OJ Board

@goodwill I sent an e-mail to Miguel yesterday. I think they will fix it as soon as they can.

Sorry for everyone who are in trouble after getting wa with their correct code.

The output file is currently wrong. I am getting ac with my buggy code while my correct solution is giving wa. We sent a wrong version of the data file. But during the contest we corrected the output file. But in online judge it has not been corrected yet.

mf wrote:I guess the test cases in the input aren't too tough.
I've used backtracking with some pruning to generate every independent set, and it got just ~0.6 seconds.

The maximum answer can be 2^30. So a backtracking solution should not work for such limits.