I am trying to solve 1284D - New Year and Conference I used a randomized approach involving hashes. I assigned random numbers to each lecture and then calculated for each lecture the xor of numbers assigned to lectures it intersects with. Now I checked that every lecture has same hashes in first location (a) and second location (b)

Take a look at my submission : 68617652 I am getting WA on test 6.

Any advice would be greatly appreciated.

Thanks in advance :)