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
public class Solution {
public int titleToNumber(String s) {
String source = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
int flag = 0;
int sum = 0;
for (int i = 0; i < s.length(); i++) {
flag = (1+source.indexOf(s.charAt(i)));
sum += flag*Math.pow(26, s.length() - i-1);
}
return sum;
}
}