Given a table of rules, write a function to check if it contains conflicting rules. Two rules are conflicting if their conditions match but values do not. Conditions can contain don't cares denoted by '-'. Has to be done in O(n) time.

e.g
Rule Conditions Value
R1 C1,C2,C3 40
R2 BCD1,BC5 40
R3 BCD1,BC5 80
Here, R2 and R3 conflict.
e.g
R1 C1,C2,C3 40
R2 BCD1,BC5 50
R3 BCD1,- 50
R6 -,-,C3 40
No conflicts.