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

#include <bits/stdc++.h>
using namespace std;
int x[1e9];
int main()
{
	int n,a,cnt=0;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>a;
		if(x[a]==1)x[a]=0;
		else x[a]=1;
	}
	for(int i=1;i<=n;i++)
	{
		if(x[i]==1)cnt++;
	}
	cout<<cnt<<endl;
	return 0;
}

Compiler output:
a.cc:3:7: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
    3 | int x[1e9];
      |       ^~~
a.cc:3:7: error: could not convert '1.0e+9' from 'double' to 'long unsigned int'
    3 | int x[1e9];
      |       ^~~
      |       |
      |       double
a.cc:3:7: error: size of array 'x' has non-integral type 'double'
Language: C++

#include <bits/stdc++.h>
using namespace std;
int n, a, s[1000000001], ans;
int main ()
{
	scanf("%d",&n);
	for(int i=1;i<=n;i++)
	{
		scanf("%d",&a);
		s[a]++;
	}
	for(int i=1;i<=1000000000;i++)
		if(s[a]%2!=0) ans++;
	printf("%d\n",ans);	
	return 0;
} 

Compiler output:
/tmp/ccyghgOw.o: in function `main':
a.cc:(.text+0xba): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccyghgOw.o
a.cc:(.text+0xc3): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccyghgOw.o
a.cc:(.text+0xd6): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccyghgOw.o
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>

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

using namespace std;

int main(){
	int n; cin>>n;
	map<int,int> f;
	rep(i,n){ int a; cin>>a; ++f[a]; }

	int ans=0;
	for(auto x:f) ans+=x->second%2;
	cout<<ans<<endl;

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:29: error: base operand of '->' has non-pointer type 'std::pair<const int, int>'
   13 |         for(auto x:f) ans+=x->second%2;
      |                             ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> B(1000000000);
  for(int i=0;i<1000000000;i++){
    B[i]=0;
  }
  vector<int> A(N);
  for(int i=0){
    cin >> A[i];
    B[A[i]]++;
  }
  int cnt=0;
  for(int i=0;i<1000000000;i++){
    if(B[i]%2==1){
      cnt++;
    }
  }
  cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: expected ';' before ')' token
   11 |   for(int i=0){
      |              ^
      |              ;
a.cc:11:14: error: expected primary-expression before ')' token
a.cc:11:14: error: expected ';' before ')' token
   11 |   for(int i=0){
      |              ^
      |              ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> B(1000000000);
  for(int i=0;i<1000000000;i++){
    B[i]=0;
  }
  vector<int> A(N);
  for(int i=0){
    cin >> A[i];
    B[A[i]]++;
  }
  int cnt=0;
  for(int i=0;i<1000000000;i++){
    if(B[i]%2==1){
      cnt++
    }
  }
  cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: expected ';' before ')' token
   11 |   for(int i=0){
      |              ^
      |              ;
a.cc:11:14: error: expected primary-expression before ')' token
a.cc:11:14: error: expected ';' before ')' token
   11 |   for(int i=0){
      |              ^
      |              ;
a.cc:18:12: error: expected ';' before '}' token
   18 |       cnt++
      |            ^
      |            ;
   19 |     }
      |     ~
Language: C++

#include<bits/stdc++.h>
using namespace std; 
int main(){
  int n,ptr=0,res=0;
  cin>>n;
  int v[n];
  for(int i=0;i<n;i++) cin>>v[i]; 
  sort(v.begin(),v.end());
  while(ptr<n){
    int cc=v[ptr],f=0;
    while(v[ptr]==cc){
      f++;
      ptr++;
    }
    res+=f%2;
  }
  cout<<res<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:10: error: request for member 'begin' in 'v', which is of non-class type 'int [n]'
    8 |   sort(v.begin(),v.end());
      |          ^~~~~
a.cc:8:20: error: request for member 'end' in 'v', which is of non-class type 'int [n]'
    8 |   sort(v.begin(),v.end());
      |                    ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std; 
int N,ptr,res;
int A[100000]; 
int main (){
  cin>>n;
  for(int i=0;i<N;i++) cin>>A[i]; 
  sort(A,A+N);
  while(ptr<N){
    int cc=A[ptr],f=0;
    while(ptr<N&&A[ptr]==cc) f++,ptr++;
    res+=f%2;
  }
  cout<<res<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: 'n' was not declared in this scope
    6 |   cin>>n;
      |        ^
Language: C++

#include<bits/stdc++.h>
using namespace std; 
int N,ptr,res;
int A[100000]; 
int main (){
  cin>>n;
  for(int i=0;i<N;i++) cin>>A[i]; 
  sort(A.begin(),A.end());
  while(ptr<N){
    int cc=A[ptr],f=0;
    while(ptr<N&&A[ptr]==cc) f++,ptr++;
    res+=f%2;
  }
  cout<<res<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: 'n' was not declared in this scope
    6 |   cin>>n;
      |        ^
a.cc:8:10: error: request for member 'begin' in 'A', which is of non-class type 'int [100000]'
    8 |   sort(A.begin(),A.end());
      |          ^~~~~
a.cc:8:20: error: request for member 'end' in 'A', which is of non-class type 'int [100000]'
    8 |   sort(A.begin(),A.end());
      |                    ^~~
Language: C++

#include <cstdio >
#include <algorithm > 
using namespace std; 
int N,ptr,res;
int A[100000]; 
int main (){
  scanf("%d",&N);
  for(int i=0;i<N;i++) scanf("%d",&A[i]); 
  sort(A,A+N);
  while(ptr<N){
    int cc=A[ptr],f=0;
    while(ptr<N&&A[ptr]==cc) f++,ptr++;
    res+=f%2;
  }
  printf("%d\n",res);
}

Compiler output:
a.cc:1:10: fatal error: cstdio : No such file or directory
    1 | #include <cstdio >
      |          ^~~~~~~~~
compilation terminated.
Language: C++

