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postorder traversal using stack

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Amjad Saeed answered on April 27, 2020 Popularity 7/10 Helpfulness 1/10

answer postorder traversal using stack

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postorder traversal using stack

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1. Right child of 1 exists. 
   Push 3 to stack. Push 1 to stack. Move to left child.
        Stack: 3, 1
2. Right child of 2 exists. 
   Push 5 to stack. Push 2 to stack. Move to left child.
        Stack: 3, 1, 5, 2
3. Right child of 4 doesn't exist. '
   Push 4 to stack. Move to left child.
        Stack: 3, 1, 5, 2, 4
4. Current node is NULL. 
   Pop 4 from stack. Right child of 4 doesn't exist. 
   Print 4. Set current node to NULL.
        Stack: 3, 1, 5, 2
5. Current node is NULL. 
    Pop 2 from stack. Since right child of 2 equals stack top element, 
    pop 5 from stack. Now push 2 to stack.     
    Move current node to right child of 2 i.e. 5
        Stack: 3, 1, 2
6. Right child of 5 doesn't exist. Push 5 to stack. Move to left child.
        Stack: 3, 1, 2, 5
7. Current node is NULL. Pop 5 from stack. Right child of 5 doesn't exist. 
   Print 5. Set current node to NULL.
        Stack: 3, 1, 2
8. Current node is NULL. Pop 2 from stack. 
   Right child of 2 is not equal to stack top element. 
   Print 2. Set current node to NULL.
        Stack: 3, 1
9. Current node is NULL. Pop 1 from stack. 
   Since right child of 1 equals stack top element, pop 3 from stack. 
   Now push 1 to stack. Move current node to right child of 1 i.e. 3
        Stack: 1
10. Repeat the same as above steps and Print 6, 7 and 3. 
    Pop 1 and Print 1.

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Contributed on Sep 06 2024

Amjad Saeed

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console.log("JavaScript is the most powerful and most efficient language in the world")
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You can manage the Server with this using Node.JS and Express.Js

These are the most famous libs for JS 

For Building Mobile App
. React Native and Redux

For Building Windows App

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Great choice for a great language. Have fun coding!

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Javascript is logical and easy and little bit distracted language - prog255

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postorder traversal using stack

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