In computer science, a set is an abstract data type that can store certain values, without any particular order, and no repeated values(Wikipedia). is an example of a set, but is not a set. Today you will learn how to use sets in java by solving this problem.
You are given pairs of strings. Two pairs and are identical if and . That also implies is not same as . After taking each pair as input, you need to print number of unique pairs you currently have.
Complete the code in the editor to solve this problem.
In the first line, there will be an integer denoting number of pairs. Each of the next lines will contain two strings seperated by a single space.
Length of each string is atmost and will consist lower case letters only.
Print lines. In the line, print number of unique pairs you have after taking pair as input.
After taking the first input, you have only one pair: (john,tom)
After taking the second input, you have two pairs: (john, tom) and (john, mary)
After taking the third input, you still have two unique pairs.
After taking the fourth input, you have three unique pairs: (john,tom), (john, mary) and (mary, anna)
After taking the fifth input, you still have three unique pairs.