#include <cstdio > #include <algorithm > using namespace std; int N,ptr,res;
int A[100000]; int main ()
{
scanf("%d",&N);
for(int i=0;i<N;i++)scanf("%d",&A[i]); sort(A,A+N);
while(ptr<N)
{
int cc=A[ptr],f=0; while(ptr<N&&A[ptr]==cc)f++,ptr++; res+=f%2;
} printf("%d\n",res);
}

Compiler output:
a.cc:1:20: warning: extra tokens at end of #include directive
    1 | #include <cstdio > #include <algorithm > using namespace std; int N,ptr,res;
      |                    ^
a.cc:1:10: fatal error: cstdio : No such file or directory
    1 | #include <cstdio > #include <algorithm > using namespace std; int N,ptr,res;
      |          ^~~~~~~~~
compilation terminated.
Language: C++

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

int main(){
  int N,a=0,ans=0;
  cin>>N;
  int A[1000000000];
  for(int i=0;i<N;i++) scanf("%d",&A[i]);
  sort(A,A+N);
  while(a<N){
    int x=A[a],count=0;
    while(a<N && x==A[a]){
      count++; a++;
    }res+=count%2;
  }cout<<res<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:6: error: 'res' was not declared in this scope
   14 |     }res+=count%2;
      |      ^~~
a.cc:15:10: error: 'res' was not declared in this scope
   15 |   }cout<<res<<endl;
      |          ^~~
Language: C++

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

int main(){
  int n;
  cin>>n;
  vector<bool> flag(1000000001,false);
  for(int i=0;i<n;i++){
    int a;
    cin>>a;
    if(num[a]) num[a]=true;
    else num[a]=true;
  }int count=0;
  for(int i=1;i<1000000001;i++){
    if(num[i]) count++;
  }
  cout<<count<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:8: error: 'num' was not declared in this scope; did you mean 'enum'?
   11 |     if(num[a]) num[a]=true;
      |        ^~~
      |        enum
a.cc:15:8: error: 'num' was not declared in this scope; did you mean 'enum'?
   15 |     if(num[i]) count++;
      |        ^~~
      |        enum
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin >> n;
  vector<int> da(n);
  map<int,int> ma;
  for(int i=0;i<n;i++){
    cin >> da[i];
    if(ma.count(da[i])){
      ma[da[i]]++;
    }
    else{
      ma[da[i]]=1;
    }
  }
  int ans=0;
  for(auto i;ma){
    if(i.second%2){
      ans++;
    }
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:7: error: declaration of 'auto i' has no initializer
   18 |   for(auto i;ma){
      |       ^~~~
a.cc:18:14: error: could not convert 'ma' from 'std::map<int, int>' to 'bool'
   18 |   for(auto i;ma){
      |              ^~
      |              |
      |              std::map<int, int>
a.cc:18:16: error: expected ';' before ')' token
   18 |   for(auto i;ma){
      |                ^
      |                ;
Language: C++

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <vector>
#include <queue>
#include <ctime>
#include <map>
#include <iomanip>
using namespace std;
 
#define FOR(i,a,b) for (ll i = (a); i < (b); i++)
#define REP(i,n) FOR(i,0,n)
 
long gcd(long long a, long long b){
	if (a%b==0){
		return b;
	}
	else{
		return gcd(b,a%b);
	}
}
 
long lcm(long long a, long long b){
	return a / gcd(a,b) * b;
}
 
template<typename A, typename B> inline bool chmax(A &a, B b) { if (a < b) { a = b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a > b) { a = b; return 1; } return 0; }
 
typedef long long ll;
 
const ll INF = 1ll<<60;
const ll MOD = 1000000007;
const double EPS = 1e-10;

int n;
ll a[1123456789];
ll cnt, m;

int main(){
	cin >> n;
	
	REP(i,n){
		int num;
		cin >> num;
		
		a[num]++;
		a[num]%=2;
		
		if (m < num) m = num;
	}
	
	REP(i,m) if(a[i] == 1) cnt++;
	
	cout << cnt << endl;
	
	return 0;
}

Compiler output:
/tmp/ccH7PWxM.o: in function `main':
a.cc:(.text+0x141): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccH7PWxM.o
a.cc:(.text+0x152): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccH7PWxM.o
a.cc:(.text+0x197): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccH7PWxM.o
a.cc:(.text+0x1a2): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccH7PWxM.o
a.cc:(.text+0x1ae): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccH7PWxM.o
a.cc:(.text+0x1bb): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccH7PWxM.o
collect2: error: ld returned 1 exit status
Language: C++

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstdlib>
#include <cstring>
#include <cmath>
#include <vector>
#include <queue>
#include <ctime>
#include <map>
#include <iomanip>
using namespace std;
 
#define FOR(i,a,b) for (ll i = (a); i < (b); i++)
#define REP(i,n) FOR(i,0,n)
 
long gcd(long long a, long long b){
	if (a%b==0){
		return b;
	}
	else{
		return gcd(b,a%b);
	}
}
 
long lcm(long long a, long long b){
	return a / gcd(a,b) * b;
}
 
template<typename A, typename B> inline bool chmax(A &a, B b) { if (a < b) { a = b; return 1; } return 0; }
template<typename A, typename B> inline bool chmin(A &a, B b) { if (a > b) { a = b; return 1; } return 0; }
 
typedef long long ll;
 
const ll INF = 1ll<<60;
const ll MOD = 1000000007;
const double EPS = 1e-10;

int n;
ll a[1123456789];
ll cnt, m;

int main(){
	cin >> n;
	
