标签：
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
class Solution {
public:
int titleToNumber(string s) {
int n=s.length();
int i,sum=0;
for(i=0;i<n;i++)
{
sum=sum*26+ s[i]-64;
}
return sum;
}
};
A的ascii: 65
[leetcode] 171. Excel Sheet Column Number
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原文地址：http://www.cnblogs.com/yuchenkit/p/5300847.html
