Related to question Excel Sheet Column TitleGiven 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 -> 28Credits:
Special thanks to @ts for adding this problem and creating all test cases.
这题可以当作求26进制数来做。 可以用iterative的方法也可以用递归的方法来做
iterative:
class Solution:# @param s, a string# @return an integerdef titleToNumber(self, s):result=0n=len(s)for i in range(n):result=result*26+ord(s[i])-64return resultrecursive:
class Solution:# @param s, a string# @return an integerdef titleToNumber(self, s):if len(s)==1:return ord(s)-64return ord(s[-1])-64+26*self.titleToNumber(s[:-1])总体来说第一种方法速度比第二种要快。
，人生就像是一场旅行，遇到的既有感人的，
