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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	vector<int>a= {5,9,10,10,10,10,11,11,12};
  6. 	// auto it= lower_bound(v.begin(),v.end(),11);
  7. 	// int idx = it-v.begin();
  8. 	// implementing lower_bound:
  9. 	int l=0, h=a.size()-1;
  10. 	int k=11;
  11. 	while(l<h){
  12. 		int m=(l+h)/2;
  13. 		if(a[m]<k)
  14. 		l=m+1;
  15. 		else{
  16. 			if(a[m]==k)
  17. 			h=m;
  18. 			h=m;
  19. 		}
  20. 	}
  21. 	cout<<" idx is "<<h<<endl;
  22. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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Standard input is empty
stdout
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 idx is 6
https://ideone.com/yTkRqn
language:
C++ (gcc 8.3)
created:
10 days ago
visibility:
public

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