Queue in Python with Tests

Queue holds 28 problems (7 Easy, 14 Medium, 7 Hard). Generate any of them into the current directory with lcpy gen -n <number>.

#	Problem	Difficulty	Solution
225	Implement Stack using Queues	Easy	solution.py
232	Implement Queue using Stacks	Easy	solution.py
239	Sliding Window Maximum	Hard	solution.py
281	Zigzag Iterator	Medium	solution.py
341	Flatten Nested List Iterator	Medium	solution.py
346	Moving Average from Data Stream	Easy	solution.py
353	Design Snake Game	Medium	solution.py
362	Design Hit Counter	Medium	solution.py
379	Design Phone Directory	Medium	solution.py
387	First Unique Character in a String	Easy	solution.py
622	Design Circular Queue	Medium	solution.py
641	Design Circular Deque	Medium	solution.py
649	Dota2 Senate	Medium	solution.py
683	K Empty Slots	Hard	solution.py
862	Shortest Subarray with Sum at Least K	Hard	solution.py
918	Maximum Sum Circular Subarray	Medium	solution.py
933	Number of Recent Calls	Easy	solution.py
936	Stamping The Sequence	Hard	solution.py
950	Reveal Cards In Increasing Order	Medium	solution.py
995	Minimum Number of K Consecutive Bit Flips	Hard	solution.py
1425	Constrained Subsequence Sum	Hard	solution.py
1429	First Unique Number	Medium	solution.py
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	Medium	solution.py
1700	Number of Students Unable to Eat Lunch	Easy	solution.py
1823	Find the Winner of the Circular Game	Medium	solution.py
2073	Time Needed to Buy Tickets	Easy	solution.py
2534	Time Taken to Cross the Door	Hard	solution.py
3191	Minimum Operations to Make Binary Array Elements Equal to One I	Medium	solution.py