README.md

500. Keyboard Row

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:

1. You may use one character in the keyboard more than once.
2. You may assume the input string will only contain letters of alphabet.

Solutions (Python)

1. Set

class Solution:
    def findWords(self, words: List[str]) -> List[str]:
        result = []
        row_q = set("qwertyuiop")
        row_a = set("asdfghjkl")
        row_z = set("zxcvbnm")
        for word in words:
            word_set = set(word.lower())
            if word_set <= row_q or word_set <= row_a or word_set <= row_z:
                result.append(word)
        return result