C++ ACM题 无法AC请解答我错在哪里

#include

using namespace std;

int main()
{
    int t,time;
    while(~scanf("%d",&t))
    {
        for(time=0; time        {
            int i,n,goal;
            scanf("%d",&n);
            float a[13],b[13],c[13],p[13];
            for(i=0; i            {
                scanf("%f",&a[i]);
            }
            for(i=0; i            {
                scanf("%f",&b[i]);
            }
            for(i=0; i            {
                scanf("%f",&c[i]);
                p[i]=1-(1-a[i])*(1-b[i])*(1-c[i]);
            }
            scanf("%d",&goal );
            float pos=0;
            for(int exm=0; exm<(1<            {
                float cor=1*1.0;
                int r,num=0;
                for(r=0; r<=n; r++)
                {
                    if(exm&(1<                    {
                        if(num<=goal)
                        {
                            cor*=p[r];
                            num+=1;
                        }
                        else
                            break;
                    }
                    else
                    {
                        cor*=(1-p[r]);
                    }
                }
                if(num==goal)
                    pos+=cor;
            }
            printf("%.4f\n",pos);
        }
    }
    return 0;
}