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  1. #include <iostream>
  2. #include <vector>
  3.  
  4. using namespace std;
  5.  
  6. int main() {
  7.  
  8. 	ios_base::sync_with_stdio(0);
  9. 	cin.tie(0);
  10.  
  11. 	int c;
  12. 	cin >> c;
  13.  
  14. 	while(c--){
  15. 		int n, d;
  16. 		cin >> d >> n;
  17. 		vector<long long> cnt(d);
  18. 		int sum = 0;
  19. 		long long answer = 0;
  20. 		for(int i = 0; i < n; i++){
  21. 			int x;
  22. 			cin >> x;
  23. 			sum = (sum + x) % d;
  24. 			answer += cnt[sum]++;
  25. 		}
  26. 		answer += cnt[0];
  27. 		cout << answer << "\n";
  28. 	}
  29.  
  30. 	return 0;
  31. }
Success #stdin #stdout 0.01s 5388KB
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stdin
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2
7 3
1 2 3
4 8
2 1 2 1 1 2 1 2
stdout
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0
6
https://ideone.com/zvIrTX
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
public

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