Create 433.py

Author: Chiki1601

101-500/433.py

@@ -0,0 +1,38 @@
+class Solution(object):
+    def canMutation(self, w, d, c, q):
+        l = ["A",'C','G','T']
+        for i in range(len(w)):
+            for j in l:
+                if w[i] != j:
+                    v = w[:i] + j + w[i + 1:]
+                    if v in d and (d[v] == 0 or d[v] > c + 1):
+                        d[v] = c + 1
+                        q.append(v)
+
+    def minMutation(self, start, end, bank):
+        """
+        :type start: str
+        :type end: str
+        :type bank: List[str]
+        :rtype: int
+        """
+        if end not in bank:
+            return -1
+        dic = {}
+        count = 0
+        for i in bank:
+            dic[i] = count
+        queue = [start]
+        while len(queue) > 0:
+            q2 = []
+            for i in queue:
+                self.canMutation(i, dic, count, q2)
+            if dic[end] != 0:
+                break
+            queue = q2
+            q2 = []
+            count += 1
+        # print dic
+        if dic[end] == 0:
+            return -1
+        return dic[end]