![\"American](\"https://assets.leetcode-cn.com/aliyun-lc-upload/uploads/2018/10/12/keyboard.png\")
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.
\n\nIn the American keyboard:
\n\n"qwertyuiop","asdfghjkl", and"zxcvbnm".![\"\"](\"https://assets.leetcode.com/uploads/2018/10/12/keyboard.png\")
\n\n
Example 1:
\n\nInput: words = ["Hello","Alaska","Dad","Peace"]
\n\nOutput: ["Alaska","Dad"]
\n\nExplanation:
\n\nBoth "a" and "A" are in the 2nd row of the American keyboard due to case insensitivity.
Example 2:
\n\nInput: words = ["omk"]
\n\nOutput: []
\nExample 3:
\n\nInput: words = ["adsdf","sfd"]
\n\nOutput: ["adsdf","sfd"]
\n\n
Constraints:
\n\n1 <= words.length <= 201 <= words[i].length <= 100words[i] consists of English letters (both lowercase and uppercase). 给你一个字符串数组 words ，只返回可以使用在 美式键盘 同一行的字母打印出来的单词。键盘如下图所示。
请注意，字符串 不区分大小写，相同字母的大小写形式都被视为在同一行。
\n\n美式键盘 中：
\n\n\"qwertyuiop\" 组成。\"asdfghjkl\" 组成。\"zxcvbnm\" 组成。
\n\n
示例 1：
\n\n输入：words = [\"Hello\",\"Alaska\",\"Dad\",\"Peace\"]
\n\n输出：[\"Alaska\",\"Dad\"]
\n\n解释：
\n\n由于不区分大小写，\"a\" 和 \"A\" 都在美式键盘的第二行。
示例 2：
\n\n输入：words = [\"omk\"]
\n\n输出：[]
\n示例 3：
\n\n输入：words = [\"adsdf\",\"sfd\"]
\n\n输出：[\"adsdf\",\"sfd\"]
\n\n\n
提示：
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"book": null,
"isSubscribed": false,
"isDailyQuestion": false,
"dailyRecordStatus": null,
"editorType": "CKEDITOR",
"ugcQuestionId": null,
"style": "LEETCODE",
"exampleTestcases": "[\"Hello\",\"Alaska\",\"Dad\",\"Peace\"]\n[\"omk\"]\n[\"adsdf\",\"sfd\"]",
"__typename": "QuestionNode"
}
}
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