question1.cpp

#include <iostream>
using namespace std;

void main()
{
    int a = 1, b = 2;
    int arr[] = {1, 3, 5, a, b};
    int *p = arr + 1;
    int **q = &p;
    int ***crazy = new int**[*(arr + 4)];

    crazy[0] = q;
    crazy[1] = new int*[*(p - 1)];

    crazy[1][0] = &arr[2];

    cout << arr[crazy[0][0][1] - a] + arr[crazy[1][0][1]] + b << endl;

    delete [] crazy[1];

    delete [] crazy;
}

question2.cpp

#include <iostream>
using namespace std;

struct A
{
    int a;
};

struct B
{
    int b;
    A*  a;
    int aSize;
};

struct C
{
    int c;
    B** b;
    int bSize;
};

void main()
{
    A a1 = {0};
    A a2 = {2};
    A a3 = {4};

    B b1;
    b1.b = a2.a * a3.a;
    b1.aSize = 3;

    b1.a = new A[b1.aSize];
    b1.a[0] = a1;
    b1.a[1] = a2;
    b1.a[2] = a3;


    B b2;
    b2.aSize = 20;
    b2.a = new A[b2.aSize];

    C c;
    c.c = 0;
    for (int i = 0; i < b1.aSize; i++)
    {
        c.c += b1.a[i].a;
    }

    c.bSize = c.c / 2;
    c.b = new B*[c.bSize];
    c.b[0] = &b1;
    c.b[1] = &b2;

    for (int i = 0; i < c.bSize; i++)
    {
        for (int j = 0; j < c.b[i]->aSize; j++)
        {
            cout << c.b[i]->a[j].a << endl;
        }
    }
}

question3.cpp

#include <iostream>
using namespace std;

void main()
{
    int arr[] = {1, 3, 7, 9, 2, 4, -1, -3};
    int size = sizeof(arr) / sizeof(arr[0]);
    int i = 0;
    while(i < size)
    {
         if (i + 1 != size) 
         {
             cout << arr[i] + arr[i + 1];
         }
    }
}