171. Excel Sheet Column Number

Easy

Given a column title as appear in an Excel sheet, return its corresponding column number.

😇 Solution

O(s)

class Solution:
    def titleToNumber(self, s: str) -> int:
        
        ans = 0
        for i in range(1,len(s)+1):
            ans += (26**(i-1)) * (ord(s[-i])-64)
        return ans