Leetcode Problem 2454. Next Greater Element IV

2454. Next Greater Element IV

Leetcode Solutions

Java Queues O(n)

  1. Initialize two empty LinkedLists s1 and s2 to act as queues.
  2. Initialize an array ans of the same length as nums with all elements set to -1.
  3. Iterate through each element in nums: a. For each element nums[i], pop elements from s2 while nums[i] is greater than the elements at those indices and set ans for those indices to nums[i]. b. Move elements from s1 to s2 while nums[i] is greater than the elements at those indices in s1. c. Add the current index i to s1.
  4. Return the ans array.
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