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

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

using namespace std;

int  main(){
    int n,sum=0;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    sort(a,a+n);
    for(int i=0;i<n;i++){
        int t=0,tmp=a[i];
        while(i<n && tmp==a[i]){
            i++;
            t++;
        }
        sum+=t%2;
    }
    cout << sum << endl;
    return 0;
}

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,a+n);
      |     ^~~~
      |     short
Language: C++

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

using namespace std;

int  main(){
    int n,sum=0;
    cin >> n;
    int a[n];
    for(int i = 0; i < n; i++){
        cin >> a[i];
    }
    sort(a.begin(),a.end());
    for(int i=0;i<n;i++){
        int t=0,tmp=a[i];
        while(i<n && tmp==a[i]){
            i++;
            t++;
        }
        sum+=t%2;
    }
    cout << sum << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:12: error: request for member 'begin' in 'a', which is of non-class type 'int [n]'
   14 |     sort(a.begin(),a.end());
      |            ^~~~~
a.cc:14:22: error: request for member 'end' in 'a', which is of non-class type 'int [n]'
   14 |     sort(a.begin(),a.end());
      |                      ^~~
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<long long> data(n);
  for(int i=0; i<n; i++) cin >> data[i];
  sort(data.begin(),data.end());
  
  int answer=0;
  while(int i<n){
    int cc=data[i],f=0;
    while(i<n && data[i] == cc){
      f++;
      i++;
    }
    answer += f%2;
  }

  cout << answer << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: expected initializer before '<' token
   12 |   while(int i<n){
      |              ^
a.cc:12:14: error: expected ')' before '<' token
   12 |   while(int i<n){
      |        ~     ^
      |              )
a.cc:12:14: error: expected primary-expression before '<' token
Language: C++

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

int main() {
  int N, M, pass = 1;
  cin >> N >> M;
  vector<int> L(M);
  vector<int> R(M);
  for (int i = 0; i < M; i++) {
    cin >> L.at(i) >> R.at(i);
  }
  sort(L.begin(), L.end());
  reverse(L.begin(), L.end());

  sort(R.begin(), R.end());
  if (L.at(0) =< R.at(0)) {
    cout << R.at(0) - L.at(0) + 1 << endl;
  }
  else {
    cout << 0 << endl;
  }
} 


Compiler output:
a.cc: In function 'int main()':
a.cc:16:16: error: expected primary-expression before '<' token
   16 |   if (L.at(0) =< R.at(0)) {
      |                ^
Language: C

#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.c:2:10: fatal error: algorithm: No such file or directory
    2 | #include <algorithm>
      |          ^~~~~~~~~~~
compilation terminated.
Language: C++

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

signed main()
{
	int n; cin >> n;
	map<int, int> a{};
	while (n--)
	{
		int tmp; cin >> tmp;

		++a[tmp];
	}

	for(auto itr: a){
		cnt += itr.second % 2;
	}

	cout << cnt << endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: 'cnt' was not declared in this scope; did you mean 'int'?
   16 |                 cnt += itr.second % 2;
      |                 ^~~
      |                 int
a.cc:19:17: error: 'cnt' was not declared in this scope; did you mean 'int'?
   19 |         cout << cnt << endl;
      |                 ^~~
      |                 int
Language: C++

import Data.List (sort)
import Control.Monad (replicateM)

main :: IO ()
main = do
    n <- readLn
    xs <- replicateM n readLn
    print $ length $ solve $ sort (xs :: [Integer])

solve :: Ord a => [a] -> [a]
solve [] = []
solve [x] = [x]
solve (x : y : xys) | x == y = solve xys
                    | otherwise = x : solve (y : xys)

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import Data.List (sort)
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: Java

import java.util.*;
class Main {
    public static void main(String[] args) {
	Scanner sc = new Scanner(System.in);
	HashSet<Long> set = new HashSet<Long>();
	int N =	Integer.parseInt(sc.next());
	for(int i = 0; i<N; i++) {
            long num = Long.parseLong(sc.next());
	    if(set.contains()) {
		set.remove(num);
            }else{
		set.add(num);
            }
        }
	System.out.println(set.size());

    }
}

Compiler output:
Main.java:9: error: method contains in class HashSet<E> cannot be applied to given types;
	    if(set.contains()) {
	          ^
  required: Object
  found:    no arguments
  reason: actual and formal argument lists differ in length
  where E is a type-variable:
    E extends Object declared in class HashSet
1 error
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <cstdlib>
using namespace std;

int main(void){
    long long N;
    cin >> N;

    vector<long long> A(N);

    for(long long i = 0;i < N; i++){
        cin >> A[i];
    }
    sort(A.begin(),A.end());
    /*
    for(long long i = 0;i < N; i++){
        cout << A[i];
    }
    */
    long long cnt = 0;
    for(long long i = 0;i < N; i += 2){
        if(i != N - 1){
            if(A[i] != A[i + 1]){
                cnt++;
                i--;
            }
        }
    }
    cout << cnt << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   16 |     sort(A.begin(),A.end());
      |     ^~~~
      |     short
Language: C++

