criyle/codenet-compile-errors huggingface dataset:
Language: C++

#include <iostream>
#include <string>
#include <cstring>
#include <math.h>
#include <cmath>
#include <algorithm>

using namespace std;

int n[1000000];

int N;

long long pow(int n)
{
    long long base = 2, ans = 1;
    while (n)
    {
        if (n & 1)
        {
            ans *= base;
        }
        base *= base;
        n = n >> 1;
    }
    return base;
}
int main()
{
    cin >> N;
    for (int i = 0; i < N; i++)
        cin >> n[i];
    sort(n, n + N);
    if (N % 2 == 1)
    {
        bool f = 1;
        int p = 2;
        if (n[0] != 0)
            f = 0;
        for (int i = 1; i <= N - 2; i += 2)
        {
            if (n[i] != p || n[i + 1] != p)
            {
                f = 0;
                break;
            }
            p += 2;
        }
        if (f)
        {
            cout << pow((N - 1) / 2)%10E9+7 << endl;
        }
        else
            cout << '0' << endl;
    }
    else
    {
        bool f = 1;
        int p = 1;
        for (int i = 0; i <= N - 2; i += 2)
        {
            if (n[i] != p || n[i + 1] != p)
            {
                f = 0;
                break;
            }
            p += 2;
        }
        if (f)
        {
            cout << pow(N / 2)%10E9+7 << endl;
        }
        else
            cout << '0' << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:51:37: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   51 |             cout << pow((N - 1) / 2)%10E9+7 << endl;
      |                     ~~~~~~~~~~~~~~~~^~~~~
      |                        |             |
      |                        long long int double
a.cc:71:31: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   71 |             cout << pow(N / 2)%10E9+7 << endl;
      |                     ~~~~~~~~~~^~~~~
      |                        |       |
      |                        |       double
      |                        long long int
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
 
	ll MOD = 1e9 + 7;
	int n;
	cin >> n;
	int a[n];
	map<int, int> m;
	REP(i, n){
		cin >> a[i];
		m[a[i]]++;
	}
 
	bool flag = 0;
 
	if (n % 2){
		for (auto x : m){
			if (x.first == 0){
				if (x.second != 1) flag = 1;
			}
			else if (x.second != 2) flag = 1;
		}
	}
	else {
		for (auto x : m){
			if (x.second != 2) flag = 1;
		}
	}
 
	if (flag) cout << 0 << endl;
	else {
		ll ans = 1;
		for (int i = 0; i < n/2; i++){
			ans *= 2;
			ans %= MOD;
		}
 
		cout << ans << endl;
	}
 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'll' was not declared in this scope
    7 |         ll MOD = 1e9 + 7;
      |         ^~
a.cc:12:13: error: 'i' was not declared in this scope
   12 |         REP(i, n){
      |             ^
a.cc:12:9: error: 'REP' was not declared in this scope
   12 |         REP(i, n){
      |         ^~~
a.cc:35:19: error: expected ';' before 'ans'
   35 |                 ll ans = 1;
      |                   ^~~~
      |                   ;
a.cc:37:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   37 |                         ans *= 2;
      |                         ^~~
      |                         abs
a.cc:38:32: error: 'MOD' was not declared in this scope
   38 |                         ans %= MOD;
      |                                ^~~
a.cc:41:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   41 |                 cout << ans << endl;
      |                         ^~~
      |                         abs
Language: C++

#include <iostream>
#include <map>

using namespace std;

bool check(map<int, int> reportsMap, int noses) {
   int maxReport = noses - 1;
   if (noses % 2 == 0) {
      for (int i = 1; i <= maxReport; i+=2) {
         if (reportsMap[i] != 2) { return false; }
      }

   } else {
      if (reportsMap[0] != 1) { return false; }
      for (int i = 2; i <= maxReport; i+=2) {
         if (reportsMap[i] != 2) { return false; }
      }
   }
   return true;
}

int main() {

   int noses;
   cin >> noses;

   map<int, int> reportsMap;
   for (int i = 0; i < noses; i++) {
      int report;
      cin >> report;
      if (reportsMap.count(report)) {
         reportsMap[report] += 1;
      } else {
         reportsMap[report] = 1;
      }
   }

　  long long answer = 1;
　  for (int j = 0; j < (noses / 2); j++) {
　     answer = answer * 2 % 1000000007;
　  }

　　　if (check(reportsMap, noses) == false) {
      answer = 0;
   }

   cout << answer << endl;
}

Compiler output:
a.cc:38:1: error: extended character 　 is not valid in an identifier
   38 | 　  long long answer = 1;
      | ^
a.cc:39:1: error: extended character 　 is not valid in an identifier
   39 | 　  for (int j = 0; j < (noses / 2); j++) {
      | ^
a.cc:40:1: error: extended character 　 is not valid in an identifier
   40 | 　     answer = answer * 2 % 1000000007;
      | ^
a.cc:41:1: error: extended character 　 is not valid in an identifier
   41 | 　  }
      | ^
a.cc:43:1: error: extended character 　 is not valid in an identifier
   43 | 　　　if (check(reportsMap, noses) == false) {
      | ^
a.cc:43:1: error: extended character 　 is not valid in an identifier
a.cc:43:1: error: extended character 　 is not valid in an identifier
a.cc: In function 'int main()':
a.cc:38:1: error: '\U00003000' was not declared in this scope
   38 | 　  long long answer = 1;
      | ^~
a.cc:39:3: error: expected ';' before 'for'
   39 | 　  for (int j = 0; j < (noses / 2); j++) {
      |   ^ ~~~
      |   ;
a.cc:39:21: error: 'j' was not declared in this scope
   39 | 　  for (int j = 0; j < (noses / 2); j++) {
      |                     ^
a.cc:43:1: error: '\U00003000\U00003000\U00003000if' was not declared in this scope
   43 | 　　　if (check(reportsMap, noses) == false) {
      | ^~~~~~~~
a.cc:47:12: error: 'answer' was not declared in this scope
   47 |    cout << answer << endl;
      |            ^~~~~~
Language: C++

