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
"""
tag = {'A':1, 'B':2, 'C':3, 'D':4, 'E':5,
'F':6, 'G':7, 'H':8, 'I':9, 'J':10,
'K':11, 'L':12, 'M':13, 'N':14, 'O':15,
'P':16, 'Q':17, 'R':18, 'S':19, 'T':20,
'U':21, 'V':22, 'W':23, 'X':24, 'Y':25, 'Z':26 }
re = 0
n = len(s)-1
for i in range(len(s)):
re += tag[s[i]] * 26**n
n -= 1
return re