update doc

jinshendan · jinshendan · commit 04070546ad76 · 2020-05-27T09:47:58.000+02:00
diff --git a/README.md b/README.md
@@ -35,7 +35,7 @@ Recursion
 24. [Construct Binary Search Tree from Preorder Traversal](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/24-Construct-Binary-Search-Tree-From-Preorder-Traversal): Binary Search Tree
 25. [Uncrossed Lines](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/25-Uncrossed-Lines): DP
 26. [Contiguous Array](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/26-Contiguous-Array): Hash Table
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+27. [Possible Bipartition](https://github.com/AlgoStudyGroup/Leetcode/tree/master/May-LeetCoding-Challenge/27-Possible-Bipartition): Bipartite Graph
 
 ## 30-Day (April) LeetCoding Challenge
 
