Given a List of words, return the words that can be typed using letters of alphabet on only one row's of American keyboard like the image below.
Example 1:
Input: ["Hello", "Alaska", "Dad", "Peace"] Output: ["Alaska", "Dad"]Note:
You may use one character in the keyboard more than once.You may assume the input string will only contain letters of alphabet.思路：给定一串单词，找出其中所有字母都来自键盘上的同一行的单词。详情直接看代码，代码借鉴的网上的，写得很不错。注意大小写的统一。
转载于:https://www.cnblogs.com/vincent93/p/6686661.html
