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<p>We can use a hash table $\textit{d}$ to store each element and its corresponding index.</p>
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<p>Traverse the array $\textit{nums}$, for the current element $\textit{nums}[i]$, we first check if $\textit{target} - \textit{nums}[i]$ is in the hash table $\textit{d}$. If it is in $\textit{d}$, it means the $\textit{target}$ value has been found, and we return the indices of $\textit{target} - \textit{nums}[i]$ and $i$.</p>
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<p>Time complexity is $O(n)$, and space complexity is $O(n)$, where $n$ is the length of the array $\textit{nums}$.</p>
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<div class="tabbed-set tabbed-alternate" data-tabs="1:13"><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" /><input id="__tabbed_1_9" name="__tabbed_1" type="radio" /><input id="__tabbed_1_10" name="__tabbed_1" type="radio" /><input id="__tabbed_1_11" name="__tabbed_1" type="radio" /><input id="__tabbed_1_12" name="__tabbed_1" type="radio" /><input id="__tabbed_1_13" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Python3</label><label for="__tabbed_1_2">Java</label><label for="__tabbed_1_3">C++</label><label for="__tabbed_1_4">Go</label><label for="__tabbed_1_5">TypeScript</label><label for="__tabbed_1_6">Rust</label><label for="__tabbed_1_7">JavaScript</label><label for="__tabbed_1_8">C#</label><label for="__tabbed_1_9">PHP</label><label for="__tabbed_1_10">Scala</label><label for="__tabbed_1_11">Swift</label><label for="__tabbed_1_12">Ruby</label><label for="__tabbed_1_13">Nim</label></div>
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<div class="tabbed-set tabbed-alternate" data-tabs="1:14"><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" /><input id="__tabbed_1_9" name="__tabbed_1" type="radio" /><input id="__tabbed_1_10" name="__tabbed_1" type="radio" /><input id="__tabbed_1_11" name="__tabbed_1" type="radio" /><input id="__tabbed_1_12" name="__tabbed_1" type="radio" /><input id="__tabbed_1_13" name="__tabbed_1" type="radio" /><input id="__tabbed_1_14" name="__tabbed_1" type="radio" /><div class="tabbed-labels"><label for="__tabbed_1_1">Python3</label><label for="__tabbed_1_2">Java</label><label for="__tabbed_1_3">C++</label><label for="__tabbed_1_4">Go</label><label for="__tabbed_1_5">TypeScript</label><label for="__tabbed_1_6">Rust</label><label for="__tabbed_1_7">JavaScript</label><label for="__tabbed_1_8">C#</label><label for="__tabbed_1_9">PHP</label><label for="__tabbed_1_10">Scala</label><label for="__tabbed_1_11">Swift</label><label for="__tabbed_1_12">Ruby</label><label for="__tabbed_1_13">Nim</label><label for="__tabbed_1_14">Kotlin</label></div>
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<div class="tabbed-content">
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<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal">1</span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="o">@[]</span>
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</code></pre></div></td></tr></table></div>
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</div>
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<div class="tabbed-block">
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<div class="highlight"><table class="highlighttable"><tr><td class="linenos"><div class="linenodiv"><pre><span></span><span class="normal"> 1</span>
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<span class="normal">14</span></pre></div></td><td class="code"><div><pre><span></span><code><span class="kd">class</span><span class="w"> </span><span class="nc">Solution</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="kd">fun</span><span class="w"> </span><span class="nf">twoSum</span><span class="p">(</span><span class="n">nums</span><span class="p">:</span><span class="w"> </span><span class="n">IntArray</span><span class="p">,</span><span class="w"> </span><span class="n">target</span><span class="p">:</span><span class="w"> </span><span class="kt">Int</span><span class="p">):</span><span class="w"> </span><span class="n">IntArray</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="kd">val</span><span class="w"> </span><span class="nv">m</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">mutableMapOf</span><span class="o">&lt;</span><span class="kt">Int</span><span class="p">,</span><span class="w"> </span><span class="kt">Int</span><span class="o">&gt;</span><span class="p">()</span>
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<span class="w"> </span><span class="n">nums</span><span class="p">.</span><span class="na">forEachIndexed</span><span class="w"> </span><span class="p">{</span><span class="w"> </span><span class="n">i</span><span class="p">,</span><span class="w"> </span><span class="n">x</span><span class="w"> </span><span class="o">-&gt;</span>
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<span class="w"> </span><span class="kd">val</span><span class="w"> </span><span class="nv">y</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">target</span><span class="w"> </span><span class="o">-</span><span class="w"> </span><span class="n">x</span>
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<span class="w"> </span><span class="kd">val</span><span class="w"> </span><span class="nv">j</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">m</span><span class="p">.</span><span class="na">get</span><span class="p">(</span><span class="n">y</span><span class="p">)</span>
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<span class="w"> </span><span class="k">if</span><span class="w"> </span><span class="p">(</span><span class="n">j</span><span class="w"> </span><span class="o">!=</span><span class="w"> </span><span class="kc">null</span><span class="p">)</span><span class="w"> </span><span class="p">{</span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">intArrayOf</span><span class="p">(</span><span class="n">j</span><span class="p">,</span><span class="w"> </span><span class="n">i</span><span class="p">)</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="n">m</span><span class="o">[</span><span class="n">x</span><span class="o">]</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="n">i</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="w"> </span><span class="k">return</span><span class="w"> </span><span class="n">intArrayOf</span><span class="p">()</span>
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<span class="w"> </span><span class="p">}</span>
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<span class="p">}</span>
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</code></pre></div></td></tr></table></div>
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</div>
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</div>
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<a href="https://github.com/Zuoqiu-Yingyi" class="md-author" title="@Zuoqiu-Yingyi">
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</a>
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<a href="https://github.com/yanglbme" class="md-author" title="@yanglbme">
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<img src="https://avatars.githubusercontent.com/u/44314231?v=4&size=72" alt="acbin">
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<a href="https://github.com/doocs/leetcode/blob/main/solution/0000-0099/0001.Two%20Sum/README_EN.md" class="md-author md-author--more">
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