	REP(i,n){
		int num;
		cin >> num;
		
		a[num]++;
		a[num]%=2;
		
		if (m < num) m = num;
	}
	
	REP(i,m) if(a[i] == 1) cnt++;
	
	cout << cnt << endl;
	
	return 0;
}

Compiler output:
/tmp/ccvwRpQ7.o: in function `main':
a.cc:(.text+0x141): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccvwRpQ7.o
a.cc:(.text+0x152): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccvwRpQ7.o
a.cc:(.text+0x197): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccvwRpQ7.o
a.cc:(.text+0x1a2): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccvwRpQ7.o
a.cc:(.text+0x1ae): relocation truncated to fit: R_X86_64_PC32 against symbol `m' defined in .bss section in /tmp/ccvwRpQ7.o
a.cc:(.text+0x1bb): relocation truncated to fit: R_X86_64_PC32 against symbol `cnt' defined in .bss section in /tmp/ccvwRpQ7.o
collect2: error: ld returned 1 exit status
Language: C++

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


int main(){
    int N;
    cin >> N;
    set<int> s;
    for (int i = 0; i < N; i++) {
        int a;
        cin >> a;
        if (s.contains(a)) s.erase(a);
        else s.insert(a);
    }
    cout << s.size() << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:15: error: 'class std::set<int>' has no member named 'contains'
   12 |         if (s.contains(a)) s.erase(a);
      |               ^~~~~~~~
Language: Java

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

int main() {

  int N;
  cin >> N;

  map<int, int> map;

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

  int count = 0;

  for (auto i: map) {
    if (i.second % 2 != 0) {
      count++;
    }
  }

  cout << count << endl;

}

Compiler output:
Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, enum, or record expected
#include <bits/stdc++.h>
         ^
Main.java:7: error: not a statement
  cin >> N;
      ^
Main.java:13: error: not a statement
    cin >> A;
        ^
Main.java:25: error: not a statement
  cout << count << endl;
                ^
Main.java:4: error: unnamed classes are a preview feature and are disabled by default.
int main() {
^
  (use --enable-preview to enable unnamed classes)
6 errors
Language: Java

public class Main {

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int amount_number = sc.nextInt();
		int count = 0;

		ArrayList<Integer> array_number = new ArrayList<>();
		for (int i =0; i < amount_number; i++) {
			int input_number = sc.nextInt();
			array_number.add(input_number);
		}

		Collections.sort(array_number);

		for (int i = 0; i < amount_number - 1; i++) {
			if (array_number.get(i) != array_number.get(i +1)) {
				count ++;
			}
			else {
				i++;
			}
		}
		System.out.println(count);
	}

}

Compiler output:
Main.java:4: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		                 ^
  symbol:   class Scanner
  location: class Main
Main.java:8: error: cannot find symbol
		ArrayList<Integer> array_number = new ArrayList<>();
		^
  symbol:   class ArrayList
  location: class Main
Main.java:8: error: cannot find symbol
		ArrayList<Integer> array_number = new ArrayList<>();
		                                      ^
  symbol:   class ArrayList
  location: class Main
Main.java:14: error: cannot find symbol
		Collections.sort(array_number);
		^
  symbol:   variable Collections
  location: class Main
5 errors
Language: C++

#include<iostream>
using namespace std;
long long n,a[100002],z=1,ans=0;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    sort(a+1,a+n+1);
    for(int i=2;i<=n;i++)
    {
        if(a[i]==a[i-1])
		{
			z=(z+1)%2;
		}
        else
		{
			ans+=z;
			z=1;
		}
    }
    if(z%2==1)ans++;
    cout<<ans<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'sort' was not declared in this scope; did you mean 'short'?
    8 |     sort(a+1,a+n+1);
      |     ^~~~
      |     short
Language: C++

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

int main() {
    int n; cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; ++i) cin >> a[i];
    sort(a.begin(), a.end());
    
    int res = 0;
    for(int i = 0; i + 1 < n;) {
        int num = 1;
        if(a[i] == a[i+1]) {
            while(a[i] == a[i+1]) {
                ++num;
                ++i;
            }
        }
        if(num % 2 == 1) ++res;
        ++i;
    }
    
    cout << res << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: 'cin' was not declared in this scope
    6 |     int n; cin >> n;
      |            ^~~
a.cc:3:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    2 | #include <algorithm>
  +++ |+#include <iostream>
    3 | using namespace std;
a.cc:24:5: error: 'cout' was not declared in this scope
   24 |     cout << res << endl;
      |     ^~~~
a.cc:24:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:24:20: error: 'endl' was not declared in this scope
   24 |     cout << res << endl;
      |                    ^~~~
a.cc:3:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    2 | #include <algorithm>
  +++ |+#include <ostream>
    3 | using namespace std;
Language: C++

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

int main() {
    int n; cin >> n;
    vector<int> a(n);
    for(int i = 0; i < n; ++i) cin >> a[i];
    sort(a.begin(), a.end());
    
    int res = 0;
    for(int i = 0; i + 1 < n;) {
        int num = 1;
        if(a[i] == a[i+1]) {
            while(a[i] == a[i+1]) {
                ++num;
                ++i;
            }
        } else {
            ++i;
            continue;
        }
        if(num % 2 == 1) ++res;
    }
    
    cout << res << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: 'cin' was not declared in this scope
    6 |     int n; cin >> n;
      |            ^~~
a.cc:3:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    2 | #include <algorithm>
  +++ |+#include <iostream>
    3 | using namespace std;
a.cc:26:5: error: 'cout' was not declared in this scope
   26 |     cout << res << endl;
      |     ^~~~
a.cc:26:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:26:20: error: 'endl' was not declared in this scope
   26 |     cout << res << endl;
      |                    ^~~~
a.cc:3:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    2 | #include <algorithm>
  +++ |+#include <ostream>
    3 | using namespace std;
Language: C++

# include < cstdio >
# include < algorithm >
using namespace std ;
int N , ptr , res ;
int A [100000];
int main ()
{
scanf ( " % d " ,& N );
for ( int i =0; i < N ; i ++) scanf ( " % d " ,& A [ i ]);
sort (A , A + N );
while ( ptr < N )
{
int cc = A [ ptr ] , f =0;
while ( ptr < N && A [ ptr ]== cc ) f ++ , ptr ++;
res += f %2;
}
printf ( " % d \ n " , res );
}

