated application of selection. The simplest case of a selection algorithm is finding the minimum (or maximum) element by iterating through the list, keeping track of the running minimum – the minimum so far – (or maximum) and can be seen as related to the selection sort. Conversely, the hardest case of a selection algorithm is finding the median. In fact, a specialized median-selection algorithm can be used to build a general selection algorithm, as in median of medians. The best-known selection algorithm is Quickselect, which is related to Quicksort; like Quicksort, it has (asymptotically) optimal average performance, but poor worst-case performance, though it can be modified to give optimal worst-case performance as well. (Wikipedia).

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Selection Sort Algorithm

This presentation discusses the selection sort algorithm. Before writing code students should be able to sort an array on paper and show how the array is reorganized after each iteration of the selection sort algorithm. See my web link below. – – – – – – – – – – – – – – – –

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Better played at speeds greater than 1.5x. Thanks to a subscriber for noticing the error in the code and letting me know.

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Related pages

Sorting algorithm | Partial sorting | Selection sort | Lazy evaluation | Median of medians | The Art of Computer Programming | Geometric series | Median | Counting sort | Odds algorithm | Quickselect | List (abstract data type) | Quicksort | Hash table | Radix sort | Online algorithm | Search algorithm | Introsort | Descriptive statistics | Heap (data structure) | Self-balancing binary search tree | Introselect | Order statistic | Amortized analysis | Order statistic tree | Reduction (complexity) | Secretary problem | Algorithm