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核心目的:在使用队列实现栈时,应满足队列前端的元素是最后入栈的元素 queue1用于存储栈内的元素,queue 2作为入栈操作的辅助队列。 入栈时,先放入2中, 将1里面的元素都放到2里面,此时2的第一个元素即为栈顶元素,再将1和2交换即可实现栈 出栈就看1就好 ...
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