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
Credits:
Special thanks to @ts for adding this problem and creating all test cases.
这题实际上相当于一种二十六进制转十进制的问题，并不难，只要一位一位的转换即可。代码如下：
class Solution {
public:
int titleToNumber(string s) {
int n = s.size();
int res = 0;
int tmp = 1;
for (int i = n; i >= 1; --i) {
res += (s[i - 1] - 'A' + 1) * tmp;
tmp *= 26;
}
return res;
}
};
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