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<div><h1 class="main-title">binary tree vertical order traversal</h1></div>
<a href="javascript:history.back()">←</a>
<a href="/">🏠</a>
<p><a href="https://leetcode.com/problems/binary-tree-vertical-order-traversal/discuss/76424/Python-solution">credit</a></p>
<div class="highlight"><pre><span></span><span class="linenos">1</span><span class="k">def</span> <span class="nf">verticalOrder</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">root</span><span class="p">):</span>
<span class="linenos">2</span> <span class="n">cols</span> <span class="o">=</span> <span class="n">collections</span><span class="o">.</span><span class="n">defaultdict</span><span class="p">(</span><span class="nb">list</span><span class="p">)</span>
<span class="linenos">3</span> <span class="n">queue</span> <span class="o">=</span> <span class="p">[(</span><span class="n">root</span><span class="p">,</span> <span class="mi">0</span><span class="p">)]</span>
<span class="linenos">4</span> <span class="k">for</span> <span class="n">node</span><span class="p">,</span> <span class="n">i</span> <span class="ow">in</span> <span class="n">queue</span><span class="p">:</span>
<span class="linenos">5</span> <span class="k">if</span> <span class="n">node</span><span class="p">:</span>
<span class="linenos">6</span> <span class="n">cols</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">val</span><span class="p">)</span>
<span class="linenos">7</span> <span class="n">queue</span> <span class="o">+=</span> <span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">left</span><span class="p">,</span> <span class="n">i</span> <span class="o">-</span> <span class="mi">1</span><span class="p">),</span> <span class="p">(</span><span class="n">node</span><span class="o">.</span><span class="n">right</span><span class="p">,</span> <span class="n">i</span> <span class="o">+</span> <span class="mi">1</span><span class="p">)</span>
<span class="linenos">8</span> <span class="k">return</span> <span class="p">[</span><span class="n">cols</span><span class="p">[</span><span class="n">i</span><span class="p">]</span> <span class="k">for</span> <span class="n">i</span> <span class="ow">in</span> <span class="nb">sorted</span><span class="p">(</span><span class="n">cols</span><span class="p">)]</span>
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