500. Keyboard Row
Description
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.
Note that the strings are case-insensitive, both lowercased and uppercased of the same letter are treated as if they are at the same row.
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"
.
Example 1:
Input: words = ["Hello","Alaska","Dad","Peace"]
Output: ["Alaska","Dad"]
Explanation:
Both "a"
and "A"
are in the 2nd row of the American keyboard due to case insensitivity.
Example 2:
Input: words = ["omk"]
Output: []
Example 3:
Input: words = ["adsdf","sfd"]
Output: ["adsdf","sfd"]
Constraints:
1 <= words.length <= 20
1 <= words[i].length <= 100
words[i]
consists of English letters (both lowercase and uppercase).
Solutions
Solution 1
1 2 3 4 5 6 7 8 9 10 11 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 |
|
Solution 2
1 2 3 4 5 6 7 8 9 |
|