c++ function to extract all the Subsequences in the array of numbers ranged between 1 to 4

main.cpp

#include <iostream>


int subsequence(int arr[], int length)
{
    // counter the number of Subsequences
    int counter = 0;

    for (size_t i = 0; i < length; i++)
    {
        for (size_t j = i; j < length; j++)
        {
            if (i == j)
            { // print the first range ( it's most likly only on item)
                std::cout << '[' << arr[i] << ']' << std::endl;
                counter++;
                continue;
            }

            if(j - i >= 2) {
                std::cout << '[' << arr[i] << ", " << arr[j] << ']' << std::endl;
                counter++;
            }

            // print all the number between range i and j
            std::cout << '[';
            for (size_t k = i; k < j; k++)
            {
                std::cout << arr[k] << ", ";
            }
            
            std::cout << arr[j];
            std::cout << ']' << std::endl;
            counter++;

            if (j - i == 3)
            {
                for (size_t k = i + 1; k < j; k++)
                {

                    if (j - k > 2)
                    {
                        std::cout << '[' << arr[i] << ", ";
                        std::cout << arr[k] << ", ";
                        std::cout << arr[j] << ']';
                        counter++;
                    }

                    std::cout << '[' << arr[i] << ", ";

                    for (size_t l = k; l < j; l++)
                    {
                        std::cout << arr[k] << ", ";
                    }
                    std::cout << arr[j];
                    std::cout << ']';
                    counter++;
                }
            }
        }
        std::cout << std::endl;
    }
    return counter;
}

int main()
{
    int arr[] = {1, 2, 3,4, 5};
    int length = sizeof(arr) / sizeof(*arr);

    int val = subsequence(arr, length);
    std::cout << std::endl;
    std::cout << val;
    return 0;
};