fork download
copy 
  1. #include <iostream>
  2. #include <vector>
  3. #include <algorithm>
  4.  
  5. using namespace std;
  6.  
  7. vector<int> v; 
  8.  
  9. int main() {
  10. 	// your code goes here
  11. 	int n,m,k,a[100001];
  12. 	cin >> n >> k;
  13. 	for (int i=1;i<=n;i++) {
  14. 		cin >> m;
  15. 		v.push_back(m);
  16. 		a[m]=i;
  17. 	}
  18. 	sort(v.begin(),v.end());
  19. 	int i=0,j=n-1;
  20. 	while (i<=j)
  21. 	{
  22. 		int x=v[(j+i)/2]; 
  23. 		if (x==k) {
  24. 			cout << a[k];
  25. 			break;
  26. 		}
  27. 		else if (x>k) j=(j+i)/2;
  28. 		else i=(j+i)/2;
  29. 	}
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 4564KB
comments (?)
stdin
copy 
10 8
1 2 7 3 4 10 8 9 6 5
stdout
copy 
7
https://ideone.com/cWmPmY
language:
C++ (gcc 8.3)
created:
4 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!