leetcode 171. Excel Sheet Column Number
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 1:
Input: "A"
Output: 1
Example 2:
Input: "AB"
Output: 28
Example 3:
Input: "ZY"
Output: 701
class Solution {
public int titleToNumber(String s) {
if(s.length() == 0) return 0;
if(s.length()>1)
return (s.charAt(0) - 'A'+1)*((int)Math.pow(26,s.length() - 1)) + titleToNumber(s.substring(1));
else return (s.charAt(0) - 'A'+1)*((int)Math.pow(26,s.length() - 1));
}
}
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