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<div><h1 class="main-title">binary search tree iterator</h1></div>
<a href="javascript:history.back()">←</a>
<a href="/">🏠</a>
<h2 id="tushar-solution">Tushar Solution</h2>
<p>Credit: Tushar</p>
<p>https://leetcode.com/problems/binary-search-tree-iterator/</p>
<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="k">class</span> <span class="nc">TreeNode</span><span class="p">:</span>
<span class="linenos"> 2</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">left</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">right</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="linenos"> 3</span> <span class="bp">self</span><span class="o">.</span><span class="n">val</span> <span class="o">=</span> <span class="n">x</span>
<span class="linenos"> 4</span> <span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="o">=</span> <span class="n">left</span>
<span class="linenos"> 5</span> <span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="o">=</span> <span class="n">right</span>
<span class="linenos"> 6</span>
<span class="linenos"> 7</span><span class="k">class</span> <span class="nc">BSTIterator</span><span class="p">:</span>
<span class="linenos"> 8</span> <span class="k">def</span> <span class="fm">__init__</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="n">TreeNode</span><span class="p">):</span>
<span class="linenos"> 9</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">root</span>
<span class="linenos">10</span> <span class="bp">self</span><span class="o">.</span><span class="n">gen</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
<span class="linenos">11</span>
<span class="linenos">12</span> <span class="k">def</span> <span class="nf">dfs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">n</span><span class="p">):</span>
<span class="linenos">13</span> <span class="k">if</span> <span class="n">n</span><span class="p">:</span>
<span class="linenos">14</span> <span class="k">if</span> <span class="n">n</span><span class="o">.</span><span class="n">left</span><span class="p">:</span>
<span class="linenos">15</span> <span class="k">yield from</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="n">n</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
<span class="linenos">16</span> <span class="k">yield</span> <span class="n">n</span><span class="o">.</span><span class="n">val</span>
<span class="linenos">17</span> <span class="k">if</span> <span class="n">n</span><span class="o">.</span><span class="n">right</span><span class="p">:</span>
<span class="linenos">18</span> <span class="k">yield from</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="n">n</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
<span class="linenos">19</span>
<span class="linenos">20</span> <span class="k">def</span> <span class="fm">__iter__</span><span class="p">(</span><span class="bp">self</span><span class="p">):</span>
<span class="linenos">21</span> <span class="k">return</span> <span class="bp">self</span>
<span class="linenos">22</span>
<span class="linenos">23</span> <span class="k">def</span> <span class="fm">__next__</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="nb">int</span><span class="p">:</span>
<span class="linenos">24</span> <span class="k">return</span> <span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">gen</span><span class="p">)</span>
<span class="linenos">25</span>
<span class="linenos">26</span>
<span class="linenos">27</span>
<span class="linenos">28</span><span class="n">obj</span> <span class="o">=</span> <span class="n">BSTIterator</span><span class="p">(</span><span class="n">TreeNode</span><span class="p">(</span><span class="mi">7</span><span class="p">,</span> <span class="n">TreeNode</span><span class="p">(</span><span class="mi">3</span><span class="p">),</span> <span class="n">TreeNode</span><span class="p">(</span><span class="mi">15</span><span class="p">,</span> <span class="n">TreeNode</span><span class="p">(</span><span class="mi">9</span><span class="p">),</span> <span class="n">TreeNode</span><span class="p">(</span><span class="mi">20</span><span class="p">))))</span>
<span class="linenos">29</span>
<span class="linenos">30</span><span class="k">for</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">obj</span><span class="p">:</span>
<span class="linenos">31</span> <span class="nb">print</span><span class="p">(</span><span class="n">v</span><span class="p">)</span>
</pre></div>
<p>Output:</p>
<div class="highlight"><pre><span></span><span class="linenos">1</span><span class="n">sherlock</span> <span class="n">ran</span> <span class="mi">33</span> <span class="n">lines</span> <span class="n">of</span> <span class="n">Python</span> <span class="mi">3</span><span class="p">:</span>
<span class="linenos">2</span>
<span class="linenos">3</span><span class="mi">3</span>
<span class="linenos">4</span><span class="mi">7</span>
<span class="linenos">5</span><span class="mi">9</span>
<span class="linenos">6</span><span class="mi">15</span>
<span class="linenos">7</span><span class="mi">20</span>
<span class="linenos">8</span>
