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

#include<bits/stdc++.h>
#define ll long long
using namespace std;
bool sortbysec(const pair<int,int> &a,
              const pair<int,int> &b)
{
    return (a.second < b.second&&a.first<b.first);
}

void solve(){
    int n,val;
    cin>>n;
    map<int,int>mp;
    for(int i=0;i<n;i++){
        cin>>val;
        if(mp.find(val)!=mp.end()){
            if(val==0||mp[val]==2){
                cout<<0;
                return;
            }
            mp[val]++;
        }else{
            mp[val]=0;
        }
    }
    if(n&1){
        cout<<(1<<(n-1)/2);
    }else
        cout<<(1<<n/2);

}


int main(){
    /*int t;
    cin>>t;
    while(t--)*/
        solve();


    return 0;
}
































































//1-(3+5-2+(3+19-(3-1-4+(9-4-(4-(1+(3)-2)-5)+8-(3-5)-1)-4)-5)-4+3-9)-4-(3+2-5)-10




















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

#include <bits/stdc++.h>
#define arep(a,i,n) for(ll i=(a);i<(n);i++)
#define rep(i,n) for(ll i=0;i<(n);i++)
#define cinf(x,n) for(ll i=0;i<(n);i++)cin>>x[i];
#define coutf(x,n) for(ll i=0;i<(n);i++)cout<<x[i]<<endl;
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;

using namespace std;

ll a[100001];
ll ans[100001];
ll cnt[100001];
ll sum=1;

ll fact(ll num){
	ll tmp=1;
	while(num){
		tmp*=(num%mod);
		tmp%=mod;
		num--;
	}
	return tmp%mod;
}

int main(){
	int mod = 1e9+7;
	ll n;
	cin >> n;
	rep(i,n){
		cin >> a[i];
		cnt[a[i]]++;
	}
	sort(a,a+n);
	rep(i,n){
		if(i%2==0)
			ans[i/2]=a[n-i-1];
		else
			ans[n-(i+1)/2]=a[n-i-1];
	}
	rep(i,n){
		if(ans[i]!=abs(n-2*i-1)){
			cout << "0" << endl;
			return 0;
		}
	}
	rep(i,n){
		if(cnt[i]!=0){
			sum*=fact(cnt[i])%mod;
		}
	}
	cout << sum%mod << endl;
}

Compiler output:
a.cc: In function 'll fact(ll)':
a.cc:20:27: error: 'mod' was not declared in this scope; did you mean 'modf'?
   20 |                 tmp*=(num%mod);
      |                           ^~~
      |                           modf
a.cc:24:20: error: 'mod' was not declared in this scope; did you mean 'modf'?
   24 |         return tmp%mod;
      |                    ^~~
      |                    modf
Language: C++

#include <bits/stdc++.h>
#include <string>
#include <algorithm>
using namespace std; //std::の省略のため
using ll = long long;

const int MOD = 1000000007;

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

    ll a[n];
    ll cnt[n] = {};

    bool judge = true;

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

    if(n%2 == 0){
        for(int i=0; i<n; i++){
            cnt[a[i]]++;
            if(cnt[a[i]] > 0 && a[i] == 0){
                judge = false;
                break;
            }
            else if(cnt[a[i]] > 2){
                judge = false;
                break;
            }
        }
        
    }
    else{
        for(int i=0; i<n; i++){
            cnt[a[i]]++;
            if(cnt[a[i]] > 1 && a[i] == 0){
                judge = false;
                break;
            }
            else if(cnt[a[i]] > 2){
                judge = false;
                break;
            }
        }
    }

    if(judge){
        cout << pow(2, n/2)%MOD << endl;
    }
    else{
        cout << 0 << endl;
    }

    }


Compiler output:
a.cc: In function 'int main()':
a.cc:51:28: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'const int' to binary 'operator%'
   51 |         cout << pow(2, n/2)%MOD << endl;
      |                 ~~~~~~~~~~~^~~~
      |                    |        |
      |                    |        const int
      |                    __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int n;
  cin >> n;
  
  vector<int> A(n);
  for (int i = 0; i < n; i++) {
    cin >> A.at(i);
  }
  
  map<int, int> cnt;
  for (int x : A) {
    if (cnt.count(x)) {
      cnt.at(x)++;
    } 
    else {
      cnt[x] = 1;
    }
  }
  
  bool ans = true;
  
  if(n%2 == 0){
    for (int x : A) {
      if(x == 0 && cnt.at(x) > != 0){
        ans = false;
        break;
      }
        
      if(x != 0 && cnt.at(x) != 2){
        ans = false;
        break;
      }
    }
  }
  
  if(n%2 != 0){
    for (int x : A) {
      if(x == 0 && cnt.at(0) != 1){
        ans = false;
        break;
      }
      if(x != 0 && cnt.at(x) != 2){
        ans = false;
        break;
      }
    }
  }

  if(ans){
    int t = n / 2;
    int s = 1;
    
    for (int i = 0; i < t; i++) {
      s *= 2;
    }
    int64_t str = s%(1000000000 + 7);
    
    cout << str << endl;
  }
  else{
    cout << 0 << endl;
  }
  

}
             
 


Compiler output:
a.cc: In function 'int main()':
a.cc:27:32: error: expected primary-expression before '!=' token
   27 |       if(x == 0 && cnt.at(x) > != 0){
      |                                ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define in insert
#define PI 3.1415926535897932384626433832795
#define MOD = 1e9 + 7;
#define F first
#define S second
#define aLL(str) (str).begin(), (str).end()
#define IOS                  \
    ios::sync_with_stdio(0); \
    cin.tie(0);              \
    cout.tie(0)
#define ll long long
#define ld long double
#define lcm(a, b) (a * b) / __gcd(a, b)
#define flu(i, a, b) for (ll i = a; i < b; i++)
#define blu(i, a, b) for (ll i = a; i >= b; i--)
#define upper(s) transform(s.begin(), s.end(), s.begin(), ::toupper)
#define lower(s) transform(s.begin(), s.end(), s.begin(), ::tolower)
#define Unique(X) (X).erase(unique(all(X)), (X).end())
#define all(v) v.begin(), v.end()
typedef vector<ll> vl;
typedef map<ll, ll> ml;
typedef vector<string> vs;
typedef vector<vector<int>> vvi;
char e = '\n';
ll i, j, le;

