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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() {
  5. 	int n;
  6. 	cin>>n;
  7.  
  8. 	vector<int> numbers(n);
  9.  
  10. 	for(int i=0; i<n; i++){
  11. 		cin>>numbers[i];
  12. 	}
  13.  
  14. 	int answer = 0;
  15.  
  16. 	for(int i=0; i<n; i++){
  17. 		for(int j=i+1; j<n; j++){
  18. 			if((numbers[i] + numbers[j])%5 == 0)answer++;
  19. 		}
  20. 	}
  21.  
  22. 	cout<<answer;
  23.  
  24. 	return 0;
  25. }
Success #stdin #stdout 0.01s 5288KB
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stdin
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6 
2 2 5 5 3 3
stdout
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5
https://ideone.com/17rHeV
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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