✡ leetcode 171. Excel Sheet Column Number 字母转换为数字 --------- java

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

很简单。

public class Solution {
public int titleToNumber(String s) {
int len = s.length();
if (len == 0){
return 0;
}
int num = 0;
for (int i = 0; i < len; i++){
num = num * 26 + s.charAt(i) - 'A' + 1;
}
return num;
}
}
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