int sv(int x)
{
    int n = 200000;
    // Create a boolean array "prime[0..n]" and initialize
    // all entries it as true. A value in prime[i] will
    // finally be false if i is Not a prime, else true.
    bool prime[n + 1];
    memset(prime, true, sizeof(prime));

    for (int p = 2; p * p <= n; p++)
    {
        // If prime[p] is not changed, then it is a prime
        if (prime[p] == true)
        {
            // Update all multiples of p greater than or
            // equal to the square of it
            // numbers which are multiple of p and are
            // less than p^2 are already been marked.
            for (int i = p * p; i <= n; i += p)
                prime[i] = false;
        }
    }
    if (prime[x])
        return 1;
    else
        return 0;
}

int main()
{
    IOS;
    int t;
    // cin >> t;
    t=1;
    while (t--)
    {
        ll n, ans=1, f;
        cin>>n;
        vl v(n);
        ml mp;
        flu(i, 0, n)
            cin>>v[i], mp[v[i]]++;
        if (n%2==0)f=1;
        else f=0;
        ll c=0;
        if (mp[0]>1)c=1;
        flu(i, 0, n)
            if (v[i]%2!=f && mp[v[i]]>2)
            {
                c=1;break;
            }
        if (c==1)cout<<0<<endl;
        else {
            n/=2;
            f=1;
            while (n--) {
                f=(f*2)%MOD;

            }
            cout<<f<<endl;
        }
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: expected primary-expression before '=' token
    6 | #define MOD = 1e9 + 7;
      |             ^
a.cc:86:25: note: in expansion of macro 'MOD'
   86 |                 f=(f*2)%MOD;
      |                         ^~~
Language: C++

//题意：n个人编号1-n站成一排，每个人左边的人数和右边的人数的差的绝对值为Ai，求可能的站的方案数的个数；n范围1e5
//方案数要取模1e9+7，没有这样的方案就输出0 
//思路： 看了一下样例，感觉找到了规律啊。如果n是奇数的话，那么一定有一个0（也就是站在中间），2，2,4,4...,(n-1)；
//满足的话方案数为(n-1) 
//如果n是偶数的话，那么一定有1，1，3，3，5，5，n-1,n-1，满足的话方案数为2*n ；不满足以上条件则为0； 
#include <iostream>
#include <cmath>
using namespace std;
const int mod=1e9+7;
typedef long long LL;
const int N=1e5+10;
int n, b[N];

int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		int x;
		cin>>x;
		b[x]++;
	}
	
	if(n==1){
		if(b[1]!=0) cout<<0;
		else cout<<1;
		return 0;	
	} 
	
	if(n%2==0){
		bool is_ok=true;
		for(int i=0;i<=n-1;i++)
		{
			if(i%2==0)
			{
				if(b[i]!=0){
					is_ok=false;
					break;	
				}	
			}
			else{
				if(b[i]!=2){
					is_ok=false;
					break;	
				}
			} 
		}
		if(!is_ok) cout<<0;
		else cout<<pow(2,n/2)%mod;
	}else{
		bool is_ok=true;
		for(int i=0;i<=n-1;i++)
		{
			if(i==0){
				if(b[i]!=1){
					is_ok=false;
					break;
				}
			}
			else{
				if(i%2==0){
					if(b[i]!=2){
						is_ok=false;
						break;
					}
				}else{
					if(b[i]!=0){
						is_ok=false;
						break;
					}
				}
			}
		}
		if(!is_ok) cout<<0;
		else cout<<n-1;
	}
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:38: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'const int' to binary 'operator%'
   47 |                 else cout<<pow(2,n/2)%mod;
      |                            ~~~~~~~~~~^~~~
      |                               |       |
      |                               |       const int
      |                               __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

//题意：n个人编号1-n站成一排，每个人左边的人数和右边的人数的差的绝对值为Ai，求可能的站的方案数的个数；n范围1e5
//方案数要取模1e9+7，没有这样的方案就输出0 
//思路： 看了一下样例，感觉找到了规律啊。如果n是奇数的话，那么一定有一个0（也就是站在中间），2，2,4,4...,(n-1)；
//满足的话方案数为(n-1) 
//如果n是偶数的话，那么一定有1，1，3，3，5，5，n-1,n-1，满足的话方案数为2*n ；不满足以上条件则为0； 
#include <iostream>
using namespace std;
const int mod=1e9+7;
typedef long long LL;
const int N=1e5+10;
int n, b[N];

int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		int x;
		cin>>x;
		b[x]++;
	}
	
	if(n==1){
		if(b[1]!=0) cout<<0;
		else cout<<1;
		return 0;	
	} 
	
	if(n%2==0){
		bool is_ok=true;
		for(int i=0;i<=n-1;i++)
		{
			if(i%2==0)
			{
				if(b[i]!=0){
					is_ok=false;
					break;	
				}	
			}
			else{
				if(b[i]!=2){
					is_ok=false;
					break;	
				}
			} 
		}
		if(!is_ok) cout<<0;
		else cout<<pow(2,n/2)%mod;
	}else{
		bool is_ok=true;
		for(int i=0;i<=n-1;i++)
		{
			if(i==0){
				if(b[i]!=1){
					is_ok=false;
					break;
				}
			}
			else{
				if(i%2==0){
					if(b[i]!=2){
						is_ok=false;
						break;
					}
				}else{
					if(b[i]!=0){
						is_ok=false;
						break;
					}
				}
			}
		}
		if(!is_ok) cout<<0;
		else cout<<n-1;
	}
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:46:28: error: 'pow' was not declared in this scope
   46 |                 else cout<<pow(2,n/2)%mod;
      |                            ^~~
Language: C

import java.util.*;
import java.io.*;

 public class Main{
// taking inputs
static BufferedReader s1;
static BufferedWriter out;
static String read() throws IOException{String line="";while(line.length()==0){line=s1.readLine();continue;}return line;}
static int int_v (String s1){return Integer.parseInt(s1);}
static long long_v(String s1){return Long.parseLong(s1);}
static int[] int_arr() throws IOException{String[] a=read().split(" ");int[] b=new int[a.length];for(int i=0;i<a.length;i++){b[i]=int_v(a[i]);}return b;}
static long[] long_arr() throws IOException{String[] a=read().split(" ");long[] b=new long[a.length];for(int i=0;i<a.length;i++){b[i]=long_v(a[i]);}return b;}
static void assign(){s1=new BufferedReader(new InputStreamReader(System.in));out=new BufferedWriter(new OutputStreamWriter(System.out));}
static long Modpow(long a,long p,long m){long res=1;while(p>0){if((p&1)!=0){res=(res*a)%m;}p >>=1;a=(a*a)%m;}return res;}
static long Modmul(long a,long b,long m){return ((a%m)*(b%m))%m;}
static long ModInv(long a,long m){return Modpow(a,m-2,m);}
static long nck(int n,int r,long m){if(r>n){return 0l;}return Modmul(f[n],ModInv(Modmul(f[n-r],f[r],m),m),m);}
static long[] f;
static long mod=(long)1e9+7;
//......................................@uthor_Alx..............................................

