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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. 	int left = 0, right = n-1;
  9. 	int index = -1;
  10. 	while(left<=right){
  11. 		int mid = (left+right)/2;
  12. 		if(A[mid]==x){
  13. 			index = mid;
  14. 			right = mid-1;
  15. 		}
  16. 		if(A[mid]<x){
  17. 			left = mid+1;
  18. 		}
  19. 		if(x<A[mid]){
  20. 			right = mid-1;
  21. 		}
  22. 	}
  23. 	cout<<index<<endl;
  24. 	return 0;
  25. }
Success #stdin #stdout 0.01s 5324KB
comments (?)
stdin
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7 3
1 2 3 3 4 5 5
stdout
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-1
https://ideone.com/HaBjrZ
language:
C++14 (gcc 8.3)
created:
7 days ago
visibility:
public

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