Given a binary tree, print postorder traversal of it. Postorder traversal of below tree is 5 10 39 1
First line of input contains the number of test cases T. For each test case, there will be only a single line of input which is a string representing the tree as described below:
The values in the string are in the order of level order traversal of the tree where, numbers denotes node values, and a character “N” denotes NULL child.
For the above tree, the string will be: 1 2 3 N N 4 6 N 5 N N 7 N
For each test case, in a new line, print the postorder traversal.
You don't need to take input. Just complete the function postOrder() that takes node as parameter. The newline is automatically appended by the driver code.
1 <= T <= 100
1 <= Number of nodes <= 100
1 <= Data of a node <= 1000
19 10 8 11 13
11 15 N 7
11 13 10 8 19
7 15 11
Testcase1: The tree is
So, the postorder would be 11 13 10 8 19 .
Testcase2: The tree is
So, the postorder would be 7 15 11.
Note:The Input/Ouput format and Example given are used for system's internal purpose, and should be used by a user for Expected Output only. As it is a function problem, hence a user should not read any input from stdin/console. The task is to complete the function specified, and not to write the full code.
If you have purchased any course from GeeksforGeeks then please ask your doubt on course discussion forum. You will get quick replies from GFG Moderators there.