What are some examples of using hash maps in C++?

What are some examples of using hash maps in C++?

Hash maps in C++ are used for efficient data retrieval. For example, you can use std::unordered_map to store key-value pairs.

Can you show me a code example?

Sure! Here's a simple example:

#include <iostream>
#include <unordered_map>

int main() {
    std::unordered_map<std::string, int> ageMap;
    ageMap["Alice"] = 30;
    ageMap["Bob"] = 25;

    std::cout << "Alice's age: " << ageMap["Alice"] << std::endl;
    return 0;
}

What are the advantages of using hash maps?

Hash maps provide average O(1) time complexity for insertions, deletions, and lookups, making them very efficient.

Are there any drawbacks to using hash maps?

Yes, hash maps can consume more memory than other data structures, and performance can degrade if many collisions occur.