Description
Related to question
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
Iterative
從前向后遍歷葬燎，做進(jìn)制轉(zhuǎn)換本讥。
class Solution {
public int titleToNumber(String s) {
int num = 0;
for (int i = 0; i < s.length(); ++i) {
num = num * 26 + (s.charAt(i) - 'A' + 1);
}
return num;
}
}
