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2501-longest-square-streak-in-an-array/README.md

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+<h2><a href="https://leetcode.com/problems/longest-square-streak-in-an-array/?envType=daily-question&envId=2024-10-28">2501. Longest Square Streak in an Array</a></h2><h3>Medium</h3><hr><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>
+
+<ul>
+	<li>The length of the subsequence is at least <code>2</code>, and</li>
+	<li><strong>after</strong> sorting the subsequence, each element (except the first element) is the <strong>square</strong> of the previous number.</li>
+</ul>
+
+<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>
+
+<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>
+
+<p>&nbsp;</p>
+<p><strong class="example">Example 1:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [4,3,6,16,8,2]
+<strong>Output:</strong> 3
+<strong>Explanation:</strong> Choose the subsequence [4,16,2]. After sorting it, it becomes [2,4,16].
+- 4 = 2 * 2.
+- 16 = 4 * 4.
+Therefore, [4,16,2] is a square streak.
+It can be shown that every subsequence of length 4 is not a square streak.
+</pre>
+
+<p><strong class="example">Example 2:</strong></p>
+
+<pre>
+<strong>Input:</strong> nums = [2,3,5,6,7]
+<strong>Output:</strong> -1
+<strong>Explanation:</strong> There is no square streak in nums so return -1.
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>2 &lt;= nums.length &lt;= 10<sup>5</sup></code></li>
+	<li><code>2 &lt;= nums[i] &lt;= 10<sup>5</sup></code></li>
+</ul>