N-Queen Hard :Program was too slow for one test case

[saswat1908 (saswat srivastava)]

TLE for n>=13.
My solution works till n=12. Since the time complexity is n!.
Any suggestion for optimization. Please reply as soon as possible.

[Aarnav-Jindal-1059677350830863 (Aarnav Jindal)]

@saswat1908

Please see this