Create check-if-word-equals-summation-of-two-words.py

Author: kamyu104

Python/check-if-word-equals-summation-of-two-words.py

@@ -0,0 +1,18 @@
+# Time:  O(n)
+# Space: O(1)
+
+class Solution(object):
+    def isSumEqual(self, firstWord, secondWord, targetWord):
+        """
+        :type firstWord: str
+        :type secondWord: str
+        :type targetWord: str
+        :rtype: bool
+        """
+        def stoi(s):
+            result = 0
+            for c in s:
+                result = result*10 + ord(c)-ord('a')
+            return result
+        
+        return stoi(firstWord) + stoi(secondWord) == stoi(targetWord)