|111|[Minimum Depth of Binary Tree](https://leetcode.com/problems/minimum-depth-of-binary-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/MinimumDepthofBinaryTree.java)| O(n)|O(1)~O(h) | Easy| BFS, DFS

|110|[Balanced Binary Tree](https://leetcode.com/problems/balanced-binary-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_110.java)| O(n)|O(1)~O(h) | Easy| DFS

|109|[Convert Sorted List to Binary Search Tree](https://leetcode.com/problems/convert-sorted-list-to-binary-search-tree/)|[Solution](../master/src/main/java/com/fishercoder/solutions/ConvertSortedListtoBinarySearchTree.java)| O(n)|O(h) | Medium | DFS, Recursion

|107|[Binary Tree Level Order Traversal II](https://leetcode.com/problems/binary-tree-level-order-traversal-ii/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_107.java)| O(nlogn)|O(h) | Easy| BFS

|106|[Construct Binary Tree from Inorder and Postorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_106.java)| O(n)|O(n) | Medium| Recursion, Tree

|105|[Construct Binary Tree from Preorder and Inorder Traversal](https://leetcode.com/problems/construct-binary-tree-from-preorder-and-inorder-traversal/)|[Solution](../master/src/main/java/com/fishercoder/solutions/_105.java)| O(n)|O(n) | Medium| Recursion, Tree

public TreeNode sortedArrayToBST(int[] num) {

return rec(num, 0, num.length - 1);