leetcode之Excel Sheet Column Number

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 

比較簡單 與excel sheet column title這道 題正好 是反的。之前做過，所以簡單許多，兩次就過了

public static int titleToNumber(String s) {

		int result = 0;
		int s_len = s.length();
		int value;
		for (int i = s_len - 1; i >= 0; i--) {
			value = s.charAt(i) - 64;
			value *= Math.pow(26, s_len - i - 1);
			result += value;
		}
		return result;
	}