Range Minimu Query: Given an array A[1,n] of n ordered objects (such as numbers), a Range Minimum Query (or RMQ) from i to j asks for the position of a minimum element in the sub-array A[i,j]. RMQs can be used to solve the lowest common ancestor problem.
The reasons that we do not eat or recommend shellfish are very similar. Shellfish are bottom feeders and feed on parasites and dead skin, many times from dead animals. They do not have appropriate digestive and filter systems to purify toxins and parasites from their body and flesh.
You should avoid eating swordfish, shark, king mackerel and tilefish. Predator fishes contain high amounts of mercury, so you should avoid these fish. Instead, consider eating fish like salmon, catfish, pollock, shrimp and canned light tuna. You can include about two meals of the fish in your diet every week.