   public static void main(String[] args) throws  IOException{
				assign();
				int t=1;//int_v(read()),cn=1;
				while(t--!=0){
					int n=int_v(read());
					int[] arr=int_arr();
					int[] f=new int[n];
					for(int i:arr){f[i]++;}
					boolean b=true;
					if((n%2==0&&f[0]>0)||f[0]>1){b=false;}
					if(n%2==0){
						for(int i=1;i<n;i+=2){
							if(f[i]!=2){
								b=false;break;
							}
						}
					}
					if(n%2==1){
						for(int i=2;i<n;i+=2){
							if(f[i]!=2){
								b=false;break;
							}
						}
					}
					if(!b){
						out.write("0");
					}
					else{
						out.write(Modpow(2l,n/2,mod)+"");
					}
					
				}
			    
			    out.flush();

	}
}

Compiler output:
main.c:1:1: error: unknown type name 'import'
    1 | import java.util.*;
      | ^~~~~~
main.c:1:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    1 | import java.util.*;
      |            ^
main.c:2:1: error: unknown type name 'import'
    2 | import java.io.*;
      | ^~~~~~
main.c:2:12: error: expected '=', ',', ';', 'asm' or '__attribute__' before '.' token
    2 | import java.io.*;
      |            ^
main.c:4:2: error: unknown type name 'public'
    4 |  public class Main{
      |  ^~~~~~
main.c:4:15: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'Main'
    4 |  public class Main{
      |               ^~~~
Language: C++

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cstring>
#include<string>
#include<cmath>
#include<vector>
#define lowbit(x) ((x)&(-x))
#define sc scanf
#define debug1(x) cout<<x<<" "
#define debug2(x) cout<<x<<"\n"
#define MAX(a,b) ((a)>(b)?(a):(b))
#define MIN(a,b) ((a)<(b)?(a):(b))
typedef long long ll;
const ll inf=1e18;
const int N=1e5+10;
ll mod=1e9+7;
using namespace std;
int gcd(int a,int  b){return b==0?a:gcd(b,a%b);}
int arr[N],brr[N];
ll quick_pow(ll a,ll b,ll m)
{
	ll ret=1;
	while(b)
	{
		if(b&1)
		{
			ret*=a;
			ret%=m;
		}
		a*=a;
		a%=m;
		b>>=1;
	}
	return ret;
}
int main()
{
	int n;
	while(cin>>n)
	{
		memset(brr,0,sizeof(brr));
		for(int i=1;i<=n;i++)
		{
			cin>>arr[i];
			brr[arr[i]]++;
		}
		long long sum=0,i;
		if(n%2==0)i=1;
		else i=0; 
		for(;i<n;i+=2)
		{
			if(brr[i]>2||brr[0]>1)
			{
				break;
			}
			sum+=brr[i];
		}
		if((sum==n))
		{
			ll ans=quick_pow(2,n/2,mod);
			cout<<ans<<"\n";
		}	
		else
		cout<<“0”<<"\n";
	}	
	return 0;
}

Compiler output:
a.cc:65:23: error: extended character “ is not valid in an identifier
   65 |                 cout<<“0”<<"\n";
      |                       ^
a.cc:65:23: error: extended character ” is not valid in an identifier
a.cc: In function 'int main()':
a.cc:65:23: error: '\U0000201c0\U0000201d' was not declared in this scope
   65 |                 cout<<“0”<<"\n";
      |                       ^~~
Language: C++

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

typedef long long int lli;
typedef long long ll;
typedef long double ld;

int main(){
    int t=1;
    //cin>>t;
    while(t--){
        int n;
        cin>>n;
        ll MOD=1e9+7;
        map<int,int> a;
        for(int i=0;i<n;i++){
            int x;
            cin>>x;
            a[x]++;
        }
        if(n%2==0){
            for(auto j: a){
                if(j.first%2==0 || j.second!=2){
                    cout<<0;
                    return 0;
                }
            }
            ll ans=1;
            for (int i=0; i<N/2; i++) {
                ans *= 2;
                ans %= MOD;
            }
        }
        else{
            for(auto j: a){
                if(j.first==0 && j.second!=1){
                    cout<<0;
                    return 0;
                }
                else{
                    if(j.first%2!=0 && j.second!=2){
                    cout<<0;
                    return 0;
                }
                }
            }
            ll ans=1;
            for (int i=0; i<N/2; i++) {
                ans *= 2;
                ans %= MOD;
            }
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:29: error: 'N' was not declared in this scope
   29 |             for (int i=0; i<N/2; i++) {
      |                             ^
a.cc:48:29: error: 'N' was not declared in this scope
   48 |             for (int i=0; i<N/2; i++) {
      |                             ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define endl "\n"
#define pb(s) push_back(s)
#define mp(a,b) make_pair(a,b)
#define f first
#define s second
#define ALL(v) v.begin(), v.end()
#define ALLA(arr, sz) arr, arr + sz
#define SORT(v) sort(ALL(v))
#define REVERSE(v) reverse(ALL(v))
#define SORTA(arr, sz) sort(ALLA(arr, sz))
#define REVERSEA(arr, sz) reverse(ALLA(arr, sz))
#define PI 3.14159265358979323846264338327950L
#define MOD 1000000007

typedef long long ll;
typedef vector<int> vi;
typedef vector<ll> vl;



void solve()
{
    int n;
    cin>>n;
    vi v(n+1);

