What is the performance of C++11 standard hash tables?
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What is the performance of C++11 standard hash tables?
C++11 introduced unordered_map, which offers average O(1) time complexity for insertions, deletions, and lookups.
How does it compare to other data structures like std::map?
Unlike std::map, which is implemented as a balanced tree with O(log n) complexity, unordered_map is generally faster for most operations.
Are there any downsides to using unordered_map?
Yes, unordered_map can have higher memory usage due to its underlying hash table and may suffer from performance degradation if many collisions occur.
What factors affect the performance of hash tables?
Key factors include the quality of the hash function, load factor, and the method used for collision resolution.
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