LeetCode-171.Excel Sheet Colunm Number
阿新 • • 發佈:2018-11-16
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
一個找規律的數學題,找找規律就出來了
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; } }