    for(int i=1;i<=n;++i)cin>>v[i];
    sort(v.begin()+1,v.end());
    if(n%2==0){
        for(int i=1;i<n;i+=2){
            if(v[i]!=i||v[i+1]!=i||v[i]!=v[i+1]){
                cout<<0<<endl;
                return;
            }
        }
        cout<<pow(2,n/2)%MOD<<endl;
    }
    else{
        if(v[1]==0){
            for(int i=2;i<n;i+=2){
                if(v[i]!=i||v[i+1]!=i||v[i]!=v[i+1]){
                    cout<<0<<endl;
                    return;
                }
            }
            cout<<pow(2,n/2)%MOD<<endl;
        }
        else{
            cout<<0<<endl;
        }
    }
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    //int t;
    //cin>>t;
    //while(t--)
        solve();
    return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:40:25: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   40 |         cout<<pow(2,n/2)%MOD<<endl;
      |               ~~~~~~~~~~^
      |                  |
      |                  __gnu_cxx::__promote<double>::__type {aka double}
a.cc:50:29: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   50 |             cout<<pow(2,n/2)%MOD<<endl;
      |                   ~~~~~~~~~~^
      |                      |
      |                      __gnu_cxx::__promote<double>::__type {aka double}
Language: Java

import java.util.*;
import java.math.*; 

public class Main {
  
  static BigDecimal a = new BigDecimal("2");
  static BigDecimal b = new BigDecimal("2");
  static BigDecimal c = new BigDecimal("1000000007");
  
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int N= sc.nextInt();
    int check =0, total =0;
    int[] a = new int[N];
    for (int i =0; i<N; i++) {
      int b = sc.nextInt();
      if (b * N % 2 != 0 || b >= N) {
        break;
      }
      a[b]++;
      total += b;
    }
    if (total != N * N / 2) check++;
    for (int i=N-1; i>0; i -=2) {
      if (a[i] != 2) check++;
    }
    if (check != 0) {
      System.out.println(0);
    } else {
      for (int i =2; i<= N/2; i++) {
        a = a.multiply(b);
      }
      a = a.remainder(c);
      System.out.println(a);
    }
  } 
}

Compiler output:
Main.java:31: error: cannot find symbol
        a = a.multiply(b);
             ^
  symbol:   method multiply(BigDecimal)
  location: variable a of type int[]
Main.java:33: error: cannot find symbol
      a = a.remainder(c);
           ^
  symbol:   method remainder(BigDecimal)
  location: variable a of type int[]
2 errors
Language: C++

#include <iostream>
#include<cmath>
using namespace std;
int find(int arr[], int i, int num){
	for(int j=0;j<i;j++){
		if(arr[j]==num){
			return j;
		}
	}
	return -1;
}
int main() {
	int a;
	cin>>a;
	int a_len=a;
	int arr[a];
	for(int i=0;i<a;i++){
		cin>>arr[i];
	}
	bool fail=false;
	if(a%2==1){
		int j=find(arr,a,0);
		if(j==-1){
			fail=true;
		}
		else{
			arr[j]=-1;
		}
		a_len--;
	}
	int rpNum=1+a%2;
	int i=0;
	while(i<a_len&&!fail){
		int j1=find(arr,a,rpNum);
		if(j1==-1){
			//cout<<"FAILED"<<endl;
			fail=true;
		}
		else{
			arr[j1]=-1;
		}
		int j2=find(arr,a,rpNum);
		//cout<<"Finding: "<<rpNum<<" Round:"<<i/2<<endl;
		if(j1==-1){
			//cout<<"FAILED"<<endl;
			fail=true;
		}
		else{
			arr[j2]=-1;
			//cout<<j1<<" and "<<j2<<" are -1"<<endl;
			i+=2;
			rpNum+=2;
		}
	}
	
	for(int i=0;i<a;i++){
		if(arr[i]!=-1){
			//cout<<"FAIL AT "<<i<<". Number is "<<arr[i]<<endl;
			fail=true;
			break;
		}
	}
	if(fail){
		cout<<0<<endl;
	}
	else{
		cout<<pow(2.0,a_len/2)%pow(10.0,9.0)+7<<endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:67:39: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'double' to binary 'operator%'
   67 |                 cout<<pow(2.0,a_len/2)%pow(10.0,9.0)+7<<endl;
      |                       ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~
      |                          |                |
      |                          |                double
      |                          __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include <iostream>
#include<algorithm>
using namespace std;
const int P=1000000007;
int main() {
  int n;
  cin>>n;
  
  int arr[n];
  for(int i=0;i<n;i++){
  	cin>>arr[i];
  }
  sort(arr,arr+n);
  if(n%2==0){
  	int x=1;
  	for(int i=0;i<n;i+=2){
  	  if(arr[i]==i+1 and arr[i+1]==i+1){
  	  	x*=2;
  	  	x%=P;
  	  }else{
  	  	x=0;
  	  	break;
  	  }
  	}
  	cout<<x<<endl;
  }else{
  	int x=1;
  	if(arr[0]!=0){
  	  cout<<0<<endl;
  	}else{
	  	for(int i=1;i<n;i+=2){
	  	  if(arr[i]==i+1 and arr[i+1]==i+1){
	  	  	x*=2;
	  	  	x%=P;
	  	  }else{
	  	  	x=0;
	  	  	break;
	  	  }
	  	}
	  	cout<<x<<endl;  		
  	}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:10: error: expected '}' at end of input
   41 |         }
      |          ^
a.cc:26:8: note: to match this '{'
   26 |   }else{
      |        ^
a.cc:41:10: error: expected '}' at end of input
   41 |         }
      |          ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
#define mod ll(1e9+7)

ll power(ll x){
	ll temp=1;
	for(ll i=0;i<x;i++){
		temp=((temp%mod)*(2%mod))%mod;
	}
	return temp;
}

int main()
{
    ll i,n,a[1000000],status=0,temp=0,cou=0,ans;
    cin>>n;
    for(i=0;i<n;i++)
    {
        cin>>a[i];
    }
    if(n==1&&a[0]=0)
    {
      cout<<1;
      return 0;
    }
    sort(a,a+n);
    if(n%2==0)
    {
        status=0;
    }
    else
    {
        status=1;
    }
    if(status==0)
    {
        if(a[0]==0)
        {
            cout<<0;
            return 0;
        }
        for(i=0;i<n;i++)
        {
            if(a[i]==a[i+1])
            {
                temp++;
                if(temp==1)
                {
                    cou++;
                }
            }
            else
            {
                temp=0;
            }
            if(temp>1)
            {
                cout<<0;
                return 0;
            }

