3a**

int main()
{
    int d[10];
    int a,b,c,e;
    a=b=0;
    while (a<10)
    {
        cout << "vvedi kakoi-to nomer: ";
        cin >> d[b];
        a=a+1;
        b=b+1;
    }
    cout << "a teper vvedi svoyu shkolu: ";
    cin >> c;
    a=0;
    b=0;
    while (a<10)
    {
        if (c==d[b])
        {
            e=0;
        }
        a=a+1;
        b=b+1;
    }
    if (e==0)
    {
        cout << "ya znayu etu shkolu! ";
    }
    else cout << "ya ne znayu etu shkolu! ";
}