#include <algorithm>
#include <cmath>
#include <iostream>

using namespace std;

int main() {
  int N, A[100000];

  cin >> N;
  for (int i = 0; i < N; ++i) {
    cin >> A[i];
  }

  sort(A, A + N);

  if (N % 2 == 0) {
    for (int i = 0; i < N - 3; i += 2) {
      if (!(A[i] == A[i + 1] && A[i] + 2 == A[i + 2] &&
            A[i + 1] + 2 == A[i + 3])) {
        cout << 0 << endl;
        return 0;
      }
    }
  } else {
    if (A[0] != 0) {
      cout << 0 << endl;
      return 0;
    }
    for (int i = 1; i < N - 3; i += 2) {
      if (!(A[i] == A[i + 1] && A[i] + 2 == A[i + 2] &&
            A[i + 1] + 2 == A[i + 3])) {
        cout << 0 << endl;
        return 0;
      }
    }
  }

  cout << (N % 2 == 0 ? ((int)pow(2, N / 2) % 1000000007)
                      : ((int)pow(2, (N - 1) / 2)) % 1000000007)
       << endl;

  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:43:12: error: expected '}' at end of input
   43 |   return 0;
      |            ^
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
Language: C++

#include<bits/stdc++.h>
#define mins(a,b) a=min(a,b)
#define maxs(a,b) a=max(a,b)
using namespace std;
int main(){
  int n;
  cin>>n;
  int ans=1;
  int t[100010];
  int a[100010];
  for(int i=0;i<100010;i++){
    t[i]=0;
    a[i]=0;
  }
  for(int i=0;i<n;i++){
    cin>>t[i];
    a[t[i]]++;
  }
  for(int i=0;i<n;i++){
    if(a[i]==2)
      ans=(2*ans)%1000000007;
    if(n%2==0){
      if(i==0 and a[i]>1)
      ans=0;
      if(a>=1 and i%2==0)
      ans=0;
    }
    if(n%2==1){
      if(a[i]<2 or a[i]>2)
      ans=0;
      if(a>=1 and i%2==1)
      ans=0;
    }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:11: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   25 |       if(a>=1 and i%2==0)
      |          ~^~~
a.cc:31:11: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   31 |       if(a>=1 and i%2==1)
      |          ~^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main(){
  long int n;
  cin >> n;
  long long int a[n];
  for(int i=0;i<n;i++)cin >>a[i];
  sort(a,a+n);
  if (n%2==0){
    if(a[0]!=1 || a[1]!=1)cout << 0 <<endl;
    else cout << pow(2,n/2)%1000000007<<endl;
  }
  else{
    if(a[0]!=0)cout << 0 <<endl;
    else cout << pow(2,(n-1)/2)%1000000007<<endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:28: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   12 |     else cout << pow(2,n/2)%1000000007<<endl;
      |                  ~~~~~~~~~~^~~~~~~~~~~
      |                     |       |
      |                     |       int
      |                     __gnu_cxx::__promote<double>::__type {aka double}
a.cc:16:32: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   16 |     else cout << pow(2,(n-1)/2)%1000000007<<endl;
      |                  ~~~~~~~~~~~~~~^~~~~~~~~~~
      |                     |           |
      |                     |           int
      |                     __gnu_cxx::__promote<double>::__type {aka double}
Language: Java

import java.util.Arrays;

public class Main {
    private static java.util.Scanner scanner = new java.util.Scanner(System.in);

    public static void main(String[] args) {
        int n = scanner.nextInt(), a[] = new int[(n + 1) / 2], max = 0;
        for (int i = 0, temp; i < n; i++) {
            if (((temp = scanner.nextInt()) & 1) == (n & 1)) {
                System.out.println(0);
                return;
            }
            a[(temp - (~n & 1)) / 2]++;
            max = Math.max(max, temp);
        }

        long ans = 1;
        if ((n & 1) == 1)
            a = Arrays.copyOfRange(a, 1, a.length);
        for (int i = 0; i < a.length; i++) {
            if (a[i] != 2) {
                System.out.println(0);
                return;
            }
            ans = ans * 2 % 1000000007;
        }

        Util.println(max, Arrays.toString(a), ans);
    }
}

Compiler output:
Main.java:28: error: cannot find symbol
        Util.println(max, Arrays.toString(a), ans);
        ^
  symbol:   variable Util
  location: class Main
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;

const int mod = 1e9+7;
int a[1e5];

int solve(long long n){
  int ans=1;
  sort( a, a+n );

  if( (a[0] && n%2) || (a[0]==n%2 && n%2==0) ){
    return 0;
  }
  
  if( a[0]==0 ){
    a = a+1;
    n--;
  }

  for( int i=0; i<n; i+=2 ){
    if( a[i]!=a[i+1] ) return 0;
    ans << 1;
    ans %= mod;
  }
    
  return ans;
}

int main(){
  int N;
  cin >> N;
  for( int i=0; i<N; i++ ){
    cin >> a[i];
  }

  cout << solve(N) << endl;

  return 0;
}


Compiler output:
a.cc:5:7: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
    5 | int a[1e5];
      |       ^~~
a.cc:5:7: error: could not convert '1.0e+5' from 'double' to 'long unsigned int'
    5 | int a[1e5];
      |       ^~~
      |       |
      |       double
a.cc:5:7: error: size of array 'a' has non-integral type 'double'
a.cc: In function 'int solve(long long int)':
a.cc:16:7: error: incompatible types in assignment of 'int*' to 'int [1]'
   16 |     a = a+1;
      |     ~~^~~~~
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
const long long mod = 1e9+7;
long long a[1e5];

long long solve(long long n){
  long long ans=1LL;
  sort( a, a+n );

  if( (a[0] && n%2) || (a[0]==n%2 && n%2==0) ){
    return 0LL;
  }
  
  if( a[0]==0 ){
    a = a+1;
    n--;
  }

  for( long long i=0LL; i<n; i+=2LL ){
    if( a[i]!=a[i+1] ) return 0;
    ans << 1;
    ans %= mod;
  }
    
  return ans;
}

int main(){
  long long N;
  cin >> N;
  for(long long i=0LL; i<N; i++){
    cin >> a[i];
  }

  cout << solve(N) << endl;

  return 0;
}
  


Compiler output:
a.cc:5:13: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
    5 | long long a[1e5];
      |             ^~~
a.cc:5:13: error: could not convert '1.0e+5' from 'double' to 'long unsigned int'
    5 | long long a[1e5];
      |             ^~~
      |             |
      |             double
a.cc:5:13: error: size of array 'a' has non-integral type 'double'
a.cc: In function 'long long int solve(long long int)':
a.cc:16:7: error: incompatible types in assignment of 'long long int*' to 'long long int [1]'
   16 |     a = a+1;
      |     ~~^~~~~
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
const long long mod = 1e9+7;
long long a[1e5]

long long solve(long long n){
  long long ans=1LL;
  sort( a, a+n );

