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<div><h1 class="main-title">diameter of binary tree</h1></div>
<a href="javascript:history.back()">←</a>
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<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="k">class</span> <span class="nc">Solution</span><span class="p">:</span>
<span class="linenos"> 2</span>
<span class="linenos"> 3</span> <span class="k">def</span> <span class="nf">findHeight</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"> 4</span> <span class="k">if</span> <span class="n">root</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="linenos"> 5</span> <span class="k">return</span> <span class="mi">0</span>
<span class="linenos"> 6</span>
<span class="linenos"> 7</span> <span class="n">lH</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">findHeight</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
<span class="linenos"> 8</span> <span class="n">rH</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">findHeight</span><span class="p">(</span><span class="n">root</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
<span class="linenos"> 9</span>
<span class="linenos">10</span> <span class="bp">self</span><span class="o">.</span><span class="n">maxPathLen</span> <span class="o">=</span> <span class="nb">max</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">maxPathLen</span><span class="p">,</span> <span class="n">lH</span> <span class="o">+</span> <span class="n">rH</span><span class="p">)</span>
<span class="linenos">11</span> <span class="k">return</span> <span class="nb">max</span><span class="p">(</span><span class="n">lH</span><span class="p">,</span> <span class="n">rH</span><span class="p">)</span> <span class="o">+</span> <span class="mi">1</span>
<span class="linenos">12</span>
<span class="linenos">13</span>
<span class="linenos">14</span> <span class="k">def</span> <span class="nf">findDiameter</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">15</span> <span class="bp">self</span><span class="o">.</span><span class="n">maxPathLen</span> <span class="o">=</span> <span class="mi">0</span>
<span class="linenos">16</span> <span class="bp">self</span><span class="o">.</span><span class="n">findHeight</span><span class="p">(</span><span class="n">root</span><span class="p">)</span>
<span class="linenos">17</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">maxPathLen</span>
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