171. Excel Sheet Column Number

Given a column title as appear in an Excel sheet, return its corresponding column number.For example:A -> 1B -> 2C -> 3…Z -> 26AA -> 27AB -> 28 …Example 1:Input: “A"Output: 1Example 2:Input: “AB"Output: 28Example 3:Input: “ZY"Output: 701难度：easy题目：给定Excel 表单里的一列名，返回其整数表示。思路：26进制Runtime: 1 ms, faster than 100.00% of Java online submissions for Excel Sheet Column Number.Memory Usage: 34.5 MB, less than 86.88% of Java online submissions for Excel Sheet Column Number.class Solution { public int titleToNumber(String s) { int result = 0, scale = 1; for (int i = s.length() - 1; i >= 0; i–) { result += (s.charAt(i) - ‘A’ + 1) * scale; scale *= 26; } return result; }}