  if( (a[0] && n%2) || (a[0]==n%2 && n%2==0) ){
    return 0LL;
  }
  
  if( a[0]==0 ){
    a = a+1;
    n--;
  }

  for( long long i=0LL; i<n; i+=2LL ){
    if( a[i]!=a[i+1] ) return 0;
    ans << 1;
    ans %= mod;
  }
    
  return ans;
}

int main(){
  long long N;
  cin >> N;
  for(long long i=0LL; i<N; i++){
    cin >> a[i];
  }

  cout << solve(N) << endl;

  return 0;
}
  


Compiler output:
a.cc:7:1: error: expected initializer before 'long'
    7 | long long solve(long long n){
      | ^~~~
a.cc: In function 'int main()':
a.cc:33:12: error: 'a' was not declared in this scope
   33 |     cin >> a[i];
      |            ^
a.cc:36:11: error: 'solve' was not declared in this scope
   36 |   cout << solve(N) << endl;
      |           ^~~~~
Language: C++

#include<iostream>
#include<algorythm>
using namespace std;
const long long mod = 1e9+7;
long long a[1e5]

long long solve(long long n){
  long long ans=1LL;
  sort( a, a+n );

  if( (a[0] && n%2) || (a[0]==n%2 && n%2==0) ){
    return 0LL;
  }
  
  if( a[0]==0 ){
    a = a+1;
    n--;
  }

  for( long long i=0LL; i<n; i+=2LL ){
    if( a[i]!=a[i+1] ) return 0;
    ans << 1;
    ans %= mod;
  }
    
  return ans;
}

int main(){
  long long N;
  cin >> N;
  for(long long i=0LL; i<N; i++){
    cin >> a[i];
  }

  cout << solve(N) << endl;

  return 0;
}
  


Compiler output:
a.cc:2:9: fatal error: algorythm: No such file or directory
    2 | #include<algorythm>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C++

#include<std/c++.h>
using namespace std;
const long long mod = 1e9+7;

long long solve(long long n, vector<long long> a){
  long long ans=1LL;
  sort( a.begin(), a.end() );

  if( (a[0] && n%2) || (a[0]==n%2 && n%2==0) ){
    return 0LL;
  }
  
  if( a[0]==0 ){
    a.erase(a.begin());
    n--;
  }

  for( long long i=0LL; i<n; i+=2LL ){
    if( a[i]!=a[i+1] ) return 0;
    ans << 1;
    ans %= mod;
  }
    
  return ans;
}

int main(){
  long long N;
  vector<long long> A;

  cin >> N;
  for(long long i=0LL; i<N; i++){
    cin >> A[i];
  }

  cout << solve(N, A) << endl;

  return 0;
}
  

Compiler output:
a.cc:1:9: fatal error: std/c++.h: No such file or directory
    1 | #include<std/c++.h>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>
#include<math.h>
int main(){
  int N;
  scanf("%d",&N);
  int A[N];
  for(int i = 0;i < N;i++){
    scanf("%d",&A[i]);
  }
  if(N % 2 == 0){
    for(int i = 1;i < N;i += 2){
      int cnt = 0;
      for(int j = 0;j < N;j++){
        if(i == A[j]){
          cnt++;
        }
      }
      if(cnt != 2){
        printf("0");
        return 0;
      }
    }
  }else{
    for(int i = 0;i < N;i += 2){
      int cnt = 0;
      for(int j = 0;j < N;j++){
        if(i == A[j]){
          cnt++;
        }
      }
      if(i == 0){
        if(cnt != 1){
          printf("0");
          return 0;
        }
      }else{
        if(cnt != 2){
          printf("0");
          return 0;
        }
      }
    }
  }
  if(N % 2 == 1){
    N--;
  }
  float ans1 = pow(2,N / 2);
  int ans = ans1 % 1000000007;
  printf("%d",ans);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:48:18: error: invalid operands to binary % (have 'float' and 'int')
   48 |   int ans = ans1 % 1000000007;
      |                  ^
Language: C++

#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <cmath> 
#define ll long long
#define MOD 1e9+7
ll a[100005];
using namespace std;

int main(){
	ll n;
	cin>>n;
	
	ll flag=1;//标志 
	ll ans=1;
	
	if(n%2==0){ //偶数 
		for(ll i=0;i<n;i++){
			ll x;
			cin>>x;
			a[x]++;
			if(x>=n || x%2==0 || a[x]>2){
				flag=0;
				cout<<"0"<<endl;
				break;
			}
			if(a[x]==1)
				ans=ans*2%MOD;
		}
	} 
	
	else{ //奇数 
		for(ll i=0;i<n;i++){
			ll x;
			cin>>x;
			a[x]++;
			if(x>=n || x%2==1 || a[0]>1 ||a[x]>2){
				flag=0;
				cout<<"0"<<endl;
				break;
			}
			if(x!=0 && a[x]==1)
				ans=ans*2%MOD;
		}
	}
	if(flag)
		cout<<ans<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:42: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   29 |                                 ans=ans*2%MOD;
      |                                     ~~~~~^
      |                                        |
      |                                        long long int
a.cc:44:42: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   44 |                                 ans=ans*2%MOD;
      |                                     ~~~~~^
      |                                        |
      |                                        long long int
Language: C++

#include <stdio.h>
#include <math.h>
#include <string.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <time.h>
#include <queue>
#include <string.h>
#define sf scanf
#define pf printf
#define lf double
#define ll long long
#define p123 printf("123\n");
#define pn printf("\n");
#define pk printf(" ");
#define p(n) printf("%d",n);
#define pln(n) printf("%d\n",n);
#define s(n) scanf("%d",&n);
#define ss(n) scanf("%s",n);
#define ps(n) printf("%s",n);
#define sld(n) scanf("%lld",&n);
#define pld(n) printf("%lld",n);
#define slf(n) scanf("%lf",&n);
#define plf(n) printf("%lf",n);
#define sc(n) scanf("%c",&n);
#define pc(n) printf("%c",n);
#define gc getchar();
#define re(n,a) memset(n,a,sizeof(n));
#define len(a) strlen(a)
#define LL long long
#define eps 1e-6
using namespace std;
int a[10001000];
const ll mod = 1e9 + 7;
// 快速幂 (a^b)%mod
// 如果求逆元，则b = mod-2;
ll pow_quick(ll a, ll b) {
  ll r = 1, base = a;
  while (b) {
    if (b & 1) {
      r *= base;
      r %= mod;

