[Implement Stack using Queues]
https://leetcode.com/problems/implement-stack-using-queues/
[Implement Queue using Stacks]
https://leetcode.com/problems/implement-queue-using-stacks/
stack, queue를 2개씩 만들어서, 하나의 stack or queue에 pop()할 item을 하나씩 유지
[Simplify Path]
https://leetcode.com/problems/simplify-path/
stack
Python "///".split("/") = ['','','',''] 과 같이 리턴
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