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
从左到右，类似于26进制
public class Solution {
public int titleToNumber(String s) {
int res = 0;
for(int i=0; i<s.length(); i++){
char ch = s.charAt(i);
res = res*26 + ch - 'A' + 1;
}
return res;
}
}
