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1 | import java.util.Scanner; | |
2 | ||
3 | public class SimpleCalc { | |
4 | ||
5 | public static void main(String[] args) { | |
6 | Scanner in = new Scanner(System.in); | |
7 | ||
8 | while (in.hasNext()) { | |
9 | int n = in.nextInt(); | |
10 | ||
11 | boolean cp = false; | |
12 | for (int i = 0; i < n; i++) { | |
13 | - | System.out.println(); |
13 | + | if (cp == true) |
14 | System.out.println(); | |
15 | cp = true; | |
16 | int x = in.nextInt(); | |
17 | double a0 = in.nextDouble(); | |
18 | double af = in.nextDouble(); | |
19 | ||
20 | double a1 = 0; | |
21 | ||
22 | double c = 0; | |
23 | double k = 0; | |
24 | for (int j = 0; j < x; j++) { | |
25 | c = in.nextDouble(); | |
26 | c = (double) (-1) | |
27 | * ((double) 2 * (double) (x - j) * (double) c ); | |
28 | ||
29 | k = (double) c + (double) k; | |
30 | ||
31 | } | |
32 | k=(double)k/(double)(x+1); | |
33 | a1 = ((double) (x * a0) + af) / (double) (x + 1) + (double) k; | |
34 | System.out.printf("%.2f\n", a1); | |
35 | ||
36 | } | |
37 | ||
38 | } | |
39 | } | |
40 | } |