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

#include <algorithm>
#include <bitset>
#include <cstdio>
#include <functional>
#include <initializer_list>
#include <iostream>
#include <limits.h>
#include <list>
#include <map>
#include <math.h>
#include <queue>
#include <regex>
#include <set>
#include <sstream>
#include <string>
#include <tuple>
#include <utility>
#include <vector>
using namespace std;
#define ull unsigned long long
#define ll long long
#define rep(i, a, n) for (int i = (a); i < (int)(n); i++)
#define repc(i, a, n) for (int i = (a); i <= (int)(n); i++)
#define all(t) t.begin(), t.end()
#define rall(t) t.rbegin(), t.rend()
#define mat(type, row, col, init)                                              \
  vector<vector<type>>(row, vector<type>(col, init));
#define Yes(cond) cout << (cond ? "Yes" : "No") << endl;
#define YES(cond) cout << (cond ? "YES" : "NO") << endl;
#define DBG(str) cerr << (str) << endl;
ll modpow(ll n, ll p, ll M) {
  ll ans = n;
  rep(i, 0, p - 1) { ans = (ans * n) % M; }
  return ans;
}

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  map<int, int> m;
  rep(i, 0, n) {
    cin >> a[i];
    m[a[i]]++;
  }
  bool valid = true;
  if (i % 2 == = 0) {
    rep(i, 0, n / 2) {
      int k = 2 * i + 1;
      if (m[k] != 2) {
        valid = 0;
        break;
      }
    }
  } else {
    rep(i, 0, n / 2) {
      int k = 2 * i + 2;
      if (m[k] != 2) {
        valid = 0;
        break;
      }
    }
    if (m[0] != 1)
      valid = 0;
  }

  sort(all(a));

  if (valid) {
    rep(i, 0, n) cin >> a[i];
    ll M = 1e9 + 7;
    cout << modpow(2, n / 2, M) << endl;
  } else
    cout << 0 << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:7: error: 'i' was not declared in this scope
   47 |   if (i % 2 == = 0) {
      |       ^
a.cc:47:16: error: expected primary-expression before '=' token
   47 |   if (i % 2 == = 0) {
      |                ^
Language: C

#include<stdio.h>

int main(){
		int n;
		scanf("%d",&n);
		int a[n/2+!],i,j;
		long ans=1,tmp=0;
		for(i=0;i<n/2+1;i++)a[i]=0;
		if(n%2==0)a[n/2]=2;
		for(i=0;i<n;i++){
				scanf("%d",&tmp);
				a[tmp/2]++;
		}
		for(i=0;i<n/2+1;i++){
				if(n%2==0){
						if(a[i]!=2){
								puts("0");
								return 0;
						}
				}
				else{
						if(i!=0&&a[i]!=2){
								puts("0");
								return 0;
						}
				}
		}
		
		for(i=0;i<n/2;i++)ans=(ans*2)%(1000000007);
		printf("%ld\n",ans);
		return 0;
}


Compiler output:
main.c: In function 'main':
main.c:6:28: error: expected expression before ']' token
    6 |                 int a[n/2+!],i,j;
      |                            ^
Language: C

#include<stdio.h>

int main(){
		int n;
		scanf("%d",&n);
		int a[n],i,j;
		long ans=1;
		for(i=0;i<n;i++)scanf("%d",&a[i]);
		for(i=0;i<n;i++){
				for(j=0;j<n;j++){
						if(a[i]<a[j]){
								int tmp=a[i];
								a[i]=a[j];
								a[j]=tmp;
						}
				
				}
		}
		if(n%2==1){
				int tmp=a[0];
				if(a[0]!=0||a[0]==a[1]){
						puts("0");
						return 0;
				}
		}
		if(n%2==0){
				int tmp=a[0];
				if(a[0]!=1||a[0]!=a[1]){
						puts("0");
						return 0;
				}
		}
  	for(i=2;i<n;i+=2){
						if(tmp!=a[i]-2){
								puts("0");
								return 0;
						}
						tmp=a[i];
				}
		for(i=0;i<n/2;i++)ans=(ans*2)%(1000000007);
		printf("%ld\n",ans);
		return 0;
}


Compiler output:
main.c: In function 'main':
main.c:34:52: error: 'tmp' undeclared (first use in this function)
   34 |                                                 if(tmp!=a[i]-2){
      |                                                    ^~~
main.c:34:52: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>

int main(){
		int n;
		scanf("%d",&n);
		int a[n],i,j;
		long ans=1;
		for(i=0;i<n;i++)scanf("%d",&a[i]);
		for(i=0;i<n;i++){
				for(j=0;j<n;j++){
						if(a[i]<a[j]){
								int tmp=a[i];
								a[i]=a[j];
								a[j]=tmp;
						}
				
				}
		}
		if(n%2==1){
				int tmp=a[0];
				for(i=2;i<n;i+=2){
						if(tmp!=tmp[i]-2){
								puts("0");
								return 0;
						}
						tmp=a[i];
				}
				if(a[0]!=0||a[0]==a[1]){
						puts("0");
						return 0;
				}
		}
		if(n%2==0){
				int tmp=a[0];
				for(i=2;i<n;i+=2){
						if(tmp!=tmp[i]-2){
								puts("0");
								return 0;
						}
						tmp=a[i];
				}
				if(a[0]!=1||a[0]!=a[1]){
						puts("0");
						return 0;
				}
		}
		for(i=0;i<n/2;i++)ans=ans*2;
		printf("%ld\n",ans%(10*10*10*10*10*10*10*10*10+7));
		return 0;
}


