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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	vector<int>arr = {1,1,1,1,2,2,3,3,3,3,6,6,6,6};
  6. 	int n = arr.size();
  7. 	int k = 4;
  8.  
  9. 	int s = 0;
  10. 	int e = n-1;
  11. 	while(s<=e){
  12. 		int mid = s + (e - s)/2;
  13. 		int x = arr[mid];
  14. 		int firstOcc = lower_bound(arr.begin(),arr.end(),x) - arr.begin();
  15. 		int lastOcc = upper_bound(arr.begin(),arr.end(),x) - arr.begin() - 1;
  16. 		int len = lastOcc - firstOcc + 1;
  17. 		if(len!=k){
  18. 			cout<<x;
  19. 			return 0;
  20. 		}
  21. 		else{
  22. 			if((lastOcc - s + 1) % k == 0){ // answer in right half
  23. 				s = lastOcc+1;
  24. 			}
  25. 			else{
  26. 				e = firstOcc-1;
  27. 			}
  28. 		}
  29. 	}
  30. 	return 0;
  31. }
Success #stdin #stdout 0s 5284KB
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https://ideone.com/yUF0My
language:
C++ (gcc 8.3)
created:
8 days ago
visibility:
public

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