valid anagram

valid-anagram/Totschka.ts

@@ -0,0 +1,34 @@
+// https://leetcode.com/problems/valid-anagram/
+
+/**
+ * @SC `O(N)`
+ * @TC `O(1)`
+ */
+namespace use_hashmap {
+  function isAnagram(s: string, t: string): boolean {
+    if (s.length !== t.length) {
+      return false;
+    }
+    const counter = {};
+    for (const char of s) {
+      counter[char] = (counter[char] || 0) + 1;
+    }
+    for (const char of t) {
+      if (!counter[char]) {
+        return false;
+      }
+      counter[char] = counter[char] - 1;
+    }
+    return true;
+  }
+}
+
+/**
+ * @SC `O(log(N)^2)`
+ * @TC `O((Nlog(N))^2)`
+ */
+namespace navie_approach {
+  function isAnagram(s: string, t: string): boolean {
+    return [...s].sort().join('') === [...t].sort().join('');
+  }
+}