Gnome sort

类别：排序-交换排序
参看 维基百科的定义

 

Gnome sort is a sorting algorithm which is similar to insertion sort, except that moving an element to its proper place is accomplished by a series of swaps, as in bubble sort. The name comes from the supposed behavior of the Dutch garden gnome in sorting a line of flowerpots and is described on Dick Grune's Gnome sort page.

 

using System;using System.Collections.Generic;namespace Com.Colobu.Algorithm.Exchange{ /// <summary> /// <b>Gnome sort</b> is a sorting algorithm which is similar to insertion sort, /// except that moving an element to its proper place is accomplished /// by a series of swaps, as in bubble sort. /// Gnome Sort is based on the technique used by the standard Dutch Garden Gnome. /// Here is how a garden gnome sorts a line of flower pots. /// Basically, he looks at the flower pot next to him and the previous one; /// if they are in the right order he steps one pot forward, /// otherwise he swaps them and steps one pot backwards. /// Boundary conditions: if there is no previous pot, /// he steps forwards; if there is no pot next to him, he is done. /// /// 平均时间复杂度:O(n^2) /// Stability:Yes /// </summary> public class GnomeSortAlgorithm { public static void GnomeSort<T>(IList<T> szArray) where T : IComparable { int i = 1; int j = 2; http://www.colobu.com int count = szArray.Count; while (i < count) { if (szArray[i - 1].CompareTo(szArray[i]) < 0) //for descending sort, reverse the comparison to >= { i = j; j = j + 1; } else { Swap(szArray, i - 1, i); i = i - 1; if (i == 0) { i = j; j = j + 1; } } } } private static void Swap<T>(IList<T> szArray, int i, int j) { T tmp = szArray[i]; szArray[i] = szArray[j]; szArray[j] = tmp; } }}