first problems

hard/1307 Verbal Arithmetic Puzzle/Solution.py

@@ -0,0 +1,35 @@
+class Solution(object):
+    def isSolvable(self, words, result):
+        """
+        :type words: List[str]
+        :type result: str
+        :rtype: bool
+        """
+        self.encode = {}
+        self.avail_keys = [1,2,3,4,5,6,7,8,9,10]
+
+        for c in reversed(result):
+            for i in range(10):
+                self.encode[c]=i
+
+                for word in words:
+                    for l in word:
+                        # print(f"{i} and {l}")
+                        return True
+
+    def is_letter_solvable(self, letters, result: int):
+        # can the letters add up to the result?
+        if len(letters) == 1:
+            if result in self.avail_keys:
+                self.encode[letters[0]] = result
+                self.avail_keys.remove(result)
+                return True
+            else: return False
+        
+        for c in letters:
+            if c in self.encode:
+                i = self.encode[c]
+                return self.is_letter_solvable(letters[1:], result - i)
+            else:
+                for i in self.avail_keys:
+                    pass