Solution: Next Greater Element IV
Explore how to solve the next greater element IV problem using stacks. Understand how to efficiently track elements waiting for their first and second greater values with a two-stack method. This lesson guides you through implementing a linear-time solution that updates results as you iterate through the array, improving your problem-solving skills with stacks.
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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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