Given a binary tree, we need to write a program to print all leaf nodes of the given binary tree from left to right. That is, the nodes should be printed in the order they appear from left to right in the given tree.
For the above binary tree, the output will be as shown below:
4 6 7 9 10
The idea to do this is similar to DFS algorithm. Below is a step by step algorithm to do this:
- Check if the given node is null. If null, then return from the function.
- Check if it is a leaf node. If the node is a leaf node, then print its data.
- If in the above step, the node is not a leaf node then check if the left and right children of node exist. If yes then call the function for left and right child of the node recursively.
Below is the implementation of the above approach.
4 6 7 9 10
Time Complexity: O( n ) , where n is the number of nodes in the binary tree.
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Improved By : sanjeev2552