No.347 Differentiation and Integration
タグ : / 解いたユーザー数 222
作問者 :
小指が強い人
Problem Statement
The following function $f(x)$ is given.
$f(x)=x^{a_1}+x^{a_2}+\dots+x^{a_{N-1}}+x^{a_N}$
Given a constant $B$, find the value $f'(B)$ of the derivative of the expression with respect to $x$, and,
writing the indefinite integral of the expression as $F(x)+C={\int}f(x)dx$, the value of $F(B)$.
(Here, $C$ is the constant part, including the constant of integration.)
However, the indefinite integral F in this problem is a function that satisfies $F'=f$ and can be expressed as a linear combination of $\log(x)$ and $x^r(r \ne 0)$.
Note
High school mathematics knowledge is required.
Input
The first line gives the number of $a_i$.
The second line gives the constant $B$.
The third line gives the values of $a_i$.
$N$
$B$
$a_1\ a_2\dots a_{N-1}\ a_N$
$1 \le N \le 10$ (integer)
$1 \le B \le 10$ (integer)
$-5.0 \le a_i \le 5.0$ (real number with one digit after the decimal point)
$(i=1\dots N)$
Output
$X_1$ $X_2$
Output $f'(B)$ as $X_1$ and $F(B)$ as $X_2$.
The inputs are prepared so that the absolute values are neither too large nor too small, so simply output them as they are without hesitation.
A relative error of up to $10^{-4}$ is allowed.
Print a newline at the end.
Sample
Sample 1
Input
4 2 1.0 2.0 3.0 4.0
Output
49.0 15.066666666666666
The original function is $f(x)=x^1+x^2+x^3+x^4$, so
the derivative is $f'(2)=2^0+2×2^1+3×2^2+4×2^3=49.0$
and the integral is $F(2)=1/2×2^2+1/3×2^3+1/4×2^4+1/5×2^5=15.0666...$
Sample 2
Input
10 10 -5.0 2.2 4.6 5.0 -1.0 2.0 0.5 0.3 -3.9 1.5
Output
68372.74882983962 238751.0685480203
Sample 3
Input
2 2 0.0 -1.0
Output
-0.25 2.6931471805599454
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