[LeetCode]#171 Excel Sheet Column Number

Environment: Python 3.7

Key technique: function ord, 26 Base

Example 1:

Input: "A"
Output: 1

Example 2:

Input: "AB"
Output: 28

Example 3:

Input: "ZY"
Output: 701

Solution:

class Solution:
    def titleToNumber(self, s: str) -> int:
        result=0
        l=len(s)
        for i in range (l):
            result=result*26+ord(s[i])-64
        return result

Submitted result:

Lesson learn:

Use python ord and check base-26.