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Problem: Next Greater Element IV

Medium
30 min
Explore how to determine the second greater element for each number in an array using stacks. This lesson helps you understand the problem constraints and implement a solution leveraging stack data structures, enhancing your ability to solve similar coding interview questions with efficiency and clarity.

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 determine the second greater element for each number in an array using stacks. This lesson helps you understand the problem constraints and implement a solution leveraging stack data structures, enhancing your ability to solve similar coding interview questions with efficiency and clarity.

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