尝试理解c++中的哈希表代码

#include <iostream>
#include <list>

class HashTable {
private:
    static const int TABLE_SIZE = 10;
    std::list<std::pair<int, std::string>> table[TABLE_SIZE];

public:
    void insert(int key, const std::string& value) {
        int index = hashFunction(key);
        table[index].push_back(std::make_pair(key, value));
    }

    std::string search(int key) {
        int index = hashFunction(key);
        for (const auto& pair : table[index]) {
            if (pair.first == key) {
                return pair.second;
            }
        }
        return "Key not found";
    }

    void remove(int key) {
        int index = hashFunction(key);
        for (auto it = table[index].begin(); it != table[index].end(); ++it) {
            if (it->first == key) {
                table[index].erase(it);
                break;
            }
        }
    }

private:
    int hashFunction(int key) {
        return key % TABLE_SIZE;
    }
};

int main() {
    HashTable hashTable;
    hashTable.insert(1, "Value 1");
    hashTable.insert(2, "Value 2");
    hashTable.insert(11, "Value 11");

    std::cout << hashTable.search(2) << std::endl;  // Output: Value 2
    std::cout << hashTable.search(11) << std::endl; // Output: Value 11
    std::cout << hashTable.search(3) << std::endl;  // Output: Key not found

    hashTable.remove(2);
    std::cout << hashTable.search(2) << std::endl;  // Output: Key not found

    return 0;
}