Describe your change:

Added a solution to Project Euler Problem 203 "Squarefree Binomial Coefficients" Link.

The solution is based on three main pilars.

1. Calculate the unique coefficients of a Pascal's Triangle of depth d .
2. Calculate the prime numbers between 2 and the maximum coefficient Cmax using a variant of the Sieve of Eratos

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doctest help

Add quickselect algorithm. Quickselect is a selection algorithm to find the kth smallest element in an unordered list.

steps to reproduce

Write a loop, from 1 to 80000, each time add a random int to the max heap.

In theory it takes very little time(NlogN, N=80000, <1sec ), but the program does take a long time.

I'v also tested the BinaryHeap in https://github.com/SolutionsDesign/Algorithmia, it performs well, so it is probably due to the bad algorithm.