[LeetCode 168] Excel Sheet Column Title

문제 바로가기

Description

---

Given an integer columnNumber, return its corresponding column title as it appears in an Excel sheet.

For example:

A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28 
...

Example 1

---

• Input: columnNumber = 1
• Output: “A”

Example 2

---

• Input: columnNumber = 28
• Output: “AB”

Example 3

---

• Input: columnNumber = 701
• Output: “ZY”

Constraints

---

• 1 <= columnNumber <= 2^31 - 1

Code

---

내 제출

---

class Solution {
    public String convertToTitle(int columnNumber) {
        StringBuilder res = new StringBuilder();
        while (columnNumber != 0) {
            --columnNumber;
            res.append((char) ('A' + columnNumber % 26));
            columnNumber /= 26;
        }
        return res.reverse().toString();
    }
}

Runtime	Memory
0 ms	40.9 MB

다른 풀이

---

 class Solution {
    public String convertToTitle(int columnNumber) {
        String result="";
        while(columnNumber>0){
            columnNumber--;
            result=(char)((columnNumber%26)+'A')+result;
            columnNumber/=26;
        }
        return result;
    }
}

Reference

---

• https://github.com/doocs/leetcode/blob/main/solution/0100-0199/0168.Excel%20Sheet%20Column%20Title/Solution.java