How we print -1

#1

how we print -1. since we check whether frequency of character is greater than 1. then we pop 1 character
and frequency become 1 then we print.
so queue can never get empty.

#2

@Adityakumar3112,
No, after toping the element, we don’t decrease its frequency. Thus if in a situation, when all frequencies are greater than 1, we will pop till queue is empty and then print -1.

#3

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