相似题型：LeetCode 168. Excel Sheet Column Title
代码：
class Solution
{
public:
int titleToNumber(string s)
{
int ret = 0;
for (size_t i = 0; i < s.size(); ++ i)
{
ret *= 26;
ret += (s[i] - 'A' + 1);
}
return ret;
}
};LeetCode 171. Excel Sheet Column Number
原文：http://blog.csdn.net/stephen_wong/article/details/43924505