Answer :
For each of the following statements about red-black trees, determine whether it is true or false. If you think it is true, provide a justification. If you think it is false, give a counterexample.
a. A subtree of a red-black tree is itself a red-black tree.
b. The sibling of an external node is either external or it is red.
c. Given a red-black tree T, there is an unique (2,4) tree T associated with T.
d. Given a (2,4) tree T, there is a unique red-black tree T associated with T.
Answer :
a. A subtree of a red-black tree is itself a red-black tree.
Answer :
False
Explanation :
A subtree of a red-black tree is itself a red-black tree.
No,Because the definition of RB trees,A subtree with a red root is not a red-black tree.Definition says that the root is always black.
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b. The sibling of an external node is either external or it is red.
Answer :
True
Explanation :
If an external node had ablack internal sibling then these 2 siblings would not have the same black depth,which would combinations of statements the property of red black trees that all leaves must have the same black depth.
c. Given a red-black tree T, there is an unique (2,4) tree T associated with T.
Answer :
True
Explanation :
All three types of nodes in a (2,4) tree can be directly converted to corresponding red-black nodes.Every node in the red-black tree with 2 red children is uniquely represented as a 4-node in T.Merge each block node with its red children to form either 2-node,4-node.So,It is true for Given a red-black tree T, there is an unique (2,4) tree T associated with T.
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d. Given a (2,4) tree T, there is a unique red-black tree T associated with T.
Answer :
False.
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For each of the following statements about red-black trees, determine whether it is true or false....
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Java Red-Black Tree Assignment
Part 3: Red-black trees
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