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  1. #include <iostream>
  2.  
  3. using namespace std;
  4.  
  5. int n, k, a[100005];
  6.  
  7. int main(){
  8. 	cin >> n >> k;
  9. 	for (int i = 1; i <= n; i++){
  10. 		cin >> a[i];
  11. 	}
  12. 	int t = a[n];
  13. 	int z = 0;
  14. 	for (int i = n-1; i >= 1; i--){
  15. 		if (a[i]!=t){
  16. 			z = i;
  17. 			//cout << t << endl;
  18. 			break;
  19. 		}
  20. 	}
  21. 	if (k>z) cout << z;
  22. 	else cout << -1;
  23. 	return 0;
  24. }
Success #stdin #stdout 0s 15624KB
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https://ideone.com/8zxuet
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
public

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