Compiler output:
a.cc: In function 'long long int pow_quick(long long int, long long int)':
a.cc:43:16: error: expected '}' at end of input
   43 |       r %= mod;
      |                ^
a.cc:41:16: note: to match this '{'
   41 |     if (b & 1) {
      |                ^
a.cc:43:16: error: expected '}' at end of input
   43 |       r %= mod;
      |                ^
a.cc:40:13: note: to match this '{'
   40 |   while (b) {
      |             ^
a.cc:43:16: error: expected '}' at end of input
   43 |       r %= mod;
      |                ^
a.cc:38:26: note: to match this '{'
   38 | ll pow_quick(ll a, ll b) {
      |                          ^
a.cc:43:16: warning: no return statement in function returning non-void [-Wreturn-type]
   43 |       r %= mod;
      |                ^
Language: C++

#include<bits/stdc++.h>
#include<queue>
#define REP(i,a) for(int (i)=0; (i)<(a); (i)++)
using namespace std;


int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  long long int N,ans;
  bool flag =true;
  cin>>N;
  int A[N],B[N]={};
  REP(i,N){
    cin>>A[i];
    B[A[i]]++;
    if(B[A[i]]>=3) flag=false;
  }
  if(B[0]>=2)flag=false; //真ん中が二人いるのはおかしい

  //N偶数の時はN-1,N-3,...,3,1,1,3,...,N-3,N-1
  //N奇数の時はN-1,N-3,...,2,0,2,4,...,N-3,N-1
  if(N%2==0){
    ans=pow(2,(N/2));
  }else{
    ans=pow(2,(N-1)/2);
  }

  ans=ans%(pow(10,9)+7);
  if(!flag)cout<<"0";
  else cout<<ans;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:10: error: invalid operands of types 'long long int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   29 |   ans=ans%(pow(10,9)+7);
      |       ~~~^~~~~~~~~~~~~~
      |       |             |
      |       long long int __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
#include<queue>
#define REP(i,a) for(int (i)=0; (i)<(a); (i)++)
using namespace std;


int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int N,ans;
  bool flag =true;
  cin>>N;
  int A[N],B[N]={};
  REP(i,N){
    cin>>A[i];
    B[A[i]]++;
    if(B[A[i]]>=3) flag=false;
  }
  if(B[0]>=2)flag=false; //真ん中が二人いるのはおかしい

  //N偶数の時はN-1,N-3,...,3,1,1,3,...,N-3,N-1
  //N奇数の時はN-1,N-3,...,2,0,2,4,...,N-3,N-1
  if(N%2==0){
    ans=pow(2,(N/2));
  }else{
    ans=pow(2,(N-1)/2);
  }

  ans=ans%(pow(10,9)+7);
  if(!flag)cout<<"0";
  else cout<<ans;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:10: error: invalid operands of types 'int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   29 |   ans=ans%(pow(10,9)+7);
      |       ~~~^~~~~~~~~~~~~~
      |       |             |
      |       int           __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
#include<queue>
#define REP(i,a) for(int (i)=0; (i)<(a); (i)++)
using namespace std;


int main(){
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int N,ans;
  bool flag =true;
  cin>>N;
  int A[N],B[N]={};
  REP(i,N){ 
    cin>>A[i];
    B[A[i]]++;
    if(B[A[i]]>=3) flag=false;
  }
  if(B[0]>=2)flag=false; //真ん中が二人いるのはおかしい

  //N偶数の時はN-1,N-3,...,3,1,1,3,...,N-3,N-1
  //N奇数の時はN-1,N-3,...,2,0,2,4,...,N-3,N-1
  if(N%2==0){
    ans=pow(2,(N/2));
  }else{
    ans=pow(2,(N-1)/2);
  }


  if(!flag)cout<<"0";
  else cout<<ans%(pow(10,9)+7);
    
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:17: error: invalid operands of types 'int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   31 |   else cout<<ans%(pow(10,9)+7);
      |              ~~~^~~~~~~~~~~~~~
      |              |             |
      |              int           __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include <iostream># {{{
using namespace std;

using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;
#include <string>
#include <cstdio>
#include <algorithm>
#include <vector>
#include <cmath>
#include <climits>
#include <bitset>
#include <array>
#include <deque>
#include <queue>
#include <map>
#define all(x) (x).begin(),(x).end()

const int MOD = 1e9 + 7;# }}}

void solve(){

}

int main(){
    int N;
    cin >> N;
    vector<int> a(N);
    vector<int> cnt(N);

    for (int i = 0; i < N; i++){
        cin >> a[i];
        cnt[a[i]]++;
    }

    bool ok = true;
    if (N % 2 == 0){
        if (cnt[0] != 0) {
            ok = false;
        }
        for (int i = 1; i < N; i += 2){
            if (cnt[i] != 2){
                ok = false;
                break;
            }
        }
    } else {
        if (cnt[0] != 1) {
            ok = false;
        }
        for (int i = 2; i < N; i += 2) {
            if (cnt[i] != 2) {
                ok = false;
                break;
            }
        }
    }

    ll ans;
    if (ok) {
        ans = 1;
        for (int i = 0; i < N/2; i++){
            ans *= 2;
            ans %= MOD;
        }
    } else {
        ans = 0;
    }

    cout << ans << endl;

    return 0;
}


Compiler output:
a.cc:1:20: warning: extra tokens at end of #include directive
    1 | #include <iostream># {{{
      |                    ^
a.cc:20:25: error: stray '#' in program
   20 | const int MOD = 1e9 + 7;# }}}
      |                         ^
a.cc:20:27: error: expected declaration before '}' token
   20 | const int MOD = 1e9 + 7;# }}}
      |                           ^
a.cc:20:28: error: expected declaration before '}' token
   20 | const int MOD = 1e9 + 7;# }}}
      |                            ^
a.cc:20:29: error: expected declaration before '}' token
   20 | const int MOD = 1e9 + 7;# }}}
      |                             ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define MM 1000000000;
#define mod MM + 7;
#define INF (ll)1e18
#define pi acos(-1.0)
#define MAX 1000000005
#define NIL -1
int main(){
    ll n; cin >> n;
    bool flg = true;
    ll ans = 1;
    ll a[n];
    for(ll i = 0; i < n; i++){
        cin >> a[i];
    }
    sort(a, a + n);
    if(n%2 && a[0]) flg = false;
    if(n%2) a.erase(a.begin());
    for(ll i = 0; i < a.size(); i += 2){
        if(a[i] != a[i+1] || a[i] != i+1+n%2){
            flg = false;
        }
    }
    if(flg){
        for(int i = 0; i < n/2; i++){
            ans *= 2;
            ans %= mod;
        }
    } else {
        ans = 0;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:15: error: request for member 'erase' in 'a', which is of non-class type 'll [n]' {aka 'long long int [n]'}
   20 |     if(n%2) a.erase(a.begin());
      |               ^~~~~
a.cc:20:23: error: request for member 'begin' in 'a', which is of non-class type 'll [n]' {aka 'long long int [n]'}
   20 |     if(n%2) a.erase(a.begin());
      |                       ^~~~~
a.cc:21:25: error: request for member 'size' in 'a', which is of non-class type 'll [n]' {aka 'long long int [n]'}
   21 |     for(ll i = 0; i < a.size(); i += 2){
      |                         ^~~~
Language: C++

