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Problem: Next Greater Element IV

hard
40 min
Explore how to apply stack data structures to solve the Next Greater Element IV problem efficiently. Understand the concept of the second greater element, implement the solution, and strengthen your skills in handling array-based challenges common in coding interviews.

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:

  • 11 \leq nums.length 105\leq 10^5

  • 00 \leq nums[i] 109\leq 10^9

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Tap here to switch tabs
Problem
Submissions

Problem: Next Greater Element IV

hard
40 min
Explore how to apply stack data structures to solve the Next Greater Element IV problem efficiently. Understand the concept of the second greater element, implement the solution, and strengthen your skills in handling array-based challenges common in coding interviews.

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:

  • 11 \leq nums.length 105\leq 10^5

  • 00 \leq nums[i] 109\leq 10^9

Unlock AI-Powered LearningUpgrade to smarter learning with instant explanations of Ask Agent, Personalized Interview Prep, Real-World Projects, 3 AI Mock Interviews per month, and Personalized Paths