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
很简单。
public class Solution {
public int titleToNumber(String s) {
int len = s.length();
if (len == 0){
return 0;
}
int num = 0;
for (int i = 0; i < len; i++){
num = num * 26 + s.charAt(i) - 'A' + 1;
}
return num;
}
}