Related to question Excel Sheet Column Title
Given a column title as appear in an Excel sheet, return its corresponding column number.
For example:
A -> 1 B -> 2 C -> 3 ... Z -> 26 AA -> 27 AB -> 28
class Solution(object): def titleToNumber(self, s): """ :type s: str :rtype: int """ """ ans = 0 for c in s: n = ord(c)-ord('A')+1 ans = ans*26+n return ans """ #return sum((ord(c)-ord('A')+1)*(26**(len(s)-1-i)) for i,c in enumerate(s)) to_num = lambda c: ord(c)-ord('A')+1 return reduce(lambda x,y: x*26+y, [to_num(c) for c in s])