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# 168.Excel-Sheet-Column-Title

## 168. Excel Sheet Column Title

## 题目地址

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

## 题目描述

```
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"
```

## 代码

### Approach 1:

```java
class Solution {
    public String convertToTitle(int n) {
        StringBuilder result = new StringBuilder();
      while (n > 0) {
        n--;
        result.insert(0, (char)('A' + n % 26));
        n /= 26;
      }

      return result.toString();
    }
}
```

### Approach #2

```java
public class Solution {
  public String convertToTitle(int n) {
      String res = "";
      while(n != 0) {
          char ch = (char)((n - 1) % 26 + 65);
          n = (n - 1) / 26;
          res = ch + res;
      }
      return res;
  }
}
```