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| 1 | import java.util.Scanner; | |
| 2 | ||
| 3 | public class SimpleCalc {
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| 4 | ||
| 5 | public static void main(String[] args) {
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| 6 | Scanner in = new Scanner(System.in); | |
| 7 | ||
| 8 | while (in.hasNext()) {
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| 9 | int n = in.nextInt(); | |
| 10 | ||
| 11 | boolean cp = false; | |
| 12 | for (int i = 0; i < n; i++) {
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| 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++) {
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| 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);
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| 35 | ||
| 36 | } | |
| 37 | ||
| 38 | } | |
| 39 | } | |
| 40 | } |
