Excel表列序号

Posted 2022-02-09 Alice_yufeng

class Solution 
    public int titleToNumber(String columnTitle) 
        int number = 0;
        int multiple = 1;
        for (int i = columnTitle.length() - 1; i >= 0; i--) 
            int k = columnTitle.charAt(i) - 'A' + 1;
            number += k * multiple;
            multiple *= 26;
        
        return number;