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Which of the following statements about hash tables is false?
- a)Hash tables provide constant-time average-case lookup.
- b)Hash tables have a fixed size once created.
- c)Hash collisions can occur in hash tables.
- d)Hash tables can store duplicate keys.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following statements about hash tables is false?a)Hash ta...
Hash tables can dynamically resize to accommodate more elements as needed.
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Which of the following statements about hash tables is false?a)Hash ta...
Understanding Hash Tables
Hash tables are a fundamental data structure used to store key-value pairs, allowing for efficient data retrieval. Let’s examine the statements and clarify why option 'B' is false.
Constant-Time Average-Case Lookup
- Hash tables provide constant-time average-case lookup, meaning that accessing a value based on its key is typically done in O(1) time, making them very efficient.
Fixed Size Once Created
- This statement is false.
- While some implementations of hash tables have a predetermined size, many modern hash tables are dynamic.
- They can resize (expand or shrink) themselves when a certain load factor threshold is reached, allowing for efficient memory use and maintaining performance.
Hash Collisions
- Hash collisions can occur when different keys produce the same hash value.
- This is a common scenario in hash tables, and various techniques (like chaining or open addressing) are used to handle them effectively.
Storing Duplicate Keys
- Hash tables typically do not allow duplicate keys.
- If a new key-value pair is inserted with a key that already exists, it usually updates the existing value rather than creating a duplicate.
Conclusion
In summary, statement 'B' is false because hash tables can be dynamic in size, allowing for growth and adaptability based on usage, contrary to the notion of having a fixed size. Understanding these characteristics is essential for effectively utilizing hash tables in software development.
Hash tables are a fundamental data structure used to store key-value pairs, allowing for efficient data retrieval. Let’s examine the statements and clarify why option 'B' is false.
Constant-Time Average-Case Lookup
- Hash tables provide constant-time average-case lookup, meaning that accessing a value based on its key is typically done in O(1) time, making them very efficient.
Fixed Size Once Created
- This statement is false.
- While some implementations of hash tables have a predetermined size, many modern hash tables are dynamic.
- They can resize (expand or shrink) themselves when a certain load factor threshold is reached, allowing for efficient memory use and maintaining performance.
Hash Collisions
- Hash collisions can occur when different keys produce the same hash value.
- This is a common scenario in hash tables, and various techniques (like chaining or open addressing) are used to handle them effectively.
Storing Duplicate Keys
- Hash tables typically do not allow duplicate keys.
- If a new key-value pair is inserted with a key that already exists, it usually updates the existing value rather than creating a duplicate.
Conclusion
In summary, statement 'B' is false because hash tables can be dynamic in size, allowing for growth and adaptability based on usage, contrary to the notion of having a fixed size. Understanding these characteristics is essential for effectively utilizing hash tables in software development.
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Which of the following statements about hash tables is false?a)Hash tables provide constant-time average-case lookup.b)Hash tables have a fixed size once created.c)Hash collisions can occur in hash tables.d)Hash tables can store duplicate keys.Correct answer is option 'B'. Can you explain this answer?
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