Compiler output:
main.c: In function 'main':
main.c:22:60: error: subscripted value is neither array nor pointer nor vector
   22 |                                                 if(tmp!=tmp[i]-2){
      |                                                            ^
main.c:36:60: error: subscripted value is neither array nor pointer nor vector
   36 |                                                 if(tmp!=tmp[i]-2){
      |                                                            ^
Language: C++

#include <string.h>
#include <iostream>
#include <math.h>
using namespace std;
int main() {
cout<<(int)pow(2, N / 2) % 1000000007<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:19: error: 'N' was not declared in this scope
    6 | cout<<(int)pow(2, N / 2) % 1000000007<<endl;
      |                   ^
Language: C++

#include <iostream>
#include <vector>
#include <cmath>

using namespace std;

int main(){
    long long N;
    cin >> N;
    bool odd;
    if(N % 2) odd = true;
    else odd = false;
    vector<int> A(N), cnt(n);
    for(int i = 0; i < N; i++){
        cin >> A[i];
        cnt[A[i]]++;
    }
    bool exist_ans = true;
    if(odd){
        for(int i = 0; i < N; i += 2){
            if(i == 0 && cnt[i] != 1 )
                exist_ans = false;
            else{
                if(cnt[i] != 2) exist_ans = false;
            }
        }
    }
    else{
        for(int i = 1; i < N; i += 2){
            if(cnt[i] != 2) exist_ans = false;
        }
    }
    if(exist_ans) cout << static_cast<long long>(pow(2, N/2)) % static_cast<long long>((pow(10, 9) + 7)) << endl;
    else cout << 0 << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:27: error: 'n' was not declared in this scope
   13 |     vector<int> A(N), cnt(n);
      |                           ^
Language: C++

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

int n,a[500000],t[500000],tag,an;

int main(){
    cin>>n;
    for(int i=0;i<n;i++){
        cin>>a[i];
        t[a[i]]++;
    }
    for(int i=1;i<n+5;i++){
        if(t[i]%2==1)tag=1;
    }
    if(tag==0){
        for(int i=1;i<n+5;i++){
            if(t[i]>0)an++;
        }
        cout<<pow(2,an)%1000000007<<endl;
    }else{
        cout<<0<<endl;
    }



}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:24: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   19 |         cout<<pow(2,an)%1000000007<<endl;
      |               ~~~~~~~~~^~~~~~~~~~~
      |                  |      |
      |                  |      int
      |                  __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n, a[100005];
bool flag;
int main()
{
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> a[i];
  }
  sort(a, a + n);
  if(n % 2){
    if(a[0] == 0){
      ans = 1;
    }
  }
  else{
    if(a[0] == a[1]){
      ans = 2;
    }
  }
  int j = 1;
  for(int i = (n % 2 ? 2 : 3); i < n; i += 2){
    if(a[i] == a[i - 1] && i == j){
      ans *= 2;
      j++;
    }
    else flag = true;
  }
  if(flag)cout << 0 << endl;
  else cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   14 |       ans = 1;
      |       ^~~
      |       abs
a.cc:19:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   19 |       ans = 2;
      |       ^~~
      |       abs
a.cc:25:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   25 |       ans *= 2;
      |       ^~~
      |       abs
a.cc:31:16: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |   else cout << ans << endl;
      |                ^~~
      |                abs
Language: C++

#include <iostream>
#include <algorithm>
#include <set>
#include <map>
#include <string>

using namespace std;
typedef long long ll;
#define rep(i,s,n)for(ll i = s;i<n;i++)
#define repe(i,s,n)for(ll i = s;i<=n;i++)

ll a[100001] = {};
ll b[100001] = {};

int main() {
	ll N; cin >> N;
	repe(i, 1, N) {
		cin >> a[i];
		b[a[i]]++;
	}

	if (N % 2 == 1) {
		repe(i, 1, N) {
			if (i == 0 && b[i] != 1) {
				cout << 0 << endl;
				return 0;
			}
			else if (i % 2 == 0 && b[i] != 2) {
				cout << 0 << endl;
				return 0;
			}
			else if (i % 2 == 1 && b[i] != 0) {
				cout << 0 << endl;
				return 0;
			}
		}
	}
	else {
		repe(i, 1, N) {
			if (i % 2 == 1 && b[i] != 2) {
				cout << 0 << endl;
				return 0;
			}
			else if (i % 2 == 0 && b[i] != 0) {
				cout << 0 << endl;
				return 0;
			}
		}
	}

	cout << pow(2, N / 2);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:51:17: error: 'pow' was not declared in this scope
   51 |         cout << pow(2, N / 2);
      |                 ^~~
Language: C++

#include<iostream>
#include<math.h>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:28:19: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   28 |   cout<<pow(2,n/2)%1000000007<<endl;
      |         ~~~~~~~~~~^~~~~~~~~~~
      |            |       |
      |            |       int
      |            __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include<iostream>
using namespace std;

int main(){
	int n;
	cin>>n;
	int a[n];
	int box[n]={0};
	for(int i=0;i<n;i++){
		cin>>a[i];
		box[a[i]]++;
	}
	int m=0;
	long long int x=1
	int mod=1000000007;
	if(n%2==0){
		for(int i=0;i<n;i++){
			if(box[i]==1||box[i]>2){
				cout<<0<<endl;
				return 0;
			}
		}
		for(int i=0;i<n/2;i++){
			x*=2;
		}
		x%=mod;
		cout<<x<<endl;
	}
	else{
		if(box[0]!=1){
			cout<<0<<endl;
			return 0;
		}
		for(int i=0;i<n;i++){
			if(box[i]!=0&&box[i]!=2){
				cout<<0<<endl;
				return 0;
			}
		}
		for(int i=0;i<n/2;i++){
				x*=2;
		}
		x%=mod;
		cout<<x<<endl;
	}
		
