本文精选了多项经典的二叉树算法题目，包括对称二叉树、最大深度、平衡二叉树等，覆盖易到中等难度。通过这些题目可以帮助读者深入理解二叉树的性质及操作。
101. Symmetric Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80228022
104. Maximum Depth of Binary Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215507
108. Convert Sorted Array to Binary Search Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80217357
110. Balanced Binary Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80228085
111. Minimum Depth of Binary Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215886
112. Path Sum【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215958
226. Invert Binary Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215561
235. Lowest Common Ancestor of a Binary Search Tree【Medium】
https://blog.youkuaiyun.com/leel0330/article/details/80221479
257. Binary Tree Paths【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80228058
437. Path Sum III【Medium】
https://blog.youkuaiyun.com/leel0330/article/details/80228150
543. Diameter of Binary Tree 【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80217384
572. Subtree of Another Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80227995
606. Construct String from Binary Tree【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215716
617. Merge Two Binary Trees 【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215444
653. Two Sum IV - Input is a BST【Easy】
https://blog.youkuaiyun.com/leel0330/article/details/80215612
687. Longest Univalue Path【Medium】
https://blog.youkuaiyun.com/leel0330/article/details/80217455
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