[leetcode] 160229

[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