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。
Гангстер одним ударом расправился с туристом в Таиланде и попал на видео18:08
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- assignment: Array of booleans. If the formula is satisfiable provide an assignment for each variable from 1 to N. If the formula is not satisfiable this field is null.
Before diving into API design, it's worth asking: what is a stream?
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