Solution: Next Greater Element IV
Explore the stack data structure approach to solve the Next Greater Element IV problem. This lesson helps you understand how to efficiently find the second greater element for each number in an array using two stacks, ensuring a linear time solution. You'll develop skills to track elements in different states and optimize your coding solutions for interview success.
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Statement
You are given a 0-indexed array of non-negative integers nums. For each element nums[i], determine its second greater element and return an array res where res[i] contains the second greater element of nums[i].
The second greater element of
nums[i]is defined as the valuenums[j]such that:
j > i
nums[j] > nums[i]There exists exactly one index
kwherei < k < jandnums[k] > nums[i]If no such index
jexists, then the second greater element fornums[i]is-1.
Constraints:
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