#include <bits/stdc++.h>

#define MOD 1000000007

template<typename T>
T power(T a, T b)
{
    T res = 1;
    while(b > 0) {
        if(b & 1) res = res * a % MOD;
        a = a * a % MOD;
        b >>= 1;
    }
    return res;
}

using namespace std;

int main()
{
    long N;
    long A[100001];
    map<long, long> count;

    cin >> N;
    for(long i = 1; i <= N; ++i) {
        cin >> A[i];
        count[A[i]]++;
    }

    if(N % 2 == 1) {
        if(count[0] != 1) goto fail;
        for(long i = 1; i < N; i++) {
            if(i % 2 == 1) {
                if(count[i] != 0) goto fail;
            }
            else {
                if(count[i] != 2) goto fail;
            }
        }
    }
    else {
        for(long i = 0; i < N; ++i) {
            if(i % 2 == 1) {
                if(count[i] != 2) goto fail;
            }
            else {
                if(count[i] != 0) goto fail;
            }
        }
    }

    cout << (N % 2 == 1 ? power(long(2), (N-1)/2) : power(long(2), (N/2))) << endl;
    return 0;

fail:
    cout << 0 << endl;
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:58:14: error: expected '}' at end of input
   58 |     return 0;
      |              ^
a.cc:20:1: note: to match this '{'
   20 | {
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define MM = 1000000000;
#define mod = MM + 7;
#define INF (ll)1e18
#define pi acos(-1.0)
#define MAX 100005
#define NIL -1
int main(){
    ll n; cin >> n;
    ll a[n];
    map<ll, int> mp;
    ll ans = 0;
    for(ll i = 0; i < n; i++){
        cin >> a[i];
        mp[a[i]]++;
    }
    sort(a, a+n);
    bool flag = true;
    if(n%2 == 0){
        for(ll i = 0; i < n; i+2){
            if(mp[a[i]] != 2){
                flag = false;
            }
        }
    } else {
        if(a[0] == 0){
            for(ll i = 2; i < n; i++){
                if(mp[a[i]] != 2){
                    flag = false;
                }
            }
        }
    }
    if(flag){
        ans = 1;
        for(ll i = 1; i < n/2; i++){
            ans *= 2;
            ans %= mod;
        }
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:13: error: expected primary-expression before '=' token
    5 | #define mod = MM + 7;
      |             ^
a.cc:40:20: note: in expansion of macro 'mod'
   40 |             ans %= mod;
      |                    ^~~
a.cc:4:12: error: expected primary-expression before '=' token
    4 | #define MM = 1000000000;
      |            ^
a.cc:5:15: note: in expansion of macro 'MM'
    5 | #define mod = MM + 7;
      |               ^~
a.cc:40:20: note: in expansion of macro 'mod'
   40 |             ans %= mod;
      |                    ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
	int n;
	cin>>n;

	int ans = 0;
  bool check=false;
  int a[n];

	for (int i=0; i<n; i++) {
    cin>>a[i];
	}

  sort(a,a+n);

  if(n%2==1){ //奇数個(中央0)
    for(int i=0;i<=n/2;i++){
      if(a[0]!=0){
        break;
      }
      if(i>0){
        if(a[i*2-1]!=i*2||a[i*2-1]!=a[i*2])
          break;
      }
      if(i==n/2){
        check=true;
      }
    }
  }
  else{
    for(int i=0;i<n/2-1;i++){
      if(a[i*2]!=i*2+1||a[i*2]!=a[i*2+1]){
         break;
      }
      if(i==n/2-2){
        check=true;
      }
    }
  }
	cout << (check?(pow(2,n/2)%(1e9+7)):0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:35: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'double' to binary 'operator%'
   43 |         cout << (check?(pow(2,n/2)%(1e9+7)):0) << endl;
      |                         ~~~~~~~~~~^~~~~~~~
      |                            |           |
      |                            |           double
      |                            __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

N = int(input())
A = [int(x) for x in input().split()]
if not N%2:
    result = 2**(N/2)
    A.sort()
    for i in range(0,N-1,2):
        if A[i] != A[i+1]:
            result = 0
else:
    result = 2**(N/2 - 1)
    for i in range(1,N,2):
        if A[i] != A[i+1]:
            result = 0
print(int(result))

Compiler output:
a.cc:1:1: error: 'N' does not name a type
    1 | N = int(input())
      | ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;

ll n,a[100001],temp,flag,mod=(ll)1e9+7;

int main(void){
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>temp;
        a[temp]++;
    }
    if((n+1) % 2 == 0){
        if(a[0] != 1)flag=1;
        for(int i=1;i<n/2+1;i++){
            if(a[i*2] != 2)flag=1;
            if(a[i*2-1] != 0)flag=1;
        }
        if(flag)cout<<0<<endl;
        else cout<<pow(2,n/2)%mod<<endl;
    }
    else{
        for(int i=1;i<n/2+1;i++){
            if(a[i*2-1] != 2)flag=1;
            if(a[i*2] != 0)flag=1;
        }
        if(flag)cout<<0<<endl;
        else cout<<pow(2,n/2)%mod<<endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:30: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'll' {aka 'long long int'} to binary 'operator%'
   21 |         else cout<<pow(2,n/2)%mod<<endl;
      |                    ~~~~~~~~~~^~~~
      |                       |       |
      |                       |       ll {aka long long int}
      |                       __gnu_cxx::__promote<double>::__type {aka double}
a.cc:29:30: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'll' {aka 'long long int'} to binary 'operator%'
   29 |         else cout<<pow(2,n/2)%mod<<endl;
      |                    ~~~~~~~~~~^~~~
      |                       |       |
      |                       |       ll {aka long long int}
      |                       __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<iostream>
using namespace std;
int main() {
	long long N;
	cin >> N;
	long long A[N];
	for (long long i = 0; i < N; i++) {
		cin >> A[i];
	}
	long long cnt[N + 1] = {};
	bool flg = true;
	for (long long i = 0; i < N; i++) {
		int j = A[i];
		cnt[j]++;

