These problems are related to tree.

Univalued binary tree - May 27, 2023

Kth largest sum in a binary tree - May 21, 2023

Number of good leaf nodes pairs - May 17, 2023

Diameter of N-ary tree - May 17, 2023

Equal tree partition - May 10, 2023

Increasing order search tree - May 9, 2023

Number of good paths - January 15, 2023

Longest path with different adjacent characters - January 13, 2023

Number of nodes in the sub tree with the same label - January 12, 2023

Minimum time to collect all apples in a tree - January 11, 2023

Two sum bsts - January 1, 2023

Create binary tree from descriptions - December 31, 2022

Convert binary search tree to sorted doubly linked list - December 23, 2022

Flatten a multilevel doubly linked list - December 23, 2022

Sum of distances in tree - December 22, 2022

Find distance in a binary tree - December 21, 2022

Binary tree longest consecutive sequence - December 19, 2022

Clone binary tree with random pointer - December 19, 2022

Root equals sum of children - December 17, 2022

Longest univalue path - December 12, 2022

Lowest common ancestor of deepest leaves - December 12, 2022

Maximum level sum of a binary tree - December 12, 2022

Smallest subtree with all the deepest nodes - December 12, 2022

Maximum product of splitted binary tree - December 10, 2022

Find root of N-ary tree - December 8, 2022

Range sum of bst - December 7, 2022

largest-bst-subtree - December 6, 2022

Path sum IV - December 1, 2022

Count nodes equal to average of subtree - November 30, 2022

Find leaves of binary tree - November 30, 2022

Maximum average subtree - November 30, 2022

Recover a tree from preorder traversal - November 30, 2022

Verify preorder sequence in binary search tree - November 30, 2022

Count univalue subtrees - November 29, 2022

Inorder successor in BST - November 29, 2022

Binary tree vertical order traversal - November 28, 2022

Count nodes equal to sum of descendants - November 28, 2022

Validate binary tree nodes - November 28, 2022

Binary tree upside down - November 27, 2022

Linked list in binary tree - November 21, 2022

All nodes distance k in binary tree - November 20, 2022

Symmetric tree - November 17, 2022

Construct binary search tree from preorder traversal - November 16, 2022

Delete nodes and return forest - November 16, 2022

Insert into a binary search tree - November 16, 2022

Path in zigzag labelled binary tree - November 16, 2022

Trim a binary search tree - November 16, 2022

Binary tree tilt - November 15, 2022

Find duplicate subtrees - November 15, 2022

Find mode in binary search tree - November 15, 2022

Maximum width of binary tree - November 15, 2022

Most frequent subtree sum - November 15, 2022

Path sum III - November 15, 2022

Leaf similar trees - November 12, 2022

Check completeness of a binary tree - November 6, 2022

Minimum absolute difference in bst - November 1, 2022

Search in a binary search tree - October 29, 2022

All elements in two binary search trees - October 28, 2022

Reverse odd levels of binary tree - October 25, 2022

Serialize and deserialize bst - October 25, 2022

Delete leaves with a given value - October 16, 2022

Convert bst to greater tree - October 9, 2022

Find bottom left tree value - October 9, 2022

Flip equivalent binary trees - October 9, 2022

Two sum IV input is a bst - October 9, 2022

Merge two binary trees - October 6, 2022

Add one row to tree - October 5, 2022

Deepest leaves sum - September 17, 2022

Insufficient nodes in root to leaf paths - September 14, 2022

Pseudo palindromic paths in a binary tree - September 14, 2022

Maximum difference between node and ancestor - September 11, 2022

Maximum binary tree II - September 10, 2022

Maximum binary tree - September 10, 2022

Construct string from binary tree - September 7, 2022

Print binary tree - September 7, 2022

Binary tree pruning - September 6, 2022

Amount of time for binary tree to be infected - September 4, 2022

Binary search tree iterator - September 4, 2022

Binary tree level order traversal II - September 4, 2022

Binary tree zigzag level order traversal - September 4, 2022

Construct binary tree from inorder and postorder traversal - September 4, 2022

Convert sorted list to binary search tree - September 4, 2022

Count complete tree nodes - September 4, 2022

delete-node-in-a-bst - September 4, 2022

Populating next right pointers in each node - September 4, 2022

Populating next right pointers in each node II - September 4, 2022

Recover binary search tree - September 4, 2022

Vertical order traversal of a binary tree - September 4, 2022

Balance a binary search tree - September 3, 2022

Average of levels in binary tree - September 2, 2022

Sum root to leaf numbers - September 2, 2022

N-ary tree level order traversal - September 1, 2022

Construct binary tree from preorder and postorder traversal - August 21, 2022

Cousins in binary tree - August 21, 2022

Convert sorted array to binary search tree - August 10, 2022

Binary tree maximum path sum - August 6, 2022

Kth smallest element in a bst - August 6, 2022

Validate binary search tree - August 6, 2022

Serialize and deserialize binary tree - August 6, 2022

My calendar I - August 3, 2022

Flatten binary tree to linked list - July 27, 2022

Count good nodes in binary tree - July 26, 2022

Lowest common ancestor of a binary tree - July 26, 2022

Binary tree inorder traversal - July 20, 2022

Binary tree postorder traversal - July 20, 2022

Binary tree preorder traversal - July 20, 2022

N-ary tree postorder traversal - July 20, 2022

N-ary tree preorder traversal - July 20, 2022

Path sum - July 19, 2022

Find largest value in each tree row - July 18, 2022

Lowest common ancestor of a binary search tree - July 18, 2022

Balanced binary tree - July 14, 2022

Construct binary tree from preorder and inorder traversal - July 14, 2022

Diameter of binary tree - July 14, 2022

Invert binary tree - July 14, 2022

Maximum depth of binary tree - July 14, 2022

Maximum depth of n-ary tree - July 14, 2022

Same tree - July 14, 2022

Subtree of another tree - July 14, 2022

Binary tree level order traversal - July 13, 2022

Binary tree right side view - July 11, 2022