How do I implement a hash map in C++?

How do I implement a hash map in C++?

To implement a hash map in C++, you can use an array of linked lists or a dynamic array. Would you like a code example?

Yes, please provide a simple code example.

Here's a basic implementation:

#include <iostream>
#include <list>
#include <vector>

class HashMap {
private:
    static const int hashSize = 10;
    std::vector<std::list<std::pair<int, std::string>>> table;

public:
    HashMap() {
        table.resize(hashSize);
    }

    void insert(int key, std::string value) {
        int index = key % hashSize;
        table[index].emplace_back(key, value);
    }

    std::string get(int key) {
        int index = key % hashSize;
        for (auto& pair : table[index]) {
            if (pair.first == key) {
                return pair.second;
            }
        }
        return "Not found";
    }
};

Would you like to know more about how it works?

Yes, can you explain how the hashing works in this example?

In this example, the hashing is done using the modulo operator. The key is divided by the size of the hash table, and the remainder is used as the index to store the value. This helps in distributing the keys uniformly across the table.