Solution: Next Greater Element IV
Understand how to identify the second greater element for each element in an array by using two stacks to track elements waiting for first and second greater values. This lesson teaches you an efficient O(n) time and space complexity method, leveraging stack operations for coding interview problem-solving.
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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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