Leetcode 500 Keyboard Row

Given an array of strings words, return the words that can be typed using letters of the alphabet on only one row of American keyboard like the image below.

In the American keyboard:

• the first row consists of the characters "qwertyuiop",

• the second row consists of the characters "asdfghjkl", and

• the third row consists of the characters "zxcvbnm".

如果字符都在一行中能够打出来，则可以输出这个字符串，如果不行，就不输出这个字符串；

类似官方的解答，将所有的字符所在的行数提前做好，判断是否跟第一个都一样，一样就增加，不一样就false，最后汇总，输出，即可。

Runtime: 0 ms, faster than 100.00% of Java online submissions for Keyboard Row.

Memory Usage: 41.7 MB, less than 11.33% of Java online submissions for Keyboard Row.