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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. int main() {
  4. 	long double ret = 0.0, mul = 1.0;
  5. 	for(int i = 1; i <= 50; i++) mul *= 2.0, ret += 1.0 * i * i / mul;
  6. 	cout << fixed << setprecision(15) << ret << endl;
  7. 	return 0;
  8. }
Success #stdin #stdout 0s 15240KB
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stdin
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Standard input is empty
stdout
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5.999999999997597
https://ideone.com/tZqGTx
language:
C++14 (gcc 8.3)
created:
6 years ago
visibility:
public

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