Idea & Solution: rsj
Idea & Solution: rsj
Idea & Solution: rsj
Idea & Solution: jiangtaizhe001
1787E - The Harmonization of XOR
Idea & Solution: jiangtaizhe001, rsj
1787F - Inverse Transformation
Idea & Solution: rsj, 275307894a
Idea & Solution: jiangtaizhe001, rsj
Idea & Solution: 275307894a
I'm really sorry for the unsatisfactory problems and the tough 3 hours ;)
However, I still hope you can enjoy the problems after the contest. The editorial hasn't been fully checked, so feel free to comment if there're errors, typos or you have questions about them. We'll check them out tomorrow. Thanks!