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171. Excel Sheet Column Number

{leetcode}/problems/excel-sheet-column-number/[LeetCode - Excel Sheet Column Number^]

目前的想法是从右向左计算，可以考虑一下，能否从左向右计算。可以参考： {leetcode}/problems/excel-sheet-column-number/discuss/52091/Here-is-my-java-solution[Here is my java solution - LeetCode Discuss^]。

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
    ...

Example 1:

Input: "A"
Output: 1

Example 2:

Input: "AB"
Output: 28

Example 3:

Input: "ZY"
Output: 701
link:{sourcedir}/_0171_ExcelSheetColumnNumber.java[role=include]