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Data Structures for Coding Interviews in Java

Solution: Next Greater Element Using a Stack

Explore how to implement the nextGreaterElement function using a stack in Java. Understand the step-by-step approach to find the next greater number for each element in an array efficiently. This lesson guides you through the algorithm, its iteration process, and complexity analysis to help you master stack-based problem solving for coding interviews.

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Statement

Implement a nextGreaterElement() function that takes an array of integers, arr, as input and returns the next greater number for every element in the array.

The next greater number for a number arr[i] is the first number to its right that is greater than arr[i]. If no such number exists, return -1 for this number.

Constraints:

  • 1≤1 \leq arr.length ≤103
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