Next greater element

Question

This is the problem I have solved for days called Next greater element. I know the logic but cannot get the code correct.
https://code.sololearn.com/ctCBgSBeMX6S/?ref=app

Answer 1

What is your code supposed to do? What's the logic behind it?

Answer 2

if the next element greater than the current element, you print out the next one. if the next is < the current, the next becomes -1.