deploy: 6afff8c

Author: yanglbme

en/lc/1916/index.html

@@ -78334,7 +78334,57 @@ <h3 id="solution-1">Solution 1</h3>
 <div class="tabbed-set tabbed-alternate" data-tabs="1:4"><input checked="checked" id="__tabbed_1_1" name="__tabbed_1" type="radio" /><input id="__tabbed_1_2" name="__tabbed_1" type="radio" /><input id="__tabbed_1_3" name="__tabbed_1" type="radio" /><input id="__tabbed_1_4" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Python3</label><label for="__tabbed_1_2">Java</label><label for="__tabbed_1_3">C++</label><label for="__tabbed_1_4">Go</label></div>
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-<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span></pre></div></td><td class="code"><div><pre><span></span><code>
+<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span>
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+<span class="normal">26</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="k">class</span> <span class="nc">Solution</span><span class="p">:</span>
+    <span class="k">def</span> <span class="nf">waysToBuildRooms</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">prevRoom</span><span class="p">:</span> <span class="n">List</span><span class="p">[</span><span class="nb">int</span><span class="p">])</span> <span class="o">-&gt;</span> <span class="nb">int</span><span class="p">:</span>
+        <span class="n">modulo</span> <span class="o">=</span> <span class="mi">10</span><span class="o">**</span><span class="mi">9</span> <span class="o">+</span> <span class="mi">7</span>
+        <span class="n">ingoing</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span>
+        <span class="n">outgoing</span> <span class="o">=</span> <span class="n">defaultdict</span><span class="p">(</span><span class="nb">set</span><span class="p">)</span>
+
+        <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">range</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">prevRoom</span><span class="p">)):</span>
+            <span class="n">ingoing</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">prevRoom</span><span class="p">[</span><span class="n">i</span><span class="p">])</span>
+            <span class="n">outgoing</span><span class="p">[</span><span class="n">prevRoom</span><span class="p">[</span><span class="n">i</span><span class="p">]]</span><span class="o">.</span><span class="n">add</span><span class="p">(</span><span class="n">i</span><span class="p">)</span>
+        <span class="n">ans</span> <span class="o">=</span> <span class="p">[</span><span class="mi">1</span><span class="p">]</span>
+
+        <span class="k">def</span> <span class="nf">recurse</span><span class="p">(</span><span class="n">i</span><span class="p">):</span>
+            <span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">outgoing</span><span class="p">[</span><span class="n">i</span><span class="p">])</span> <span class="o">==</span> <span class="mi">0</span><span class="p">:</span>
+                <span class="k">return</span> <span class="mi">1</span>
+
+            <span class="n">nodes_in_tree</span> <span class="o">=</span> <span class="mi">0</span>
+            <span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">outgoing</span><span class="p">[</span><span class="n">i</span><span class="p">]:</span>
+                <span class="n">cn</span> <span class="o">=</span> <span class="n">recurse</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
+                <span class="k">if</span> <span class="n">nodes_in_tree</span> <span class="o">!=</span> <span class="mi">0</span><span class="p">:</span>
+                    <span class="n">ans</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">*=</span> <span class="n">comb</span><span class="p">(</span><span class="n">nodes_in_tree</span> <span class="o">+</span> <span class="n">cn</span><span class="p">,</span> <span class="n">cn</span><span class="p">)</span>
+                    <span class="n">ans</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">%=</span> <span class="n">modulo</span>
+                <span class="n">nodes_in_tree</span> <span class="o">+=</span> <span class="n">cn</span>
+            <span class="k">return</span> <span class="n">nodes_in_tree</span> <span class="o">+</span> <span class="mi">1</span>
+
+        <span class="n">recurse</span><span class="p">(</span><span class="mi">0</span><span class="p">)</span>
+        <span class="k">return</span> <span class="n">ans</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">%</span> <span class="n">modulo</span>
 </code></pre></div></td></tr></table></div>
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@@ -78382,6 +78432,11 @@ <h3 id="solution-1">Solution 1</h3>
 
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