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<h1 id="61">6.1. &nbsp; 二分查找<a class="headerlink" href="#61" title="Permanent link">&para;</a></h1>
<p>「二分查找 Binary Search」是一种基于分治思想的高效搜索算法。它利用数据的有序性每轮减少一半搜索范围实现定位目标元素</p>
<p>「二分查找 Binary Search」是一种基于分治思想的高效搜索算法。它利用数据的有序性每轮减少一半搜索范围直至找到目标元素或搜索区间为空为止</p>
<p>我们先来求解一个简单的二分查找问题。</p>
<div class="admonition question">
<p class="admonition-title">给定一个长度为 <span class="arithmatex">\(n\)</span> 的有序数组 <code>nums</code> ,元素按从小到大的顺序排列。查找并返回元素 <code>target</code> 在该数组中的索引。若数组中不包含该元素,则返回 <span class="arithmatex">\(-1\)</span> 。数组中不包含重复元素。</p>
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<p><strong>若数组不包含目标元素,搜索区间最终会缩小为空</strong>,即达到 <span class="arithmatex">\(i &gt; j\)</span> 。此时,终止循环并返回 <span class="arithmatex">\(-1\)</span> 即可。</p>
<p>为了更清晰地表示区间,我们在下图中以折线图的形式表示数组。</p>
<p>如下图所示,为了更清晰地表示区间,我们以折线图的形式表示数组。</p>
<div class="tabbed-set tabbed-alternate" data-tabs="1:8"><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" /><input id="__tabbed_1_5" name="__tabbed_1" type="radio" /><input id="__tabbed_1_6" name="__tabbed_1" type="radio" /><input id="__tabbed_1_7" name="__tabbed_1" type="radio" /><input id="__tabbed_1_8" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">&lt;0&gt;</label><label for="__tabbed_1_2">&lt;1&gt;</label><label for="__tabbed_1_3">&lt;2&gt;</label><label for="__tabbed_1_4">&lt;3&gt;</label><label for="__tabbed_1_5">&lt;4&gt;</label><label for="__tabbed_1_6">&lt;5&gt;</label><label for="__tabbed_1_7">&lt;6&gt;</label><label for="__tabbed_1_8">&lt;7&gt;</label></div>
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<p>值得注意的是,<strong>当数组长度 <span class="arithmatex">\(n\)</span> 很大时,加法 <span class="arithmatex">\(i + j\)</span> 的结果可能会超出 <code>int</code> 类型的取值范围</strong>。为了避免大数越界,我们通常采用公式 <span class="arithmatex">\(m = \lfloor {i + (j - i) / 2} \rfloor\)</span> 来计算中点。</p>
<p>有趣的是,理论上 Python 的数字可以无限大(取决于内存大小),因此无需考虑大数越界问题。</p>
<div class="tabbed-set tabbed-alternate" data-tabs="2:10"><input checked="checked" id="__tabbed_2_1" name="__tabbed_2" type="radio" /><input id="__tabbed_2_2" name="__tabbed_2" type="radio" /><input id="__tabbed_2_3" name="__tabbed_2" type="radio" /><input id="__tabbed_2_4" name="__tabbed_2" type="radio" /><input id="__tabbed_2_5" name="__tabbed_2" type="radio" /><input id="__tabbed_2_6" name="__tabbed_2" type="radio" /><input id="__tabbed_2_7" name="__tabbed_2" type="radio" /><input id="__tabbed_2_8" name="__tabbed_2" type="radio" /><input id="__tabbed_2_9" name="__tabbed_2" type="radio" /><input id="__tabbed_2_10" name="__tabbed_2" type="radio" /><div class="tabbed-labels"><label for="__tabbed_2_1">Java</label><label for="__tabbed_2_2">C++</label><label for="__tabbed_2_3">Python</label><label for="__tabbed_2_4">Go</label><label for="__tabbed_2_5">JavaScript</label><label for="__tabbed_2_6">TypeScript</label><label for="__tabbed_2_7">C</label><label for="__tabbed_2_8">C#</label><label for="__tabbed_2_9">Swift</label><label for="__tabbed_2_10">Zig</label></div>
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<a id="__codelineno-2-4" name="__codelineno-2-4" href="#__codelineno-2-4"></a> <span class="n">i</span><span class="p">,</span> <span class="n">j</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="nb">len</span><span class="p">(</span><span class="n">nums</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span>
<a id="__codelineno-2-5" name="__codelineno-2-5" href="#__codelineno-2-5"></a> <span class="c1"># 循环,当搜索区间为空时跳出(当 i &gt; j 时为空)</span>
<a id="__codelineno-2-6" name="__codelineno-2-6" href="#__codelineno-2-6"></a> <span class="k">while</span> <span class="n">i</span> <span class="o">&lt;=</span> <span class="n">j</span><span class="p">:</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a> <span class="n">m</span> <span class="o">=</span> <span class="p">(</span><span class="n">i</span> <span class="o">+</span> <span class="n">j</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span> <span class="c1"># 计算中点索引 m</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="k">if</span> <span class="n">nums</span><span class="p">[</span><span class="n">m</span><span class="p">]</span> <span class="o">&lt;</span> <span class="n">target</span><span class="p">:</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="n">i</span> <span class="o">=</span> <span class="n">m</span> <span class="o">+</span> <span class="mi">1</span> <span