leetcood学习笔记-171-excel表列序号
题目描述：
方法：
class Solution: def titleToNumber(self, s: str) -> int: num = 0 r = 1 for i in s[::-1]: num +=(ord(i)-64)*r r*=26 return num
题目描述：
方法：
class Solution: def titleToNumber(self, s: str) -> int: num = 0 r = 1 for i in s[::-1]: num +=(ord(i)-64)*r r*=26 return num