LeetCode 168. Excel Sheet Column Title

分析

难度 易

来源

https://leetcode.com/problems/excel-sheet-column-title/

十进制转26进制
注意，z表示26，而非0

题目

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

    1 -> A

    2 -> B

    3 -> C

    ...

    26 -> Z

    27 -> AA

    28 -> AB 

    ...

Example 1:

Input: 1

Output: "A"

Example 2:

Input: 28

Output: "AB"

Example 3:

Input: 701

Output: "ZY"

解答

package LeetCode;

public class L168_ExcelSheetColumnTitle {
    public String convertToTitle(int n) {
        StringBuilder sb=new StringBuilder();
        while(n>0){
            if(n%26!=0){
                sb.append((char)(n%26+64));
                n/=26;
            }
            else{
                sb.append('Z');
                n=n/26-1;
            }
        }
        return sb.reverse().toString();
    }
    public static void main(String[] args){
        L168_ExcelSheetColumnTitle l168=new L168_ExcelSheetColumnTitle();
        System.out.println(l168.convertToTitle(52));
    }
}