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leetcode-cn/problem (English)/存在重复元素(English) [contains-duplicate].html
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<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<pre><strong>Input:</strong> nums = [1,2,3,1]
<strong>Output:</strong> true
</pre><p><strong class="example">Example 2:</strong></p>
<pre><strong>Input:</strong> nums = [1,2,3,4]
<strong>Output:</strong> false
</pre><p><strong class="example">Example 3:</strong></p>
<pre><strong>Input:</strong> nums = [1,1,1,3,3,4,3,2,4,2]
<strong>Output:</strong> true
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [1,2,3,1]</span></p>
<p><strong>Output:</strong> <span class="example-io">true</span></p>
<p><strong>Explanation:</strong></p>
<p>The element 1 occurs at the indices 0 and 3.</p>
</div>
<p><strong class="example">Example 2:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [1,2,3,4]</span></p>
<p><strong>Output:</strong> <span class="example-io">false</span></p>
<p><strong>Explanation:</strong></p>
<p>All elements are distinct.</p>
</div>
<p><strong class="example">Example 3:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">nums = [1,1,1,3,3,4,3,2,4,2]</span></p>
<p><strong>Output:</strong> <span class="example-io">true</span></p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>