Shortest Path in Python with Tests

Shortest Path holds 14 problems (9 Medium, 5 Hard). Generate any of them into the current directory with lcpy gen -n <number>.

#	Problem	Difficulty	Solution
399	Evaluate Division	Medium	solution.py
499	The Maze III	Hard	solution.py
505	The Maze II	Medium	solution.py
743	Network Delay Time	Medium	solution.py
787	Cheapest Flights Within K Stops	Medium	solution.py
882	Reachable Nodes In Subdivided Graph	Hard	solution.py
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	Medium	solution.py
1368	Minimum Cost to Make at Least One Valid Path in a Grid	Medium	solution.py
1514	Path with Maximum Probability	Medium	solution.py
1976	Number of Ways to Arrive at Destination	Medium	solution.py
2045	Second Minimum Time to Reach Destination	Hard	solution.py
2290	Minimum Obstacle Removal to Reach Corner	Hard	solution.py
2577	Minimum Time to Visit a Cell In a Grid	Hard	solution.py
2976	Minimum Cost to Convert String I	Medium	solution.py