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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n, x;
  6. 	cin>>n>>x;
  7. 	int A[n];
  8. 	for(int i = 0; i<n; i++){
  9. 		cin>>A[i];
  10. 	}
  11. 	int left = 0, right = n-1;
  12. 	int index = -1;
  13. 	while(left<=right){
  14. 		int mid = (left+right)/2;
  15. 		if(A[mid]==x){
  16. 			index = mid;
  17. 			right = mid-1;
  18. 		}
  19. 		if(A[mid]<x){
  20. 			left = mid+1;
  21. 		}
  22. 		if(x<A[mid]){
  23. 			right = mid-1;
  24. 		}
  25. 	}
  26. 	cout<<index<<endl;
  27. 	return 0;
  28. }
Success #stdin #stdout 0.01s 5320KB
comments (?)
stdin 
7 3
1 2 3 3 4 5 5
stdout 
2
https://ideone.com/bPscJW
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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