		
}		

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: expected ',' or ';' before 'int'
   15 |         int mod=1000000007;
      |         ^~~
a.cc:26:20: error: 'mod' was not declared in this scope
   26 |                 x%=mod;
      |                    ^~~
a.cc:43:20: error: 'mod' was not declared in this scope
   43 |                 x%=mod;
      |                    ^~~
Language: C++

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
	int n, a[100000], i, cnt = 0, sum = 1, j, k = 0,x;
	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &a[i]);
	}
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			if (a[i] == a[j]&&i!=j) {
				cnt += 1;
			}
		}
		if (cnt != 1 && a[i] != 0 || cnt != 0 && a[i] == 0) {
			printf("0");
			k = 1;
			break;
		}
		cnt = 0;
	}
	if (k == 0) {
               x=n/2;
		while(x!=0){
                     if (sum >= 1000000007) {
				sum -= 1000000007;
		        }
                      if(x%2=0){
                            sum*=4;
                            x/2;
                      }
                      else{
                            sum*=2;
                             x-1;
                       }     
                 }
			
		printf("%d", sum);
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:27: error: lvalue required as left operand of assignment
   28 |                       if(x%2=0){
      |                          ~^~
Language: C++

int main() {
	int n, a[100000], i, cnt = 0, sum = 1, j, k = 0;
	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &a[i]);
	}
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			if (a[i] == a[j]&&i!=j) {
				cnt += 1;
			}
		}
		if (cnt != 1 && a[i] != 0 || cnt != 0 && a[i] == 0) {
			printf("0");
			k = 1;
			break;
		}
		cnt = 0;
	}
	if (k == 0) {
		for (i = 0; i < n / 2; i++) {
			if (sum >= 1000000007) {
				sum -= 1000000007;
			}
			sum *= 2;
		}
		printf("%d", sum);
	}
}


Compiler output:
a.cc: In function 'int main()':
a.cc:3:9: error: 'scanf' was not declared in this scope
    3 |         scanf("%d", &n);
      |         ^~~~~
a.cc:14:25: error: 'printf' was not declared in this scope
   14 |                         printf("0");
      |                         ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | int main() {
a.cc:27:17: error: 'printf' was not declared in this scope
   27 |                 printf("%d", sum);
      |                 ^~~~~~
a.cc:27:17: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
Language: C++

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
int main() {
	int n, a[100000], i, cnt = 0, max = 0, sum = 1,j;
	scanf("%d", &n);
	for (i = 0; i < n; i++) {
		scanf("%d", &a[i]);
		if (a[i] == 0) {
			cnt = 1;
		}
		if (a[i] >= max) {
			max = a[i];
		}
	}
	for (i = 0; i < n; i++) {
		for (j = 0; j < n; j++) {
			if (a[i] == a[j]) {
				cnt++;
			}
		}
		if (cnt != 2 && a[i] != 0 || cnt != 1 && a[i] == 0) {
			printf("0");
			return 0;
		}
	}
	for (i = 0; i < n / 2; i++) {
		if (sum >= 1000000007) {
			sum -= 1000000007;
		}
		sum *= 2;
	}
	printf("%d", sum);

Compiler output:
a.cc: In function 'int main()':
a.cc:32:27: error: expected '}' at end of input
   32 |         printf("%d", sum);
      |                           ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C++

#include <iostream>
#include <algorithm>
#include <functional>
#include<vector>
#include<math.h>
#include<bitset>
#include<string>
#include <deque>
#include<queue>
#include<map>
using namespace std;

int X[10000];
int mod = 1e9 + 7;

int main() {
	int N;
	long long int Y = 0;
	int Z = 0;
	int a;
		cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> a;
		X[a]++;
		if (X[a] == 3) { 
			Z = 5;
		}
	}

	for (int i = 0; i < 10000; i++) {
		if (X[i] == 1) {
			if (N%2==1&&i==0) {
				Z++;
			}
			else {
				Z = 5;
			}
		}
		else if (X[i] == 2) {
			Y++;
		}
		
	}

	
	if (N % 2 == 0) {
		if (Z > 0)cout << 0 << endl;
		else {
			long long int R = 1;
			for (int i = 0; i < N / 2; i++) {

				R = R % mod * 2;
			}
			cout << R << endl; }

	}
	else {
		if (Z == 1) {
			long long int R = 1;
			for (int i = 0; i < N / 2; i++) {

				R = R % mod * 2;
			}
			cout << R << endl;
		}
		else {
		
			cout << 0 << endl;
		}
		
	}
	return 0;


}
#include <iostream>
#include <algorithm>
#include <functional>
#include<vector>
#include<math.h>
#include<bitset>
#include<string>
#include <deque>
#include<queue>
#include<map>
using namespace std;

int X[10000];
int mod = 1e9 + 7;

int main() {
	int N;
	long long int Y = 0;
	int Z = 0;
	int a;
		cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> a;
		X[a]++;
		if (X[a] == 3) { 
			Z = 5;
		}
	}

	for (int i = 0; i < 10000; i++) {
		if (X[i] == 1) {
			if (N%2==1&&i==0) {
				Z++;
			}
			else {
				Z = 5;
			}
		}
		else if (X[i] == 2) {
			Y++;
		}
		
	}

	
	if (N % 2 == 0) {
		if (Z > 0)cout << 0 << endl;
		else {
			long long int R = 1;
			for (int i = 0; i < N / 2; i++) {

				R = R % mod * 2;
			}
			cout << R << endl; }

	}
	else {
		if (Z == 1) {
			long long int R = 1;
			for (int i = 0; i < N / 2; i++) {

