what are mistakes in this code?
#include <iostream>
using namespace std;
long long int a[15000];
long long int b[1000000];
int main()
{
    int c, f, d, e, g,l;
    l = 0;
    cin >> c;
    for (f = 0; f != c; f++)
    {
        cin >> a[f];
    }
    cin >> d;
    for (e = 0; e != d; e++)
    {
        cin >> b[e];
    }
    for (e = 0; e != d; e++)
    {
        g = b[e];
        for (f = 0; f != c; f++)
        {
            if (g == a[f])
            {
                l = l++;
                break;
            }

        }
    }
    cout << l << endl;
    system("pause");
    return 0;
}

Edited by author 18.02.2022 18:53