gistfile1.txt

class Solution:
    def minMutation(self, start: str, end: str, bank: List[str]) -> int:
        result = 0

        if end in bank:
            for i in range(len(start)):
                if start[i] != end[i]:
                    result += 1

        return -1 if result == 0 else result

# why 下面的测试会挂掉
"AACCTTGG"
"AATTCCGG"
["AATTCCGG","AACCTGGG","AACCCCGG","AACCTACC"]