				R = R % mod * 2;
			}
			cout << R << endl;
		}
		else {
		
			cout << 0 << endl;
		}
		
	}
	return 0;


}


Compiler output:
a.cc:88:5: error: redefinition of 'int X [10000]'
   88 | int X[10000];
      |     ^
a.cc:13:5: note: 'int X [10000]' previously declared here
   13 | int X[10000];
      |     ^
a.cc:89:5: error: redefinition of 'int mod'
   89 | int mod = 1e9 + 7;
      |     ^~~
a.cc:14:5: note: 'int mod' previously defined here
   14 | int mod = 1e9 + 7;
      |     ^~~
a.cc:91:5: error: redefinition of 'int main()'
   91 | int main() {
      |     ^~~~
a.cc:16:5: note: 'int main()' previously defined here
   16 | int main() {
      |     ^~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <functional>
#include<vector>
#include<math.h>
#include<bitset>
#include<string>
#include <deque>
#include<queue>
#include<map>
using namespace std;

int X[10000];

int main() {
	int N;
	long long int Y = 0;
	int Z = 0;
	int a;
		cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> a;
		X[a]++;
		if (X[a] == 3) { 
			Z = 5;
		}
	}

	for (int i = 0; i < 10000; i++) {
		if (X[i] == 1) {
			if (N%2==1&&i==0) {
				Z++;
			}
			else {
				Z = 5;
			}
		}
		else if (X[i] == 2) {
			Y++;
		}
		
	}

	long long int R = 1;
	for (int i = 0; i < Y; i++) {
		R *= 2;
		R %= 1000000007;
	}

	if (N % 2 == 0) {
		if (Z > 0)cout << 0 << endl;
		else cout << R<< endl;
	}
	else {
		if (Z == 1) {
			cout << R << endl;
		}
		else {
		
			cout << 0 << endl;
		}
		return 0;
	}


Compiler output:
a.cc: In function 'int main()':
a.cc:63:10: error: expected '}' at end of input
   63 |         }
      |          ^
a.cc:15:12: note: to match this '{'
   15 | int main() {
      |            ^
Language: C++

#include <iostream>
#include <algorithm>
#include <functional>
#include<vector>
#include<math.h>
#include<bitset>
#include<string>
#include <deque>
#include<queue>
#include<map>
using namespace std;

int X[10000];

int main() {
	int N;
	long long int Y = 0;
	int Z = 0;
	int a;
		cin >> N;
	for (int i = 0; i < N; i++) {
		cin >> a;
		X[a]++;
		if (X[a] == 3) { 
			Z = 5;
		}
	}

	for (int i = 0; i < 10000; i++) {
		if (X[i] == 1) {
			if (N%2==1&&i==0) {
				Z++;
			}
			else {
				Z = 5;
			}
		}
		else if (X[i] == 2) {
			Y++;
		}
		
	}

	long long int R = pow(2, Y);

	if (N % 2 == 0) {
		if (Z > 0)cout << 0 << endl;
		else cout << R%1000000007 << endl;
	}
	else {
		if (Z == 1) {
			cout << R%1000000007 << endl;
		}
		else {
		
			cout << 0 << endl;
		}
		return 0;
	}


Compiler output:
a.cc: In function 'int main()':
a.cc:59:10: error: expected '}' at end of input
   59 |         }
      |          ^
a.cc:15:12: note: to match this '{'
   15 | int main() {
      |            ^
Language: C++

#include<iostream>
#include<math.h>
#include<algorithm>

using namespace std;

int N, temp;
bool c = true
long long ans = 1;
int line[100100];

void checkList(){
    if(N % 2 == 1){
        /*if(line[0] != 0){
            return 0;
        }
        for(int i = 0; i < N; i++){
            temp = i;
            if(i % 2 == 1){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }*/
        for(int i = 0; i < N; i++){
            if(line[i] != (i+1)/2*2){
                c = false;
            }
        }

    }else{
        /*for(int i = 0; i < N; i++){
            temp = i;
            if(i % 2 ==0){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }*/
        for(int i = 0; i < N; i++){
            if(line[i] != i/2*2+1){
                c  = false;
            }
        }

    }
    /*for(int i = 0; i < N / 2; i++){
        ans *= 2;
    }*/
}


int main(){
    cin >>N;
    for(int i = 0; i < N; i++){
        cin >>line[i];
    }
    sort(line, line + N);
    checkList();
    //for(int i = 0; i < N; i++) {
       // if(i)cout << " ";
     //   cout << line[i];
    //}
    for(int i = 0; i < N / 2; i++){
        ans *= 2;
    }
    cout << ans << endl;

}

Compiler output:
a.cc:9:1: error: expected ',' or ';' before 'long'
    9 | long long ans = 1;
      | ^~~~
a.cc: In function 'int main()':
a.cc:67:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   67 |         ans *= 2;
      |         ^~~
      |         abs
a.cc:69:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   69 |     cout << ans << endl;
      |             ^~~
      |             abs
Language: C++

#include<iostream>
#include<math.h>
#include<algorithm>

using namespace std;

int N, temp;
int ans = 1;
int line[100100];

int checkList(){
    if(N % 2 == 1){
        if(line[0] != 0){
            return 0;
        }
        for(int i = 0; i < N; i++){
            temp = i;
            if(i % 2 == 1){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }
        for(int i = 0; i < (N - 1) / 2; i++){
            ans *= 2;
        }

        return ans % ;
    }else{
        for(int i = 0; i < N; i++){
            temp = i;
            if(i % 2 ==0){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }
        for(int i = 0; i < N / 2; i++){
            ans *= 2;
        }
        return ans % 1000000007;
    }
}


int main(){
    cin >>N;
    for(int i = 0; i < N; i++){
        cin >>line[i];
    }
    sort(line, line + N);
    ans = checkList();
    //for(int i = 0; i < N; i++) {
       // if(i)cout << " ";
     //   cout << line[i];
    //}
    cout << ans << endl;

