暴力贪心+预处理自动机——cf990E

using namespace std;
 
int a[maxn];
int b[maxn];
int n,m,k;
 
 
LL work(int ins)
{
    LL ans=0;
    int id=0;
    while(id<=n)
    {
        if(id+ins>=n)
        {
            ans++;
            break;
        }
        id=a[id+ins];
        ans++;
 
    }
    return ans*b[ins];
}
 
int main()
{
    while(~scanf("%d%d%d",&n,&m,&k))
    {
        lan(a,0);
        lan(b,0);
        For(i,1,m)
        {
            int tem;
            scanf("%d",&tem);
            a[tem]=1;
        }
        For(i,1,k)
        {
            int tem;
            scanf("%d",&b[i]);
        }
        if(a[0]==1)
        {
            printf("-1\n");
            continue;
        }
        int id=0;
        int curlen=0;
        int maxlen=0;
        For(i,1,n)
        {
            if(a[i]==0)
            {
                a[i]=i;
                id=i;
            }
            else
            {
                 a[i]=id;
            }
            maxlen=max(maxlen,i-a[i]);
        }
        if(maxlen>=k)
        {
            printf("-1\n");
            continue;
        }
        LL ans=1LL<<60;
       For(i,maxlen+1,k)
       {
           ans=min(ans,work(i));
       }
       printf("%lld\n",ans);
    }
    return 0;
}