The Gateway to Computer Science Excellence
First time here? Checkout the FAQ!
0 votes
asked in Algorithms by (11 points) | 439 views

1 Answer

0 votes

If you know what inorder is then predecessor / successor is too easy 
e.g  inorder of a BST  is increasing sorted order 
3   5   8   12   15   21   25   27   31   35
if u want to find inorder successor of 15  
u can see it is 21  
Now how to find it in BST   inorder successor of 15
pick up right subtree of 15 and find minimum element there which is 21 
And to minimum element in BST you have to travel to leftmost branch upto leave i.e go left left left upto leave
Overall Conclusion :  1. Pick right subtree
                                2. then go left left left ..... find minimum element in that subtree which is leftmost element

If you understand this predecessor is just reverse of it 
lemme know if you still have problem

answered by Active (2.8k points)
But the question which I asked is pre-order and post-order's predecessor and successor

Quick search syntax
tags tag:apple
author user:martin
title title:apple
content content:apple
exclude -tag:apple
force match +apple
views views:100
score score:10
answers answers:2
is accepted isaccepted:true
is closed isclosed:true

37,162 questions
44,732 answers
43,805 users