        }
    }
    if(status==1)
    {
        if(a[0]!=0)
        {
          cout<<0;
          return 0;
        }
        if(a[0]==a[1])
        {
            cout<<0;
            return 0;
        }
        for(i=1;i<n;i++)
        {
            if(a[i]==a[i+1])
            {
                temp++;
                if(temp==1)
                {
                    cou++;
                }
            }
            else
            {
                temp=0;
            }
            if(temp>1)
            {
                cout<<0;
                return 0;
            }

        }
    }
    if(cou!=n/2)
    {
      cout<<0;
      return 0;
    }
    cou=power(cou);
    cout<<(cou)%mod;
    return 0;
}



// #include<bits/stdc++.h>
// using namespace std;
// typedef long long int ll;
// #define mod ll(1e9+7)
// void solve(){
// 	ll n;
// 	cin>>n;
// 	vector<ll> arr(n);
// 	vector<ll> freq(n);
// 	ll prod=1;
// 	for( ll&x:arr)cin>>x,freq[x]++;
// 	if(freq[0]>=2){cout<<0<<endl;return;}
// 	if(n%2==0 and freq[0]>0){cout<<0<<endl;return;}
// 	for(ll i=0;i<freq.size();i++){
// 		if(freq[i]>2){
// 			cout<<0;return;
// 		}
// 		if(freq[i])
// 		prod=(prod%mod*(freq[i]%mod))%ll(1e9+7);
// 	}
// 	cout<<prod<<endl;

// }


// int main(){
// 	solve();
// }


Compiler output:
a.cc: In function 'int main()':
a.cc:22:12: error: lvalue required as left operand of assignment
   22 |     if(n==1&&a[0]=0)
      |        ~~~~^~~~~~
Language: C++


#include<bits/stdc++.h>
using namespace std;
typedef long long int ll;
int main()
{
    ll i,n,a[1000000],status=0,temp=0,cou=0;
    cin>>n;
    for(i=0;i<n;i++)
    {
        cin>>a[i];
    }
    sort(a,a+n);
    if(n%2==0)
    {
        status=0;
    }
    else
    {
        status=1;
    }
    if(status==0)
    {
        if(a[0]==0)
        {
            cout<<1;
            return 0;
        }
        for(i=0;i<n;i++)
        {
            if(a[i]==a[i+1])
            {
                temp++;
                if(temp==1)
                {
                    cou++;
                }
            }
            else
            {
                temp=0;
            }
            if(temp>1)
            {
                cout<<1;
                return 0;
            }

        }
    }
    if(status==1)
    {
        if(a[0]==a[1])
        {
            cout<<0;
            return 0;
        }
        for(i=1;i<n;i++)
        {
            if(a[i]==a[i+1])
            {
                temp++;
                if(temp==1)
                {
                    cou++;
                }
            }
            else
            {
                temp=0;
            }
            if(temp>1)
            {
                cout<<1;
                return 0;
            }

        }
    }
    cout<<(cou*2)%(pow(10,9)+7);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:80:18: error: invalid operands of types 'll' {aka 'long long int'} and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   80 |     cout<<(cou*2)%(pow(10,9)+7);
      |           ~~~~~~~^~~~~~~~~~~~~~
      |               |             |
      |               |             __gnu_cxx::__promote<double>::__type {aka double}
      |               ll {aka long long int}
Language: C++

using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int, int> pii;
typedef vector<int> vi;
struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
 
const int MAXN = 100100;
const int MOD = 1e9+7;
int cnt[MAXN];
 
int solve(int N) {
	ll ans = 1;
	if (N % 2 == 1) {
		if (cnt[0] != 1) return 0;
		for (int i = 2; i < N; i += 2) {
			if (cnt[i] != 2) return 0;
			(ans *= 2) %= MOD;
		}
		return ans;
	} else {
		for (int i = 1; i < N; i+=2) {
			if (cnt[i] != 2) return 0;
			(ans *= 2) %= MOD;
		}
		return ans;
	}
}
 
int main() {
	int N;
	cin >> N;
	for (int i = 0; i < N; i++) {
		int a;
		cin >> a;
		cnt[a]++;
	}
	cout << solve(N) << endl;
	return 0;
}

Compiler output:
a.cc:4:9: error: 'pair' does not name a type
    4 | typedef pair<int, int> pii;
      |         ^~~~
a.cc:5:9: error: 'vector' does not name a type
    5 | typedef vector<int> vi;
      |         ^~~~~~
a.cc: In constructor 'cww::cww()':
a.cc:6:18: error: 'ios' has not been declared
    6 | struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
      |                  ^~~
a.cc:6:46: error: 'cin' was not declared in this scope
    6 | struct cww{cww(){ios::sync_with_stdio(false);cin.tie(0);}}star;
      |                                              ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc: In function 'int main()':
a.cc:32:9: error: 'cin' was not declared in this scope
   32 |         cin >> N;
      |         ^~~
a.cc:32:9: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:38:9: error: 'cout' was not declared in this scope
   38 |         cout << solve(N) << endl;
      |         ^~~~
a.cc:38:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:38:29: error: 'endl' was not declared in this scope
   38 |         cout << solve(N) << endl;
      |                             ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll ;
#define rep(i,n) for(int i = 0 ; i < n ;i++)

int end(){
    cout << 0 << endl;
    return 0 ;
}

ll const mod = 1e9+7 ;

int main(){
    int n ;
    cin >> n ;
    ll ans = 1 ;
    map<int,int> mp ;
    rep(i,n){
        int a ;
        cin >> a ;
        mp[a]++ ;
    }
    if(n%2 == 1){
        if(mp[0]!=1){ end(); return 0 ;}
        rep(i,n/2) if(mp[2*(i+1)]!=2){ end(); return 0 ;}
        rep(i,n/2){
            ans = 2*ans%mod ;
        }
        cout << ans << endl;
    }
        if(n%2 == 0){
        if(mp[0]!=0){ end(); return 0 ;}
        rep(i,n/2){
            //if(mp[2*(i+1)]!=0) 
            if(mp[2*i+1]!=2){ end(); return 0 ;}
        rep(i,n/2){
            ans = 2*ans%mod ;
        }
        cout << ans << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:2: error: expected '}' at end of input
   41 | }
      |  ^
a.cc:13:11: note: to match this '{'
   13 | int main(){
      |           ^
Language: C++

