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Problem: Next Greater Element IV

Medium
30 min
Explore how to solve the Next Greater Element IV problem by applying stack data structures to identify the second greater element for each value in an array. Learn to implement efficient solutions to a typical coding interview challenge, enhancing your ability to handle similar problems using stacks.

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

Problem
Ask
Submissions

Problem: Next Greater Element IV

Medium
30 min
Explore how to solve the Next Greater Element IV problem by applying stack data structures to identify the second greater element for each value in an array. Learn to implement efficient solutions to a typical coding interview challenge, enhancing your ability to handle similar problems using stacks.

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