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Grokking the Coding Interview Patterns in JavaScript

Solution: Next Greater Element IV

Explore a stack-based approach to solve the Next Greater Element IV problem. Understand how to use two stacks to track elements waiting for their first and second greater elements. Gain skills in optimizing time and space complexity for interview coding challenges.

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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 value nums[j] such that:

  • j > i

  • nums[j] > nums[i]

  • There exists exactly one index k where i < k < j and nums[k] > nums[i]

If no such index j exists, then the second greater element for nums[i] is -1.

Constraints:

  • ...