update

Author: hellomrsun

README.md

@@ -16,6 +16,9 @@ Solutions in various programming languages are provided. Enjoy it.
 7. [Word Pattern](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/07-Word-Pattern)
 8. [Sum of Root To Leaf Binary Numbers](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/08-Sum-of-Root-To-Leaf-Binary-Numbers)
 9. [Compare Version Numbers](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/09-Compare-Version-Numbers)
+10. [Bulls and Cows](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/10-Bulls-and-Cows)
+11. [Maximum Product Subarray](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/11-Maximum-Product-Subarray)
+12. [Combination Sum III](https://github.com/AlgoStudyGroup/Leetcode/tree/master/September-LeetCoding-Challenge/12-Combination-Sum-III)
 
 ## August LeetCoding Challenge
 Click [here](https://leetcode.com/explore/challenge/card/august-leetcoding-challenge/) for problem descriptions.