add valid-anagram

0242_valid-anagram/python3/nlogn.py

@@ -0,0 +1,13 @@
+# Time: O(NlogN)
+# Space: O(1)
+
+from collections import Counter
+
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+        slen, tlen = len(s), len(t)
+        
+        if slen != tlen:
+            return False
+        
+        return sorted(s) == sorted(t)

0242_valid-anagram/python3/oneliner.py

@@ -0,0 +1,8 @@
+# Time: O(N)
+# Space: O(N)
+
+from collections import Counter
+
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+        return Counter(s) == Counter(t)

0242_valid-anagram/python3/solution.py

@@ -0,0 +1,21 @@
+# Time: O(N) where N is num of chars in string
+# Space: O(N) where N is num of chars in string
+
+from collections import Counter
+
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+        slen, tlen = len(s), len(t)
+        
+        if slen != tlen:
+            return False
+        
+        scounts, tcounts = {}, {}
+        
+        for i in range(slen):
+            sc, tc = s[i], t[i]
+            
+            scounts[sc] = scounts.get(sc, 0) + 1
+            tcounts[tc] = tcounts.get(tc, 0) + 1
+            
+        return scounts == tcounts