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.
To get a more precise calculation of how often you should eat fish, check out the National Resources Defense Council's Mercury Contamination in Fish-Consumer Guide to Mercury in Fish.he American Heart Association even recommends eating a variety of fish, preferably oily fish (e.g., salmon, tuna, herring, etc.), at least twice a week. Most people can eat fish without being concerned, but pregnant and breastfeeding women and young children should be more careful.