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  1. #include <iostream>
  2. #include <climits>
  3. using namespace std;
  4. int main() {
  5. 	long n;
  6. 	cin>>n;
  7. 	long *a,m=LONG_MIN;
  8. 	a=new long [n];
  9. 	for(long i=0;i<n;i++){
  10. 		cin>>a[i];
  11. 		m=max(m,a[i]);
  12. 	}
  13. 	long p=1,size=0;
  14. 	while(p<m){
  15. 		p=p*2;
  16. 		size++;
  17. 	}
  18. 	p=p/2;
  19. 	long t=p;
  20. 	long *c=new long [size+1];
  21. 	for(long i=size-1;i>=0;i--){
  22. 		long count=0;
  23. 		for(long j=0;j<n;j++){
  24. 			if(a[j]/t==1){
  25. 				count++;
  26. 			}
  27. 			a[j]=a[j]%t;
  28. 		}
  29. 		c[i]=count*(count-1)/2;
  30. 		t=t/2;
  31. 	}
  32. 	c[size]=0;
  33. 	t=1;
  34. 	long sum=0;
  35. 	for(long i=0;i<size;i++){
  36. 		sum=sum+c[i]%2*t;
  37. 		t=t*2;
  38. 		c[i+1]=c[i+1]+c[i]/2;
  39. 	}
  40. 	while(c[size]!=0){
  41. 		sum=sum+c[size]%2*t;
  42. 		t=t*2;
  43. 		c[size]=c[size]/2;
  44. 	}
  45. 	cout<<sum<<endl;
  46. 	return 0;
  47. }
Success #stdin #stdout 0s 3476KB
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https://ideone.com/pWIIIW
AND
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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