Compiler output:
a.cc:1:11: fatal error:  cstdio : No such file or directory
    1 | # include < cstdio >
      |           ^~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
using namespace std;
int main(){
    int N;
    cin >> N;
    long A[N];
    for(int i=0;i<N;i++){
        cin >> A[i];
    }
    sort(A, A+N);
    int ans = 0;
    int temp = 0;
    for(int i=0;i<N-1;i++){
        temp = 1;
        int n = A[i];
        while(A[i+1]==n){
            i++;
            temp++;
        }
        ans += temp%2;
    }
    if(N==1) cout << 1 << endl;
    else
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   10 |     sort(A, A+N);
      |     ^~~~
      |     short
Language: C++

#include <iostream>
using namespace std;
int main(){
    int N;
    cin >> N;
    long A[N];
    for(int i=0;i<N;i++){
        cin >> A[i];
    }
    sort(A, A+N);
    int ans = 0;
    int temp = 0;
    for(int i=0;i<N-1;i++){
        temp = 1;
        int n = A[i];
        while(A[i+1]==n){
            i++;
            temp++;
        }
        ans += temp%2;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   10 |     sort(A, A+N);
      |     ^~~~
      |     short
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main(){
    int N;
    cin >> N;
    long A[N];
    for(int i=0;i<N;i++){
        cin >> A[i];
    }
    sort(A, A+N);
    int ans = 0;
    int temp = 0;
    for(int i=0;i<N-1;i++){
        temp = 1;
        int n = A[i];
        while(A[i+1]==n){
            i++;
            temp++;
        }
        ans += temp%2;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |     sort(A, A+N);
      |     ^~~~
      |     short
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <math.h>
#include <stdio.h>
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <stack>
#include <istream>
#include <map>
#include <set>
#include <queue>
#define rep0(i,n) for (int i = 0; i < (n); ++i)
#define rep1(i,n) for (int i = 1; i < (n); ++i)
#define REP(i,a,b) for (int i = a; i < (b); ++i) 
const long long INF = 10e9 + 7;
typedef long long ll;
using namespace std;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	/*
	/
	/
	/
	*/
	ll n;
	cin >> n;
	map<ll, ll>a;
	ll temp = 0;
	ll ans = 0;
	rep0(i, n) {
		scanf_s("%lld", &temp);
		a[temp]++;
	}
	for (auto& j : a) {
		if (j.second % 2 != 0) {
			ans++;
		}
	}
	cout << ans << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:17: error: 'scanf_s' was not declared in this scope; did you mean 'scanf'?
   36 |                 scanf_s("%lld", &temp);
      |                 ^~~~~~~
      |                 scanf
Language: C

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

int main() {
  int64_t N, A[100000] = {}, ans = 0, a;
  cin >> N;
  
  for (int i = 0; i < N; i++){
    cin >> a;
    A[a-1]++;
  }
  
  for (int64_t i = 0; i < 100000; i++){
    if (A[i] % 2 == 1){
      ans++;
    }
  }
  cout << ans << endl;
}

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define RFOR(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define REP(i,n) FOR(i,0,(n))
#define REPS(i,n) FOR(i,1,(n)+1)
#define RREP(i,n) RFOR(i,0,(n))
#define ALL(x) (x).begin(),(x).end()
#define RALL(x) (x).rbegin(),(x).rend()
#define DEBUG(x)  cout << #x << " = " << (x) << endl;
#define SORT(x) sort(ALL(x));
#define RSORT(x) sort(RALL(x));
#define SUM(x) accumulate(ALL(x),0);
#define FI first
#define SE second
#define PB push_back
#define EB emplace_back
#define SZ(x) (int)(x).size()
#define BN(x) ((1<<x)-1)
#define DUP(x,y) (((x)+(y)-1)/(y))
using namespace std;
using ll = long long;
using vi = vector<int>;
using vvi = vector<vi>;
using pii = pair<int, int>;
using tiii = tuple<int, int, int>;
const ll mod = 1e9+7;
const int INF = (1<<30)-1;
const ll INFLL = (1LL<<62)-1;
const int dx[4] = {1,0,-1,0};
const int dy[4] = {0,1,0,-1};
//cout << fixed << setprecision(10);

template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }

ll gcd(ll a, ll b) { return b ? gcd(b,a%b) : a;}
ll lcm(ll a, ll b) { return a/gcd(a,b)*b;}

int main () {
  int N; cin >> N;
  vi A(N); REP(i,N) cin >> A[i];

  //vector<bool> flag(1e9+1,false);
  bool flag[1e9+1];
  int ans = 0;
  REP(i,N) {
    if (!flag[A[i]]) {
      ans++;
      flag[A[i]] = true;
    }
    else {
      ans--;
      flag[A[i]] = false;
    }
  }

  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:44:16: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
   44 |   bool flag[1e9+1];
      |             ~~~^~
a.cc:44:16: error: could not convert '(1.0e+9 + (double)1)' from 'double' to 'long unsigned int'
   44 |   bool flag[1e9+1];
      |             ~~~^~
      |                |
      |                double
a.cc:44:16: error: size of array 'flag' has non-integral type 'double'
Language: C++

#include <cstdio > #include <algorithm > using namespace std; int N,ptr,res; int A[100000]; int main() { scanf("%d",&N); for(int i=0;i<N;i++)scanf("%d",&A[i]); sort(A,A+N); while(ptr<N) { int cc=A[ptr],f=0; while(ptr<N&&A[ptr]==cc)f++,ptr++; res+=f%2; } printf("%d\n",res);

