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lofayo
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webJsAlgorithm
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webJsAlgorithm
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deep-algorithm
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3-insertSort.js
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webJsAlgorithm
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deep-algorithm
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3-insertSort.js
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/*
* @Author: fangyong luo
* @Date: 2024-08-28 10:39:38
* @Description: 类似于打扑克牌时,将取到的牌插入到之前有序牌中的对应位置
* 从后往前比较,找到适合位置同时,挪动元素腾出空位,然后在空位放上该元素
* 从第二个元素开始,从后往前比较,比较次数分别为:1 + 2 + 3 + ... + n-1,因此算法时间复杂度为O(n^2)
* 只是插入元素,如果元素相同,小于比较,也不会改变相同元素的顺序,因此是稳定算法
*
* 时间复杂度:O(n^2)
* 稳定性:稳定
* 排序方式:原地(in place)
* 空间复杂度:O(1)
*/
const randomArr = require('../randomArr.js');
function insertSort(arr = randomArr) {
arr = [...arr];
for(let i = 1; i < arr.length; i++) {
const current = arr[i];
let j = i - 1;
while(j >= 0 && arr[j] > current) {
arr[j+1] = arr[j];
j--;
}
arr[j+1] = current;
}
return arr;
}
console.log(randomArr, insertSort());
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