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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. int main() 
  5. {
  6. 	long long n, a[100005], s = 0; cin >> n;
  7. 	for(int i = 0; i < n; i++){
  8. 		cin >> a[i];
  9. 	}
  10. 	for(int i = 0; i < n; i++){
  11. 		for(int j = i + 1; j < n; j++){
  12. 			s += a[i] * a[j] / __gcd(a[i], a[j]);
  13. 		}
  14. 	}
  15. 	cout << s;
  16.  
  17.     return 0;
  18. }
  19.  
Success #stdin #stdout 0.01s 5320KB
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stdin
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5
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stdout
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247
https://ideone.com/Pjz5pw
language:
C++14 (clang 8.0)
created:
6 days ago
visibility:
public

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