	}
	for (long long i = 0; i < N; i++) {
		if (cnt[0] >= 2) {
			flg = false;
		}
		if (i != 0) {
			if (cnt[i] % 2 != 0) {
				flg = false;
			}
		}
		if (cnt[i] >= 3) {
			flg = false;
		}
		if (!flg) {
			cout << "0" << endl;
			return 0;
		}
	}
	
	int ans = 1;
	if (N % 2 == 0) {
		if (cnt[0] != 0) {
			cout << 0 << endl;
			return 0;
		}
		for (long long i = 0; i < N / 2; i++) {
			ans = ans*2;
			ans %= (1e9 + 7);
		}
	}
	
	else {
		for (long long i = 0; i < (N-1) / 2; i++) {
			ans = ans*2;
			ans %= (1e9 + 7);
		}
	}
	
	cout <<ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:29: error: invalid operands of types 'int' and 'double' to binary 'operator%'
   43 |                         ans %= (1e9 + 7);
      |                         ~~~~^~~~~~~~~~~~
a.cc:43:29: note:   in evaluation of 'operator%=(int, double)'
a.cc:50:29: error: invalid operands of types 'int' and 'double' to binary 'operator%'
   50 |                         ans %= (1e9 + 7);
      |                         ~~~~^~~~~~~~~~~~
a.cc:50:29: note:   in evaluation of 'operator%=(int, double)'
Language: C++

#include<iostream>
using namespace std;
int main() {
	long long N;
	cin >> N;
	long long A[N];
	for (long long i = 0; i < N; i++) {
		cin >> A[i];
	}
	long long cnt[N + 1] = {};
	bool flg = true;
	for (long long i = 0; i < N; i++) {
		int j = A[i];
		cnt[j]++;

	}
	for (long long i = 0; i < N; i++) {
		if (cnt[0] >= 2) {
			flg = false;
		}
		if (i != 0) {
			if (cnt[i] % 2 != 0) {
				flg = false;
			}
		}
		if (cnt[i] >= 3) {
			flg = false;
		}
		if (!flg) {
			cout << "0" << endl;
			return 0;
		}
	}
	
	long long ans = 1;
	if (N % 2 == 0) {
		if (cnt[0] != 0) {
			cout << 0 << endl;
			return 0;
		}
		for (long long i = 0; i < N / 2; i++) {
			ans = ans*2;
			ans %= (1e9 + 7);
		}
	}
	
	else {
		for (long long i = 0; i < (N-1) / 2; i++) {
			ans = ans*2;
			ans %= (1e9 + 7);
		}
	}
	
	cout <<ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:29: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   43 |                         ans %= (1e9 + 7);
      |                         ~~~~^~~~~~~~~~~~
a.cc:43:29: note:   in evaluation of 'operator%=(long long int, double)'
a.cc:50:29: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   50 |                         ans %= (1e9 + 7);
      |                         ~~~~^~~~~~~~~~~~
a.cc:50:29: note:   in evaluation of 'operator%=(long long int, double)'
Language: C++

#include<iostream>
#include<vector>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<string>
#include<bits/stdc++.h>
#define ll long long
using namespace std;

int main(){
  int n; cin >> n;
  ll ans;
  int n_div = n/2;
  vector<int> a(0);
  int s;
  int count = 0;
  
  for(int i = 1; i <= n; i++){
    cin >> s;
    a.push_back(s);
  }
  sort(a.begin(), a.end(), greater<int>());
  for(int i = 0; 1 < a.size(); i+0){
    if(a[0] == a[1]){
      a.erase(a.begin());
      a.erase(a.begin());
    } else {
      ans = 0;
      break;
    }
  }
  if(a.size() == 1 && a[0] == 0){
    ans = pow(2, n_div);
  } else if(a.size() == 0){
    ans = pow(2, n_div);
  }
  if(ans == 0){
    cout << 0 << endl;
  } else {
    cout << ans % (pow(10, 9) + 7) << endl;
  }
}



Compiler output:
a.cc: In function 'int main()':
a.cc:41:17: error: invalid operands of types 'long long int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   41 |     cout << ans % (pow(10, 9) + 7) << endl;
      |             ~~~ ^ ~~~~~~~~~~~~~~~~
      |             |                 |
      |             long long int     __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main() {
	long long N;
	cin >> N;
	long long A[N];
	for (long long i = 0; i < N; i++) {
		cin >> A[i];
	}
	long long cnt[N] = {};
	bool flg = true;
	for (long long i = 0; i < N; i++) {
		cnt[A[i]]++;
	}
	for (long long i = 0; i < N; i++) {
		if (cnt[0] >= 2) {
			flg = false;
		}
		if (i != 0) {
			if (cnt[i] % 2 != 0) {
				flg = false;
			}
		}
		if (cnt[i] >= 3) {
			flg = false;
		}
		if (!flg) {
			cout << 0 << endl;
			return 0;
		}
	}
	long long ans = 1;
	if (N % 2 == 0) {
		for (long long i = 0; i < N / 2; i++) {
			ans *= 2;
		}
	}
	
	else {
		for (long long i = 0; i < (N-1) / 2; i++) {
			ans *= 2;
		}
	}
	cout << ans % (1e9 + 7);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:21: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   44 |         cout << ans % (1e9 + 7);
      |                 ~~~ ^ ~~~~~~~~~
      |                 |          |
      |                 |          double
      |                 long long int
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main() {
	int N;
	cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> A[i];
	}
	int cnt[N] = {};
	bool flg = true;
	for (int i = 0; i < N; i++) {
		cnt[A[i]]++;
	}
	for (int i = 0; i < N; i++) {
		if (A[0] >= 2) {
			flg = false;
		}
		if (i != 0) {
			if (A[i] % 2 != 0) {
				flg = false;
			}
		}
		if (!flg) {
			cout << 0 << endl;
			return 0;
		}
	}
	int ans = 1;
	if (N % 2 == 0) {
		for (int i = 0; i < N / 2; i++) {
			ans *= 2;
		}
	}
	else {
		for (int i = 0; i < (N-1) / 2; i++) {
			ans *= 2;
		}
	}
	cout << ans % (1e9 + 7) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:24: error: 'A' was not declared in this scope
    7 |                 cin >> A[i];
      |                        ^
a.cc:12:21: error: 'A' was not declared in this scope
   12 |                 cnt[A[i]]++;
      |                     ^
a.cc:15:21: error: 'A' was not declared in this scope
   15 |                 if (A[0] >= 2) {
      |                     ^
a.cc:19:29: error: 'A' was not declared in this scope
   19 |                         if (A[i] % 2 != 0) {
      |                             ^
a.cc:39:21: error: invalid operands of types 'int' and 'double' to binary 'operator%'
   39 |         cout << ans % (1e9 + 7) << endl;
      |                 ~~~ ^ ~~~~~~~~~
      |                 |          |
      |                 int        double
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<vector>


