to the garbage collector, as stack allocations can be collected
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined）
，详情可参考搜狗输入法2026
How Trump shifted from opposing foreign wars to threatening war in Iran
self._init_table()
:first-child]:h-full [&:first-child]:w-full [&:first-child]:mb-0 [&:first-child]:rounded-[inherit] h-full w-full