Solution: Next Greater Element IV
Explore how to implement a stack-based solution to find the second greater element for each item in an integer array. Understand the use of two stacks to track elements waiting for the first and second greater values, optimizing your approach to solve this problem in linear time and space complexity. This lesson enhances your skills in solving advanced interview coding challenges efficiently.
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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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