Solution: Next Greater Element IV
Explore how to efficiently find the second greater element for each item in a numeric array by using two stacks to track first and second greater elements. This lesson helps you understand the algorithm's mechanics, achieve O(n) time complexity, and implement the solution confidently.
We'll cover the following...
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 valuenums[j]such that:
j > i
nums[j] > nums[i]There exists exactly one index
kwherei < k < jandnums[k] > nums[i]If no such index
jexists, then the second greater element fornums[i]is-1.
Constraints:
...