Update README.md

soapyigu · soapyigu · commit 3f55f1771e38 · 2016-04-07T21:04:29.000-07:00
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 # LeetCode by Swift
 [LeetCode Online Judge] (https://leetcode.com/) is a website contains huge number of algorithm questions. This repo shows my solutions written by Swift. Please feel free to check and if you like it, please STAR to support this repo, thank you!
 
-## Categories
-[Tree](#tree)
+## Contents
+* [Array](#array)
+* [Tree](#tree)
 
 ## Tree
 | Title | Solution | Difficulty |
 | ----- | -------- | ---------- |
-[Same Tree](https://oj.leetcode.com/problems/same-tree/)| [Swift](./Tree/SameTree.swift)|Easy|
+[Same Tree](https://oj.leetcode.com/problems/same-tree/)| [Swift](./Tree/SameTree.swift)| Easy|
+[Symmetric Tree](https://leetcode.com/problems/symmetric-tree/)| [Swift](./Tree/SymmetricTree.swift)| Easy|
+[Invert Binary Tree](https://leetcode.com/problems/invert-binary-tree/)| [Swift](./Tree/InvertBinaryTree)| Easy|
+[Minimum Depth of Binary Tree](https://leetcode.com/problems/minimum-depth-of-binary-tree/)| [Swift](./Tree/MinimumDepthOfBinaryTree.swift)| Easy|
+[Maximum Depth of Binary Tree](https://leetcode.com/problems/maximum-depth-of-binary-tree/)| [Swift](./Tree/MaximumDepthOfBinaryTree.swift)| Easy|
+[Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/)| [Swift](./Tree/BalancedBinaryTree.swift)| Easy|
+[Binary Tree Level Order Traversal](https://leetcode.com/problems/binary-tree-level-order-traversal/)| [Swift](./Tree/BinaryTreeLevelOrderTraversal.swift)| Easy|
+[Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/)| [Swift](./Tree/BinaryTreeLevelOrderTraversalII.swift)| Easy|
+[Binary Tree Zigzag Level Order Traversal](https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/)| [Swift](./Tree/BinaryTreeZigzagLevelOrderTraversal.swift)| Medium|
+[Path Sum](https://leetcode.com/problems/path-sum/)| [Swift](./Tree/PathSum.swift)| Easy|
+[Path Sum II](https://leetcode.com/problems/path-sum-ii/)| [Swift](./Tree/PathSumII.swift)| Medium|
+
+