Compiler output:
a.cc:1:20: warning: extra tokens at end of #include directive
    1 | #include <cstdio > #include <algorithm > using namespace std; int N,ptr,res; int A[100000]; int main() { scanf("%d",&N); for(int i=0;i<N;i++)scanf("%d",&A[i]); sort(A,A+N); while(ptr<N) { int cc=A[ptr],f=0; while(ptr<N&&A[ptr]==cc)f++,ptr++; res+=f%2; } printf("%d\n",res);
      |                    ^
a.cc:1:10: fatal error: cstdio : No such file or directory
    1 | #include <cstdio > #include <algorithm > using namespace std; int N,ptr,res; int A[100000]; int main() { scanf("%d",&N); for(int i=0;i<N;i++)scanf("%d",&A[i]); sort(A,A+N); while(ptr<N) { int cc=A[ptr],f=0; while(ptr<N&&A[ptr]==cc)f++,ptr++; res+=f%2; } printf("%d\n",res);
      |          ^~~~~~~~~
compilation terminated.
Language: Java

import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      Set<Integer> set = new HashSet<Inetger>();
      int n = sc.nextInt();
      for(int i = 0;i < n;i++){
      	int a = sc.nextInt();
        if(set.contains(a))set.remove(a);
        else set.add(a);
      }
      System.out.println(set.size());
    }
}

Compiler output:
Main.java:5: error: cannot find symbol
      Set<Integer> set = new HashSet<Inetger>();
                                     ^
  symbol:   class Inetger
  location: class Main
1 error
Language: Java

import java.util.*;
 
public class Main{

    public static void main(String args[]){
        Scanner sc = new Scanner(System.in);

        Map<Integer, Integer> map = new HashMap<>();
        for(int i = 0; i < N; i++){
            int N = sc.nextInt();
            if(map.containsKey(N))
                map.put(N, map.get(N)+1);
            else
                map.put(N, 1);
                sc.close();
        }
        int count = 0;
        for(Integer key: map.keySet()){
            if(map.get(key) % 2 == 1)
                count++;
        }

        System.out.println(count);
    }
}

Compiler output:
Main.java:9: error: cannot find symbol
        for(int i = 0; i < N; i++){
                           ^
  symbol:   variable N
  location: class Main
1 error
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<bits/stdc++.h>
#include<cmath>
#include<bitset>
#define ll long long
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define FFOR(i,a,b) for(int i=(a);i<=(b);++i)
#define REP(i,n)  FOR(i,0,n)
#define RREP(i,n)  FFOR(i,0,n)
#define SORT(V) sort((V).begin(),(V).end())
#define REVERSE(V) reverse((V).begin(),(V).end())
#define INF ((1LL<<62)-(1LL<<31))
#define MOD 1000000007
using namespace std;

int main(){
  ll N;
  cin>>N;
  set<ll> A;
  REP(i,N){
    ll a;
    cin>>a;
    A.push_back(a);
  }
  
  cout<<A.size()<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:7: error: 'class std::set<long long int>' has no member named 'push_back'
   26 |     A.push_back(a);
      |       ^~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
bool a[1000000001],n,num;
int main()
{
    cin>>n;
    for(int i=0;i<n;i++)
    {
        int t;
        cin>>t;
        if(a[t]==0)
        {
            a[t]=1;
            num++;
        }
        else{
            a[t]=0;
            num--;
        }
    }
    cout<<num<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:13: error: use of an operand of type 'bool' in 'operator++' is forbidden in C++17
   14 |             num++;
      |             ^~~
a.cc:18:13: error: use of an operand of type 'bool' in 'operator--' is forbidden
   18 |             num--;
      |             ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin>>N;
  vector<int64_t> a(N);
  for(int i=0;i<N;i++){
    cin>>a.at(i);
  }
  int count=0;
  sort(a.begin(),a.end());
  while(a.size()>2){
    if(a.at(0)==a.at(1)){
     a.erase(a.begin());
     a.erase(a.begin());
    }
    if(a.at(0)!=a.at(1)){
     a.erase(a.begin());
      count++;
    }
  }
  if(a.size()==2){
    if(a.at(0)!=a.at(1)){
      count++;
    }
     a.erase(a.begin());
     a.erase(a.begin());
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:28:4: error: expected '}' at end of input
   28 |   }
      |    ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin>>N;
  vector<int64_t> a(N);
  int count=0;
  while(a.size()>0){
    if(a.size()>1&&a.at(0)==a.at(1)){
     a.erase(a.begin());
      a.erase(a.begin());
    }
    else{
     erase(a.begin());
      count++;
    }
  }
       cout<<count;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:6: error: 'erase' was not declared in this scope
   14 |      erase(a.begin());
      |      ^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin>>N;
  vector<int64_t> a(N);
  int count=0;
  while(a.size()>0){
    if(a.size()>1&&a.at(0)==a.at(1)){
     erase(a.begin());
      erase(a.begin());
    }
    else{
     erase(a.begin());
      count++;
    }
  }
       cout<<count;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:6: error: 'erase' was not declared in this scope
   10 |      erase(a.begin());
      |      ^~~~~
a.cc:14:6: error: 'erase' was not declared in this scope
   14 |      erase(a.begin());
      |      ^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int N;
  cin>>N;
  vector<int64_t> a(N);
  int count=0;
  while(a.size()>0){
    if(a.size()>1&&a.at(0)==a.at(1){
     erase(a.begin());
      erase(a.begin());
    }
    else{
     erase(a.begin());
      count++;
    }
  }
       cout<<count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:36: error: expected ')' before '{' token
    9 |     if(a.size()>1&&a.at(0)==a.at(1){
      |       ~                            ^
      |                                    )
a.cc:17:3: error: expected primary-expression before '}' token
   17 |   }
      |   ^
Language: C++

N = gets.to_i
as=N.times.map{gets.to_i}
hs=Hash.new
as.each do |i|
    hs[i]=hs[i]==1 ? 0 : 1
end
p hs.inject(:+).each_slice(2).map{|i|i[1]}.inject(:+)


Compiler output:
a.cc:1:1: error: 'N' does not name a type
    1 | N = gets.to_i
      | ^
a.cc:3:1: error: 'hs' does not name a type
    3 | hs=Hash.new
      | ^~
a.cc:7:43: error: expected unqualified-id before '.' token
    7 | p hs.inject(:+).each_slice(2).map{|i|i[1]}.inject(:+)
      |                                           ^
Language: C++

