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<div><h1 class="main-title">alien dictionary</h1></div>
<a href="javascript:history.back()">←</a>
<a href="/">🏠</a>
<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="k">def</span> <span class="nf">alienOrder</span><span class="p">(</span><span class="n">words</span><span class="p">):</span>
<span class="linenos"> 2</span> <span class="n">ral</span> <span class="o">=</span> <span class="p">{</span><span class="n">c</span><span class="p">:</span> <span class="p">[]</span> <span class="k">for</span> <span class="n">word</span> <span class="ow">in</span> <span class="n">words</span> <span class="k">for</span> <span class="n">c</span> <span class="ow">in</span> <span class="n">word</span><span class="p">}</span>
<span class="linenos"> 3</span> <span class="k">for</span> <span class="n">first_word</span><span class="p">,</span> <span class="n">second_word</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">words</span><span class="p">,</span> <span class="n">words</span><span class="p">[</span><span class="mi">1</span><span class="p">:]):</span>
<span class="linenos"> 4</span> <span class="k">for</span> <span class="n">c</span><span class="p">,</span> <span class="n">d</span> <span class="ow">in</span> <span class="nb">zip</span><span class="p">(</span><span class="n">first_word</span><span class="p">,</span> <span class="n">second_word</span><span class="p">):</span>
<span class="linenos"> 5</span> <span class="k">if</span> <span class="n">c</span> <span class="o">!=</span> <span class="n">d</span><span class="p">:</span>
<span class="linenos"> 6</span> <span class="n">ral</span><span class="p">[</span><span class="n">d</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">c</span><span class="p">)</span>
<span class="linenos"> 7</span> <span class="k">break</span>
<span class="linenos"> 8</span> <span class="k">else</span><span class="p">:</span>
<span class="linenos"> 9</span> <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">second_word</span><span class="p">)</span> <span class="o"><</span> <span class="nb">len</span><span class="p">(</span><span class="n">first_word</span><span class="p">):</span>
<span class="linenos">10</span> <span class="k">return</span> <span class="s2">""</span>
<span class="linenos">11</span>
<span class="linenos">12</span> <span class="n">seen</span><span class="p">,</span> <span class="n">output</span> <span class="o">=</span> <span class="p">{},</span> <span class="p">{</span><span class="s2">"str"</span><span class="p">:</span> <span class="s2">""</span><span class="p">}</span>
<span class="linenos">13</span>
<span class="linenos">14</span> <span class="k">def</span> <span class="nf">visit</span><span class="p">(</span><span class="n">node</span><span class="p">):</span>
<span class="linenos">15</span> <span class="k">if</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">seen</span><span class="p">:</span>
<span class="linenos">16</span> <span class="k">return</span> <span class="n">seen</span><span class="o">.</span><span class="n">get</span><span class="p">(</span><span class="n">node</span><span class="p">,</span> <span class="kc">False</span><span class="p">)</span>
<span class="linenos">17</span> <span class="k">for</span> <span class="n">next_node</span> <span class="ow">in</span> <span class="n">ral</span><span class="p">[</span><span class="n">node</span><span class="p">]:</span>
<span class="linenos">18</span> <span class="n">result</span> <span class="o">=</span> <span class="n">visit</span><span class="p">(</span><span class="n">next_node</span><span class="p">)</span>
<span class="linenos">19</span> <span class="k">if</span> <span class="ow">not</span> <span class="n">result</span><span class="p">:</span>
<span class="linenos">20</span> <span class="k">return</span> <span class="kc">False</span> <span class="c1"># Cycle was detected lower down.</span>
<span class="linenos">21</span> <span class="n">seen</span><span class="p">[</span><span class="n">node</span><span class="p">]</span> <span class="o">=</span> <span class="kc">True</span>
<span class="linenos">22</span> <span class="n">output</span><span class="p">[</span><span class="s2">"str"</span><span class="p">]</span> <span class="o">+=</span> <span class="n">node</span>
<span class="linenos">23</span> <span class="k">return</span> <span class="kc">True</span>
<span class="linenos">24</span>
<span class="linenos">25</span> <span class="k">return</span> <span class="n">output</span><span class="p">[</span><span class="s2">"str"</span><span class="p">]</span> <span class="k">if</span> <span class="nb">all</span><span class="p">(</span><span class="n">visit</span><span class="p">(</span><span class="n">node</span><span class="p">)</span> <span class="k">for</span> <span class="n">node</span> <span class="ow">in</span> <span class="n">ral</span><span class="p">)</span> <span class="k">else</span> <span class="s2">""</span>
<span class="linenos">26</span>
<span class="linenos">27</span><span class="nb">print</span><span class="p">(</span><span class="n">alienOrder</span><span class="p">(</span><span class="nb">list</span><span class="p">(</span><span class="nb">sorted</span><span class="p">(</span><span class="s2">"some text here"</span><span class="o">.</span><span class="n">split</span><span class="p">()))))</span>
</pre></div>
<div class="mermaid">
graph TD
h --> f
l --> h
n --> l
p --> n
b --> a
r --> n
e --> a
l --> e
r --> l
i --> a
y --> r
c --> b
r --> o
d --> c
i --> e
v --> s
o --> i
e --> d
f --> e
e --> a
i --> e
g --> f
o --> i
e --> d
h --> g
n --> d
s --> n
e --> a
l --> a
r --> l
i --> e
o --> i
i --> h
t --> n
k --> i
l --> k
o --> a
i --> e
f --> e
k --> f
l --> k
t --> l
m --> l
r --> n
e --> a
i --> e
o --> i
l --> i
y --> o
o --> m
f --> b
l --> f
n --> l
p --> o
l --> i
e --> a
s --> p
e --> a
x --> n
i --> e
n --> d
o --> i
t --> o
u --> t
g --> c
t --> s
o --> h
v --> t
w --> v
e --> a
h --> e
i --> h
t --> s
o --> i
y --> w
</div>
<p>See Also:</p>
<p><a href="/./accounts-merge-wip">accounts merge wip</a><br />
<a href="/./shifted-zip">shifted zip</a><br />
<a href="/./generating-callgraphs-in-python-with-mermaid">generating callgraphs in python with mermaid</a></p>
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