Every input line of the combinational circuit represents an individual element of the string say xi and every output line results in the form of a sorted list. In order to attain the above given task, a comparator is employed for the processing.

Every comparator has two input lines, say a and b, and likewise two output lines, say c and d. Every comparator provides two outputs i.e., c provides maximum of a and b (max Parallel Algorithms & Parallel Programming (a, b)) and d gives minimum of a and b (min (a, b)) in comparator InC and DeC it is opposite, as shown given Figure.

In general, there are two types of comparators, often called as increasing comparators and decreasing comparators indicated by + BM(n) and - BM(n) where n indicates the number of input lines and output lines of the comparator. The depth of + BM (n) and - BM (n) is log n. These comparators are engaged for constructing the circuit of sorting.

                                                       Decreasing Comparator, for n inputs