feat: Add LeetCode242 solution for Valid Anagram

Author: WhiteHyun

valid-anagram/WhiteHyun.swift

@@ -0,0 +1,15 @@
+//
+//  242. Valid Anagram.swift
+//  https://leetcode.com/problems/valid-anagram/description/
+//  Algorithm
+//
+//  Created by 홍승현 on 2024/04/26.
+//
+
+import Foundation
+
+final class LeetCode242 {
+  func isAnagram(_ s: String, _ t: String) -> Bool {
+    Dictionary(s.map { ($0, 1) }, uniquingKeysWith: +) == Dictionary(t.map { ($0, 1) }, uniquingKeysWith: +)
+  }
+}