void minmax(int v[], int s, int d, int &minn, int &maxx)
{
    if(s==d) minn=maxx=v[s];
    else
    {
        int a,b,x,y;
        minmax(v,s,(s+d)/2,a,x);
        minmax(v,(s+d)/2+1,d,b,y);
        if(a<b) minn=a;
        else minn=b;
        if(x>y) maxx=x;
        else maxx=y;
    }
}