171. Excel Sheet Column Number

题目

Related to question Excel Sheet Column Title

Given a column title as appear in an Excel sheet, return its corresponding column number.

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28

处理26进制，逐个读入字符串中的每一个字符进行处理转换即可

源码

class Solution {
public:
int titleToNumber(string s) {
int sum = 0;
int temp = 0;
for (int i = 0; i < s.length(); ++i) {
temp = s[i] - 'A' + 1;
sum = 26 * sum + temp;
}
return sum;
}
};