Adding Python Solution for 49.Group Anagrams and 242.Valid Anagrams (#135)

* Added Python solution for 242.Valid Anagram

* Added Python solution for 49.Group Anagrams

Author: JoyKrishan

Algorithms/Easy/242_ValidAnagram/Solution.py

@@ -0,0 +1,16 @@
+class Solution:
+    def isAnagram(self, s: str, t: str) -> bool:
+        if len(s) != len(t):
+            return False
+
+        count_t = {}
+        count_s = {}
+        for i in range(len(t)):
+             count_t[t[i]] = count_t.get(t[i], 0) + 1
+             count_s[s[i]] = count_s.get(s[i], 0) + 1
+        
+        for key in count_s.keys():
+            if count_t.get(key) == None or count_t[key] != count_s[key]:
+                return False
+
+        return True 

Algorithms/Medium/49_GroupAnagrams/Solution.py

@@ -0,0 +1,18 @@
+class Solution:
+    def groupAnagrams(self, strs: List[str]) -> List[List[str]]:
+        grp_anagrams = {}
+
+        for string in strs:
+            count = [0] * 26
+
+            for char in string:
+                count[ord(char) - ord("a")] += 1
+            
+            count = tuple(count)
+            
+            if grp_anagrams.get(count) == None:
+                grp_anagrams[count] = []
+            
+            grp_anagrams[count].append(string)
+        
+        return grp_anagrams.values()