Top view of a binary tree is the set of nodes visible when the tree is viewed from the top. Given a binary tree, print the top view of it. The output nodes should be printed from left to right.
Note: A node x is there in output if x is the topmost node at its horizontal distance. Horizontal distance of the left child of a node x is equal to the horizontal distance of x minus 1, and that of right child is the horizontal distance of x plus 1.
Input: 1 / \ 2 3 / \ / \ 4 5 6 7 Output: Top view: 4 2 1 3 7 Input: 1 / \ 2 3 \ 4 \ 5 \ 6 Output: Top view: 2 1 3 6
The idea is to do something similar to Vertical Order Traversal. Like Vertical Order Traversal, we need to group nodes of same horizontal distance together. We do a level order traversal so that the topmost node at a horizontal node is visited before any other node of same horizontal distance below it. A Map is used to map the horizontal distance of the node with the node’s Data and vertical distance of the node.
Below is the implementation of the above approach:
Top View : 2 1 3 6
- Print nodes in the Top View of Binary Tree | Set 3
- Print Nodes in Top View of Binary Tree
- Sum of nodes in the right view of the given binary tree
- Sum of nodes in top view of binary tree
- Sum of nodes in bottom view of Binary Tree
- Sum of nodes in the left view of the given binary tree
- Print Right View of a Binary Tree
- Print Left View of a Binary Tree
- Print Bottom-Right View of a Binary Tree
- Iterative Method To Print Left View of a Binary Tree
- Print all nodes between two given levels in Binary Tree
- Print all even nodes of Binary Search Tree
- Print Levels of all nodes in a Binary Tree
- Print path between any two nodes in a Binary Tree
- Print all internal nodes of a Binary tree
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to email@example.com. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
Improved By : SHUBHAMSINGH10