#ifdef DEBUG

#else

#    pragma GCC optimize("O3,no-stack-protector")
#    pragma GCC optimize("unroll-loops")

#    if __cplusplus < 201703L
#        pragma GCC target("avx")
#    else
#        pragma GCC target("avx2")
#    endif

#endif
// 実数の場合
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define dump(x) cout << x << endl
typedef int64_t Int;
typedef long double Ld;

using namespace std;
using Graph = vector<vector<Int>>;

const double pi = M_PI;
const Int MOD = 1000000007;

// 二分累乗法
template <typename T>
T modpow(T a, T n, T mod) {
    T ret = 1;

    if (mod == 1) {
        while (n > 0) {
            if (n & 1) {
                ret = ret * a;
            }
            a = a * a;
            n >>= 1;
        }
    } else {
        while (n > 0) {
            if (n & 1) {
                ret = ret * a % mod;
            }
            a = a * a % mod;
            n >>= 1;
        }
    }

    return ret;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    Int n;
    cin >> n;
    map<Int, Int> m;
    for (Int i = 0; i < n; i++) {
        Int in;
        cin >> in;
        if (!m.insert({in, 1}).second) {
            m[in]++;
        }
    }

    bool isok = true;
    Int ans = 0;
    if (n % 2 == 1) {
        if (m.count(0) == 0) {
            isok = false;
        } else {
            if (m[0] != 1) {
                isok = false;
            }
        }

        n--;
        for (Int i = 2; i <= n; i += 2) {
            if (m.count(i) == 0) {
                isok = false;
                break;
            } else {
                if (m[i] != 2) {
                    isok = false;
                    break;
                }
            }
        }

    } else {
        if (m.count(0) == 1) {
            isok = false;
        }

        n--;
        for (Int i = 1; i <= n; i += 2) {
            if (m.count(i) == 0) {
                isok = false;
                break;
            } else {
                if (m[i] != 2) {
                    isok = false;
                    break;
                }
            }
        }
    }

    n++;
    if (isok) {
        ans = modpow(2LL, (n / 2LL), MOD);
    } else {
        ans = 0;
    }

    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:116:21: error: no matching function for call to 'modpow(long long int, long long int, const Int&)'
  116 |         ans = modpow(2LL, (n / 2LL), MOD);
      |               ~~~~~~^~~~~~~~~~~~~~~~~~~~~
a.cc:32:3: note: candidate: 'template<class T> T modpow(T, T, T)'
   32 | T modpow(T a, T n, T mod) {
      |   ^~~~~~
a.cc:32:3: note:   template argument deduction/substitution failed:
a.cc:116:21: note:   deduced conflicting types for parameter 'T' ('long long int' and 'long int')
  116 |         ans = modpow(2LL, (n / 2LL), MOD);
      |               ~~~~~~^~~~~~~~~~~~~~~~~~~~~
Language: C++

#ifdef DEBUG

#else

#    pragma GCC optimize("O3,no-stack-protector")
#    pragma GCC optimize("unroll-loops")

#    if __cplusplus < 201703L
#        pragma GCC target("avx")
#    else
#        pragma GCC target("avx2")
#    endif

#endif
// 実数の場合
// #pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")

#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
#define dump(x) cout << x << endl
typedef int64_t Int;
typedef long double Ld;

using namespace std;
using Graph = vector<vector<Int>>;

const double pi = M_PI;
const Int MOD = 1000000007;

// 二分累乗法
template <typename T>
T modpow(T a, T n, T mod) {
    T ret = 1;

    if (mod == 1) {
        while (n > 0) {
            if (n & 1) {
                ret = ret * a;
            }
            a = a * a;
            n >>= 1;
        }
    } else {
        while (n > 0) {
            if (n & 1) {
                ret = ret * a % mod;
            }
            a = a * a % mod;
            n >>= 1;
        }
    }

    return ret;
}

int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    Int n;
    cin >> n;
    map<Int, Int> m;
    for (Int i = 0; i < n; i++) {
        Int in;
        cin >> in;
        if (!m.insert({in, 1}).second) {
            m[in]++;
        }
    }

    bool isok = true;
    Int ans = 0;
    if (n % 2 == 1) {
        if (m.count(0) == 0) {
            isok = false;
        } else {
            if (m[0] != 1) {
                isok = false;
            }
        }

        n--;
        for (Int i = 2; i <= n; i += 2) {
            if (m.count(i) == 0) {
                isok = false;
                break;
            } else {
                if (m[i] != 2) {
                    isok = false;
                    break;
                }
            }
        }

    } else {
        if (m.count(0) == 1) {
            isok = false;
        }

        n--;
        for (Int i = 1; i <= n; i += 2) {
            if (m.count(i) == 0) {
                isok = false;
                break;
            } else {
                if (m[i] != 2) {
                    isok = false;
                    break;
                }
            }
        }
    }

    n++;
    if (isok) {
        ans = modpow(2, (n / 2), MOD);
    } else {
        ans = 0;
    }

    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:116:21: error: no matching function for call to 'modpow(int, Int, const Int&)'
  116 |         ans = modpow(2, (n / 2), MOD);
      |               ~~~~~~^~~~~~~~~~~~~~~~~
a.cc:32:3: note: candidate: 'template<class T> T modpow(T, T, T)'
   32 | T modpow(T a, T n, T mod) {
      |   ^~~~~~
a.cc:32:3: note:   template argument deduction/substitution failed:
a.cc:116:21: note:   deduced conflicting types for parameter 'T' ('int' and 'long int')
  116 |         ans = modpow(2, (n / 2), MOD);
      |               ~~~~~~^~~~~~~~~~~~~~~~~
Language: C++

#include <iostream>
#include <sstream>  // istringstream
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>

using namespace std;

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

    // 記録
    int memo[100000+10] = {0};
    for(int i=0; i<N; ++i){
        memo[A[i]]++;
    }

    bool flag = true;
    if(N%2 != 0){ // 奇数人の場合
        if(memo[0] != 1){ // 0が必ず一人いる
            flag = false;
        }
        for(int i=2; i<N; i+=2){
            if(memo[i] != 2){ // 各偶数が2人ずつ
                flag = false;
            }
        }
    }
    else{ // 偶数人の場合
        for(int i=1; i<N/2; i+=2){
            if(memo[i] != 2){ // 各奇数が2人ずつ
                flag = false;
            }
        }
    }

    long long ans = pow(2, N/2) % (1000000000+7);
    if(!flag) ans = 0;    
    // cout << pow(2, 10) << endl;
    // cout << pow(2, 100) << endl;
    // cout << pow(2, 1000) << endl;

