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<div><h1 class="main-title">decoding a string</h1></div>
<a href="javascript:history.back()">←</a>
<a href="/">🏠</a>
<p>Can't remember the exact name of this problem, but essentially involves counting the number of different ways a string of numbers representing letters of the alphabet can be interpreted.</p>
<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="n">S</span> <span class="o">=</span> <span class="s2">"26157"</span>
<span class="linenos"> 2</span><span class="n">data</span> <span class="o">=</span> <span class="p">{</span><span class="s1">'ways'</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">}</span>
<span class="linenos"> 3</span>
<span class="linenos"> 4</span><span class="k">def</span> <span class="nf">count_number_of_ways</span><span class="p">(</span><span class="n">s</span><span class="p">):</span>
<span class="linenos"> 5</span> <span class="n">data</span><span class="p">[</span><span class="s1">'ways'</span><span class="p">]</span> <span class="o">+=</span> <span class="mi">1</span>
<span class="linenos"> 6</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">>=</span> <span class="mi">2</span><span class="p">:</span>
<span class="linenos"> 7</span> <span class="n">count_number_of_ways</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">1</span><span class="p">:])</span>
<span class="linenos"> 8</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">s</span><span class="p">)</span> <span class="o">>=</span> <span class="mi">2</span> <span class="ow">and</span> <span class="nb">int</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">0</span><span class="p">:</span><span class="mi">2</span><span class="p">])</span> <span class="o"><=</span> <span class="mi">26</span><span class="p">:</span>
<span class="linenos"> 9</span> <span class="n">count_number_of_ways</span><span class="p">(</span><span class="n">s</span><span class="p">[</span><span class="mi">2</span><span class="p">:])</span>
<span class="linenos">10</span> <span class="k">return</span> <span class="n">data</span><span class="p">[</span><span class="s1">'ways'</span><span class="p">]</span>
<span class="linenos">11</span>
<span class="linenos">12</span><span class="n">ways</span> <span class="o">=</span> <span class="n">count_number_of_ways</span><span class="p">(</span><span class="n">S</span><span class="p">)</span>
<span class="linenos">13</span><span class="nb">print</span><span class="p">(</span><span class="n">ways</span><span class="p">)</span>
</pre></div>
<p>Output:</p>
<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="mi">2</span> <span class="o">--></span> <span class="mi">6157</span>
<span class="linenos"> 2</span><span class="mi">6</span> <span class="o">--></span> <span class="mi">157</span>
<span class="linenos"> 3</span><span class="mi">1</span> <span class="o">--></span> <span class="mi">57</span>
<span class="linenos"> 4</span><span class="mi">5</span> <span class="o">--></span> <span class="mi">7</span>
<span class="linenos"> 5</span><span class="mi">15</span> <span class="o">--></span> <span class="mi">7</span>
<span class="linenos"> 6</span><span class="mi">26</span> <span class="o">--></span> <span class="mi">157</span>
<span class="linenos"> 7</span><span class="mi">1</span> <span class="o">--></span> <span class="mi">57</span>
<span class="linenos"> 8</span><span class="mi">5</span> <span class="o">--></span> <span class="mi">7</span>
<span class="linenos"> 9</span><span class="mi">15</span> <span class="o">--></span> <span class="mi">7</span>
<span class="linenos">10</span><span class="mi">9</span>
</pre></div>
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