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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. /* Name of the class has to be "Main" only if the class is public. */
  8. class Ideone
  9. {
  10. 	public static void main (String[] args) throws java.lang.Exception
  11. 	{
  12. 		// your code goes here
  13. 		Scanner sc = new Scanner(System.in);
  14. 		int n = sc.nextInt();
  15. 		int arr[] = new int[n];
  16. 		for(int i=0; i<n; i++){
  17. 			arr[i] = sc.nextInt();
  18. 		}
  19. 		int target = sc.nextInt();
  20.  
  21. 		HashSet<Integer> set = new HashSet<>();
  22. 		boolean result = false;
  23. 		for(int i=0; i<n; i++){
  24. 			int val = target-arr[i];
  25. 			if(set.contains(val)){
  26. 				result = true;
  27. 				System.out.println("Pair : "+"{"+val+","+arr[i]+"}");
  28. 			}
  29. 			set.add(arr[i]);
  30. 		}
  31.  
  32. 		System.out.println(result);
  33.  
  34. 	}
  35. }
Success #stdin #stdout 0.18s 60872KB
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stdin
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5
0 -1 2 -3 1
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stdout
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Pair : {-3,1}
true
https://ideone.com/unb04R
language:
Java (HotSpot 12)
created:
13 days ago
visibility:
public

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