Binary Indexed Tree in Python with Tests

Binary Indexed Tree holds 11 problems (4 Medium, 7 Hard). Generate any of them into the current directory with lcpy gen -n <number>.

#	Problem	Difficulty	Solution
218	The Skyline Problem	Hard	solution.py
307	Range Sum Query - Mutable	Medium	solution.py
308	Range Sum Query 2D - Mutable	Medium	solution.py
315	Count of Smaller Numbers After Self	Hard	solution.py
327	Count of Range Sum	Hard	solution.py
406	Queue Reconstruction by Height	Medium	solution.py
493	Reverse Pairs	Hard	solution.py
683	K Empty Slots	Hard	solution.py
1395	Count Number of Teams	Medium	solution.py
1964	Find the Longest Valid Obstacle Course at Each Position	Hard	solution.py
2940	Find Building Where Alice and Bob Can Meet	Hard	solution.py