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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. /* Name of the class has to be "Main" only if the class is public. */
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{
  10. 		// your code goes here
  11. 		int[] arr={1,2,2,7,8,8,8,8,9,10};
  12. 		int k=8;
  13. 		System.out.print(first(arr,k)+" "+last(arr,k));
  14. 	}
  15. 	public static int first(int[] arr,int k){
  16. 		int i=0;
  17. 		int j=arr.length-1;
  18. 		int ans=-1;
  19. 		while(i<=j){
  20. 			int mid=(i+j)/2;
  21. 			if(arr[mid]==k){
  22. 				ans=mid;
  23. 				j=mid-1;
  24. 			}
  25. 			else if(arr[mid]>k){
  26. 				j=mid-1;
  27. 			}
  28. 			else{
  29. 				i=mid+1;
  30. 			}
  31. 		}
  32. 		return ans;
  33.  
  34. 	}
  35.  
  36. 	public static int last(int[] arr,int k){
  37. 		int i=0;
  38. 		int j=arr.length-1;
  39. 		int ans=-1;
  40. 		while(i<=j){
  41. 			int mid=(i+j)/2;
  42. 			if(arr[mid]==k){
  43. 				ans=mid;
  44. 				i=mid+1;
  45. 			}
  46. 			else if(arr[mid]>k){
  47. 				j=mid-1;
  48. 			}
  49. 			else{
  50. 				i=mid+1;
  51. 			}
  52. 		}
  53. 		return ans;
  54.  
  55. 	}
  56. }
Success #stdin #stdout 0.11s 55448KB
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4 7
https://ideone.com/9udPYJ
language:
Java (HotSpot 12)
created:
13 days ago
visibility:
public

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