[week1] valid-palindrome - gmlwls96

Author: gmlwls96

valid-palindrome/gmlwls96.kt

@@ -0,0 +1,12 @@
+class Solution {
+    fun isPalindrome(s: String): Boolean {
+        val filterStr = s
+            .lowercase()
+            .filter { it in 'a'..'z' }
+        if (filterStr.isEmpty()) return true
+        for (i in 0..filterStr.lastIndex / 2) {
+            if (filterStr[i] != filterStr[filterStr.lastIndex - i]) return false
+        }
+        return true
+    }
+}