171. Excel Sheet Column Number

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

题目大意:

相关题目:Excel 表格列标题

给定一个出现在Excel表格中的列标题,返回其对应的列号。

样例如题目描述。

解题方法:

水题,26进制转化为10进制

注意事项:

C++代码:

 class Solution {
public:
int titleToNumber(string s) {
int ret=;
for(int i=;i<s.size();i++)
{
ret=ret*+(s[i]-'A'+);
}
return ret;
}
};

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