LeetCode 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 

 

思路：

相当于26进制转10进制，要注意A从1开始而不是从0开始的边界条件。

 

解法：

public class Solution
{public int titleToNumber(String s){int sum = 0;int temp;for(int i = 0; i < s.length(); i++){temp = s.charAt(i) - 'A' + 1;sum = sum * 26 + temp;}return sum;}
}