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  1. #include <cstdlib>
  2. #include <iostream>
  3.  
  4. using namespace std;
  5.  
  6. int main()
  7. {
  8. 	double e;
  9. 	cin >> e;
  10. 	double a = 1.0, b = 25.0;
  11. 	double r=0, y=0;
  12. 	do{
  13. 		r+=y;
  14. 		y=1.0/(a+b);
  15. 		a *= 4;
  16. 		b *= 5;
  17. 	}while( y>e );
  18. 	cout << r << endl;
  19. }
Success #stdin #stdout 0s 3476KB
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stdin
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0.0000004
stdout
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0.0481658
https://ideone.com/9nYtod
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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