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Nikita has a stack. A stack in this problem is a data structure that supports two operations. Operation push(x) puts an integer x on the top of the st 阅读全文
posted @ 2017-02-12 22:40
perplex
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A new innovative ticketing systems for public transport is introduced in Bytesburg. Now there is a single travel card for all transport. To make a tri 阅读全文
posted @ 2017-02-12 22:35
perplex
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