Why my code got runtime error in problem 787 on UVa online judge?

My code works fine on my platform but got runtime error on UVa. Link to problem 787: https://onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&category=0&problem=728&mosmsg=Submission+received+with+ID+23495958

I've looked for errors like divide by 0 but can't find anything.

https://pastebin.com/YeC1S7Rf

//BigInt library from https://github.com/NaimHasanPappu/Algorithm/blob/master/BigInteger.cpp
int id;
Int a[105];
Int ma;
Int z=Int(0);
Int one=Int(1);
Int pd;
Int firstne;
int idfirst;
int sol()
{
    if(pd<z && idfirst<id)
    {
        pd/=firstne;
        if(pd>ma) ma=pd;
        idfirst=200;
    }
}
int main()
{
    ios_base::sync_with_stdio(false);
    int t;
    while(1)
    {
        pd=one;
        bool f=1;
        bool ne=1;
        id=-1;
        idfirst=200;
        while(cin>>t)
        {
            ++id;
            if(t==-999999) break;
            if(t==0)
            {
                f=0;
                if(z>ma) ma=z;
                if(id>1) sol();
                pd=one;
                id=-1;
                ne=1;
            }
            else
            {
                a[id]=Int(t);
                if(f) {ma=a[id]; f=0;}
                pd*=a[id];
                if(pd<z && ne)
                {
                    firstne=pd;
                    idfirst=id;
                    ne=0;
                }
                if(pd>ma) ma=pd;
            }
        }
        if(f) break;
        if(id>1) sol();
        cout<<ma<<endl;
    }
    return 0;
}