leetcode: problem

program9.py

class Solution:
    def getHint(self, secret: str, guess: str) -> str:
        d = {}
        bull = 0
        cow = 0
        for i in range(len(secret)):
            if (secret[i] == guess[i]):
                bull += 1
            else:
                if (secret[i] in d):
                    d[secret[i]] += 1
                else:
                    d[secret[i]] = 1
        for i in range(len(guess)):
            if (secret[i] != guess[i]):
                if (d[guess[i]]):
                    d[guess[i]] -= 1
                    cow += 1
                    if (d[guess[i]] == 0):
                        del d[guess[i]]
        st = str(bull) + 'A' + str(cow) + 'B'
        return st


S = Solution()
print(S.getHint('1807', '7810'))