using namespace std;

int main()
{
	int N;
	int count;
	int answer=1;
	bool can = true;
	vector<int> A(10000);
	cin >> N;
	for (int i = 1; i < N + 1; ++i) cin >> A[i];

	if (N % 2 == 0) {//Nが偶数の場合
		//並びがありうるかどうかの確認
		for (int j = 1; j < N ; j=j+2) {
			count = 0;
			for (int i = 1; i < N + 1; ++i) {
				if (j == A[i]) {
					count++;
				}
			}

			if (count == 2) {
				can = can & true;
			}
			else {
				can = false;
			}
		}
		
		for (int i = 0; i < N / 2; ++i) {
			answer *= 2;
		}
		answer = pow(2, N / 2);


		answer = answer % 1000000007;
		if (can) {
			cout << answer << endl;
		}else {
			cout << 0 << endl;
		}
	}
	else {//Nが奇数の場合
			//並びがありうるかどうかの確認
		count = 0;
		for (int i = 1; i < N + 1; ++i) {
			if (0 == A[i]) {
				count++;
			}
		}

		if (count == 1) {
			can = can & true;
		}


		for (int j = 2; j < N+1; j = j + 2) {
			count = 0;
			for (int i = 1; i < N + 1; ++i) {
				if (j == A[i]) {
					count++;
				}
			}

			if (count == 2) {
				can = can & true;
			}else{
				can = false;
			}
		}
		
		
		for (int i = 0; i < N / 2; ++i) {
			answer *= 2;
		}

		answer= answer  % 1000000007;
		if (can) { 
			cout << answer << endl;
		}
		else {
			cout << 0 << endl;
		}
	}
	

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:40:26: error: 'pow' was not declared in this scope
   40 |                 answer = pow(2, N / 2);
      |                          ^~~
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<vector>



using namespace std;

int main()
{
	int N;
	int count;
	int answer;
	bool can = true;
	vector<int> A(10000);
	cin >> N;
	for (int i = 1; i < N + 1; ++i) cin >> A[i];

	if (N % 2 == 0) {//Nが偶数の場合
		//並びがありうるかどうかの確認
		for (int j = 1; j < N ; j=j+2) {
			count = 0;
			for (int i = 1; i < N + 1; ++i) {
				if (j == A[i]) {
					count++;
				}
			}

			if (count == 2) {
				can = can & true;
			}
			else {
				can = false;
			}
		}
		answer = pow(2, N / 2);
		answer = answer % 1000000007;
		if(can) cout << answer << endl;
	}
	else {//Nが奇数の場合
			//並びがありうるかどうかの確認
		count = 0;
		for (int i = 1; i < N + 1; ++i) {
			if (0 == A[i]) {
				count++;
			}
		}

		if (count == 1) {
			can = can & true;
		}


		for (int j = 2; j < N+1; j = j + 2) {
			count = 0;
			for (int i = 1; i < N + 1; ++i) {
				if (j == A[i]) {
					count++;
				}
			}

			if (count == 2) {
				can = can & true;
			}else{
				can = false;
			}
		}
		answer = pow(2, N / 2);
		answer= answer  % 1000000007;
		if (can) { 
			cout << answer << endl;
		}
		else {
			cout << 0 << endl;
		}
	}
	

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:37:26: error: 'pow' was not declared in this scope
   37 |                 answer = pow(2, N / 2);
      |                          ^~~
a.cc:69:26: error: 'pow' was not declared in this scope
   69 |                 answer = pow(2, N / 2);
      |                          ^~~
Language: C++

#include <iostream>
#include <vector>
#include <unordered_map>
#include <algorithm>
using namespace std;

int mkhash(vector<int> v) {
    int h = 0;
    for (int i = 0; i < v.size(); i++) {
        h += v[i] * pow(10, i);
    }
    return h;
}

int main(int argc, char const* argv[])
{
    cin.tie(0);
    ios::sync_with_stdio(false);

    int N;
    cin >> N;

    vector<int> A(N);
    for (int i = 0; i < N; i++) {
        cin >> A[i];
    }

    vector<int> O(N);
    for (int i = 0; i < N; i++) {
        O[i] = i;
    }

    int total = 0;
    unordered_map<int, int> cache;
    do {
        vector<int> T(N);
        for (int i = 0; i < N; i++) {
            T[i] = A[O[i]];
        }

        int h = mkhash(T);
        if (cache[h] == 1) {
            continue;
        }
        if (cache[h] == 2) {
            ++total;
            continue;
        }

        bool yes = true;
        for (int i = 0; i < N; i++) {
            if (T[i] != abs(N - i - 1 - i)) {
                yes = false;
                cache[h] = 1;
                break;
            }
        }

        if (yes) {
            cache[h] = 2;
            ++total;
        }
    } while (next_permutation(O.begin(), O.end()));

    cout << total << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int mkhash(std::vector<int>)':
a.cc:10:21: error: 'pow' was not declared in this scope
   10 |         h += v[i] * pow(10, i);
      |                     ^~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

const int maxn = 1e5+100;
const long long Mod = 1e9+7;
long long ans, a, t[maxn],n;

int main(){
    cin >> n;
    for(int i=0; i<n; i++){
        cin >> a;
        t[a]++;
    }
    ans = 1;
    if(n%2 == 1){
        for(int i=0; i<n; i+=2){
            if((i!=0 && t[i]!=2) || (i==0 && t[i]!=1)){
                cout << 0;
                return 0;
            }
            if(i!=0) ans = (ans*2) % Mod;
        }
        cout << ans;
    }
    else{
        for(int i=1; i<n; i+=2){
            if(t[i]!=2){
                cout << 0;
                return 0;
            }
             ans = (ans*2)%Mod;
        }
        count << ans;
    }
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:15: error: invalid operands of types '<unresolved overloaded function type>' and 'long long int' to binary 'operator<<'
   34 |         count << ans;
      |         ~~~~~~^~~~~~
Language: C