    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:33: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   42 |     long long ans = pow(2, N/2) % (1000000000+7);
      |                     ~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~
      |                        |                     |
      |                        |                     int
      |                        __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define mod 1e9+7

ll i,j,k,l;

ll mypow(ll a,ll b){
    ll num=1;
    while(b!=0){
        num*=a;
        num%=mod;
        b--;
    }
    return num;
}

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

    ll ans=0;
    sort(a.begin(),a.end());
    if(n%2==1){
        if(a[0]!=0){cout<<0<<endl;return 0;}
        for(i=1;i<n-1;i+=2){
            if(a[i+1]!=a[i]){cout<<0<<endl;return 0;}
        }
        for(i=1;i<n-2;i+=2){
            if(a[i+2]!=a[i]+2){cout<<0<<endl;return 0;}
        }

        ans=(a[n-1])/2;
    }else{
        for(i=0;i<n-1;i+=2){
            if(a[i+1]!=a[i]){cout<<0<<endl;return 0;}
        }
        for(i=0;i<n-2;i+=2){
            if(a[i+2]!=a[i]+2){cout<<0<<endl;return 0;}
        }

        ans=(a[n-1]+1)/2;
    }

    cout<<mypow(2,ans)<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'long long int mypow(long long int, long long int)':
a.cc:12:12: error: invalid operands of types 'long long int' and 'double' to binary 'operator%'
   12 |         num%=mod;
      |            ^
a.cc:12:12: note:   in evaluation of 'operator%=(long long int, double)'
Language: C++

#include <bits/stdc++.h>
#define ll long long
using namespace std;
inline int D()
{
	int t;
	scanf("%d",&t);
	return t;
}
inline ll llD(){
	ll t;
	scanf("%lld",&t);
	return t;
}
const int N=2e5+9;

int arr[N];
   ll mod=1e9+7,sum=0;
int main(){
   int  n =D();
   int k=2;
   int T=0;
    if(n==1)
        return cout<<1,0;
bool r=0;
   for(int i=1; (i<=n) ;i++)
    {

        int a=D();
        if(!arr[a])
           arr[a]++, sum++;
        else arr[a]++;
        if(arr[a]>2)
            r=1;
            if((n&1) && (a&1))
                r=1;
            if((n%2==0) && (a%2==0))
                r=1;
    }

    if(r)   return printf("0"),0;
    if(sum==1)
        return puts("2"),0;
    if((n/2 != sum)
    return printf("0"),0;
if(n&1)
    sum--;
    printf("%d",(sum*sum)%mod);
    }

/**
bool ok(int val){
  int cntm=0,cntp=0;
  for(int i=0;i<n-val;i++)
  {
      cntm=0;cntp=0;
      for(int j=i;j<val;j++)
      {
      (arr[j]==1)?cntp++:cntm++;
      }
      if(cntp==cntm)
        break;
  }
  return cntp==cntm;
}
int binarySearch(){
  int low = 0, med, hi =n;
  while(low<hi){
    med = (low+hi+1)>>1;
    cout<<med<<" "<<hi<<" "<<low<<endl;
    if(ok(med))  low = med;
    else  hi = med-1;
  }
  return low;
}*/



/**
  int power1(int b, int p){               //O(p)
    if(!p)  return 1;
    return b*power1(b, p-1);
  }
  int power2(int b, int p){               //O(Log(p))
    if(!p)  return 1;
    int ret = power2(b, p/2);
    return (p&1 ? ret*ret*b : ret*ret);
  }
   int mul(int a, int b, int m){
      return (a%m * b%m) % m;
  }

*/


/**
void seive()
{
    bitset<N>iscomp;
    iscomp[0]=iscomp[1]=1;
    for(long long i=2; i<=N; ++i)
    {
        if(!iscomp[i])
        {
            a.push_back(i);
            for(long long j=i*i; j<=N; j+=i)
                iscomp[j]=1;
        }
    }
}
3
abc
abc
*/

    /**


    */


Compiler output:
a.cc: In function 'int main()':
a.cc:44:20: error: expected ';' before 'return'
   44 |     if((n/2 != sum)
      |                    ^
      |                    ;
   45 |     return printf("0"),0;
      |     ~~~~~~          
a.cc:46:1: error: expected primary-expression before 'if'
   46 | if(n&1)
      | ^~
a.cc:45:26: error: expected ')' before 'if'
   45 |     return printf("0"),0;
      |                          ^
      |                          )
   46 | if(n&1)
      | ~~                        
a.cc:44:7: note: to match this '('
   44 |     if((n/2 != sum)
      |       ^
Language: C++

#include  <bits/stdc++.h>
using namespace std;
static int fast_io = []() { std::ios::sync_with_stdio(false); cin.tie(nullptr); return 0; }();
int main(){
  long long int mod=1e9+7;
  long long int n;
  cin>>n;
  vector<long long int> nums(100005);
  long long int ans=1;
  long long int flag=1;
  if(n%2==0){
    for(long long int i=0;i<n;i++){
      long long int x;
      cin>>x;
      nums[x]++;
      if(x>=2 || x%2==0 || nums[x]>2){
        flag=0;
        cout<<0<<"\n";
        break;  
      }
      
      if(nums[x]==1){
        ans = ans*2%mod;
      }
    }
  }
  else{
    for(long long int i = 0;i<n;i++){
      long long int x;
      cin>>x;
      nums[x]++;
      if(x>=n || x%2==1 || nums[0]>1 || nums[x]>2){
        flag=0;
        cout<<0<<"\n";
        break;  
      }
      if(x!=0 && nums[x]==1){
        ans=ans*2%mod;
      }
    }
  }
  if(posible)
    cout<<ans<<"\n";  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:42:6: error: 'posible' was not declared in this scope
   42 |   if(posible)
      |      ^~~~~~~
Language: C++

