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  1.  
  2. import java.util.*;
  3. public class Main {
  4.     public static double findArea(int[] x, int[] y) {
  5.         int a, b, n = x.length;
  6.         int total = 0;
  7.         for (a = 0; a < n - 1; a++) {
  8.             total += (x[a + 1] + x[a]) * (y[a] - y[a + 1]);
  9.         }
  10.         total += (x[0] + x[n - 1]) * (y[n - 1] - y[0]);
  11.         if (total < 0) total = -total;
  12.         return 0.5 * total;
  13.     }
  14.     public final static void main(String[] args) {
  15.         try {
  16.             Scanner s = new Scanner(System.in);
  17.             int n = s.nextInt();
  18.             int x[] = new int[n];
  19.             int y[] = new int[n];
  20.             for (int i = 0; i < n; i++) {
  21.                 x[i] = s.nextInt();
  22.             }
  23.             for (int i = 0; i < n; i++) {
  24.                 y[i] = s.nextInt();
  25.             }
  26.             System.out.println(findArea(x, y));
  27.         } catch (Exception e) {
  28.             System.out.println(e);
  29.             e.printStackTrace(System.out);
  30.         }
  31.     }
  32.     private static void validateExample(String exampleNum, double returned, double expected, String methodInvocation) {
  33.         print(exampleNum);
  34.         print(" ");
  35.         if (!eq(returned, expected)) {
  36.             print("FAIL");
  37.         } else {
  38.             print("SUCCESS");
  39.         }
  40.         print(" ");
  41.         print(methodInvocation);
  42.         print("\tGot:[");
  43.         print(returned);
  44.         print("]\t");
  45.         print("Expected:[");
  46.         print(expected);
  47.         print("]");
  48.         print("\n");
  49.     }
  50.     public static void print(boolean a) {
  51.         System.out.print(a);
  52.     }
  53.     public static void print(long a) {
  54.         System.out.print(a);
  55.     }
  56.     public static void print(int a) {
  57.         System.out.print(a);
  58.     }
  59.     public static void print(char a) {
  60.         System.out.print(a);
  61.     }
  62.     public static void print(String a) {
  63.         System.out.print(a);
  64.     }
  65.     public static void print(int[] a) {
  66.         if (a == null) {
  67.             System.out.print("null");
  68.             return;
  69.         }
  70.         for (int i = 0; i < a.length; i++) System.out.print(a[i] + (i < a.length - 1 ? "," : ""));
  71.     }
  72.     public static void print(int[][] a) {
  73.         if (a == null) {
  74.             System.out.print("null");
  75.             return;
  76.         }
  77.         for (int i = 0; i < a.length; i++) {
  78.             print(a[i]);
  79.             print("\n");
  80.         }
  81.     }
  82.     public static void print(String[] a) {
  83.         if (a == null) {
  84.             System.out.print("null");
  85.             return;
  86.         }
  87.         for (int i = 0; i < a.length; i++) System.out.print(a[i] + (i < a.length - 1 ? "," : ""));
  88.     }
  89.     public static boolean eq(boolean a, boolean b) {
  90.         return a == b;
  91.     }
  92.     public static boolean eq(long a, long b) {
  93.         return a == b;
  94.     }
  95.     public static boolean eq(int a, int b) {
  96.         return a == b;
  97.     }
  98.     public static boolean eq(char a, char b) {
  99.         return a == b;
  100.     }
  101.     public static boolean eq(String a, String b) {
  102.         return a.equals(b);
  103.     }
  104.     public static boolean eq(int[] a, int[] b) {
  105.         return Arrays.equals(a, b);
  106.     }
  107.     public static boolean eq(String[] a, String[] b) {
  108.         return Arrays.equals(a, b);
  109.     }
  110.     public static void print(double a) {
  111.         System.out.print(a);
  112.     }
  113.     public static boolean eq(double a, double b) {
  114.         return Math.abs(a - b) < 1e15;
  115.     }
  116. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
spoj: The program compiled successfully, but main class was not found.
      Main class should contain method: public static void main (String[] args).
stdout
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Standard output is empty
https://ideone.com/IIOiJI
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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