added: word pattern

Author: mihirs16

14. Questions/leetcode 290 - word pattern.py

@@ -0,0 +1,26 @@
+# word pattern | leetcode 290 | https://leetcode.com/problems/word-pattern/
+# create a vocabulary to match pattern and a seen hashset to record seen words
+
+class Solution:
+    def wordPattern(self, pattern: str, s: str) -> bool:
+        vocab = dict()
+        seens = dict()
+        sent = s.split(" ")
+        
+        if len(sent) != len(pattern):
+            return False
+
+        for i in range(len(pattern)):
+            i_patt = pattern[i]
+            i_sent = sent[i]
+
+            if vocab.get(i_patt):
+                if vocab[i_patt] != i_sent:
+                    return False
+            else:
+                if seens.get(i_sent):
+                    return False
+                vocab[i_patt] = i_sent
+                seens[i_sent] = True
+
+        return True