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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
一个找规律的数学题,找找规律就出来了
solution:
class Solution {
public int titleToNumber(String s) {
int ans = 0;
char Letter = 'A';
for (int i = 0; i < s.length(); i++) {
double num = Math.pow(26, s.length() - 1 - i);
int p = s.charAt(i) - Letter + 1;
ans += num * p;
}
return ans;
}
}