Leetcode - Excel Sheet Column Number

https://leetcode.com/problems/excel-sheet-column-number/

Given 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 -> 28 
    ...

Example 1:

Input: "A"
Output: 1

func titleToNumber(s string) int {
    count := 1
    result := 0
    for i := len(s)-1; i >= 0; i-- {
        num := int(s[i] - 'A') + 1
        result += num * count
        count *= 26
    }
    return result
}

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