【LeetCode】171. Excel Sheet Column Number

问题分析

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

代码

class Solution {
public:
    int titleToNumber(string s) {
        int a = 0;
		for (int i = 0; i < s.length(); i++) {
			int t = s[i] - 'A';
			a = a * 26 + t + 1;
		}
		return a;
    }
};