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Data Structures for Coding Interviews in C++

Solution: Next Greater Element Using a Stack

Explore how to implement the NextGreaterElement function using a stack to efficiently find the next greater element for each item in an array. Understand the step-by-step algorithm, code implementation in C++, and the time and space complexity analysis to improve your problem-solving skills 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\leq 10^{3}
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