Dictionary (IP), C++ (gcc)

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//g++  5.4.0

#include <iostream>
#include <string>

class Entry
{
    private:
    int key;
    std::string value;
    
    public:
    Entry(int key, std::string value){
        this->key = key;
        if (value.length() < 30){
            this->value = value;
        }
        else if (value.length() > 30){
            std::cout << "String is too large.";
        }
    }
    
    int getKey() { return key; }
    std::string getValue() { return value; }
};

class Dictionary
{
    public:
    Dictionary(){
        for (int i = 0; i < 5; i++){
            arr[i] = nullptr;
        }
    }
    ~Dictionary() {}
    
    void add(int key, std::string s)
    {
        Entry *e(key, s);
        int len = sizeof(arr) / sizeof(std::string);
        for (int i = 0; i < len; i++)
        {
            if (arr[i] != nullptr){
                arr[i] = e;
            }
        }
    }
    
    
    void remove(int key);
    Entry searchFor(int key);
    
    private:
    Entry *arr[5];
};

int main()
{
    Dictionary d;
    d.add(1, "Hello");
}

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Compilation time: 0.32 sec, absolute service time: 0,42 sec