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Grokking the Coding Interview Patterns in Go

Solution: Next Greater Element IV

Explore the stack-based approach to solve the Next Greater Element IV problem. Learn to track elements waiting for their first and second greater values using two stacks. Understand how to update results efficiently while maintaining linear time and space complexity.

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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:

  • ...