Add solution #168

Author: JoshCrozier

README.md

@@ -118,6 +118,7 @@
 152|[Maximum Product Subarray](./0152-maximum-product-subarray.js)|Medium|
 160|[Intersection of Two Linked Lists](./0160-intersection-of-two-linked-lists.js)|Medium|
 167|[Two Sum II - Input Array Is Sorted](./0167-two-sum-ii-input-array-is-sorted.js)|Easy|
+168|[Excel Sheet Column Title](./0168-excel-sheet-column-title.js)|Easy|
 169|[Majority Element](./0169-majority-element.js)|Easy|
 179|[Largest Number](./0179-largest-number.js)|Medium|
 189|[Rotate Array](./0189-rotate-array.js)|Medium|

solutions/0168-excel-sheet-column-title.js

@@ -0,0 +1,19 @@
+/**
+ * 168. Excel Sheet Column Title
+ * https://leetcode.com/problems/excel-sheet-column-title/
+ * Difficulty: Easy
+ *
+ * Given an integer columnNumber, return its corresponding column
+ * title as it appears in an Excel sheet.
+ */
+
+/**
+ * @param {number} columnNumber
+ * @return {string}
+ */
+var convertToTitle = function(columnNumber) {
+  const n = columnNumber - 1;
+  return n >= 0 && n < 26
+    ? String.fromCharCode(65 + n)
+    : convertToTitle(parseInt(n / 26)) + convertToTitle((n % 26) + 1);
+};