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krahets
2023-07-26 08:59:03 +08:00
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chapter_searching/replace_linear_by_hashing/index.html
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<h2 id="1032">10.3.2. &nbsp; 哈希查找：以空间换时间<a class="headerlink" href="#1032" title="Permanent link">&para;</a></h2>
<p>考虑借助一个哈希表，键值对分别为数组元素和元素索引。循环遍历数组，每轮执行：</p>
<ol>
<li>判断数字 <code>target - nums[i]</code> 是否在哈希表中，若是则直接返回这两个元素的索引；</li>
<li>将键值对 <code>nums[i]</code> 和索引 <code>i</code> 添加进哈希表；</li>
<li>判断数字 <code>target - nums[i]</code> 是否在哈希表中，若是则直接返回这两个元素的索引。</li>
<li>将键值对 <code>nums[i]</code> 和索引 <code>i</code> 添加进哈希表。</li>
</ol>
<div class="tabbed-set tabbed-alternate" data-tabs="2:3"><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" /><div class="tabbed-labels"><label for="__tabbed_2_1">&lt;1&gt;</label><label for="__tabbed_2_2">&lt;2&gt;</label><label for="__tabbed_2_3">&lt;3&gt;</label></div>
<div class="tabbed-content">