617. Merge Two Binary Trees

先序遍历，递归

先序遍历，非递归

669. Trim a Binary Search Tree

先序遍历，递归

637. Average of Levels in Binary Tree

BFS算法

BFS

DFS算法

DFS

104. Maximum Depth of Binary Tree

DFS

BFS

226. Invert Binary Tree

BFS非递归

递归

606. Construct String from Binary Tree

先序遍历，递归

先序遍历，递归

先序遍历，递归

先序遍历，递归

538. Convert BST to Greater Tree

按右中左的顺序遍历

404. Sum of Left Leaves

递归

非递归

563. Binary Tree Tilt

递归

100. Same Tree

非递归

递归

543. Diameter of Binary Tree

递归算法

递归实现

671. Second Minimum Node In a Binary Tree

递归

108. Convert Sorted Array to Binary Search Tree

递归方法

递归