Solution: Next Greater Element Using a Stack

Let’s solve the Next Greater Element Using a Stack problem.

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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}
  • 0≤0 \leq arr[i] ≤103\leq 10^{3}

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