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  1. #include <iostream>
  2. #include <iomanip> 
  3. using namespace std;
  4.  
  5. int main() {
  6. 	int k;
  7. 	long double val = 0;
  8. 	cin >> k;
  9. 	for (int n = 1; n <= k; n++){
  10. 		val += 1.0/((3*n - 2)*(3*n + 1)); 
  11. 	}
  12. 	cout << setprecision(15) <<val;
  13. 	return 0;
  14. }
Success #stdin #stdout 0s 4508KB
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stdin
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10000
stdout
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0.33332222259258
https://ideone.com/MqLYRQ
Циклы
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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