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package JavaTest2; import java.util.HashSet; import java.util.Scanner; import java.util.Set; public class HashSetPair { public static void main(String[] args) { Scanner s = new Scanner(System.in); int t = s.nextInt(); String[] pair_left = new String[t]; String[] pair_right = new String[t]; for (int i = 0; i < t; i++) { pair_left[i] = s.next(); pair_right[i] = s.next(); } Set<String> pairs = new HashSet<>(); int pairCount = 0; for (int i = 0; i < t; i++) { pairs.add(pair_left[i] + " " + pair_right[i]); pairCount = pairs.size(); System.out.println(pairCount); } } }
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