// luogu-judger-enable-o2
#include<bits/stdc++.h>
using namespace std;
long long n,a[100002],z,zs;//z是出现奇数次，还是偶数次，zs是留下了多少个数
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)
      cin>>a[i];
    sort(a+1,a+n+1);//输入排序不解释
    z=1;//初值定1，方便以后运算
    for(int i=2;i<=n;i++)//因为和前一个比较，所以从2开始。
    {
        if(a[i]==a[i-1])z=(z+1)%2;//相等则加一个，看看是奇数次，还是偶数次，奇数次就还有，偶数次就没有。
        else zs+=z,z=1;//否则加上它，赋值为1。
    }
    if(z%2)zs++;//最后一次特判
    cout<<zs<<endl;//输出答案
    return 0;
}```

Compiler output:
a.cc:20:2: error: stray '`' in program
   20 | }```
      |  ^
a.cc:20:3: error: stray '`' in program
   20 | }```
      |   ^
a.cc:20:4: error: stray '`' in program
   20 | }```
      |    ^
Language: C++

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

int main() {
    int N;
    cin >> N;
    vector<long long> A(N,0);
    int ans = 0;
    int flag =0;
    for(int i = 0;i < N;i++){
        cin >> A[i];
    }
    sort(A.begin(),A.end());
    for(int i=0; i < N; i++){
        while(A[i] == A[i+1]){
            flag++:
            i++;
        }
        if(flag % 2 == 1){
            ans++;
        }

    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:19: error: expected ';' before ':' token
   16 |             flag++:
      |                   ^
      |                   ;
Language: C++

#include <iostream>
using namespace std;
long long n,a[100002],z,zs;
int main()
{
    cin>>n;
    for(int i=1;i<=n;i++)cin>>a[i];
    sort(a+1,a+n+1);
    z=1;
    for(int i=2;i<=n;i++)
    {
        if(a[i]==a[i-1])
		z=(z+1)%2;
        else
		zs+=z,z=1;
    }
    if(z%2)zs++;
    cout<<zs<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'sort' was not declared in this scope; did you mean 'short'?
    8 |     sort(a+1,a+n+1);
      |     ^~~~
      |     short
Language: Java

import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        // Your code here!
        Scanner sc = new Scanner(System.in);
        int n = Integer.parseInt(sc.next());
        HashMap<Integer, Integer> map = new HashMap<Integer, Integer>();
        for(int i=0;i<n;i++){
            int num = Integer.parseInt(sc.next());
            map.put(num, map.containsKey(num)?map.get(num)+1, 1);
        }
        int ans = 0;
        for(int i: map.keySet()){
            if(map.get(i)%2==1) ans++;
        }
        System.out.println(ans);
    }
}


Compiler output:
Main.java:11: error: : expected
            map.put(num, map.containsKey(num)?map.get(num)+1, 1);
                                                            ^
1 error
Language: C++

#include<stdio.h>
#include<algorithm>

using namespace std;

int ar[100005];

int main() {
  int n;
  scanf("%d", &n);
  for (int i = 0; i < n; i++) {
    scanf("%d", &ar[i]);
  }
  sort(ar, ar + n);
  int ans = 0;
  for (int i = 0, j = 0; i < n; i++) {
    if (i && ar[i] != ar[i-1]) {
      if (j % 2) {
        ans++;
      }
      j = 0;
    }
    j++;
  }
  if (j % 2) ans++;
  printf("%d\n", ans);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:7: error: 'j' was not declared in this scope
   25 |   if (j % 2) ans++;
      |       ^
Language: C++

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

int n;
set <int > s;

int main(){
	
	scanf("%d",&n);
	for ( int i = 0; i < n; i++ ){
		scanf("%d",&x);
		if ( s.find(x) == s.end() ) s.insert(x);
		else s.erase(s.find(x));
	}
	cout << s.size() << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:29: error: 'x' was not declared in this scope
   11 |                 scanf("%d",&x);
      |                             ^
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define endl '\n'
using namespace std;
const ll mod = 1e9+7;
const ll INF = (ll)1e18+1;

map<int, int> mp;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    #ifndef ONLINE_JUDGE
   // freopen("A.txt", "r", stdin);
    #endif
    int n, a, ans=0;
    cin >> n;
    for(int i=0; i<nl i++)
    {
        cin >> a;
        mp[a]++;
    }
    for(auto p : mp)
    {
        if(p.second%2==1) ans++;
    }
    cout << ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:20: error: 'nl' was not declared in this scope; did you mean 'n'?
   19 |     for(int i=0; i<nl i++)
      |                    ^~
      |                    n
a.cc:19:22: error: expected ';' before 'i'
   19 |     for(int i=0; i<nl i++)
      |                      ^~
      |                      ;
Language: C++

#include <iostream>
# include < algorithm >

using namespace std;

void count()
{
	int N;

	cin >> N;
	int data[100000];
	fill_n(data, 100000, 0);
	for (int i = 0; i < N; i++)
	{
		cin >> data[i];
	}
	sort(data, data + N);
	int cnt = 0;
	int meyasu = 0;
	int kazoe = 0;
	while (meyasu < N)
	{
		int kazoe = 0;
		int handan = data[meyasu];
		while (meyasu < N && handan == data[meyasu])
		{
			meyasu++;
			kazoe++;
		}
		cnt += kazoe % 2;
	}
	
	cout << cnt << endl;

}


int main()
{
	count();


