168. Excel Sheet Column Title

Easy

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"
package leetcode.easy;

public class ExcelSheetColumnTitle {
@org.junit.Test
public void test() {
System.out.println(convertToTitle(1));
System.out.println(convertToTitle(28));
System.out.println(convertToTitle(701));
} public String convertToTitle(int n) {
StringBuffer buffer = new StringBuffer();
while (n > 0) {
n--;
buffer.append((char) ('A' + n % 26));
n /= 26;
}
return buffer.reverse().toString();
}
}

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