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  1. #include<iostream>
  2. #include<bits/stdc++.h>
  3. using namespace std;
  4. #define ll long long
  5. long long a[1000000];
  6. long long freq[1000000];
  7. int main() {
  8. 	int queries;
  9. 	cin>>queries;
  10. 	while(queries--)
  11. 	{long long int n;
  12. 	cin>>n;
  13. 	ll t;
  14. 	ll ans=0;
  15. 	ll sum=0;
  16. 	memset(freq,0,sizeof(freq));
  17. 	freq[0]=1;
  18. 	for(ll int i=0;i<n;i++)
  19. 	{cin>>a[i];
  20.      sum=sum+a[i];
  21. 	sum%=n;
  22. 	sum=((sum+n)%n);
  23. 	 freq[sum]++;
  24.     }
  25. 	for(ll int i=0;i<n /*and( freq[i]>=2)*/;i++)
  26. 	{ll int m=freq[i];
  27.     ans +=(m)*(m-1)/2;
  28. 	}
  29. 	cout<<ans<<endl;
  30. 	}
  31. 	return 0;
  32. }
Success #stdin #stdout 0s 4768KB
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stdout 
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https://ideone.com/jyGIiv
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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