}

Compiler output:
a.cc:2:11: fatal error:  algorithm : No such file or directory
    2 | # include < algorithm >
      |           ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
# include < algorithm >

using namespace std;

void count()
{
	int N;

	cin >> N;
	int data[100000];
	fill_n(data, 100000, 0);
	for (int i = 0; i < N; i++)
	{
		cin >> data[i];
	}
	sort(data, data + 100000);
	int cnt = 0;
	int meyasu = 0;
	int kazoe = 0;
	while (meyasu < N)
	{
		int kazoe = 0;
		int handan = data[meyasu];
		while (meyasu < N && handan == data[meyasu])
		{
			meyasu++;
			kazoe++;
		}
		cnt += kazoe % 2;
	}
	
	cout << cnt << endl;

}


int main()
{
	count();


}

Compiler output:
a.cc:2:11: fatal error:  algorithm : No such file or directory
    2 | # include < algorithm >
      |           ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define forn for(int i=0;i<n;i++)
int main()
{
    int n;
    string s;
    map<string,int> data;
    cin>>n;
	for(int i=1; i<=n; i++)
	{
		cin>>s;
		if(!data[s])
		{
			data[s]=1;
			ans++;
		}
		else
		{
			data[s]=0;
			ans--;
		}
	}
	cout<<ans<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   17 |                         ans++;
      |                         ^~~
      |                         abs
a.cc:22:25: error: 'ans' was not declared in this scope; did you mean 'abs'?
   22 |                         ans--;
      |                         ^~~
      |                         abs
a.cc:25:15: error: 'ans' was not declared in this scope; did you mean 'abs'?
   25 |         cout<<ans<<endl;
      |               ^~~
      |               abs
Language: C

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

int main(){
	
	int N,i,count,flag;
	scanf("%d",&N);
	int a[N];
	for(i=0;i<N;i++){
		scanf("%d",&a[i]);
	}
	sort(a,a+N);
	count = 0;
	for(i=0;i<N;i++){
		flag=1;
		while(a[i]==a[i+1]){
			flag++;
			i++;
		}
		if(flag%2==1){
			count++;
		}
	}
	printf("%d",count);
	
	/*map<int,int> mp;
	mp.clear();
	int N,x;
	scanf("%d",&N);
	for(i=1;i<=N;i++){
		scanf("%d",x);
		map[i] = x;
	}*/
	
	return 0;
} 

Compiler output:
main.c:1:10: fatal error: bits/stdc++.h: No such file or directory
    1 | #include <bits/stdc++.h>
      |          ^~~~~~~~~~~~~~~
compilation terminated.
Language: Java

#include <stdio.h>
#include <algorithm>
using namespace std;
int a[100000];
int main(){
	int N,temp,c=0;
	fill(a,a+100000,0);
	scanf("%d%*c",&N);
	while(N--){
		scanf("%d%*c",&temp);
		a[temp]+=1;
	}
	for(int i=0;i<100000;i++){
		if(a[i]%2==1){
			c++;
		}
	}
	printf("%d",c);
	return 0;
}


Compiler output:
Main.java:1: error: illegal character: '#'
#include <stdio.h>
^
Main.java:1: error: class, interface, enum, or record expected
#include <stdio.h>
         ^
Main.java:2: error: illegal character: '#'
#include <algorithm>
^
Main.java:4: error: class, interface, enum, or record expected
int a[100000];
^
Main.java:5: error: unnamed classes are a preview feature and are disabled by default.
int main(){
^
  (use --enable-preview to enable unnamed classes)
Main.java:8: error: illegal start of expression
	scanf("%d%*c",&N);
	              ^
Main.java:10: error: illegal start of expression
		scanf("%d%*c",&temp);
		              ^
7 errors
Language: C

int N,i,count,flag;
	scanf("%d",&N);
	int a[N];
	for(i=0;i<N;i++){
		scanf("%d",&a[i]);
	}
	sort(a,a+N);
	count = 0;
	for(i=0;i<N;i++){
		flag=1;
		while(a[i]==a[i+1]){
			flag++;
			i++;
		}
		if(flag%2==1){
			count++;
		}
	}
	printf("%d",count);

Compiler output:
main.c:2:15: error: expected declaration specifiers or '...' before string constant
    2 |         scanf("%d",&N);
      |               ^~~~
main.c:2:20: error: expected declaration specifiers or '...' before '&' token
    2 |         scanf("%d",&N);
      |                    ^
main.c:3:13: error: variably modified 'a' at file scope
    3 |         int a[N];
      |             ^
main.c:4:9: error: expected identifier or '(' before 'for'
    4 |         for(i=0;i<N;i++){
      |         ^~~
main.c:4:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    4 |         for(i=0;i<N;i++){
      |                  ^
main.c:4:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
    4 |         for(i=0;i<N;i++){
      |                      ^~
main.c:7:17: error: expected ')' before '+' token
    7 |         sort(a,a+N);
      |                 ^
      |                 )
main.c:8:9: warning: data definition has no type or storage class
    8 |         count = 0;
      |         ^~~~~
main.c:8:9: error: type defaults to 'int' in declaration of 'count' [-Wimplicit-int]
main.c:9:9: error: expected identifier or '(' before 'for'
    9 |         for(i=0;i<N;i++){
      |         ^~~
main.c:9:18: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    9 |         for(i=0;i<N;i++){
      |                  ^
main.c:9:22: error: expected '=', ',', ';', 'asm' or '__attribute__' before '++' token
    9 |         for(i=0;i<N;i++){
      |                      ^~
main.c:19:16: error: expected declaration specifiers or '...' before string constant
   19 |         printf("%d",count);
      |                ^~~~
main.c:19:21: error: expected declaration specifiers or '...' before 'count'
   19 |         printf("%d",count);
      |                     ^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
#define int long long
#define pb push_back
#define ub upper_bound
#define lb upper_bound
#define mp make_pair
#define F first
#define S second
#define FOR(i,a,b) for(int (i)=(a);(i)<(b);(i)++)
#define REP(i,n) FOR(i,0,n)
#define ALL(a) (a).begin(),(a).end()
#define RALL(a) (a).rbegin(),(a).rend()
#define SORT(c) sort((c).begin(),(c).end())
#define ve vector
#define vi vector<int>
#define vp vector<pair<int,int>>
#define vvi vector<vector<int>>
 
