update 2689

Author: fishercoder1534

Diff for: paginated_contents/algorithms/3rd_thousand/README.md

@@ -25,7 +25,7 @@
 | 2706 | [Buy Two Chocolates](https://leetcode.com/problems/buy-two-chocolates/)                                                                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2706.java)                                       |                                 | Easy                           |
 | 2697 | [Lexicographically Smallest Palindrome](https://leetcode.com/problems/lexicographically-smallest-palindrome/)                                                            | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2697.java)                                       |                                 | Easy                           |
 | 2696 | [Minimum String Length After Removing Substrings](https://leetcode.com/problems/minimum-string-length-after-removing-substrings/)                                                           | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2696.java)                                       |                                 | Easy                           |
-| 2689 | [Extract Kth Character From The Rope Tree](https://leetcode.com/problems/extract-kth-character-from-the-rope-tree/)                                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2689.java)                                       |                                 | Easy                           |
+| 2689 | [Extract Kth Character From The Rope Tree](https://leetcode.com/problems/extract-kth-character-from-the-rope-tree/)                                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2689.java)                                       |                                 | Easy                           | Tree, DFS
 | 2682 | [Find the Losers of the Circular Game](https://leetcode.com/problems/find-the-losers-of-the-circular-game/)                                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2682.java)                                       |                                 | Easy                           |
 | 2673 | [Make Costs of Paths Equal in a Binary Tree](https://leetcode.com/problems/make-costs-of-paths-equal-in-a-binary-tree/)                                                                                     | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2673.java)                                       |                                 | Medium                         |Tree, DFS, Greedy
 | 2678 | [Number of Senior Citizens](https://leetcode.com/problems/number-of-senior-citizens/)                                                                                      | [Java](https://github.com/fishercoder1534/Leetcode/blob/master/src/main/java/com/fishercoder/solutions/thirdthousand/_2678.java)                                       |                                 | Easy                           |