Questions tagged [red-black-trees]
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16
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RED-BLACK TREE reduce black height of the tree
I am attemping to solve the following question about RED-BLACK Tree.
Suppose we have a RB tree T where there is at least a black node (except the root) in every path root-leaf. Every black node has ...
0
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1answer
24 views
Prove that a red-black tree with $n$ internal nodes has height at most $2\lg(n+1)$
I cannot understand the first paragraph of the proof, which comes from the known book Introduction to Algorithms, third-edition, and I consider it has some errors, could anyone help me check about it?
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19 views
Red-Black Tree Height Proof
I know that the height of a red-black tree is at most 2 lg(n + 1). However, what is the mathematical proof of this? I searched various sites, however I couldn't find a good proof. I already know the ...
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0answers
13 views
Confusion with “every path from a given node to any of the leaves goes through the same number of black nodes” property of RB trees
One of the properties of Red Black trees is: "every path from a given node/vertex to any of the leaves goes through the same number of black nodes"
Two related questions about this property:
1) is ...
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0answers
61 views
Is the internal structure of a red-black-tree dependent on the insertion order?
Is the internal structure of a red-black tree (which nodes are red or black, the disposition of the branches, the location of each value...) dependent on the order in which the elements were inserted? ...
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67 views
Red-Black tree with index
I want to create a Red-Black Tree, with 2 values, (index, value) and I want to insert into the RB_tree based on the index.
So if I have the function: $\text{insert}(root, value, index)$ it will ...
2
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1answer
47 views
What would happen if we added this rule to red-black trees?
So, I know that a normal r-b tree has a height of O(logn). What would happen is we let a red node have a red child if its parent is black?
Would the height still be O(logn)? Would you have to have a ...
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16 views
In the right-rotation case for red-black trees, there is a less efficient way to recolor it, why is it not O(log(n)) anymore?
So the first time I tried to recolor this insertion case from memory, I ended up with the right-hand side recoloring; of course the left recoloring is more efficient as the loop ends at this point. If ...
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1answer
47 views
Is the tree shown a valid red-black tree?
I have made a red-black tree and I think that it is not valid. Could someone please verify?
As far as I know, in red-black tree we also consider the leaf nodes at the NULLS of the visible leaf nodes ...
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30 views
RB trees from any balanced BST?
Given any perfectly balanced binary search tree, is it always possible to assign a coloring to the nodes so that it becomes a Red-Black tree? If so, how do you prove this, and if false, what would be ...
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0answers
114 views
Red-black tree trinode restructuring after insertion and deletion
When performing an insertion/deletion on a red-black tree, how can be argued or proved that it requires at most one/two trinode restructuring(s) respectively?
My thoughts so far were: after inserting ...
1
vote
1answer
84 views
Introduction To Algorithms 3rd Edition MIT Press: Red Black Tree insertion error in pseudo-code?
I'm implementing the algorithm on page 316 of the book Introduction to Algorithms. When I look at the pseudo-code, I feel that there is something wrong between line 10 to 14. I feel it's missing a ...
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35 views
Red Black Tree Property
Although it may sound trivial...
I was going trough the definitions for Red Black Tree in the book "Introduction to Algorithms" and I still cannot understand, why this is not a RBT?
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4
votes
1answer
971 views
Why use heap over red-black tree?
Heap supports insert operation in $O(\log n)$ time. And while heap supports remove min/max in $O(\log n)$ time, to remove any element (non min/max) heap takes $O(n)$ time.
However, red-black tree ...
0
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1answer
34 views
Augmenting a tree such that we preserve the insertion operation optimal runtime
Suppose we are given a red-black tree with $n$ vertices with distinct keys and we want to store, as addition information in each vertex $v$, the biggest key out of the keys that are smaller than $v$ (...
2
votes
1answer
163 views
Proof that a subtree of a red-black tree has no more than $\frac{3n}{4}$ nodes
I have a red-black tree with $n$ nodes, rooted at $x$. How can I prove or disprove that the number of nodes in any subtree of $x$ (including the root of the subtree) will never be greater than $\frac{...
