242-Valid-Anagram.kt

class Solution {
    fun isAnagram(s: String, t: String): Boolean {
        if (s.length != t.length) return false
        val arr = Array(26) {0}
        for (i in s.indices) {
            arr[s[i] - 'a']++
            arr[t[i] - 'a']--
        }
        return arr.all{it == 0}
    }
}