#include <iostream>

using namespace std;


int main() {

    srand(time(NULL));

    int size1, size2;

    cout << "Enter size1: ";

    cin >> size1;

    cout << "Enter size2: ";

    cin >> size2;

    int* arr1 = new int[size1]; // динамическое выделение памяти

    for (int i = 0; i < size1; i++) {
        arr1[i] = rand() % 100;
        cout << arr1[i] << " ";
    }
    cout << endl;

    int* arr2 = new int[size2]; // динамическое выделение памяти

    for (int i = 0; i < size2; i++) {
        arr2[i] = rand() % 100;
        cout << arr2[i] << " ";
    }
    cout << endl;

    int size3 = size1 + size2;

    int* arr3 = new int[size3];

    for (int i = 0; i < size1; i++) {
        arr3[i] = arr1[i];
    }

    for (int i = 0; i < size2; i++) {
        arr3[i + size1] = arr2[i];
    }

    for (int i = 0; i < size3; i++) {
        cout << arr3[i] << " ";
    }
    cout << endl;

    delete[] arr1; // освобождать память оператором delete обязательно!!! под каждый new должен быть свой delete
    delete[] arr2;
    delete[] arr3;
}