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Trie Questions

Home > Technical Aptitude > Data Structures > Trie > General Questions
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Choose the correct option.

Which tree allows fast implementation of a set of string operation?


ARope Tree

BTango Tree

CGeneralized Suffix Tree

DTop Tree

Answer: Option C

Explanation:

In computer science, the generalized suffix is a special suffix tree which contains a set of strings or set of words instead of a single string like suffix tree. Hence Different operation can be performed on a set of strings using a generalized suffix tree.

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What is a time complexity for finding the longest palindromic substring in a string by using the generalized suffix tree?


ALinear Time

BExponential Time

CLogarithmic Time

DCubic Time

Answer: Option A

Explanation:

Palindrome is a string that is same when reading forward as well as backward. The time complexity for finding the longest palindromic substring in a string by using generalized suffix tree is linear time.

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What is a time complexity for inserting an alphabet in the tree using hash maps?


AO (log n!)

BO (n!)

CO (n2)

DO (1)

Answer: Option D

Explanation:

Suffix tree is also known as PAT tree or position tree. It allows fast string operation. Total time taken for construction of suffix tree is linear to the length of the tree. The time complexity for inserting an alphabet in the tree using hash maps is constant, O (1).

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What is the other name for Suffix Tree?


AArray

BStack

CPriority Queue

DPAT Tree

Answer: Option D

Explanation:

In computer science, a suffix tree is also known as PAT tree or position tree. It is a compressed search tree or prefix tree in which keys contain the suffix of text values as the text position.

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Which tree provides a linear time solution for substring operation?


ARope Tree

BSuffix Tree

CTango Tree

DTop Tree

Answer: Option B

Explanation:

It is a compressed search tree or prefix tree in which keys contain the suffix of text values as the text position. It allows fast string operation to be carried out by the user. The substring operation can be performed by suffix tree in linear time.

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Who among the following provided the first suffix tree contribution for all alphabet?


AWeiner

BFarach

CUkkonen

DAlexander Morse

Answer: Option B

Explanation:

The concept of Suffix Tree was introduced by Weiner in 1973. Ukkonen provided the first online contribution of Suffix tree which had the time complexity of the fastest algorithm of that period. Farach gave the first suffix tree contribution for all alphabets in 1997.

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Who among the following algorithm is used in external memory and compression of the suffix tree?


AWeiner’s algorithm

BFarach’s algorithm

CUkkonen’s algorithm

DAlexander Morse

Answer: Option B

Explanation:

The concept of Suffix Tree was introduced by Weiner in 1973. Ukkonen provided the first online contribution of the Suffix tree. Farach gave the first suffix tree contribution for all alphabets in 1997. Farach’s algorithm is used in external memory and compression.

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Which statement is correct of suffix tree with a string of length n?


AThe tree has n leaves.

BThe tree has n roots

CHeight of Tree is n

DDepth of tree is n

Answer: Option A

Explanation:

In computer science, a suffix tree is also known as PAT tree or position tree. It is a compressed search tree or prefix tree in which keys contain the suffix of text values as the text position. For a string of length n, the suffix tree has leaves equal to n.

Workspace

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Do all the nodes have at least two children in suffix tree.


ATRUE

BFALSE

Answer: Option B

Explanation:

It is a compressed search tree or prefix tree in which keys contain the suffix of text values as the text position. All the nodes (internal) except for the root nodes have at least two children.

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What is a time complexity for checking a string of length n is substring or not?


AO (log n!)

BO (n!)

CO (n2)

DO (n)

Answer: Option D

Explanation:

Suffix tree is also known as PAT tree or position tree. It allows fast string operation. Total time taken for construction of suffix tree is linear to the length of the tree. To check if a substring is present in a string of a length of n, the time complexity for such operation is found to be O (n).

Workspace

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