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krahets
2024-03-21 04:22:16 +08:00
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chapter_divide_and_conquer/build_binary_tree_problem/index.html
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@@ -3889,7 +3889,7 @@
<a id="__codelineno-5-20" name="__codelineno-5-20" href="#__codelineno-5-20"></a><span class="kd">func</span> <span class="nf">buildTree</span><span class="p">(</span><span class="n">preorder</span><span class="p">:</span> <span class="p">[</span><span class="nb">Int</span><span class="p">],</span> <span class="n">inorder</span><span class="p">:</span> <span class="p">[</span><span class="nb">Int</span><span class="p">])</span> <span class="p">-&gt;</span> <span class="n">TreeNode</span><span class="p">?</span> <span class="p">{</span>
<a id="__codelineno-5-21" name="__codelineno-5-21" href="#__codelineno-5-21"></a> <span class="c1">// 初始化哈希表，存储 inorder 元素到索引的映射</span>
<a id="__codelineno-5-22" name="__codelineno-5-22" href="#__codelineno-5-22"></a> <span class="kd">let</span> <span class="nv">inorderMap</span> <span class="p">=</span> <span class="n">inorder</span><span class="p">.</span><span class="n">enumerated</span><span class="p">().</span><span class="bp">reduce</span><span class="p">(</span><span class="n">into</span><span class="p">:</span> <span class="p">[:])</span> <span class="p">{</span> <span class="nv">$0</span><span class="p">[</span><span class="nv">$1</span><span class="p">.</span><span class="n">element</span><span class="p">]</span> <span class="p">=</span> <span class="nv">$1</span><span class="p">.</span><span class="n">offset</span> <span class="p">}</span>
<a id="__codelineno-5-23" name="__codelineno-5-23" href="#__codelineno-5-23"></a> <span class="k">return</span> <span class="n">dfs</span><span class="p">(</span><span class="n">preorder</span><span class="p">:</span> <span class="n">preorder</span><span class="p">,</span> <span class="n">inorderMap</span><span class="p">:</span> <span class="n">inorderMap</span><span class="p">,</span> <span class="n">i</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="n">l</span><span class="p">:</span> <span class="mi">0</span><span class="p">,</span> <span class="n">r</span><span class="p">:</span> <span class="n">inorder</span><span class="p">.</span><span class="bp">count</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
<a id="__codelineno-5-23" name="__codelineno-5-23" href="#__codelineno-5-23"></a> <span class="k">return</span> <span class="n">dfs</span><span class="p">(</span><span class="n">preorder</span><span class="p">:</span> <span class="n">preorder</span><span class="p">,</span> <span class="n">inorderMap</span><span class="p">:</span> <span class="n">inorderMap</span><span class="p">,</span> <span class="n">i</span><span class="p">:</span> <span class="n">inorder</span><span class="p">.</span><span class="n">startIndex</span><span class="p">,</span> <span class="n">l</span><span class="p">:</span> <span class="n">inorder</span><span class="p">.</span><span class="n">startIndex</span><span class="p">,</span> <span class="n">r</span><span class="p">:</span> <span class="n">inorder</span><span class="p">.</span><span class="n">endIndex</span> <span class="o">-</span> <span class="mi">1</span><span class="p">)</span>
<a id="__codelineno-5-24" name="__codelineno-5-24" href="#__codelineno-5-24"></a><span class="p">}</span>
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