Description
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
...
Example
Example 1:
Input: “A”
Output: 1
Example 2:
Input: “AB”
Output: 28
Example 3:
Input: “ZY”
Output: 701
Code
class Solution {
public int titleToNumber(String s) {
int result = 0;
if(s == null || s.length() <=0){
return result;
}
for(int i = 0;i<s.length();i++){
result = result * 26 + (s.charAt(i)-'A'+1);
}
return result;
}
}