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37 lines
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37 lines
1.3 KiB
HTML
<p>Given an integer array <code>nums</code>, return <code>true</code><em> if there exists a triple of indices </em><code>(i, j, k)</code><em> such that </em><code>i < j < k</code><em> and </em><code>nums[i] < nums[j] < nums[k]</code>. If no such indices exists, return <code>false</code>.</p>
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<p> </p>
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<p><strong class="example">Example 1:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [1,2,3,4,5]
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<strong>Output:</strong> true
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<strong>Explanation:</strong> Any triplet where i < j < k is valid.
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</pre>
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<p><strong class="example">Example 2:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [5,4,3,2,1]
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<strong>Output:</strong> false
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<strong>Explanation:</strong> No triplet exists.
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</pre>
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<p><strong class="example">Example 3:</strong></p>
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<pre>
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<strong>Input:</strong> nums = [2,1,5,0,4,6]
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<strong>Output:</strong> true
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<strong>Explanation:</strong> The triplet (3, 4, 5) is valid because nums[3] == 0 < nums[4] == 4 < nums[5] == 6.
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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 <= 5 * 10<sup>5</sup></code></li>
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<li><code>-2<sup>31</sup> <= nums[i] <= 2<sup>31</sup> - 1</code></li>
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</ul>
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<p> </p>
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<strong>Follow up:</strong> Could you implement a solution that runs in <code>O(n)</code> time complexity and <code>O(1)</code> space complexity? |