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Which of the following best describes a hashmap?
- a)An ordered collection of key-value pairs.
- b)A data structure that allows duplicate values.
- c)A data structure that provides constant-time access to elements based on their keys.
- d)A collection of elements sorted in ascending order.
Correct answer is option 'C'. Can you explain this answer?
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Which of the following best describes a hashmap?a)An ordered collectio...
Hashmaps allow constant-time access to elements based on their keys by using a hash function to convert the key into an array index.
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Which of the following best describes a hashmap?a)An ordered collectio...
Hashmap
Hashmap is a data structure that provides constant-time access to elements based on their keys. This means that regardless of the size of the hashmap, the time taken to retrieve an element is the same, making it very efficient for lookups.
Key Characteristics of Hashmap:
- Key-Value Pairs: A hashmap is a collection of key-value pairs where each key is unique.
- Constant-Time Access: Hashmap allows for constant-time access to elements based on their keys, making it very efficient for retrieving values.
- Hashing Function: Hashmap uses a hashing function to map keys to their corresponding values, allowing for quick lookup.
- Dynamic Sizing: Hashmap can dynamically resize itself to accommodate more elements without affecting performance.
- No Duplicate Keys: Hashmap does not allow duplicate keys, ensuring each key is unique in the collection.
Benefits of Using Hashmap:
- Efficient Lookups: Hashmap provides constant-time access to elements, making it ideal for applications requiring fast retrieval of data.
- Flexibility: Hashmap can store a wide range of data types as values, providing flexibility in how data is stored and accessed.
- Scalability: Hashmap can grow in size as more elements are added, ensuring optimal performance even with large datasets.
- Easy to Use: Hashmap is easy to use and implement, making it a popular choice for developers in various programming languages.
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Which of the following best describes a hashmap?a)An ordered collection of key-value pairs.b)A data structure that allows duplicate values.c)A data structure that provides constant-time access to elements based on their keys.d)A collection of elements sorted in ascending order.Correct answer is option 'C'. Can you explain this answer?
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