print all possible solutions of N queen problem

Question

I have used this code for solving the problem but it gives me only one solution. How can i get all solutions.
https://code.sololearn.com/cA3A03A2A6A1

Answer 1

https://code.sololearn.com/cqwVmxNx4Rya/?ref=app

Answer 2

Thanks a lot. I was searching for it. Please can you explain also what changes you have made. Thanks in advance.