299. Bulls and Cows

刚开始没看懂题目，这个问题很简单的，就是要统计两个数组中，有哪些是位置对，值也对，有哪些是值对，位置不对，没什么难度

class Solution(object):
    def getHint(self, secret, guess):
        """
        :type secret: str
        :type guess: str
        :rtype: str
        """
        A = B = 0
        count_1 = [0] * 10
        count_2 = [0] * 10
        for i in range(len(secret)):
            if secret[i] == guess[i]:
                A += 1
            else:
                s = int(secret[i])
                g = int(guess[i])
                count_1[s] += 1
                count_2[g] += 1
        for i in range(10):
            B += min(count_1[i], count_2[i])
        return str(A) + "A" + str(B) + "B"

class Solution(object):
    def getHint(self, secret, guess):
        """
        :type secret: str
        :type guess: str
        :rtype: str
        """
        A = B = 0
        count = [0] * 10
        for i in range(len(secret)):
            if secret[i] == guess[i]:
                A += 1
            else:
                s = int(secret[i])
                g = int(guess[i])
                if count[s] < 0: 
                    B += 1
                if count[g] > 0:
                    B += 1
                count[s] += 1
                count[g] -= 1
        return str(A) + "A" + str(B) + "B"