168. Excel Sheet Column Title

Description

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

Solution

/**
 * @param {number} n
 * @return {string}
 */
var convertToTitle = function(n) {
    "use strict";
    let result = [];
    while (n) {
        let ch = (n-1) % 26 + "A".charCodeAt();
        result.push(String.fromCharCode(ch));
        n = Math.floor((n-1)/26);
    }
    return result.reverse().join("");
};