问 HDU - 3247 Resource Archiver

看网上题解说做法是观察到有用的点（即在 fail 树上在某个 resource 的子树内但是不在任何 virus 的子树内的点）不会太多，但是有 hack：

$resource=\{\texttt{000},\texttt{001},\texttt{010},\texttt{011},\texttt{100},\texttt{101},\texttt{110},\texttt{111}\}$。

$virus=\{(\texttt{000})^{333},(\texttt{001})^{333},(\texttt{010})^{333},(\texttt{011})^{333},(\texttt{100})^{333},(\texttt{101})^{333},(\texttt{110})^{333},(\texttt{111})^{333}\}$。

发现有用点有 $O(\sum_{s\in virus}|s|)$ 个，爆了。

求正确做法。