实际题目往往需要先做一步转化（如循环数组、链表转数组、先排序再栈），再套上面模板即可。
He challenged the California court's out-of-state subpoena, which he believed was compelling him to travel against his will.
。关于这个话题，旺商聊官方下载提供了深入分析
Falling volcanic ash has for years been viewed as a nuisance. But a Sicilian project has discovered its agricultural potential and wants to spread the word
Count unique parameters (after weight tying/deduplication)