Editorial for DMOPC '19 Contest 7 P0 - Contest Feedback - Olympiads Online Judge

Editorial for DMOPC '19 Contest 7 P0 - Contest Feedback

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Author: Tzak

The average of $n$ $n$ numbers $a_1, \dots, a_n$ $a_{1}, \dots, a_{n}$ is given by $\frac 1 n \sum a_i$ $\frac{1}{n} \sum a_{i}$ . Knowing this, implement what is required in the problem statement, and pay special attention to print the result with an absolute error no greater than $10^{-6}$ $10^{- 6}$ .

In C/C++: printf("%.6f\n", ans)
In C++: std::cout << std::fixed << std::setprecision(6) << ans << "\n"
In Java: System.out.printf("%.6f\n", ans)
In Python: print(f'This converts to {ans:.2f}')

Pseudocode:

Copy

read A, B, C, D

print (A + B) / 2.0
print (A + C) / 2.0
print (A + D) / 2.0
print (B + C) / 2.0
print (B + D) / 2.0
print (C + D) / 2.0
print (A + B + C) / 3.0
print (A + B + D) / 3.0
print (A + C + D) / 3.0
print (B + C + D) / 3.0
print (A + B + C + D) / 4.0

Time complexity: $\mathcal{O}(1)$ $O (1)$

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