<span class="linenos">9</span><span class="o">>>></span> <span class="p">(</span><span class="n">finished</span> <span class="ow">in</span> <span class="mf">1.21</span><span class="n">s</span><span class="p">):</span>
</pre></div>
<h2 id="shyal-solution">Shyal Solution</h2>
<div class="highlight"><pre><span></span><span class="linenos"> 1</span><span class="k">class</span> <span class="nc">TreeNode</span><span class="p">:</span>
<span class="linenos"> 2</span> <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">val</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">left</span><span class="o">=</span><span class="kc">None</span><span class="p">,</span> <span class="n">right</span><span class="o">=</span><span class="kc">None</span><span class="p">):</span>
<span class="linenos"> 3</span> <span class="bp">self</span><span class="o">.</span><span class="n">val</span> <span class="o">=</span> <span class="n">val</span>
<span class="linenos"> 4</span> <span class="bp">self</span><span class="o">.</span><span class="n">left</span> <span class="o">=</span> <span class="n">left</span>
<span class="linenos"> 5</span> <span class="bp">self</span><span class="o">.</span><span class="n">right</span> <span class="o">=</span> <span class="n">right</span>
<span class="linenos"> 6</span>
<span class="linenos"> 7</span><span class="k">class</span> <span class="nc">BSTIterator</span><span class="p">:</span>
<span class="linenos"> 8</span> <span class="k">def</span> <span class="fm">__init__</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="n">TreeNode</span><span class="p">):</span>
<span class="linenos"> 9</span> <span class="bp">self</span><span class="o">.</span><span class="n">root</span> <span class="o">=</span> <span class="n">root</span>
<span class="linenos">10</span> <span class="bp">self</span><span class="o">.</span><span class="n">iter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">root</span><span class="p">)</span>
<span class="linenos">11</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="o">=</span> <span class="kc">None</span>
<span class="linenos">12</span>
<span class="linenos">13</span> <span class="k">def</span> <span class="nf">dfs</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">n</span><span class="p">):</span>
<span class="linenos">14</span> <span class="k">if</span> <span class="n">n</span><span class="p">:</span>
<span class="linenos">15</span> <span class="k">yield from</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="n">n</span><span class="o">.</span><span class="n">left</span><span class="p">)</span>
<span class="linenos">16</span> <span class="k">yield</span> <span class="n">n</span><span class="o">.</span><span class="n">val</span>
<span class="linenos">17</span> <span class="k">yield from</span> <span class="bp">self</span><span class="o">.</span><span class="n">dfs</span><span class="p">(</span><span class="n">n</span><span class="o">.</span><span class="n">right</span><span class="p">)</span>
<span class="linenos">18</span>
<span class="linenos">19</span> <span class="k">def</span> <span class="nf">next</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="nb">int</span><span class="p">:</span>
<span class="linenos">20</span> <span class="sd">"""</span>
<span class="linenos">21</span><span class="sd"> Returns the next item if it's been cached,</span>
<span class="linenos">22</span><span class="sd"> else calls next.</span>
<span class="linenos">23</span><span class="sd"> """</span>
<span class="linenos">24</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span><span class="p">:</span>
<span class="linenos">25</span> <span class="n">tmp</span><span class="p">,</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span><span class="p">,</span> <span class="kc">None</span>
<span class="linenos">26</span> <span class="k">return</span> <span class="n">tmp</span>
<span class="linenos">27</span> <span class="k">return</span> <span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">iter</span><span class="p">)</span>
<span class="linenos">28</span>
<span class="linenos">29</span> <span class="k">def</span> <span class="nf">hasNext</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="nb">bool</span><span class="p">:</span>
<span class="linenos">30</span> <span class="sd">"""</span>
<span class="linenos">31</span><span class="sd"> Returns whether we have a next item in the iterator.</span>
<span class="linenos">32</span><span class="sd"> Does so by actually calling next, and storing the result</span>
<span class="linenos">33</span><span class="sd"> in a cache.</span>
<span class="linenos">34</span><span class="sd"> """</span>
<span class="linenos">35</span> <span class="k">if</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span>
<span class="linenos">36</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="o">=</span> <span class="nb">next</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">iter</span><span class="p">,</span> <span class="kc">None</span><span class="p">)</span>
<span class="linenos">37</span> <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">next_item</span> <span class="ow">is</span> <span class="ow">not</span> <span class="kc">None</span>
<span class="linenos">38</span>
</pre></div>
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