}

Compiler output:
a.cc: In function 'int checkList()':
a.cc:29:22: error: expected primary-expression before ';' token
   29 |         return ans % ;
      |                      ^
Language: C++

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

int main() {
	int n,a[100005];
	cin>>n;
	for(int i=0;i<n;i++) cin>>a[i];
	sort(a,a+n);
	
	bool check = true;
	if(n%2!=0){
		int m=2;
		if(a[0]!=0)check=false;
		for(int i=1;i<n;){
			if(a[i]!=m||a[i+1]!=m)check=false;
			m += 2;
			i += 2;
		}
	}
	if(n%2==0){
		int m=1;
		for(int i=0;i<n/2;){
			if(a[i]!=m||a[i+1]!=m)
			m += 2;
			i += 2;
		}
	}
	
	long long int ex = 1000000007;
	if(check==1){cout<<pow(2,n/2)%ex<<endl;}
	
	else if(check==0)cout<<0<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:38: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'long long int' to binary 'operator%'
   30 |         if(check==1){cout<<pow(2,n/2)%ex<<endl;}
      |                            ~~~~~~~~~~^~~
      |                               |       |
      |                               |       long long int
      |                               __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include <iostream>

using namespace std;

int main(){
    int n;
    cin >> n;
    int array[n];
    for(int i = 0; i<n; i++){
        cin >> array[i];
    }
    sort(array, array+n);
    bool flag = true;
    int ans = 1;
    if(n%2==0){
        for(int i=0; i<n; i++){
            if(array[i] != i/2 * 2 + 1){
                flag = false;
                break;
            }
            if( (i+1)%2==0){
                ans = ans * 2 % 1000000007;
            }
        }
    }else{
        for(int i = 0; i<n; i++){
            if(array[i] != (1+i)/2 * 2){
                flag = false;
                break;
            }
            if( (i+1)%2==0){
                ans = ans * 2 % 1000000007;
            }
        }
    }
    if(!flag)ans = 0;
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |     sort(array, array+n);
      |     ^~~~
      |     short
Language: C++

#include<iostream>
#include<math.h>
#include<algorithm>

using namespace std;


long long judge(int N, int line[]){
    int temp;

    if(N % 2 == 0){
        for(int i = 0; i < N; i++){
            temp = i;
            if(i % 2 == 0){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }
        return (long long)powl(2, N/2) % (long long)1ep + 7;
        //return pow(2, N/2);
    }else{
        if(line[0] != 0){
            return 0;
        }
        for(int i = 1; i < N; i++){
            temp = i;
            if(i % 2 == 1){
                temp++;
            }
            if(line[i] != temp){
                return 0;
            }
        }
        return (long long)powl(2, (N - 1) / 2) % (long long)1e9 + 7;
        //return pow(2, (N - 1) / 2);
    }
}

int main(){
    int N;
    long long ans;
    cin >>N;
    int line[N];
    for(int i = 0; i < N; i++){
        cin >>line[i];
    }
    sort(line, line + N);
    ans = judge(N, line);
    cout << ans << endl;

    //cout << ans / (pow(10, 9) +7) << endl;
}

Compiler output:
a.cc:21:53: error: exponent has no digits
   21 |         return (long long)powl(2, N/2) % (long long)1ep + 7;
      |                                                     ^~~
Language: C++

#include <cstdio>
#include <iostream>
using namespace std;
#define mod 1000000007
int x[100010];
 
int main(){
  int n; cin >> n;
  for (int i = 0; i < n; i++) {
    int k;
    cin >> k;
    x[k]++;
  }
  if (n % 2 == 1) {
    bool flag = true;
    long long ans = 1;
    if (x[0] != 1) flag = false;
    for (int i = 2; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  } else {
    bool flag = true;
    long long ans = 1;
    for (int i = 1; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  }
  return 0;
}
#include <cstdio>
#include <iostream>
using namespace std;
#define mod 1000000007
int x[100010];

int main(){
  int n; cin >> n;
  for (int i = 0; i < n; i++) {
    int k;
    cin >> k;
    x[k]++;
  }
  if (n % 2 == 1) {
    bool flag = true;
    long long ans = 1;
    if (x[0] != 1) flag = false;
    for (int i = 2; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  } else {
    bool flag = true;
    long long ans = 1;
    for (int i = 1; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  }
  return 0;
}


Compiler output:
a.cc:42:5: error: redefinition of 'int x [100010]'
   42 | int x[100010];
      |     ^
a.cc:5:5: note: 'int x [100010]' previously declared here
    5 | int x[100010];
      |     ^
a.cc:44:5: error: redefinition of 'int main()'
   44 | int main(){
      |     ^~~~
a.cc:7:5: note: 'int main()' previously defined here
    7 | int main(){
      |     ^~~~
Language: C++

#include <iostream>
using namespace std;
#define mod 1000000007
int x[100010];
 
int main(){
  int n; cin >> n;
  for (int i = 0; i < n; i++) {
    int k;
    cin >> k;
    x[k]++;
  }
  if (n % 2 == 1) {
    bool flag = true;
    long long ans = 1;
    if (x[0] != 1) flag = false;
    for (int i = 2; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  } else {
    bool flag = true;
    long long ans = 1;
    for (int i = 1; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  }
  return 0;
}
#include <cstdio>
#include <iostream>
using namespace std;
#define mod 1000000007
int x[100010];

int main(){
  int n; cin >> n;
  for (int i = 0; i < n; i++) {
    int k;
    cin >> k;
    x[k]++;
  }
  if (n % 2 == 1) {
    bool flag = true;
    long long ans = 1;
    if (x[0] != 1) flag = false;
    for (int i = 2; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  } else {
    bool flag = true;
    long long ans = 1;
    for (int i = 1; i < n; i += 2) {
      if (x[i] != 2) flag = false;
      ans *= 2;
      ans %= mod;
    }
    if (!flag) cout << 0 << endl;
    else cout << ans << endl;
  }
  return 0;
}


