Challenge: Next Greater Element Using a Stack

Try to solve the Next Greater Element Using a Stack problem.

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Statement

Implement a next_greater_element() function that takes a list of integers, lst, as input and returns the next greater number for every element in the list.

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

Constraints:

  • 1≤1 \leq lst.length ≤103\leq 10^{3}
  • 0≤0 \leq lst[i] ≤103\leq 10^{3}

Examples

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