This patch uses BFS to implement check_noncircular() and
prints the generated shortest circle if exists.
Signed-off-by: NMing Lei <tom.leiming@gmail.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1246201486-7308-5-git-send-email-tom.leiming@gmail.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>