Web Reference: In-depth solution and explanation for LeetCode 456. 132 Pattern in Python, Java, C++ and more. Intuitions, example walk through, and complexity analysis. Better than official and forum solutions. Given an array of n integers nums, a 132 pattern is a subsequence of three integers nums[i], nums[j] and nums[k] such that i < j < k and nums[i] < nums[k] < nums[j]. The key insight is to track k, which represents the largest valid "2" in a potential 132 pattern (the middle value that's smaller than some "3" to its right). We use a stack to maintain elements in decreasing order.
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