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168. Excel Sheet Column Title

class Solution:    def convertToTitle(self, n):        """        :type n: int        :rtype: str        """        s=''        while n>26:            yu=n%26            if yu==0:                n=n//26-1                 s+='Z'            else:                n=n//26                s+=chr(64+yu)        s+=chr(64+n)        return s[::-1]

171. Excel Sheet Column Number

class Solution:    def titleToNumber(self, s):        """        :type s: str        :rtype: int        """        n=len(s)        res=0        for i in range(n-1,-1,-1):            res+=(ord(s[n-1-i])-64)*26**i        return res

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