String Matching Algorithms

Description: This quiz covers various string matching algorithms used to find the occurrence of a pattern within a given text.
Number of Questions: 15
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Tags: string matching algorithms pattern searching
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Which string matching algorithm is best suited for finding all occurrences of a pattern in a text?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: A
Explanation:

The Knuth-Morris-Pratt (KMP) algorithm is designed to find all occurrences of a pattern in a text efficiently by utilizing a precomputed failure function.

What is the time complexity of the brute-force string matching algorithm?

  1. O(m)

  2. O(n)

  3. O(mn)

  4. O(n^2)


Correct Option: C
Explanation:

The brute-force algorithm compares each character of the pattern with every character of the text, resulting in a time complexity of O(mn), where m is the length of the pattern and n is the length of the text.

Which string matching algorithm is known for its efficiency in finding a single occurrence of a pattern?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: B
Explanation:

The Boyer-Moore algorithm is optimized for finding a single occurrence of a pattern in a text by skipping characters in the text that are known to be mismatches.

What is the underlying principle behind the Rabin-Karp string matching algorithm?

  1. Hashing

  2. Dynamic Programming

  3. Divide and Conquer

  4. Backtracking


Correct Option: A
Explanation:

The Rabin-Karp algorithm utilizes hashing to compute a unique value for both the pattern and the text. It then compares these hashed values to determine potential matches.

Which string matching algorithm is known for its worst-case time complexity of O(n^2)?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: D
Explanation:

The brute-force algorithm has a worst-case time complexity of O(n^2), where n is the length of the text, as it compares each character of the pattern with every character of the text.

What is the key idea behind the Knuth-Morris-Pratt (KMP) algorithm?

  1. Failure Function

  2. Hashing

  3. Divide and Conquer

  4. Dynamic Programming


Correct Option: A
Explanation:

The Knuth-Morris-Pratt (KMP) algorithm utilizes a precomputed failure function to skip unnecessary character comparisons, resulting in improved efficiency.

Which string matching algorithm is commonly used in text editors and word processors?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: A
Explanation:

The Knuth-Morris-Pratt (KMP) algorithm is widely used in text editors and word processors due to its efficiency in finding all occurrences of a pattern in a text.

What is the time complexity of the Boyer-Moore string matching algorithm?

  1. O(m)

  2. O(n)

  3. O(mn)

  4. O(n^2)


Correct Option: C
Explanation:

The Boyer-Moore algorithm has a time complexity of O(mn), where m is the length of the pattern and n is the length of the text, as it performs character comparisons and skips based on mismatches.

Which string matching algorithm is known for its ability to handle large texts efficiently?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: C
Explanation:

The Rabin-Karp algorithm is designed to handle large texts efficiently by utilizing hashing to quickly compare the pattern and the text.

What is the worst-case time complexity of the Rabin-Karp string matching algorithm?

  1. O(m)

  2. O(n)

  3. O(mn)

  4. O(n^2)


Correct Option: C
Explanation:

In the worst case, the Rabin-Karp algorithm has a time complexity of O(mn), where m is the length of the pattern and n is the length of the text, as it may need to compare each character of the pattern with every character of the text.

Which string matching algorithm is commonly used in bioinformatics?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: A
Explanation:

The Knuth-Morris-Pratt (KMP) algorithm is widely used in bioinformatics for tasks such as DNA and protein sequence analysis due to its efficiency in finding all occurrences of a pattern.

What is the time complexity of the brute-force string matching algorithm for finding a single occurrence of a pattern?

  1. O(m)

  2. O(n)

  3. O(mn)

  4. O(n^2)


Correct Option: C
Explanation:

For finding a single occurrence of a pattern, the brute-force algorithm has a time complexity of O(mn), where m is the length of the pattern and n is the length of the text, as it compares each character of the pattern with every character of the text.

Which string matching algorithm is known for its simplicity and ease of implementation?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: D
Explanation:

The brute-force string matching algorithm is known for its simplicity and ease of implementation, as it involves a straightforward comparison of each character of the pattern with every character of the text.

What is the key idea behind the Boyer-Moore string matching algorithm?

  1. Failure Function

  2. Hashing

  3. Divide and Conquer

  4. Bad Character Heuristic


Correct Option: D
Explanation:

The Boyer-Moore algorithm utilizes a bad character heuristic to skip characters in the text that are known to be mismatches, resulting in improved efficiency.

Which string matching algorithm is commonly used in plagiarism detection software?

  1. Knuth-Morris-Pratt (KMP)

  2. Boyer-Moore

  3. Rabin-Karp

  4. Brute-Force


Correct Option: C
Explanation:

The Rabin-Karp algorithm is often used in plagiarism detection software due to its ability to quickly compare large texts and identify potential instances of plagiarism.

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