Marc Lester Tan

This is another one of those problems that I was able to solve in less than 5 minutes.

class Solution {
    
    var kbChars = arrayOf(
        "qwertyuiop",
        "asdfghjkl",
        "zxcvbnm")
    
    
    fun findWords(words: Array<String>): Array<String> {
        return words.filter { word ->
            var result = false
            kbChars.forEach { chars ->
                result = result or word.all {
                    it.toLowerCase() in chars
                }
            }
            
            result
        }.toTypedArray()
    }
}

Runtime: 132 ms, faster than 100.00% of Kotlin online submissions for Keyboard Row.
Memory Usage: 32.7 MB, less than 100.00% of Kotlin online submissions for Keyboard Row.

It’s a straightforward implementation and I don’t think I need to explain the solution in details.