#include<stdio.h>
#include<math.h>
int main(){
   long n;
   scanf(“%d”,&n);
   long a[n];
   int ans=1;
   for(long i=0;i<n;i++){
       scanf(“%d”,&a[i]);
   }
   long temp;
   for(long i=0;i<n;i++){//sort
       for(long j=i+1;j<n;j++){
           if(a[i]>a[j]){
               temp=a[j];
               a[j]=a[i];
               a[i]=temp;
           }
       }

   }
   for(long i=0;i<n;i+=2){
           if(a[i]!=i+1-n%2){
               ans=0;
               break;
           }
   }

   if(ans==0){
       printf(“%d\n”,ans);
   }else{
       long x=pow(10,9)+7;
       unsigned long y;
       if(n>pow(10,3)){
           y=pow(2,(n-500-n%2)/2);
           y=y%x;
           x=(long)pow(2,250)%x;
           y=y*x;
       }else{
           y=pow(2,(n-n%2)/2);
       y=y%x;
       }
       printf(“%ld\n”,y);
   }
}

Compiler output:
main.c: In function 'main':
main.c:5:10: error: stray '\342' in program
    5 |    scanf(<U+201C>%d<U+201D>,&n);
      |          ^~~~~~~~
main.c:5:11: error: expected expression before '%' token
    5 |    scanf(“%d”,&n);
      |           ^
main.c:5:13: error: stray '\342' in program
    5 |    scanf(<U+201C>%d<U+201D>,&n);
      |                    ^~~~~~~~
main.c:9:14: error: stray '\342' in program
    9 |        scanf(<U+201C>%d<U+201D>,&a[i]);
      |              ^~~~~~~~
main.c:9:15: error: expected expression before '%' token
    9 |        scanf(“%d”,&a[i]);
      |               ^
main.c:9:17: error: stray '\342' in program
    9 |        scanf(<U+201C>%d<U+201D>,&a[i]);
      |                        ^~~~~~~~
main.c:30:15: error: stray '\342' in program
   30 |        printf(<U+201C>%d\n<U+201D>,ans);
      |               ^~~~~~~~
main.c:30:16: error: expected expression before '%' token
   30 |        printf(“%d\n”,ans);
      |                ^
main.c:30:18: error: stray '\' in program
   30 |        printf(“%d\n”,ans);
      |                  ^
main.c:30:20: error: stray '\342' in program
   30 |        printf(<U+201C>%d\n<U+201D>,ans);
      |                           ^~~~~~~~
main.c:43:15: error: stray '\342' in program
   43 |        printf(<U+201C>%ld\n<U+201D>,y);
      |               ^~~~~~~~
main.c:43:16: error: expected expression before '%' token
   43 |        printf(“%ld\n”,y);
      |                ^
main.c:43:19: error: stray '\' in program
   43 |        printf(“%ld\n”,y);
      |                   ^
main.c:43:21: error: stray '\342' in program
   43 |        printf(<U+201C>%ld\n<U+201D>,y);
      |                            ^~~~~~~~
Language: C

#include<stdio.h>
#include<math.h>
int main(){
   long n;
   scanf(“%ld”,&n);
   long a[n];
   int ans=1;
   for(long i=0;i<n;i++){
       scanf(“%ld”,&a[i]);
   }
   long temp;
   for(long i=0;i<n;i++){//sort
       for(long j=i+1;j<n;j++){
           if(a[i]>a[j]){
               temp=a[j];
               a[j]=a[i];
               a[i]=temp;
           }
       }

   }
   for(long i=0;i<n;i+=2){
           if(a[i]!=i+1-n%2){
               ans=0;
               break;
           }
   }

   if(ans==0){
       printf(“%d\n”,ans);
   }else{
       long x=pow(10,9)+7;
       unsigned long y;
       if(n>pow(10,3)){
           y=pow(2,(n-500-n%2)/2);
           y=y%x;
           x=(long)pow(2,250)%x;
           y=y*x;
       }else{
           y=pow(2,(n-n%2)/2);
       y=y%x;
       }
       printf(“%ld\n”,y);
   }
}

Compiler output:
main.c: In function 'main':
main.c:5:10: error: stray '\342' in program
    5 |    scanf(<U+201C>%ld<U+201D>,&n);
      |          ^~~~~~~~
main.c:5:11: error: expected expression before '%' token
    5 |    scanf(“%ld”,&n);
      |           ^
main.c:5:14: error: stray '\342' in program
    5 |    scanf(<U+201C>%ld<U+201D>,&n);
      |                     ^~~~~~~~
main.c:9:14: error: stray '\342' in program
    9 |        scanf(<U+201C>%ld<U+201D>,&a[i]);
      |              ^~~~~~~~
main.c:9:15: error: expected expression before '%' token
    9 |        scanf(“%ld”,&a[i]);
      |               ^
main.c:9:18: error: stray '\342' in program
    9 |        scanf(<U+201C>%ld<U+201D>,&a[i]);
      |                         ^~~~~~~~
main.c:30:15: error: stray '\342' in program
   30 |        printf(<U+201C>%d\n<U+201D>,ans);
      |               ^~~~~~~~
main.c:30:16: error: expected expression before '%' token
   30 |        printf(“%d\n”,ans);
      |                ^
main.c:30:18: error: stray '\' in program
   30 |        printf(“%d\n”,ans);
      |                  ^
main.c:30:20: error: stray '\342' in program
   30 |        printf(<U+201C>%d\n<U+201D>,ans);
      |                           ^~~~~~~~
main.c:43:15: error: stray '\342' in program
   43 |        printf(<U+201C>%ld\n<U+201D>,y);
      |               ^~~~~~~~
main.c:43:16: error: expected expression before '%' token
   43 |        printf(“%ld\n”,y);
      |                ^
main.c:43:19: error: stray '\' in program
   43 |        printf(“%ld\n”,y);
      |                   ^
main.c:43:21: error: stray '\342' in program
   43 |        printf(<U+201C>%ld\n<U+201D>,y);
      |                            ^~~~~~~~
Language: C++

#include <stdio.h>
int main(void)
{
	int n,a[100001];
	scanf("%d",&n);
	for(i=0; i<n; i++)scanf("%d",&a[i]);
	puts("0");
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: 'i' was not declared in this scope
    6 |         for(i=0; i<n; i++)scanf("%d",&a[i]);
      |             ^