feat: add solution of Excel Sheet Column Title(168) with javascript.

Author: taryn2016

README.md

@@ -91,6 +91,7 @@
 | [155][155-question] | [Min Stack][155-tips]                                        | [Easy][E]   | [✅][155-java] | [✅][155-js] | [✅][155-kotlin] |
 | [160][160-question] | [Intersection of Two Linked Lists][160-tips]                 | [Easy][E]   | [✅][160-java] |              |        -         |
 | [167][167-question] | [Two Sum II - Input array is sorted][167-tips]               | [Easy][E]   |                | [✅][167-js] |        -         |
+| [168][168-question] | [Excel Sheet Column Title][168-tips]                         | [Easy][E]   |                | [✅][168-js] |        -         |
 | [226][226-question] | [Invert Binary Tree][226-tips]                               | [Easy][E]   | [✅][226-java] | [✅][226-js] | [✅][226-kotlin] |
 | [504][504-question] | [Base 7][504-tips]                                           | [Easy][E]   |                |              | [✅][504-kotlin] |
 | [543][543-question] | [Diameter of Binary Tree][543-tips]                          | [Easy][E]   | [✅][543-java] |              | [✅][543-kotlin] |
@@ -290,6 +291,7 @@ commit信息模板: ``feat: add the solution of `Two Sum`(001) with Java``
 [155-question]: https://leetcode.com/problems/min-stack/
 [160-question]: https://leetcode.com/problems/intersection-of-two-linked-lists/
 [167-question]: https://leetcode.com/problems/two-sum-ii-input-array-is-sorted/
+[168-question]: https://leetcode.com/problems/excel-sheet-column-title/
 [226-question]: https://leetcode.com/problems/invert-binary-tree/
 [504-question]: https://leetcode.com/problems/base-7/description/
 [543-question]: https://leetcode.com/problems/diameter-of-binary-tree/
@@ -396,6 +398,7 @@ commit信息模板: ``feat: add the solution of `Two Sum`(001) with Java``
 [155-tips]: ./tips/155/README.md
 [160-tips]: ./tips/160/README.md
 [167-tips]: ./tips/167/README.md
+[168-tips]: ./tips/168/README.md
 [226-tips]: ./tips/226/README.md
 [504-tips]: ./tips/504/README.md
 [543-tips]: ./tips/543/README.md
@@ -472,6 +475,7 @@ commit信息模板: ``feat: add the solution of `Two Sum`(001) with Java``
 [136-js]: ./src/_136/Solution.js
 [155-js]: ./src/_155/Solution.js
 [167-js]: ./src/_167/Solution.js
+[168-js]: ./src/_168/Solution.js
 [226-js]: ./src/_226/Solution.js
 [561-js]: ./src/_561/Solution.js
 [643-js]: ./src/_643/Solution.js

src/_168/Solution.js

@@ -0,0 +1,17 @@
+/**
+ * @param {number} n
+ * @return {string}
+ */
+var convertToTitle = function(n) {
+  let letter = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
+  let lastLetter = n % 26 === 0 ? 'Z' : letter[n % 26 - 1]
+  if(n <= 26) {
+      return lastLetter
+  }
+  let nextLetterIndex = (n - (n % 26 === 0 ? 26 : n % 26))/26
+  if(Math.floor(nextLetterIndex) <= 26) {
+      return letter[Math.floor(nextLetterIndex) - 1] + lastLetter
+  } else {
+      return convertToTitle(Math.floor(n/26)) + lastLetter
+  }
+};

tips/167/README.md

@@ -24,7 +24,7 @@ Explanation: The sum of 2 and 7 is 9. Therefore index1 = 1, index2 = 2.
 ## 思路 1
 
 javascript: 
-```java
+```javascript
 /**
  * @param {number[]} numbers
  * @param {number} target

tips/168/README.md

@@ -0,0 +1,61 @@
+[Excel Sheet Column Title][title]
+
+## Description
+Given a positive integer, return its corresponding column title as appear in an Excel sheet.
+
+
+**Example:**
+
+```
+    1 -> A
+    2 -> B
+    3 -> C
+    ...
+    26 -> Z
+    27 -> AA
+    28 -> AB 
+    ...
+
+    
+    Input: 1
+    Output: "A"
+
+    Input: 28
+    Output: "AB"
+    
+    Input: 701
+    Output: "ZY"
+```
+
+**Tags:**   
+`Array`
+
+## 思路 1
+
+javascript: 
+```javascript
+/**
+ * @param {number} n
+ * @return {string}
+ */
+var convertToTitle = function(n) {
+    let letter = ['A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z']
+    let lastLetter = n % 26 === 0 ? 'Z' : letter[n % 26 - 1]
+    if(n <= 26) {
+        return lastLetter
+    }
+    let nextLetterIndex = (n - (n % 26 === 0 ? 26 : n % 26))/26
+    if(Math.floor(nextLetterIndex) <= 26) {
+        return letter[Math.floor(nextLetterIndex) - 1] + lastLetter
+    } else {
+        return convertToTitle(Math.floor(n/26)) + lastLetter
+    }
+};
+```
+
+## 结语
+   
+如果你同我们一样热爱数据结构、算法、LeetCode，可以关注我们 GitHub 上的 LeetCode 题解：[LeetCode-Solution][ls]
+
+[title]: https://leetcode.com/problems/excel-sheet-column-title/
+[ls]: https://github.com/RichCodersAndMe/LeetCode-Solution