Excel Sheet Column Number
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
Solution
根据题意转换即可
Complexity
时间复杂度 O(n),空间复杂度 O(1)
Code
public class Solution {
public int titleToNumber(String s) {
int res = 0;
if (s.length() == 0) return 0;
for (int i = 0; i < s.length(); ++i) {
res = res * 26 + s.charAt(i) - 'A' + 1;
}
return res;
}
}