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171. Excel Sheet Column Number

Difficulty Topics

Description

Given a string columnTitle that represents the column title as appears in an Excel sheet, return its corresponding column number.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28 
...

 

Example 1:

Input: columnTitle = "A"
Output: 1

Example 2:

Input: columnTitle = "AB"
Output: 28

Example 3:

Input: columnTitle = "ZY"
Output: 701

 

Constraints:

  • 1 <= columnTitle.length <= 7
  • columnTitle consists only of uppercase English letters.
  • columnTitle is in the range ["A", "FXSHRXW"].

Solution

excel-sheet-column-number.py
class Solution:
    def titleToNumber(self, columnTitle: str) -> int:
        res = 0

        for x in columnTitle:
            res = res * 26 + ord(x) - ord('A') + 1

        return res