Memoization in Python with Tests

Memoization holds 20 problems (3 Easy, 8 Medium, 9 Hard). Generate any of them into the current directory with lcpy gen -n <number>.

#	Problem	Difficulty	Solution
70	Climbing Stairs	Easy	solution.py
139	Word Break	Medium	solution.py
140	Word Break II	Hard	solution.py
241	Different Ways to Add Parentheses	Medium	solution.py
294	Flip Game II	Medium	solution.py
329	Longest Increasing Path in a Matrix	Hard	solution.py
397	Integer Replacement	Medium	solution.py
464	Can I Win	Medium	solution.py
488	Zuma Game	Hard	solution.py
509	Fibonacci Number	Easy	solution.py
546	Remove Boxes	Hard	solution.py
638	Shopping Offers	Medium	solution.py
698	Partition to K Equal Sum Subsets	Medium	solution.py
894	All Possible Full Binary Trees	Medium	solution.py
913	Cat and Mouse	Hard	solution.py
964	Least Operators to Express Number	Hard	solution.py
1137	N-th Tribonacci Number	Easy	solution.py
1553	Minimum Number of Days to Eat N Oranges	Hard	solution.py
1611	Minimum One Bit Operations to Make Integers Zero	Hard	solution.py
1857	Largest Color Value in a Directed Graph	Hard	solution.py