https://github.com/emahtab/excel-sheet-column-number

Find the excel sheet column number
https://github.com/emahtab/excel-sheet-column-number

leetcode maths maths-problem problem-solving

Last synced: 4 months ago
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Find the excel sheet column number

• Host: GitHub
• URL: https://github.com/emahtab/excel-sheet-column-number
• Owner: eMahtab
• Created: 2020-04-23T18:17:09.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-04-23T18:18:52.000Z (about 5 years ago)
• Last Synced: 2025-02-02T03:25:38.515Z (5 months ago)
• Topics: leetcode, maths, maths-problem, problem-solving
• Homepage:
• Size: 1000 Bytes
• Stars: 1
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# 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

Example 2:

Input: "AB"

Output: 28

Example 3:

Input: "ZY"

Output: 701

```

# Implementation :

```java

class Solution {

    public int titleToNumber(String s) {

        if(s == null || s.length() == 0)

            return 0;

        int column = 0;

        int unit = 0;

        for(int i = s.length()-1; i >= 0; i--) {

            char ch = s.charAt(i);

            int value = (ch - 'A') + 1; 

            int pos = (int) Math.pow(26, unit);

            column = column + (pos * value);

            unit++;

        }

        return column;

    }

}

```