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456-132-pattern/README.md

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+<h2><a href="https://leetcode.com/problems/132-pattern/">456. 132 Pattern</a></h2><h3>Medium</h3><hr><div><p>Given an array of <code>n</code> integers <code>nums</code>, a <strong>132 pattern</strong> is a subsequence of three integers <code>nums[i]</code>, <code>nums[j]</code> and <code>nums[k]</code> such that <code>i &lt; j &lt; k</code> and <code>nums[i] &lt; nums[k] &lt; nums[j]</code>.</p>
+
+<p>Return <code>true</code><em> if there is a <strong>132 pattern</strong> in </em><code>nums</code><em>, otherwise, return </em><code>false</code><em>.</em></p>
+
+<p>&nbsp;</p>
+<p><strong>Example 1:</strong></p>
+
+<pre><strong>Input:</strong> nums = [1,2,3,4]
+<strong>Output:</strong> false
+<strong>Explanation:</strong> There is no 132 pattern in the sequence.
+</pre>
+
+<p><strong>Example 2:</strong></p>
+
+<pre><strong>Input:</strong> nums = [3,1,4,2]
+<strong>Output:</strong> true
+<strong>Explanation:</strong> There is a 132 pattern in the sequence: [1, 4, 2].
+</pre>
+
+<p><strong>Example 3:</strong></p>
+
+<pre><strong>Input:</strong> nums = [-1,3,2,0]
+<strong>Output:</strong> true
+<strong>Explanation:</strong> There are three 132 patterns in the sequence: [-1, 3, 2], [-1, 3, 0] and [-1, 2, 0].
+</pre>
+
+<p>&nbsp;</p>
+<p><strong>Constraints:</strong></p>
+
+<ul>
+	<li><code>n == nums.length</code></li>
+	<li><code>1 &lt;= n &lt;= 2 * 10<sup>5</sup></code></li>
+	<li><code>-10<sup>9</sup> &lt;= nums[i] &lt;= 10<sup>9</sup></code></li>
+</ul>
+</div>