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  1. /* package whatever; // count no of pairs in ana array that sum up to given k elementt */
  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. 		       int[] a={1,2,3,4,5};
  13.          int b=5;
  14.         //String  b="god";
  15.         int tt=pair(a,b);
  16.       //  int[][] matrix = {
  17.               //  {1, 2, 3},
  18.             //    {4, 5, 6},
  19.                 //{7, 8, 9}
  20.         //};
  21.         System.out.println((tt));
  22.         //swap(a,b);
  23.             }
  24.  
  25. 		  public static int pair(int[] arr,int k){
  26.         int count=0;
  27.         for(int i=0;i<arr.length;i++){
  28.             for(int j=i+1;j<arr.length;j++){
  29.                 if(arr[i]+arr[j]==k){
  30.                     count++;
  31.                 }
  32.             }
  33.         }
  34.         return count;
  35. 	}
  36. }
Success #stdin #stdout 0.09s 54500KB
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https://ideone.com/Wmpd8v
language:
Java (HotSpot 12)
created:
10 days ago
visibility:
public

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