这个比较简单就是按公式就好了
class Solution(object):
def titleToNumber(self, s):
"""
:type s: str
:rtype: int
"""
dic = {}
i = 1
for x in range(ord('A'), ord('Z')+1):
dic[chr(x)] = i
i += 1
if len(s) == 0:
return 0
res = 0
for i in s:
temp = dic[i]
res = res * 26 + temp
return res