typedef long long ll;
const ll INF = LLONG_MAX - 100;
const ll mod = 1e9 + 7;
const int MAX_N = 2e5 + 5;
int dx[] = {-1,0,1,0}, dy[] = {0,1,0,-1};
vector<ll> prime;
 
int fac[MAX_N], inv[MAX_N];
 
template <class T = ll> T in() {T x; cin >> x; return (x);}
void DEBUG(vector<int> a) {for(int i=0;i<a.size();i++)cout<<a[i]<<" ";cout<<endl;}
void EMP(int x) {cout<<"!!!"<<x<<"!!!"<<endl;}
ll GCD(ll a, ll b) {ll c; while (b != 0) {c = a % b; a = b; b = c;}return a;}
ll LCM(ll a, ll b) {return a * b / GCD(a, b);}
ll POW(ll a, ll b, bool usemod = true) {ll c = 1LL; while (b > 0) {if (b & 1LL) {if(!usemod)c*=a;else c = a * c%mod;}if (!usemod) a*=a;else a = a * a%mod; b >>= 1LL;}return c;}
void _nCr() {fac[0] = 1LL; for (int i = 1LL; i < MAX_N; i++) {fac[i] = fac[i - 1LL] * i%mod;}for (int i = 0; i < MAX_N; i++) {inv[i] = POW(fac[i], mod - 2);}}
ll nCr(ll n, ll r) {return (fac[n] * inv[r] % mod)*inv[n - r] % mod;}
void PRI(ll n) {bool a[n + 1LL]; for (int i = 0; i < n + 1LL; i++) {a[i] = 1LL;}for (int i = 2; i < n + 1LL; i++) {if (a[i]) {prime.pb(i); ll b = i; while (b <= n) {a[b] = 0; b += i;}}}}
template <typename T> T chmin(T& a, T b) {if(a>b)a=b;return a;}
template <typename T> T chmax(T& a, T b) {if(a<b)a=b;return b;}

bool solve() {
	int n; cin >> n; set<int> se;
	REP (i,n) {
		int x; cin >> x;
		if (se.find(x) != se.end) {
			se.erase(x);
		} else {
			se.insert(x);
		}
	}
	cout << se.size() << endl;
}

signed main() {
	cin.tie(0);
	ios::sync_with_stdio(false);
	solve();
}

Compiler output:
a.cc: In function 'bool solve()':
a.cc:46:32: error: invalid use of non-static member function 'std::set<_Key, _Compare, _Alloc>::iterator std::set<_Key, _Compare, _Alloc>::end() const [with _Key = long long int; _Compare = std::less<long long int>; _Alloc = std::allocator<long long int>; iterator = std::_Rb_tree<long long int, long long int, std::_Identity<long long int>, std::less<long long int>, std::allocator<long long int> >::const_iterator]'
   46 |                 if (se.find(x) != se.end) {
      |                     ~~~~~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/set:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:158,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_set.h:355:7: note: declared here
  355 |       end() const _GLIBCXX_NOEXCEPT
      |       ^~~
a.cc:53:1: warning: no return statement in function returning non-void [-Wreturn-type]
   53 | }
      | ^
Language: C++

#include <iostream>
#include <cstdio>
#include <string>
#include <algorithm>
#include <cmath>
#include <vector>
#define rep(i, n) for(int i = 0; i < n; i++)
using namespace std;
typedef long long ll;

int main() {
    int N;
    cin >> N;
    rep(i, N) {
        cin >> A[i];
    }

    sort(A, A+N); 

    int t = A[0];
    int k = 0;
    int c[N];
    rep(i,N) {
        c[i] = 0;
    }   

    rep(i, N) {
        if(t < A[i]) {
            t = A[i];
            k++;
            c[k]++;
        } 
        else {
            c[k]++;
        }
    }

    int ans = 0;

    rep(i, N) {
        if(c[i]%2 == 1) {
            ans++;
        }
    }
    
    cout << ans;
    
    cout << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:16: error: 'A' was not declared in this scope
   15 |         cin >> A[i];
      |                ^
a.cc:18:10: error: 'A' was not declared in this scope
   18 |     sort(A, A+N);
      |          ^
Language: C++

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

#define rep(i,n) for(int i=0;i<n;i++)
int main(){
    ll n;
    cin >> n;

    vector<ll> a(n);
    rep(i, n)cin >> a[i];

    sort(a.begin(), a.end());
    int ans = 1;
    for(int i = 1; i < n; i++){
        ans++;
        if(a[i-1] == a[i]){
            ans-=2;;
            a[i] = 0;
        }
    }

    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   14 |     sort(a.begin(), a.end());
      |     ^~~~
      |     short
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> a;
  for(int i=0;i<N;i++){
    int x;
    cin >> x;
    bool awa=true;
    for(int j=0;j<a.size();j++){
      if(a[j]==x){
        a.erase(a.begin()+j);
        awa=false;
        break;
      }
      if(awa)a.push_back(x);
    }
  }
  cout << a.size;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:8: error: invalid use of non-static member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]'
   21 |   cout << a.size;
      |   ~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:992:7: note: declared here
  992 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> a;
  for(int i=0;i<N;i++){
    int x;
    cin >> x;
    bool awa=true;
    for(int j=0;j<a.size();j++){
      if(a[j]==x){
        a.erase(a.begin()+j);
        awa=false;
        break;
      }
      if(awa)a.push_back x;
    }
  }
  cout << a.size;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:25: error: expected ';' before 'x'
   18 |       if(awa)a.push_back x;
      |                         ^~
      |                         ;
a.cc:18:16: error: statement cannot resolve address of overloaded function
   18 |       if(awa)a.push_back x;
      |              ~~^~~~~~~~~
a.cc:21:8: error: invalid use of non-static member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]'
   21 |   cout << a.size;
      |   ~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:992:7: note: declared here
  992 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~