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  1. #include <iostream>
  2. #include <map>
  3. using namespace std;
  4.  
  5. int main() {
  6.  
  7. 	long long n;
  8. 	cin>>n;
  9.  
  10. 	long long a[n];
  11. 	for(long long i=0;i<n;i++)
  12. 	{
  13. 		cin>>a[i];
  14. 	}
  15.  
  16. 	long long sum=0;
  17. 	long long count1=0;
  18. 	map<long long,long long> Map;
  19. 	Map[0]=1;
  20. 	for(long long i=0;i<n;i++)
  21. 	{
  22. 		sum=((sum+a[i])%n+n)%n;
  23. 		if(Map.count(sum) > 0)
  24. 		{
  25. 			count1+=Map[sum];
  26. 		}
  27. 		if(Map.count(sum) <= 0)
  28. 		{
  29. 			Map[sum]=1;
  30. 		}
  31. 		else
  32. 		{
  33. 			Map[sum]++;
  34. 		}
  35. 	}
  36.  
  37. 	cout<<count1<<endl;
  38.  
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 5272KB
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stdin
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100
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
stdout
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https://ideone.com/vEHxP8
language:
C++14 (gcc 8.3)
created:
8 days ago
visibility:
public

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