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  1. #include<bits/stdc++.h>
  2. #define ll  int
  3. #define pb push_back
  4. using namespace std;
  5. ll i,j,n;
  6. ll s[1000001];
  7. ll b[1000001];
  8. ll m[1000001];
  9. void seive()
  10. {
  11. 	for(ll i=2;i<=1000000;i++)
  12. 	{
  13. 		if(s[i]==0)
  14. 		{
  15. 			for(ll j=i;j<=1000000;j+=i)
  16. 			{
  17. 				s[j]+=i;
  18. 			}
  19. 		}
  20. 	}
  21. }
  22. int main()
  23. {
  24.  
  25.     ios_base::sync_with_stdio(0);
  26.     cin.tie(0);
  27. 	seive();
  28. 	ll t;
  29. 	cin>>t;
  30. 	while(t--)
  31. 	{
  32. 		cin>>n;
  33. 		int cnt=0;
  34. 		for(i=0;i<n;i++)
  35. 		{
  36. 			ll x;
  37. 			cin>>x;
  38. 			m[x]++;
  39. 			if(m[x]==1)
  40. 				b[cnt++]=x;
  41. 		}
  42. 		long long int ans=0;
  43. 		for(i=0;i<cnt;i++)
  44. 		{
  45. 			ll ele=b[i];
  46. 			ans+=(m[ele]*(m[ele]-1));
  47. 			for(j=2*ele;j<=1000000;j+=ele)
  48. 			{
  49. 				if(s[j]%s[ele]==0)
  50. 				{
  51. 					ans+=(m[ele]*m[j]);
  52. 				}
  53. 			}
  54. 		}
  55. 		for(i=0;i<cnt;i++)
  56. 			m[b[i]]=0;
  57. 		cout<<ans<<"\n";
  58. 	}
  59.   return 0;
  60.   }
  61.  
Runtime error #stdin #stdout 0.02s 6936KB
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https://ideone.com/XUhDs1
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
public

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