Tree

1. Self balancing tree AVL tree - AVLTree.java
2. Given an arbitrary binary tree, convert it to a binary tree that holds Children Sum Property. You can only increment data values in any node - ArbitaryTreeToChildSumTree.java
3. Given Preorder traversal of a BST, check if each non-leaf node has only one child. Assume that the BST contains unique entries - BSTOneChildPreOrderTraversal.java
4. Btree implementation - BTree.java
5. Binary tree operations - BinaryTree.java
6. Convert a binary tree to circular link list - BinaryTreeToCircularLinkList.java
7. Write a function to connect all the adjacent nodes at the same level in a binary tree - ConnectNodesAtSameLevel.java
8. Given two arrays that represent preorder and postorder traversals of a full binary tree, construct the binary tree - ConstructFullTreeFromPreOrderPostOrder.java
9. Construct tree from preorder and inorder traversal - ConstructTreeFromInOrderPreOrder.java
10. Given inorder and level-order traversals of a Binary Tree, construct the Binary Tree - ConstructTreeFromLevelOrderInOrder.java
11. Write a function to count number of smaller elements on right of each element in an array - CountNumberOfSmallerElementOnRight.java
12. Given binary tree and two nodes, tell if these two nodes are cousins of each other or not - CousinNodes.java
13. Diameter of binary tree - DiameterOfTree.java
14. Huffman encoding - HuffmanEncoding.java
15. Given two arrays which represent a sequence of keys. Imagine we make a Binary Search Tree (BST) from each array. We need to tell whether two BSTs will be identical or not without actually constructing the tree - IdenticalTrees.java
16. Given a binary tree, find largest BST in this binary tree - LargestBSTInBinaryTree.java
17. Given a Binary Tree, find size of the Largest Independent Set(LIS) in it. A subset of all tree nodes is an independent set if there is no edge between any two nodes of the subset - LargestIndependentSetInTree.java
18. Level order traversal of binary tree - LevelOrderTraversal.java
19. Create an iterator to traverse a binary tree. When the next function is called on the binary tree return the value at the next node as if you are doing an inorder traversal of the tree - NextInorderSuccessorIterator.java
20. Given a binary tree and a number k, print nodes at distance k from given node - NodesAtDistanceK.java
21. Populate inorder successor for all nodes - PopulateInOrderSuccessor.java
22. Inorder successor of two tree -NextInorderSucessorOfTwoTree.java
23. Given preorder traversal of a binary search tree, construct the BST - ConstructBSTFromPreOrderArray.java
24. Print two BST in sorted form - PrintTwoBSTInSortedForm.java
25. Given a binary tree and a number, return true if the tree has a root-to-leaf path such that adding up all the values along the path equals the given number - RootToLeafToSum.java
26. Range query segment tree - SegmentTree.java segmenttreesum.py
27. Segment tree for minimum range query - SegmentTreeMinimumRangeQuery.java
28. Given a binary tree with positive and negative numbers, sink negative numbers to the bottom of the tree - SinkNegativeToBottom.java
29. Given an array that stores a complete Binary Search Tree, write a function that efficiently prints the given array in ascending order - SortedOrderPrintCompleteTreeArray.java
30. Write a function that returns true if the given Binary Tree is SumTree else false. A SumTree is a Binary Tree where the value of a node is equal to sum of the nodes present in its left subtree and right subtree - SumTree.java
31. Inorder,preorder,postorder traversals - TreeTraversals.java
32. Given a binary tree, print it vertically - VerticalTreePrinting.java
33. Given a Binary Search Tree (BST), modify it so that all greater values in the given BST are added to every node - AddGreaterValueNodeToEveryNode.java
34. Print all nodes with no sibling - NodesWithNoSibling.java
35. Boundary traversal of binary tree - BoundaryTraversal.java
36. Convert a binary tree into double link list - BinaryTreeToDoubleLinkList.java
37. Given a binary tree, tell if it is a complete tree or not. IsCompleteBinaryTree.java
38. Given a preorder traversal of a tree with 0 or 2 children and char array where L stands for leaf node and N stands for inner node, create binary tree from it - ConstructTreeFromPreOrderTraversalWith0or2Child.java
39. Convert a binary tree(not BST) to a sorted link list - BinaryTreeToSortedLinkList.java
40. Given an inorder traversal of tree where each node is greater than its child nodes, create binary tree - ContructTreeFromInOrderTraversalRootGreaterThanChild.java
41. Given two nodes value find lowest common ancestor of these two nodes - LowestCommonAncestorInBinaryTree.java
42. Write a function to detect if two trees are isomorphic. Two trees are called isomorphic if one of them can be obtained from other by a series of flips - TreeIsomorphism.java
43. Vertex cover for binary tree using DP - VertexCoverBinaryTreeDP.java
44. Convert a binary tree(Not BST) to sorted linklist. DegenerateBinaryTreeToSortedLL
45. Search in binary search tree - BSTSearch.java
46. Given a binary tree, return true if is binary search tree else return false -IsBST.java
47. Given two tree return true if they represent same tree else return false. SameTree.java
48. Tree traversal in level and spiral order - TreeTraversalInSpiralOrder.java
49. Tree traversal printing each level on new line - TreeTraversalLevelByLevel.java
50. Level order traversal in reverse - LevelOrderTraversalInReverse.java
51. Fenwick tree - FenwickTree.java
52. Red black tree - RedBlackTree.java
53. Given an preorder sequence determine if it is of binary search tree or not IsPreOrderArrayBST.java
54. Succinct encoding/decoding of binary tree SuccinctTree.java
55. Create binary tree from parent representation - BinaryTreeFromParentRepresentation.java
56. Given pre/inorder traversal of binary tree, create post order traversal - PrintPostOrderFromPreOrderInOrder.java
57. Construct all binary search tree from inorder traversal ConstructAllBinaryTreeFromInorderTraversal.java
58. Interval tree IntervalTree.java
59. Morris inorder/preorder traversal of tree - MorrisTraversal.java
60. Serialize deserialize binary tree - SerializeDeserializeBinaryTree.java
61. Lowest common ancestor in binary search tree - LowestCommonAncestoryBinarySearchTree.java
62. Inorder successor of binary tree - InorderSuccessor.java
63. Maximum sum path in binary tree - BinaryTreeMaximumPathSum.java
64. Count number of nodes in complete tree - CountNodesCompleteTree.java
65. Check if binary tree is height balanced - HeightBalanced.java
66. Given an array where elements are sorted in ascending order, convert it to a height balanced BST - SortedArrayToBST.java
67. Given a binary tree, flatten it to a linked list in-place in preorder traversal - FlattenLinkListToBinaryTreePreorder.java
68. Given a binary tree and a sum, find all root-to-leaf paths where each path's sum equals the given sum - PathSum.java
69. Given a binary tree, count the number of uni-value subtrees - CountUnivalueTree.java
70. Given a non-empty binary search tree and a target value, find k values in the BST that are closest to the target - KClosestValueInBinaryTree.java.java
71. Strip leaves of the tree and collect them in list - LeavesOfBinaryTree.java