题目:
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
解答:
其实质是将26进制数转成十进制数字
class Solution {
public:
int titleToNumber(string s)
{
int num = 0;
int temp = 0;
for (int i = 0; i < s.length(); i++)
{
temp = s[i] - 'A' + 1;
num = 26 * num + temp;
}
return num;
}
};