Algorithmic analysis of full arrangement of strings in js
这篇文章给大家介绍的内容是关于js中字符串的全排列的算法解析,有着一定的参考价值,有需要的朋友可以参考一下。
题目描述
输入一个字符串,按字典序打印出该字符串中字符的所有排列。例如输入字符串abc,则打印出由字符a,b,c所能排列出来的所有字符串abc,acb,bac,bca,cab和cba。
分析
没啥好分析的了,这个题不会,上网查的思路,大概就是:
abc分化为abc、bac、cba(这是0和0交换、0和1交换、0和2交换
第一步得出的abc分化为abc、acb(这是1和1交换、1和2交换
第一步得出的bac分化为bac、bca(这是1和1交换、1和2交换
第一步得出的cba分化为cba、cab(这是1和1交换、1和2交换
代码实现
function Permutation(str) { if(str === null || str === "") return []; var res = []; var index = 0; step(str.split(""), index, res); return res.sort(); } function step(strArr, cur, res) { if(cur === strArr.length-1){ var i = 0, str = ""; while(i < strArr.length){ str += strArr[i++]; } res.push(str); } for(var i = cur;i < strArr.length;i++) { if(strArr[i] === strArr[cur] && i !== cur) continue; swap(strArr, i, cur); step(strArr, cur+1, res); swap(strArr, i, cur); } } function swap(arr, a, b) { var temp = arr[a]; arr[a] = arr[b]; arr[b] = temp; }
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