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                # Selection Sort - 選擇排序 核心:不斷地選擇剩余元素中的最小者。 1. 找到數組中最小元素并將其和數組第一個元素交換位置。 1. 在剩下的元素中找到最小元素并將其與數組第二個元素交換,直至整個數組排序。 性質: - 比較次數=(N-1)+(N-2)+(N-3)+...+2+1~N^2/2 - 交換次數=N - 運行時間與輸入無關 - 數據移動最少 下圖來源為 [File:Selection-Sort-Animation.gif - IB Computer Science](http://wiki.ibcsstudent.org/index.php?title=File:Selection-Sort-Animation.gif) ![Selection Sort](https://box.kancloud.cn/2015-10-24_562b1f3177b83.gif) ### Implementation ### Python ~~~ #!/usr/bin/env python def selectionSort(alist): for i in xrange(len(alist)): print(alist) min_index = i for j in xrange(i + 1, len(alist)): if alist[j] < alist[min_index]: min_index = j alist[min_index], alist[i] = alist[i], alist[min_index] return alist unsorted_list = [8, 5, 2, 6, 9, 3, 1, 4, 0, 7] print(selectionSort(unsorted_list)) ~~~ ### Java ~~~ public class Sort { public static void main(String[] args) { int unsortedArray[] = new int[]{8, 5, 2, 6, 9, 3, 1, 4, 0, 7}; selectionSort(unsortedArray); System.out.println("After sort: "); for (int item : unsortedArray) { System.out.print(item + " "); } } public static void selectionSort(int[] array) { int len = array.length; for (int i = 0; i < len; i++) { for (int item : array) { System.out.print(item + " "); } System.out.println(); int min_index = i; for (int j = i + 1; j < len; j++) { if (array[j] < array[min_index]) { min_index = j; } } int temp = array[min_index]; array[min_index] = array[i]; array[i] = temp; } } } ~~~ ### Reference - [選擇排序 - 維基百科,自由的百科全書](http://zh.wikipedia.org/wiki/%E9%80%89%E6%8B%A9%E6%8E%92%E5%BA%8F) - [The Selection Sort — Problem Solving with Algorithms and Data Structures](http://interactivepython.org/runestone/static/pythonds/SortSearch/TheSelectionSort.html)
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