#include <iostream>
#include <vector>
#include <set>
#include <cmath>
using namespace std;

bool is_possible(vector<int> row){
	vector<int> numbers(row.size(),0);
	//for (int i: numbers) printf("%d",i);
	for (int i: row){
		if (numbers[i/2] == 0) numbers[i/2]+=1;
		else if (numbers[i/2] == 1 && i != 0) numbers[i/2]+=1;
		else if (numbers[i/2] == 2) return false;
		else return false;

	}
	
	return true;
}
int main(){
    
    int n;
    scanf("%d",&n);
	vector<int> row(n);
	for (int&k : row){
		scanf("%d",&k);
	}
	if (is_possible(row)){
		int result = pow(2,n/2);
		printf("\n%d",result%(pow(10,9)+5));
	}
	else printf("\n%d",0);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:37: error: invalid operands of types 'int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   30 |                 printf("\n%d",result%(pow(10,9)+5));
      |                               ~~~~~~^~~~~~~~~~~~~~
      |                               |                |
      |                               int              __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

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

using namespace std;

#define ll long long int
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
using vi = vector<int>;
const int MOD = 1e9 + 7;


int main() {
    int N;
    cin >> N;
    int a = 1;
    vi A(N);
    vi even(N);
    vi odd(N);
    rep(i, N) {
        cin >> A[i];
    }
    sort(all(A));

    rep(i, N / 2) {
        even[2 * i] = 2 * i + 1;
        even[2 * i + 1] = 2 * i + 1;
    }

    odd[0] = 0;
    rep(i, (N-1) / 2) {
        odd[2 * i + 2] = 2 * i + 2;
        odd[2 * i + 1] = 2 * i + 2;
    }
    if (N % 2 == 0) {
        if (A != even) a = 0;
    }
    else {
        if (A != odd) a = 0;
    }
    ll ans = 0;
    if (a == 1) ans = pow(2, N / 2);
    cout << ans % MOD << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:23: error: 'pow' was not declared in this scope
   44 |     if (a == 1) ans = pow(2, N / 2);
      |                       ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long int
#define rep(i, n) for(int i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
using vi = vector<int>;
const int MOD = 1e9+7;


int main() {


int main() {
    int N;
    cin >> N;
    int a = 1;
    vi A(N);
    rep(i, N) {
        cin >> A[i];
    }
    sort(all(A));
    if (N % 2 == 0) {
        rep(i, N / 2) {
            if (A[2 * i] != A[2 * i + 1] || A[2 * i] != 2 * i + 1 || A[2 * i + 1] != 2 * i + 1)
                a = 0;
        }
    }
    else {
        if (A[0] != 0) a = 0;
        rep(i, (N - 1) / 2) {
            if (A[2 * i + 1] != A[2 * i + 2] || A[2 * i + 1] != (2 * i + 2) ) a = 0;
        }
    }
    ll ans = 0;
    if (a == 1) ans = pow(2, N / 2);
    cout << ans % MOD << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   14 | int main() {
      |         ^~
a.cc:14:9: note: remove parentheses to default-initialize a variable
   14 | int main() {
      |         ^~
      |         --
a.cc:14:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:14:12: error: a function-definition is not allowed here before '{' token
   14 | int main() {
      |            ^
a.cc:38:2: error: expected '}' at end of input
   38 | }
      |  ^
a.cc:11:12: note: to match this '{'
   11 | int main() {
      |            ^
Language: C++

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


#define ll long long int
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define all(x) (x).begin(),(x).end()
using vi = vector<int>;
const int MOD = 1e9 + 7;


int main() {
    int N;
    cin >> N;
    bool a = true;
    vi A(N);
    rep(i, N) {
        cin >> A[i];
    }
    sort(all(A));
    if (N % 2 == 0) {
        for (int i = 0; i < N / 2;i++) {
            if (A[2*i] != A[2*i + 1] || A[2*i] != 2*i - 1)
                a = false;
        }
    }
    else {
        if (A[0] != 0) a = false;
        rep(i, (N - 1) / 2) {
            if (!A[2*i + 1] != A[2*i + 2] || A[2*i + 1] != 2*i + 2) a = false;
        }
    }
    ll ans = 0;
    if (a == true) ans = pow(2, N / 2);
    cout << ans % MOD << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:36:31: error: expected '}' at end of input
   36 |     cout << ans % MOD << endl;
      |                               ^
a.cc:13:12: note: to match this '{'
   13 | int main() {
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
int N;
  cin>>N;
  vector<int>A(N);
  for(int i=0;i<N;i++)
    cin>>A.at(i);
  sort(A.begin(),A.end());
  bool x=true;
  for(int i=0;i<N;i++){
  if(N%2==0){
   if(A.at(i)!=2*((N/2))+1){x=false; break;}
  }else{
  if(A.at(i)!=2*((N+1)/2)){x=false; break;}
  }
  
 }if(!x)
    cout<<0<<endl;
  else{
  int ans=1;
    fo(int i=0;i<(N/2);i++){
    ans=(ans*2)%1000000007;
    }cout<<ans<<endl;
  
  
  
  }
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:8: error: expected primary-expression before 'int'
   22 |     fo(int i=0;i<(N/2);i++){
      |        ^~~
a.cc:22:16: error: 'i' was not declared in this scope
   22 |     fo(int i=0;i<(N/2);i++){
      |                ^
Language: C++

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

int main(){
    int N;
    cin >> N;
    vector<int> A(N);
    for (int i = 0; i < N; i++){
        cin >> A.at(i);
    }
    sort(A.begin(), A.end());
    
    int y = N % 2;
    bool can = true;
    if (y == 0){
        for (int i = 0; i < N; i += 2){
            if (A.at(i) != i + 1){
                can = false;
                break;
            }
            if (A.at(i + 1) != i + 1){
                can = false;
                break;
            }
        }
    }
    else{
        if (A.at(0) != 0) can = false;
        for (int i = 1; i < N; i += 2){
            if (A.at(i) != i + 1){
                can = false;
                break;
            }
            if (A.at(i + 1) != i + 1){
                can = false;
                break;
            }
        }
    }
    double x = pow(2, N/2);
    x %= 10000000007;
    if (can) cout << x << endl;
    else cout << 0 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:41:7: error: invalid operands of types 'double' and 'long int' to binary 'operator%'
   41 |     x %= 10000000007;
      |     ~~^~~~~~~~~~~~~~
a.cc:41:7: note:   in evaluation of 'operator%=(double, long int)'