Solution: Next Greater Element IV
Explore how to solve the second greater element problem using stacks. This lesson guides you through maintaining two stacks to track elements awaiting their first and second greater values, enabling a linear time and space complexity solution. By understanding this method, you will efficiently implement the approach in C++ and improve problem-solving skills for coding interviews.
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:
...