Language: C++

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UncheckedIOException;
import java.util.StringTokenizer;

class Main{
	public static void main(String[] args) {
		SC sc=new SC(System.in);
		int N=sc.nextInt();
		int syurui=(N+1)/2;
		int[] kosu=new int[syurui];
		if(N%2==0) {
			for(int i=0; i<N; i++) {
				kosu[sc.nextInt()/2]++;
			}
		}

		else if(N%2==1) {
			for(int i=0; i<N; i++) {
				kosu[(sc.nextInt()-1)/2]++;
			}
		}

		for(int i=0; i<(N+1)/2; i++) {
			if(N%2==0) {
				if(kosu[i]!=2) {
					System.out.println("0");
					System.exit(0);
				}
			}
			else {
				if(i>0) {
					if(kosu[i]!=2) {
						System.out.println("0");
						System.exit(0);
					}
				}
			}
		}
		long a=1;
		for(int i=0; i<N/2; i++) {
			a*=2;
			a%=1000000007;
		}
		System.out.println(a);

	}
	static class SC {

		private BufferedReader reader = null;

		private StringTokenizer tokenizer = null;
		public SC(InputStream in) {
			reader = new BufferedReader(new InputStreamReader(in));
		}
		public String next() {
			if (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new UncheckedIOException(e);
				}
			}
			return tokenizer.nextToken();
		}
		public int nextInt() {
			return Integer.parseInt(next());
		}
		public long nextLong() {
			return Long.parseLong(next());
		}
	}
}

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.io.BufferedReader;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:2:1: error: 'import' does not name a type
    2 | import java.io.IOException;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: 'import' does not name a type
    3 | import java.io.InputStream;
      | ^~~~~~
a.cc:3:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:4:1: error: 'import' does not name a type
    4 | import java.io.InputStreamReader;
      | ^~~~~~
a.cc:4:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:5:1: error: 'import' does not name a type
    5 | import java.io.UncheckedIOException;
      | ^~~~~~
a.cc:5:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:6:1: error: 'import' does not name a type
    6 | import java.util.StringTokenizer;
      | ^~~~~~
a.cc:6:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:9:15: error: expected ':' before 'static'
    9 |         public static void main(String[] args) {
      |               ^~~~~~~
      |               :
a.cc:9:33: error: 'String' has not been declared
    9 |         public static void main(String[] args) {
      |                                 ^~~~~~
a.cc:9:42: error: expected ',' or '...' before 'args'
    9 |         public static void main(String[] args) {
      |                                          ^~~~
a.cc:52:24: error: expected ':' before 'BufferedReader'
   52 |                 private BufferedReader reader = null;
      |                        ^~~~~~~~~~~~~~~
      |                        :
a.cc:52:25: error: 'BufferedReader' does not name a type
   52 |                 private BufferedReader reader = null;
      |                         ^~~~~~~~~~~~~~
a.cc:54:24: error: expected ':' before 'StringTokenizer'
   54 |                 private StringTokenizer tokenizer = null;
      |                        ^~~~~~~~~~~~~~~~
      |                        :
a.cc:54:25: error: 'StringTokenizer' does not name a type
   54 |                 private StringTokenizer tokenizer = null;
      |                         ^~~~~~~~~~~~~~~
a.cc:55:23: error: expected ':' before 'SC'
   55 |                 public SC(InputStream in) {
      |                       ^~~
      |                       :
a.cc:55:38: error: expected ')' before 'in'
   55 |                 public SC(InputStream in) {
      |                          ~           ^~~
      |                                      )
a.cc:58:23: error: expected ':' before 'String'
   58 |                 public String next() {
      |                       ^~~~~~~
      |                       :
a.cc:58:24: error: 'String' does not name a type
   58 |                 public String next() {
      |                        ^~~~~~
a.cc:68:23: error: expected ':' before 'int'
   68 |                 public int nextInt() {
      |                       ^~~~
      |                       :
a.cc:71:23: error: expected ':' before 'long'
   71 |                 public long nextLong() {
      |                       ^~~~~
      |                       :
a.cc:74:10: error: expected ';' after class definition
   74 |         }
      |          ^
      |          ;
a.cc:50:9: error: a storage class can only be specified for objects and functions
   50 |         static class SC {
      |         ^~~~~~
a.cc:75:2: error: expected ';' after class definition
   75 | }
      |  ^
      |  ;
a.cc: In static member function 'static void Main::main(int*)':
a.cc:10:30: error: 'System' was not declared in this scope
   10 |                 SC sc=new SC(System.in);
      |                              ^~~~~~
a.cc:13:20: error: structured binding declaration cannot have type 'int'
   13 |                 int[] kosu=new int[syurui];
      |                    ^~
a.cc:13:20: note: type must be cv-qualified 'auto' or reference to cv-qualified 'auto'
a.cc:13:20: error: empty structured binding declaration
a.cc:13:23: error: expected initializer before 'kosu'
   13 |                 int[] kosu=new int[syurui];
      |                       ^~~~
a.cc:16:33: error: 'kosu' was not declared in this scope
   16 |                                 kosu[sc.nextInt()/2]++;
      |                                 ^~~~
a.cc:22:33: error: 'kosu' was not declared in this scope
   22 |                                 kosu[(sc.nextInt()-1)/2]++;
      |                                 ^~~~
a.cc:28:36: error: 'kosu' was not declared in this scope
   28 |                                 if(kosu[i]!=2) {
      |                                    ^~~~
a.cc:35:44: error: 'kosu' was not declared in this scope
   35 |                                         if(kosu[i]!=2) {
      |                                            ^~~~
a.cc: In member function 'int Main::SC::nextInt()':
a.cc:69:32: error: 'Integer' was not declared in this scope
   69 |                         return Integer.parseInt(next());
      |                                ^~~~~~~
a.cc:69:49: error: 'next' was not declared in this scope; did you mean 'nextInt'?
   69 |                         return Integer.parseInt(next());
      |                                                 ^~~~
      |                                                 nextInt
a.cc: In member function 'long int Main::SC::nextLong()':
a.cc:72:32: error: 'Long' was not declared in this scope; did you mean 'long'?
   72 |                         return Long.parseLong(next());
      |                                ^~~~
      |                                long
a.cc:72:47: error: 'next' was not declared in this scope; did you mean 'nextInt'?
   72 |                         return Long.parseLong(next());
      |                                               ^~~~
      |                                               nextInt