插入排序（Insert Sort）

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最新推荐文章于 2024-05-28 17:30:50 发布

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分类专栏：数据结构与算法文章标签：插入排序

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本文通过动态图片和伪代码详细解释了插入排序的工作原理及步骤。插入排序是一种简单的排序算法，通过在已排序列表中逐个比较并放置未排序元素来工作。

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Wiki ： http://en.wikipedia.org/wiki/Insertion_sort

看看下面的动态图片，就明白插入排序是怎么回事了：

WiKi上给出的伪代码：

Pseudocode of the complete algorithm follows, where the arrays arezero-based:

 // The values in A[i] are checked in-order, starting at the second one
 for i ← 1 to i ← length(A)-1
   {
     // at the start of the iteration, A[0..i-1] are in sorted order
     // this iteration will insert A[i] into that sorted order
 
     // save A[i], the value that will be inserted into the array on this iteration
     valueToInsert ← A[i]
     // now mark position i as the hole; A[i]=A[holePos] is now empty
     holePos ← i
     // keep moving the hole down until the valueToInsert is larger than 
     // what's just below the hole or the hole has reached the beginning of the array
     while holePos > 0 and valueToInsert < A[holePos - 1]
       { //value to insert doesn't belong where the hole currently is, so shift 
         A[holePos] ← A[holePos - 1] //shift the larger value up
         holePos ← holePos - 1       //move the hole position down
       }
     // hole is in the right position, so put valueToInsert into the hole
     A[holePos] ← valueToInsert
     // A[0..i] are now in sorted order
   }