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Kotlin-based LeetCode algorithm problem solutions, regularly updated
171\. Excel Sheet Column Number
Easy
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"]`.