168.excel-sheet-column-title.java

/*
 * @lc app=leetcode id=168 lang=java
 *
 * [168] Excel Sheet Column Title
 *
 * https://leetcode.com/problems/excel-sheet-column-title/description/
 *
 * algorithms
 * Easy (29.44%)
 * Likes:    810
 * Dislikes: 164
 * Total Accepted:    182.7K
 * Total Submissions: 620K
 * Testcase Example:  '1'
 *
 * 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"
 *
 */
class Solution {
  public String convertToTitle(int n) {
    StringBuilder sb = new StringBuilder();
    while (n != 0) {
      sb.insert(0, (char)((n-1)%26 + 'A'));
      n = (n-1) / 26;
    }
    return sb.toString();
  }
}