Problem: Increasing Triplet Subsequence
Explore how to find an increasing triplet subsequence within an integer array by using a single linear scan approach. Understand how to maintain two variables to track the smallest and the second smallest elements for an efficient O(n) time and constant space solution. This lesson helps you implement an algorithm that confirms the existence of a strictly increasing triplet with optimal complexity.
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Statement
Given an integer array nums, determine whether there exist three indices (i, j, k) such that i < j < k and nums[i] < nums[j] < nums[k]. Return true if such a strictly increasing triplet subsequence exists, and false otherwise.
Note: Can you implement a solution that runs in
O(n)time complexity andO(1)space complexity?
Constraints:
nums.length...