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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. #define ll long long
  5. const ll N=3e5;
  6. int main(){
  7.  
  8. 	ll t;
  9. 	cin>>t;
  10. 	while(t--){
  11. 	ll n,x,ans=0;
  12. 	cin>>n;
  13. 	ll A[N]={0};
  14. 	ll M[N]={0};
  15. 	for(ll i=0;i<n;i++){
  16. 		cin>>x;
  17. 		A[x]++;
  18. 	}
  19.  
  20. 	for(ll i=1;i<N;i++)
  21. 		M[i]=M[i-1]+A[i];
  22.  
  23. 	for(ll i=1;i<N;i++)
  24. 		for(ll j=i;j<N;j+=i){
  25. 			ans+=A[i]*(M[j-1]-M[j-i-1])*(j/i-1);
  26. 		}
  27. 	cout<<ans<<"\n";
  28. 	}
  29. }
  30.  
  31.  
  32.  
  33.  
Success #stdin #stdout 0.07s 8288KB
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stdout
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https://ideone.com/kBvJg4
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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