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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 Main
  9. {
  10. 	public static int find_first(int[] arr, int n, int tg){
  11. 		int l=0;
  12. 		int r = n-1;
  13. 		int ans1 = -1;
  14. 		while(l<=r){
  15. 			int m = l + (r-l)/2;
  16. 			if(arr[m] == tg){
  17. 				ans1 = m;
  18. 				r=m-1;
  19. 			}
  20. 			else if(arr[m] > tg){
  21. 				r = m-1;
  22. 			}
  23. 			else{
  24. 				l = m+1;
  25. 			}
  26. 		}
  27. 		return ans1;
  28. 	}
  29.  
  30. 	public static int find_last(int[] arr, int n, int tg){
  31. 		int l=0;
  32. 		int r = n-1; 
  33. 		int ans2 = -1;
  34. 		while(l<=r){
  35. 			int m = l + (r-l)/2;
  36. 			if(arr[m] == tg){
  37. 				ans2 = m;
  38. 				l=m+1;
  39. 			}
  40. 			else if(arr[m] > tg){
  41. 				r = m-1;
  42. 			}
  43. 			else{
  44. 				l = m+1;
  45. 			}
  46. 		}
  47. 		return ans2;
  48. 	}
  49. 	public static void main (String[] args) throws java.lang.Exception
  50. 	{
  51. 		// your code goes here
  52. 		Scanner sc = new Scanner(System.in);
  53. 		int n = sc.nextInt();
  54. 		int[] arr = new int[n];
  55. 		for(int i=0;i<n;i++){
  56. 			arr[i] = sc.nextInt();
  57. 		}
  58. 		int tg = sc.nextInt();
  59. 		int ans1 = find_first(arr,n,tg);
  60. 		int ans2 = find_last(arr,n,tg);
  61. 		System.out.println(ans1 + " " + ans2);
  62.  
  63. 	}
  64. }
Success #stdin #stdout 0.22s 60824KB
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https://ideone.com/KyLJgk
First and Last Occurence of element
language:
Java (HotSpot 12)
created:
4 days ago
visibility:
public

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