17. Letter Combinations of a Phone Number

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Given a digit string, return all possible letter combinations that the number could represent.

A mapping of digit to letters (just like on the telephone buttons) is given below.

这是回溯问题，下面是JavaScript代码编写的递归版和迭代版的代码

17. Letter Combinations of a Phone Number

标签：png   asc   possible   images   alt   ring   map   ping   img   

原文地址：http://www.cnblogs.com/bubbleStar/p/6065101.html