class="c1"># 此情况说明 target 在区间 [m+1, j] 中</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> <span class="k">elif</span> <span class="n">nums</span><span class="p">[</span><span class="n">m</span><span class="p">]</span> <span class="o">&gt;</span> <span class="n">target</span><span class="p">:</span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="n">j</span> <span class="o">=</span> <span class="n">m</span> <span class="o">-</span> <span class="mi">1</span> <span class="c1"># 此情况说明 target 在区间 [i, m-1] 中</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> <span class="k">else</span><span class="p">:</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> <span class="k">return</span> <span class="n">m</span> <span class="c1"># 找到目标元素,返回其索引</span>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> <span class="k">return</span> <span class="o">-</span><span class="mi">1</span> <span class="c1"># 未找到目标元素,返回 -1</span>
<a id="__codelineno-2-7" name="__codelineno-2-7" href="#__codelineno-2-7"></a> <span class="c1"># 理论上 Python 的数字可以无限大(取决于内存大小),无需考虑大数越界问题</span>
<a id="__codelineno-2-8" name="__codelineno-2-8" href="#__codelineno-2-8"></a> <span class="n">m</span> <span class="o">=</span> <span class="p">(</span><span class="n">i</span> <span class="o">+</span> <span class="n">j</span><span class="p">)</span> <span class="o">//</span> <span class="mi">2</span> <span class="c1"># 计算中点索引 m</span>
<a id="__codelineno-2-9" name="__codelineno-2-9" href="#__codelineno-2-9"></a> <span class="k">if</span> <span class="n">nums</span><span class="p">[</span><span class="n">m</span><span class="p">]</span> <span class="o">&lt;</span> <span class="n">target</span><span class="p">:</span>
<a id="__codelineno-2-10" name="__codelineno-2-10" href="#__codelineno-2-10"></a> <span class="n">i</span> <span class="o">=</span> <span class="n">m</span> <span class="o">+</span> <span class="mi">1</span> <span class="c1"># 此情况说明 target 在区间 [m+1, j] 中</span>
<a id="__codelineno-2-11" name="__codelineno-2-11" href="#__codelineno-2-11"></a> <span class="k">elif</span> <span class="n">nums</span><span class="p">[</span><span class="n">m</span><span class="p">]</span> <span class="o">&gt;</span> <span class="n">target</span><span class="p">:</span>
<a id="__codelineno-2-12" name="__codelineno-2-12" href="#__codelineno-2-12"></a> <span class="n">j</span> <span class="o">=</span> <span class="n">m</span> <span class="o">-</span> <span class="mi">1</span> <span class="c1"># 此情况说明 target 在区间 [i, m-1] 中</span>
<a id="__codelineno-2-13" name="__codelineno-2-13" href="#__codelineno-2-13"></a> <span class="k">else</span><span class="p">:</span>
<a id="__codelineno-2-14" name="__codelineno-2-14" href="#__codelineno-2-14"></a> <span class="k">return</span> <span class="n">m</span> <span class="c1"># 找到目标元素,返回其索引</span>
<a id="__codelineno-2-15" name="__codelineno-2-15" href="#__codelineno-2-15"></a> <span class="k">return</span> <span class="o">-</span><span class="mi">1</span> <span class="c1"># 未找到目标元素,返回 -1</span>
</code></pre></div>
</div>
<div class="tabbed-block">
@ -2386,12 +2402,12 @@
<p align="center"> Fig. 两种区间定义 </p>
<h2 id="612">6.1.2. &nbsp; 优点与局限性<a class="headerlink" href="#612" title="Permanent link">&para;</a></h2>
<p>二分查找效率很高,主要体现在:</p>
<p>二分查找在时间和空间方面都有较好的性能</p>
<ul>
<li><strong>二分查找的时间复杂度较低</strong>对数阶在大数据量情况下具有显著优势。例如,当数据大小 <span class="arithmatex">\(n = 2^{20}\)</span> 时,线性查找需要 <span class="arithmatex">\(2^{20} = 1048576\)</span> 轮循环,而二分查找仅需 <span class="arithmatex">\(\log_2 2^{20} = 20\)</span> 轮循环。</li>
<li><strong>二分查找无需额外空间</strong>与哈希查找相比,二分查找更加节省空间。</li>
<li><strong>二分查找的时间效率高</strong>。在大数据量下,对数阶的时间复杂度具有显著优势。例如,当数据大小 <span class="arithmatex">\(n = 2^{20}\)</span> 时,线性查找需要 <span class="arithmatex">\(2^{20} = 1048576\)</span> 轮循环,而二分查找仅需 <span class="arithmatex">\(\log_2 2^{20} = 20\)</span> 轮循环。</li>
<li><strong>二分查找无需额外空间</strong>相较于需要借助额外空间的搜索算法(例如哈希查找),二分查找更加节省空间。</li>
</ul>
<p>然而,并非所有情况下都可使用二分查找,原因如下:</p>
<p>然而,二分查找并非适用于所有情况,原因如下:</p>
<ul>
<li><strong>二分查找仅适用于有序数据</strong>。若输入数据无序,为了使用二分查找而专门进行排序,得不偿失。因为排序算法的时间复杂度通常为 <span class="arithmatex">\(O(n \log n)\)</span> ,比线性查找和二分查找都更高。对于频繁插入元素的场景,为保持数组有序性,需要将元素插入到特定位置,时间复杂度为 <span class="arithmatex">\(O(n)\)</span> ,也是非常昂贵的。</li>
<li><strong>二分查找仅适用于数组</strong>。二分查找需要跳跃式(非连续地)访问元素,而在链表中执行跳跃式访问的效率较低,因此不适合应用在链表或基于链表实现的数据结构。</li>
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