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<div class="section" id="advent-of-code-2017">
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<h1>Advent of Code 2017<a class="headerlink" href="#advent-of-code-2017" title="Permalink to this headline">¶</a></h1>
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<div class="section" id="december-4th">
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<h2>December 4th<a class="headerlink" href="#december-4th" title="Permalink to this headline">¶</a></h2>
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<p>To ensure security, a valid passphrase must contain no duplicate words.</p>
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<p>For example:</p>
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<ul class="simple">
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<li>aa bb cc dd ee is valid.</li>
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<li>aa bb cc dd aa is not valid - the word aa appears more than once.</li>
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<li>aa bb cc dd aaa is valid - aa and aaa count as different words.</li>
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</ul>
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<p>The system’s full passphrase list is available as your puzzle input. How
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many passphrases are valid?</p>
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<div class="code ipython2 highlight-default notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">notebook_preamble</span> <span class="k">import</span> <span class="n">J</span><span class="p">,</span> <span class="n">V</span><span class="p">,</span> <span class="n">define</span>
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</pre></div>
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</div>
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<p>I’ll assume the input is a Joy sequence of sequences of integers.</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[[</span><span class="mi">5</span> <span class="mi">1</span> <span class="mi">9</span> <span class="mi">5</span><span class="p">]</span>
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<span class="p">[</span><span class="mi">7</span> <span class="mi">5</span> <span class="mi">4</span> <span class="mi">3</span><span class="p">]</span>
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<span class="p">[</span><span class="mi">2</span> <span class="mi">4</span> <span class="mi">6</span> <span class="mi">8</span><span class="p">]]</span>
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</pre></div>
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</div>
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<p>So, obviously, the initial form will be a <code class="docutils literal notranslate"><span class="pre">step</span></code> function:</p>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">AoC2017</span><span class="o">.</span><span class="mi">4</span> <span class="o">==</span> <span class="mi">0</span> <span class="n">swap</span> <span class="p">[</span><span class="n">F</span> <span class="o">+</span><span class="p">]</span> <span class="n">step</span>
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</pre></div>
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</div>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">F</span> <span class="o">==</span> <span class="p">[</span><span class="n">size</span><span class="p">]</span> <span class="p">[</span><span class="n">unique</span> <span class="n">size</span><span class="p">]</span> <span class="n">cleave</span> <span class="o">=</span>
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</pre></div>
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</div>
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<p>The <code class="docutils literal notranslate"><span class="pre">step_zero</span></code> combinator includes the <code class="docutils literal notranslate"><span class="pre">0</span> <span class="pre">swap</span></code> that would normally
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open one of these definitions:</p>
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<div class="code ipython2 highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">J</span><span class="p">(</span><span class="s1">'[step_zero] help'</span><span class="p">)</span>
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</pre></div>
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</div>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="mi">0</span> <span class="n">roll</span><span class="o">></span> <span class="n">step</span>
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</pre></div>
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</div>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">AoC2017</span><span class="o">.</span><span class="mi">4</span> <span class="o">==</span> <span class="p">[</span><span class="n">F</span> <span class="o">+</span><span class="p">]</span> <span class="n">step_zero</span>
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</pre></div>
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</div>
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<div class="code ipython2 highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">define</span><span class="p">(</span><span class="s1">'AoC2017.4 == [[size] [unique size] cleave = +] step_zero'</span><span class="p">)</span>
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</pre></div>
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</div>
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<div class="code ipython2 highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">J</span><span class="p">(</span><span class="s1">'''</span>
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<span class="s1">[[5 1 9 5]</span>
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<span class="s1"> [7 5 4 3]</span>
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<span class="s1"> [2 4 6 8]] AoC2017.4</span>
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<span class="s1">'''</span><span class="p">)</span>
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</pre></div>
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</div>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="mi">2</span>
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</pre></div>
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<h3><a href="../index.html">Table Of Contents</a></h3>
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<ul>
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<li><a class="reference internal" href="#">Advent of Code 2017</a><ul>
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<li><a class="reference internal" href="#december-4th">December 4th</a></li>
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<span xmlns:dct="http://purl.org/dc/terms/" property="dct:title">Thun Documentation</span> by <a xmlns:cc="http://creativecommons.org/ns#" href="https://joypy.osdn.io/" property="cc:attributionName" rel="cc:attributionURL">Simon Forman</a> is licensed under a <a rel="license" href="http://creativecommons.org/licenses/by-nc-sa/4.0/">Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License</a>.<br />Based on a work at <a xmlns:dct="http://purl.org/dc/terms/" href="https://osdn.net/projects/joypy/" rel="dct:source">https://osdn.net/projects/joypy/</a>.
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