Sunday, November 1, 2015

Zenefits: Excel Sheet Column Number

Related to question Excel Sheet Column Title
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 

Understand the problem:
26-base number to 10-base number.

Code (Java):
public class Solution {
    public int titleToNumber(String s) {
        if (s == null || s.length() == 0) {
            return 0;
        }
        
        int result = 0;
        for (int i = 0; i < s.length(); i++) {
            char c = s.charAt(i);
            int num = c - 'A' + 1;
            
            result = result * 26 + num; 
        }
        
        return result;
    }
}

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