用堆棧(stack) 實現隊列(queue)

原題在這裏: https://www.hackerrank.com/challenges/ctci-queue-using-two-stacks/problem?h_l=interview&playlist_slugs%5B%5D=interview-preparation-kit&playlist_slugs%5B%5D=stacks-queues   A queue is an abstrac
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