171.Excel Sheet Column Number

题目链接：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  *  * */public class ExcelSheetColumnNumber {//1000 / 1000 test cases passed.//Status: Accepted//Runtime: 208 ms//Submitted: 0 minutes ago    static int titleToNumber(String s) {    int colNumber = 0;    int radix = 1;    for (int i = 0; i < s.length(); i++) {colNumber += (s.charAt(s.length() - i - 1) - 'A' + 1) * radix;radix *= 26;}    return colNumber;    }public static void main(String[] args) {System.out.println(titleToNumber("A"));}}