Compiler output:
a.cc:41:5: error: redefinition of 'int x [100010]'
   41 | int x[100010];
      |     ^
a.cc:4:5: note: 'int x [100010]' previously declared here
    4 | int x[100010];
      |     ^
a.cc:43:5: error: redefinition of 'int main()'
   43 | int main(){
      |     ^~~~
a.cc:6:5: note: 'int main()' previously defined here
    6 | int main(){
      |     ^~~~
Language: C++

#include<iostream>
#include<string>
#include<cmath>
 
using namespace std;
typedef long long ll;

int main(){

int n;
int A[100100];
const int MOD = 1e9+7;

cin >> n;

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

long long ans = 1;
flag = 1;

if(n % 2 == 1){
 if(A[0] != 1) {flag = 0;}
for(int i = 2; i < n; i+=2){
 if(A[i] != 2) {flag = 0;}
  ans*=2;
  ans %= MOD;
 }
}

else{
for(int i = 1; i < n; i+=2){
 if(A[i] != 2) {flag = 0;}
  ans*=2;
  ans %= MOD;
 }
}

if(flag == 0) cout << 0 << endl;
else            cout << ans << endl;

return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:1: error: 'flag' was not declared in this scope
   19 | flag = 1;
      | ^~~~
Language: C++

#include<iostream>
#include<string>
#include <cmath>
using namespace std;
typedef long long ll;

int main(){

ll ans = 1;
int a[100100];
const int MOD = 1e9+7;

int n;
cin >> n;

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

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

else{
for(int i = 1; i < n; i += 2)
if(a[i] == 2)  (ans *= 2) %= MOD;
else  {cout << 0 << endl return 0;}
}

cout << ans << endl;

return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:24: error: expected ';' before 'return'
   22 | else {cout << 0 << endl return 0;}
      |                        ^~~~~~~
      |                        ;
a.cc:28:25: error: expected ';' before 'return'
   28 | else  {cout << 0 << endl return 0;}
      |                         ^~~~~~~
      |                         ;
Language: C++

#include<iostream>
#include<string>
#include <cmath>
using namespace std;

int main(){

ll n,p,i,ans = 1;
int a[100000];
const int MOD = 1e9+7;


cin >> n;

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

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

else{
for(i = 1; i < n; i += 2)
if(a[i] == 2)  (ans *= 2) %= MOD;
else {ans = 0; break;}
}

cout << ans << endl;

return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:1: error: 'll' was not declared in this scope
    8 | ll n,p,i,ans = 1;
      | ^~
a.cc:13:8: error: 'n' was not declared in this scope
   13 | cin >> n;
      |        ^
a.cc:15:5: error: 'i' was not declared in this scope
   15 | for(i = 0; i < n; i++) {cin >> p; a[p]++;}
      |     ^
a.cc:15:32: error: 'p' was not declared in this scope
   15 | for(i = 0; i < n; i++) {cin >> p; a[p]++;}
      |                                ^
a.cc:18:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   18 |  if(a[0] != 1)  ans = 0;
      |                 ^~~
      |                 abs
a.cc:19:10: error: 'i' was not declared in this scope
   19 | else for(i = 2; i < n; i+=2){
      |          ^
a.cc:20:16: error: 'ans' was not declared in this scope; did you mean 'abs'?
   20 | if(a[i] == 2) (ans *= 2) %= MOD;
      |                ^~~
      |                abs
a.cc:21:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   21 | else {ans = 0; break;}
      |       ^~~
      |       abs
a.cc:26:5: error: 'i' was not declared in this scope
   26 | for(i = 1; i < n; i += 2)
      |     ^
a.cc:27:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   27 | if(a[i] == 2)  (ans *= 2) %= MOD;
      |                 ^~~
      |                 abs
a.cc:28:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   28 | else {ans = 0; break;}
      |       ^~~
      |       abs
a.cc:31:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 | cout << ans << endl;
      |         ^~~
      |         abs
Language: C++

#include<iostream>
#include<string>
#include <cmath>
#define MOD 1000000007
using namespace std;

int main(){

int n,p,i,ans = 1;
int a[100000];

cin >> n;

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

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

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


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


return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:2: error: expected '}' at end of input
   34 | }
      |  ^
a.cc:7:11: note: to match this '{'
    7 | int main(){
      |           ^
Language: C++

#include<iostream>
#include<string>
#include <cmath>
#define INF 1000000007
using namespace std;

int main(){

int n,p,i,ans = 1;
int a[100000];

cin >> n;

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

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

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


if(ans == 0) cout << 0 << endl;
else cout << pow(2,n/2) % INF <<endl;


return 0;
}

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

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

int a[100005];

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

    int ma = 0;
    for(int i=0; i < n; i++){
        int temp;
        cin >> temp;
        ma = max(ma, temp);
        a[temp] += 1;
    }


    int flag = 0;
    int Flag = 0;
    while(ma > 0){
        if(a[ma] == 2) flag = 1;
        if(flag == 0) Flag = 1;
        flag = 0;
        ma -= 2;
    }

    long long res = (pow(2, n / 4) % 1000000007) * (pow(2, n / 4) % 1000000007) % 1000000007;
    if(Flag) cout << 0 << endl;
    else if(n % 2 == 1 and a[0] == 1) cout << res << endl;
    else if(n % 2 == 0 and a[0] == 0) cout << res << endl;
    else cout << 0 << endl;

