Tree

No.	Title	Solution	Difficulty	TimeComplexity	SpaceComplexity	Favorite	Acceptance
0094	Binary Tree Inorder Traversal		Medium	O(n)	O(1)		65.5%
0095	Unique Binary Search Trees II		Medium				42.2%
0096	Unique Binary Search Trees		Medium	O(n^2)	O(n)		54.2%
0098	Validate Binary Search Tree		Medium	O(n)	O(1)		28.6%
0099	Recover Binary Search Tree		Hard	O(n)	O(1)		42.2%
0100	Same Tree		Easy	O(n)	O(1)		54.0%
0101	Symmetric Tree		Easy	O(n)	O(1)		47.9%
0102	Binary Tree Level Order Traversal		Medium	O(n)	O(1)		56.3%
0103	Binary Tree Zigzag Level Order Traversal		Medium	O(n)	O(n)		49.8%
0104	Maximum Depth of Binary Tree		Easy	O(n)	O(1)		67.8%
0105	Construct Binary Tree from Preorder and Inorder Traversal		Medium				51.4%
0106	Construct Binary Tree from Inorder and Postorder Traversal		Medium				49.3%
0107	Binary Tree Level Order Traversal II		Easy	O(n)	O(1)		54.9%
0108	Convert Sorted Array to Binary Search Tree		Easy	O(n)	O(1)		60.1%
0110	Balanced Binary Tree		Easy	O(n)	O(1)		44.6%
0111	Minimum Depth of Binary Tree		Easy	O(n)	O(1)		39.3%
0112	Path Sum		Easy	O(n)	O(1)		42.2%
0113	Path Sum II		Medium	O(n)	O(1)		48.7%
0114	Flatten Binary Tree to Linked List		Medium	O(n)	O(1)		51.5%
0124	Binary Tree Maximum Path Sum		Hard	O(n)	O(1)		35.3%
0129	Sum Root to Leaf Numbers		Medium	O(n)	O(1)		50.6%
0144	Binary Tree Preorder Traversal		Medium	O(n)	O(1)		57.2%
0145	Binary Tree Postorder Traversal		Medium	O(n)			57.2%
0173	Binary Search Tree Iterator		Medium	O(n)	O(1)		59.7%
0199	Binary Tree Right Side View		Medium	O(n)	O(1)		55.8%
0222	Count Complete Tree Nodes		Medium	O(n)	O(1)		48.9%
0226	Invert Binary Tree		Easy	O(n)	O(1)		66.7%
0230	Kth Smallest Element in a BST		Medium	O(n)	O(1)		62.2%
0235	Lowest Common Ancestor of a Binary Search Tree		Easy	O(n)	O(1)		51.5%
0236	Lowest Common Ancestor of a Binary Tree		Medium	O(n)	O(1)		48.2%
0257	Binary Tree Paths		Easy	O(n)	O(1)		53.3%
0337	House Robber III		Medium				51.7%
0404	Sum of Left Leaves		Easy	O(n)	O(1)		52.2%
0437	Path Sum III		Medium	O(n)	O(1)		48.0%
0508	Most Frequent Subtree Sum		Medium				58.9%
0513	Find Bottom Left Tree Value		Medium				62.4%
0515	Find Largest Value in Each Tree Row		Medium	O(n)	O(n)		62.1%
0563	Binary Tree Tilt		Easy				52.7%
0572	Subtree of Another Tree		Easy				44.5%
0637	Average of Levels in Binary Tree		Easy	O(n)	O(n)		64.6%
0653	Two Sum IV - Input is a BST		Easy				56.2%
0662	Maximum Width of Binary Tree		Medium				40.0%
0684	Redundant Connection		Medium				58.8%
0685	Redundant Connection II		Hard				32.9%
0834	Sum of Distances in Tree		Hard				45.6%
0863	All Nodes Distance K in Binary Tree		Medium				57.6%
0872	Leaf-Similar Trees		Easy				64.6%
0897	Increasing Order Search Tree		Easy				74.4%
0968	Binary Tree Cameras		Hard				38.5%
0979	Distribute Coins in Binary Tree		Medium				69.5%
0993	Cousins in Binary Tree		Easy	O(n)	O(1)		52.3%
1026	Maximum Difference Between Node and Ancestor		Medium				69.2%
1028	Recover a Tree From Preorder Traversal		Hard				70.8%
1110	Delete Nodes And Return Forest		Medium				67.6%
1123	Lowest Common Ancestor of Deepest Leaves		Medium				67.9%
1145	Binary Tree Coloring Game		Medium				51.4%
1302	Deepest Leaves Sum		Medium				84.1%
1305	All Elements in Two Binary Search Trees		Medium				77.8%
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