отец

#include <iostream>

using namespace std;

int* sort(int* x, int n)
{
    for (int i = 0; i < n + 1; i++) {
        for (int j = 0; j < n + 1 - i; j++) {
            if (x[j] > x[j + 1]) {
                int temp = x[j];
                x[j] = x[j + 1];
                x[j + 1] = temp;
            }
        }
    }
    return x;
}

int d(int* x, int n)
{
    int dx = 0;
    for (int i = 0; i < n - 1; i++)
    {
        if (x[i + 1] - x[i] > dx)
        {
            dx = x[i + 1] - x[i];
        }
    }
    return dx;
}

void Task()
{
    int w, h, n;
    cin >> w >> h >> n;
    int* x = new int[n + 2];
    int* y = new int[n + 2];
    for (int i = 0; i < n; i++) {
        cin >> x[i] >> y[i];
    }
    x[n] = 0;
    y[n] = 0;
    x[n + 1] = w;
    y[n + 1] = h;
    x = sort(x, n);
    y = sort(y, n);
    int dx = d(x, n);
    int dy = d(y, n);
    cout << endl << (dx - 1) * (dy - 1) << endl;
}

int main()
{
    setlocale(0, "");
    Task();
    return 0;
}