    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:28:36: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   28 |     long long res = (pow(2, n / 4) % 1000000007) * (pow(2, n / 4) % 1000000007) % 1000000007;
      |                      ~~~~~~~~~~~~~ ^ ~~~~~~~~~~
      |                         |            |
      |                         |            int
      |                         __gnu_cxx::__promote<double>::__type {aka double}
a.cc:28:67: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   28 |     long long res = (pow(2, n / 4) % 1000000007) * (pow(2, n / 4) % 1000000007) % 1000000007;
      |                                                     ~~~~~~~~~~~~~ ^ ~~~~~~~~~~
      |                                                        |            |
      |                                                        |            int
      |                                                        __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

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

int a[100005];

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

    int ma = 0;
    for(int i=0; i < n; i++){
        int temp;
        cin >> temp;
        ma = max(ma, temp);
        a[temp] += 1;
    }


    int flag = 0;
    while(ma > 0){
        if(a[ma] == 2) flag = 1;
        if(flag == 0) goto cant;
        flag = 0;
        ma -= 2;
    }

    if(n % 2 == 1 and a[0] == 1) cout << pow(2, n/2) % (1000000007) << endl;
    else if(n % 2 == 0 and a[0] == 0) cout << pow(2, n/2) % (1000000007) << endl;
    else cout << 0 << endl;

    return 0;

    cant:
    cout << 0 << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:54: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   27 |     if(n % 2 == 1 and a[0] == 1) cout << pow(2, n/2) % (1000000007) << endl;
      |                                          ~~~~~~~~~~~ ^ ~~~~~~~~~~~~
      |                                             |           |
      |                                             |           int
      |                                             __gnu_cxx::__promote<double>::__type {aka double}
a.cc:28:59: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   28 |     else if(n % 2 == 0 and a[0] == 0) cout << pow(2, n/2) % (1000000007) << endl;
      |                                               ~~~~~~~~~~~ ^ ~~~~~~~~~~~~
      |                                                  |           |
      |                                                  |           int
      |                                                  __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

#include <iostream>

using namespace std;

int main() {
    int n;

    cin >> n;

    int a[100010], count[100010] = {0};

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

    if (n%2 == 1) {
        count[0]++;
    }

    for (int i = (n+1)%2; i < n; i += 2) {
        if (conut[i] != 2) {
            cout << 0 << endl;
            return 0;
        }
    }

    long long ans = 1;

    for (int i = 0; i < n/2; i++) {
        ans *= 2;
        ans %= 1000000007;
    }
    
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:13: error: 'conut' was not declared in this scope; did you mean 'count'?
   22 |         if (conut[i] != 2) {
      |             ^~~~~
      |             count
Language: C++

#include <iostream>
#include <vector>
#include <math.h>
using namespace std;

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

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

    sort(ls.begin(), ls.end());

    if (n % 2 == 0) {
        int count = 1;
        for (int i = 0; i < n; i++) {
            if(ls[i] != count) {
                cout << 0;
                return 0;
            }
            if (i % 2 != 0) {
                count += 2;
            }
        }

        cout << fmod(pow(2, n / 2), 1000000000 + 7);
        return 0;
    } else {
        if (ls[0] != 0) {
            cout << 0;
            return 0;
        }

        int count = 2;
        for (int i = 1; i < n; i++) {
            if(ls[i] != count) {
                cout << 0;
                return 0;
            }
            if (i % 2 == 0) {
                count += 2;
            }
        }
        cout << fmod(pow(2, (n - 1) / 2), 1000000000 + 7);
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   15 |     sort(ls.begin(), ls.end());
      |     ^~~~
      |     sqrt
Language: Java

import java.util.*;
public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int n = sc.nextInt();
		int sum = 0, ans = 1;
		for(int i = 0; i < n; i++) {
			sum += sc.nextInt();
		}
		int key = 0;
		for(int i = n; i > 1; i -= 2) {
			key += n - 1;
		}
		key *= 2;
		if(sum == key) {
			for(int i = 0; i < n / 2; i++) ans *= 2;
		}
		else ans = 0;
		ans = ans % (1000000000 + 7)
		System.out.println(ans);
	}
}


Compiler output:
Main.java:20: error: ';' expected
		ans = ans % (1000000000 + 7)
		                            ^
1 error
Language: C++

using namespace std;

#include <iostream>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <limits>
#include <climits>
#include <vector>
#include <string>
#include <set>
#include <queue>
#include <stack>
#include <map>
typedef long long ll;
typedef pair<int,int> p;

#define rep(i, n) for(int (i) = 0; (i) < (n); (i)++)




int main()
{
  // input & declare
  int n;
  cin >> n;
  std::vector<int> v;
  int tmp;
  for(int i = 0; i < n; i++)
  {
    cin >> tmp;
    v.push_back(tmp);
  }
  sort(v.begin(),v.end());


  // process
  ll result = 0;
  for(int i = 1; i < n; i += 2){
    // std::cout << i << '\n';
    if (n % 2 == 0) {
      if (v[i-1] == v[i] && v[i] == i) {
        result = ((result + 1) % (pow(10,9) + 7));
      }else{
        std::cout << "0" << '\n';
        exit(0);
      }
    }
    else if(n % 2 == 1){
      if (i == 1){
        v.erase(v.begin());
      }
      if (v[i-1] == v[i] && v[i] == i+1) {
        result = ((result + 1) % (pow(10,9) + 7));
      }else{
        std::cout << "0" << '\n';
        exit(0);
      }
    }
  }

