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,则按字典序打印出由字符a,b,c所能排列出来的所有字符串abc,acb,bac,bca,cab和cba。

输入描述:

输入一个字符串,长度不超过9(可能有字符重复),字符只包括大小写字母。

解答

递归

# coding:utf-8class Solution:    def Permutation(self, ss):        # write code here        if len(ss) == 0:            return []        if len(ss) == 1:            return [ss]        l1 = []        for i in range(len(ss)):            head = ss[i]            for j in self.Permutation(ss[0:i] + ss[i+1:]):                probe = head + j                if probe not in l1:                    l1.append(probe)        return l1 p = Solution()ret = p.Permutation('abc')print ret

结束！