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<h1>HackerRank solutions <a href="https://travis-ci.org/boonious/hackerrank_elixir"><img src="https://travis-ci.org/boonious/hackerrank_elixir.svg?branch=master" alt="Build Status"/></a></h1>
<p>This repository contains some of my solutions in Elixir for various HackerRank challenges,
in particular for functional programming, algorithms and data structures. The solutions are completedly
test-driven.</p>
<h2 id="scope" class="section-heading">
<a href="#scope" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Scope
</h2>
<p>See the <a href="doc/api-reference.html">documentation</a>.</p>
<h2 id="usage" class="section-heading">
<a href="#usage" class="hover-link"><span class="icon-link" aria-hidden="true"></span></a>
Usage
</h2>
<p>The solutions are meant to be used as a reference only for your own studies and practices.
Please try your approach first, before comparing it with the one here.</p>
<p>To see what solutions are available and how they work, read the <a href="doc/api-reference.html">documentation</a> and
the corresponding test cases that include data input and output where suggested by
HackerRank. Running <a href="https://hexdocs.pm/mix/Mix.Tasks.Test.html"><code class="inline">mix test</code></a> would execute the solution against all the test cases.</p>
<p>You can also try out the solutions (functions)
using <a href="https://elixir-lang.org/getting-started/introduction.html#interactive-mode">interactive Elixir</a>
(invoking <code class="inline">iex -S mix</code> from software home directory).</p>
<pre><code class="nohighlight makeup elixir"><span class="w"> </span><span class="c1"># evaluating e^5, with 9 additional terms in the series</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">FP.Intro</span><span class="o">.</span><span class="n">exp</span><span class="p" data-group-id="9162924394-1">(</span><span class="mf">5.0</span><span class="p">,</span><span class="w"> </span><span class="mi">9</span><span class="p" data-group-id="9162924394-1">)</span><span class="w">
</span><span class="o">.</span><span class="o">.</span><span class="w">
</span><span class="c1"># trying out Sierpinski fractal triangle</span><span class="w">
</span><span class="gp unselectable">iex> </span><span class="nc">FP.Recursion.Advanced</span><span class="o">.</span><span class="n">draw_triangles</span><span class="w"> </span><span class="mi">3</span><span class="w">
</span><span class="p" data-group-id="9162924394-2">[</span><span class="s">"_______________________________1_______________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"______________________________111______________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_____________________________11111_____________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"____________________________1111111____________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"___________________________1_______1___________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"__________________________111_____111__________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_________________________11111___11111_________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"________________________1111111_1111111________________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_______________________1_______________1_______________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"______________________111_____________111______________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_____________________11111___________11111_____________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"____________________1111111_________1111111____________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"___________________1_______1_______1_______1___________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"__________________111_____111_____111_____111__________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_________________11111___11111___11111___11111_________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"________________1111111_1111111_1111111_1111111________________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_______________1_______________________________1_______________"</span><span class="p">,</span><span class="w">
</span><span class="s">"______________111_____________________________111______________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_____________11111___________________________11111_____________"</span><span class="p">,</span><span class="w">
</span><span class="s">"____________1111111_________________________1111111____________"</span><span class="p">,</span><span class="w">
</span><span class="s">"___________1_______1_______________________1_______1___________"</span><span class="p">,</span><span class="w">
</span><span class="s">"__________111_____111_____________________111_____111__________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_________11111___11111___________________11111___11111_________"</span><span class="p">,</span><span class="w">
</span><span class="s">"________1111111_1111111_________________1111111_1111111________"</span><span class="p">,</span><span class="w">
</span><span class="s">"_______1_______________1_______________1_______________1_______"</span><span class="p">,</span><span class="w">
</span><span class="s">"______111_____________111_____________111_____________111______"</span><span class="p">,</span><span class="w">
</span><span class="s">"_____11111___________11111___________11111___________11111_____"</span><span class="p">,</span><span class="w">
</span><span class="s">"____1111111_________1111111_________1111111_________1111111____"</span><span class="p">,</span><span class="w">
</span><span class="s">"___1_______1_______1_______1_______1_______1_______1_______1___"</span><span class="p">,</span><span class="w">
</span><span class="s">"__111_____111_____111_____111_____111_____111_____111_____111__"</span><span class="p">,</span><span class="w">
</span><span class="s">"_11111___11111___11111___11111___11111___11111___11111___11111_"</span><span class="p">,</span><span class="w">
</span><span class="s">"1111111_1111111_1111111_1111111_1111111_1111111_1111111_1111111"</span><span class="p" data-group-id="9162924394-2">]</span></code></pre>
<p>Note: it is necessary to provide additional functional hooks
to integrate the input and output data on HackerRank
during code submission and evaluation, typically through
<a href="https://hexdocs.pm/elixir/IO.html"><code class="inline">IO</code></a> calls in a <code class="inline">Solution.main</code> function to
parse and cast multi-line data into appropriate input data types,
as well as output results to stdout.</p>
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