  // output
  std::cout << pow(2,result) << '\n';
}


Compiler output:
a.cc: In function 'int main()':
a.cc:44:32: error: invalid operands of types 'll' {aka 'long long int'} and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   44 |         result = ((result + 1) % (pow(10,9) + 7));
      |                   ~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
      |                           |                 |
      |                           |                 __gnu_cxx::__promote<double>::__type {aka double}
      |                           ll {aka long long int}
a.cc:55:32: error: invalid operands of types 'll' {aka 'long long int'} and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   55 |         result = ((result + 1) % (pow(10,9) + 7));
      |                   ~~~~~~~~~~~~ ^ ~~~~~~~~~~~~~~~
      |                           |                 |
      |                           |                 __gnu_cxx::__promote<double>::__type {aka double}
      |                           ll {aka long long int}
Language: C++

#include <iostream>
#include <algorithm>
#include <unordered_map>

using namespace std;

int main() {

    int N;
    cin >> N;
    long a[N];
    unordered_map<long, long> aMap;

    for (int i = 0; i < N; ++i) {
        cin >> a[i];
        if (aMap.find(a[i]) == aMap.end()) {
            aMap[a[i]] = 1;
        } else {
            ++aMap[a[i]];
        }
    }

    if (N % 2 == 1) {
        if (aMap[0] != 1) {
            cout << "0" << endl;
            return 0;
        }

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

        cout << round(pow(2, (N - 1) / 2)) << endl;
    } else {
        if (aMap[0] != 0) {
            cout << "0" << endl;
            return 0;
        }
        for (int i = 1; i < N; ++i) {
            if (i % 2 == 0) {
                if (aMap[i] != 0) {
                    cout << "0" << endl;
                    return 0;
                }
            } else {
                if (aMap[i] != 2) {
                    cout << "0" << endl;
                    return 0;
                }
            }
        }
        cout << round(pow(2, N / 2));
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:23: error: 'pow' was not declared in this scope
   43 |         cout << round(pow(2, (N - 1) / 2)) << endl;
      |                       ^~~
a.cc:43:17: error: 'round' was not declared in this scope
   43 |         cout << round(pow(2, (N - 1) / 2)) << endl;
      |                 ^~~~~
a.cc:62:23: error: 'pow' was not declared in this scope
   62 |         cout << round(pow(2, N / 2));
      |                       ^~~
a.cc:62:17: error: 'round' was not declared in this scope
   62 |         cout << round(pow(2, N / 2));
      |                 ^~~~~
Language: C++

#include <iostream>
#include <unordered_map>

using namespace std;

int main() {
#ifdef __APPLE__
    freopen("input2.txt", "r", stdin);
#endif
    int N;
    cin >> N;
    long a[N];
    unordered_map<long, long> aMap;

    for (int i = 0; i < N; ++i) {
        cin >> a[i];
        if (aMap.find(a[i]) == aMap.end()) {
            aMap[a[i]] = 1;
        } else {
            ++aMap[a[i]];
        }
    }

    if (N % 2 == 1) {
        if (aMap[0] != 1) {
            cout << "0" << endl;
            return 0;
        }

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

        cout << round(pow(2, (N - 1) / 2)) << endl;
    } else {
        if (aMap[0] != 0) {
            cout << "0" << endl;
            return 0;
        }
        for (int i = 1; i < N; ++i) {
            if (i % 2 == 0) {
                if (aMap[i] != 0) {
                    cout << "0" << endl;
                    return 0;
                }
            } else {
                if (aMap[i] != 2) {
                    cout << "0" << endl;
                    return 0;
                }
            }
        }
        cout << round(pow(2, N / 2));
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:23: error: 'pow' was not declared in this scope
   44 |         cout << round(pow(2, (N - 1) / 2)) << endl;
      |                       ^~~
a.cc:44:17: error: 'round' was not declared in this scope
   44 |         cout << round(pow(2, (N - 1) / 2)) << endl;
      |                 ^~~~~
a.cc:63:23: error: 'pow' was not declared in this scope
   63 |         cout << round(pow(2, N / 2));
      |                       ^~~
a.cc:63:17: error: 'round' was not declared in this scope
   63 |         cout << round(pow(2, N / 2));
      |                 ^~~~~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
using namespace std;
typedef long long ll;
const ll mod=1e9+7;

int main() {
  int N;
  cin >> N;
  vector <ll> A(N);
  for (int i=0; i<N; i++) {
    cin >> A[i];
  }
  if (N%2==1) {
    a.push_back(0);
  }
  sort(A.begin(),A.end());
  for (int i=0; i<N; i+=2) {
    if (A[i]!=A[i+1]) {
      cout << 0 << endl;
      return 0;
    }
  }
  int ans=1;
  for(int i=0; i<N/2; i++) {
    ans*=2;
    ans%=mod;
  }
  cout << ans << endl;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'a' was not declared in this scope
   16 |     a.push_back(0);
      |     ^
Language: C++

#include <iostream>
#include <vector>
using namespace std;
typedef long long ll;

const ll mod=1e9+7;

int main() {
  int N;
  cin >> N;
  vector <ll> a(N);
  for (int i=0; i<N; i++) {
    cin >> a[i];
  }
  if (N%2==1) {
    a.push_back(0);
  }
  sort(a.begin(),a.end());
  for (int i=0; i<N; i+=2) {
    if (a[i]!=a[i+1]) {
      cout << 0 << endl;
      return 0;
    }
  }
  int ans=1;
  for(int i=0; i<N/2; i++) {
    ans*=2;
    ans%=mod;
  }
  cout << ans << endl;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:18:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   18 |   sort(a.begin(),a.end());
      |   ^~~~
      |   short