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40 lines
1.5 KiB
HTML
40 lines
1.5 KiB
HTML
<p>You are given an integer array <code>nums</code>. A subsequence of <code>nums</code> is called a <strong>square streak</strong> if:</p>
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<ul>
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<li>The length of the subsequence is at least <code>2</code>, and</li>
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<li><strong>after</strong> sorting the subsequence, each element (except the first element) is the <strong>square</strong> of the previous number.</li>
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</ul>
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<p>Return<em> the length of the <strong>longest square streak</strong> in </em><code>nums</code><em>, or return </em><code>-1</code><em> if there is no <strong>square streak</strong>.</em></p>
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<p>A <strong>subsequence</strong> is an array that can be derived from another array by deleting some or no elements without changing the order of the remaining elements.</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 = [4,3,6,16,8,2]
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<strong>Output:</strong> 3
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<strong>Explanation:</strong> Choose the subsequence [4,16,2]. After sorting it, it becomes [2,4,16].
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- 4 = 2 * 2.
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- 16 = 4 * 4.
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Therefore, [4,16,2] is a square streak.
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It can be shown that every subsequence of length 4 is not a square streak.
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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 = [2,3,5,6,7]
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<strong>Output:</strong> -1
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<strong>Explanation:</strong> There is no square streak in nums so return -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>2 <= nums.length <= 10<sup>5</sup></code></li>
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<li><code>2 <= nums[i] <= 10<sup>5</sup></code></li>
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</ul>
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