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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. 		// size of arr1
  15. 		int n=sc.nextInt();
  16.  
  17. 		// size of arr2
  18. 		int z=sc.nextInt();
  19.  
  20. 		int arr1[]=new int[n];
  21. 		int arr2[]=new int[z];
  22.  
  23. 		for(int i=0;i<n;i++)
  24. 		arr1[i]=sc.nextInt();
  25.  
  26. 		for(int i=0;i<z;i++)
  27. 		arr2[i]=sc.nextInt();
  28.  
  29. 		Map<Integer,Integer> m=new HashMap<>();
  30.  
  31. 		for(int ele:arr1)
  32. 		m.put(ele,m.getOrDefault(ele,0)+1);
  33.  
  34. 		boolean flag=true;
  35.  
  36. 		for(int ele:arr2)
  37. 		{
  38. 			if(!m.containsKey(ele))
  39. 			{
  40. 				flag=false;
  41. 				break;
  42. 			}
  43.  
  44. 			if(m.containsKey(ele))
  45. 			{
  46. 				int freq=m.get(ele)-1;
  47. 				if(freq<=0)
  48. 				m.remove(ele);
  49. 				else
  50. 				m.put(ele,freq);
  51. 			}
  52. 		}
  53.  
  54. 		if(flag)
  55. 		System.out.println("arr2 is subset of arr1");
  56.  
  57. 		else
  58. 		System.out.println("arr2 is not a subset of arr1");
  59. 	}
  60. }
Success #stdin #stdout 0.13s 56696KB
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2 4 7 1 5 5 
5 4 2
stdout
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arr2 is subset of arr1
https://ideone.com/9mOTwu
language:
Java (HotSpot 12)
created:
4 days ago
visibility:
public

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