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24 lines
943 B
HTML
24 lines
943 B
HTML
<p>Given a <strong>non-empty</strong> array of integers <code>nums</code>, every element appears <em>twice</em> except for one. Find that single one.</p>
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<p>You must implement a solution with a linear runtime complexity and use only constant extra space.</p>
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<p> </p>
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<p><strong>Example 1:</strong></p>
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<pre><strong>Input:</strong> nums = [2,2,1]
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<strong>Output:</strong> 1
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</pre><p><strong>Example 2:</strong></p>
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<pre><strong>Input:</strong> nums = [4,1,2,1,2]
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<strong>Output:</strong> 4
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</pre><p><strong>Example 3:</strong></p>
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<pre><strong>Input:</strong> nums = [1]
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<strong>Output:</strong> 1
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</pre>
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<p> </p>
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<p><strong>Constraints:</strong></p>
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<ul>
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<li><code>1 <= nums.length <= 3 * 10<sup>4</sup></code></li>
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<li><code>-3 * 10<sup>4</sup> <= nums[i] <= 3 * 10<sup>4</sup></code></li>
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<li>Each element in the array appears twice except for one element which appears only once.</li>
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</ul>
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