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  1. #include<iostream>
  2. using namespace std;
  3. int main(){
  4.  
  5. 	// find fist and last position in an array.
  6. 	int arr[6]={5,7,7,8,8,10};
  7. 	cout<<"Enter the targeted value\n";
  8. 	int target;
  9. 	cin>>target;
  10. 	int start=0,end=5;
  11. 	int last=-1,first=-1;
  12. 	while(start<=end){
  13. 		int mid=start+(end-start)/2;
  14. 		if(arr[mid]==target){
  15. 			first=mid;
  16. 			end=mid-1;
  17. 		}else if(arr[mid]<target){
  18. 			start=mid+1;
  19. 		}else{
  20. 			end=mid-1;
  21. 		}
  22. 	}
  23.  
  24. 	start=0,end=5;
  25. 		while(start<=end){
  26. 				int mid=start+(end-start)/2;
  27. 		if(arr[mid]==target){
  28. 			last=mid;
  29. 			start=mid+1;
  30. 		}else if(arr[mid]<target){
  31. 			start=mid+1;
  32. 		}else{
  33. 			end=mid-1;
  34. 		}
  35. 	}
  36.  
  37. 	cout<<first <<" "<< last;
  38. 	return 0;
  39. }
Success #stdin #stdout 0.01s 5316KB
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Enter the targeted value
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https://ideone.com/8X0Z9B
language:
C++ (gcc 8.3)
created:
3 hours ago
visibility:
public

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