#include<iostream>
#include<cstring>
using namespace std;
const int maxn=1e9+5;
long long a[maxn];
long long b[maxn];
int main()
{
	int n;	
	int max=-1;
	cin>>n;
	for(int i=0;i<n;i++)
	{
		cin>>a[i];
		if(max<a[i])
			max=a[i];
		if(b[a[i]]==0)
			b[a[i]]=1;
		else if(b[a[i]]==1)
			b[a[i]]=0;
	}
	int sum=0;
	for(int i=0;i<=max;i++)
		sum+=b[i];
	cout<<sum<<endl;
}

Compiler output:
/tmp/ccOH73OI.o: in function `main':
a.cc:(.text+0xbb): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccOH73OI.o
a.cc:(.text+0xeb): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccOH73OI.o
a.cc:(.text+0x11c): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccOH73OI.o
a.cc:(.text+0x14d): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccOH73OI.o
a.cc:(.text+0x189): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccOH73OI.o
collect2: error: ld returned 1 exit status
Language: C

#include<stdio.h>
#include<string.h>
#include<math.h>
const int N = 1e5+10;
int a[N];
int b[N];
int main()
{
	int n;
	memset(a,0,sizeof(a));
	scanf("%d",&n);
	int h = 0,x;
	for(int i = 0; i < n; i++){
		scanf("%d",&x); 
		a[h]++;
		b[h] = x;
		h++;
		for(int j = 0; j < h-1; j++){
			if(b[j] == x){
				a[j]++;
				h--;
				a[h]--;
			}
	}
	int ans = 0;
	for(int i = 0; i < h; i++){
		if(a[i]%2 != 0){
			ans++;
		}
	}
	printf("%d\n",ans);
	return 0;
}

Compiler output:
main.c:5:5: error: variably modified 'a' at file scope
    5 | int a[N];
      |     ^
main.c:6:5: error: variably modified 'b' at file scope
    6 | int b[N];
      |     ^
main.c: In function 'main':
main.c:33:1: error: expected declaration or statement at end of input
   33 | }
      | ^
Language: Java

import java.util.*;
//System.out.println("")

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        Long n = sc.nextLong();
        Long cnt = 0;
        Long[] a = new Long[n];
        for(Long i=0; i<n; i++){
            Long b = sc.nextLong();
            a[b] = a[b] + 1;
        }
        for(Long i=0; i<n; i++){
            if(a[i]%2 == 1){
                cnt++;
            }
        }
        System.out.println(cnt);
        
        
    }
}

Compiler output:
Main.java:8: error: incompatible types: int cannot be converted to Long
        Long cnt = 0;
                   ^
Main.java:9: error: incompatible types: Long cannot be converted to int
        Long[] a = new Long[n];
                            ^
Main.java:10: error: incompatible types: int cannot be converted to Long
        for(Long i=0; i<n; i++){
                   ^
Main.java:12: error: incompatible types: Long cannot be converted to int
            a[b] = a[b] + 1;
              ^
Main.java:12: error: incompatible types: Long cannot be converted to int
            a[b] = a[b] + 1;
                     ^
Main.java:14: error: incompatible types: int cannot be converted to Long
        for(Long i=0; i<n; i++){
                   ^
Main.java:15: error: incompatible types: Long cannot be converted to int
            if(a[i]%2 == 1){
                 ^
7 errors
Language: Java

import java.util.*;
//System.out.println("")

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int cnt = 0;
        Long[] a = new Long[n];
        for(int i=0; i<n; i++){
            Long b = sc.nextLong();
            a[b] = a[b] + 1;
        }
        for(int i=0; i<n; i++){
            if(a[i]%2 == 1){
                cnt++;
            }
        }
        System.out.println(cnt);
        
        
    }
}

Compiler output:
Main.java:12: error: incompatible types: Long cannot be converted to int
            a[b] = a[b] + 1;
              ^
Main.java:12: error: incompatible types: Long cannot be converted to int
            a[b] = a[b] + 1;
                     ^
2 errors
Language: C++

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

int main(){
  int N;
  cin >> N;
  bool p[1000000000]={};
  int A;
  for (int i=0;i<N;i++){
    cin >> A;
    p[i]=~p[i]
  }
  int ans=0;
  for (int i=0;i<1000000000;i++){
    if (p[i]) ans++;
  }
  cout << ans << endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:15: error: expected ';' before '}' token
   11 |     p[i]=~p[i]
      |               ^
      |               ;
   12 |   }
      |   ~
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:1:11: 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: C++

#include <iosteam>
#include <map>
#include <algorithm>

using namespace std;

int main(){
  int N;
  cin >> N;
  map<long long int,int> joisino;
  for(int i = 0; i < N; i++){
    long long int t;
    cin >> t;
    joisino[t]++;
  }
  
  auto iter = joisino.begin();
  int counter = 0;
  while(iter != joisino.end()){
    if(iter->second % 2 == 1) counter++;
    iter = next(iter , 1);
  }
  cout << counter;
}


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

#include <iostream>
#include <map>
#include <algorithm>

using namespace std;

int main(){
  int N;
  cin >> N;
  map<long long int,int> joisino;
  for(int i = 0; i < N; i++){
    long long int t;
    cin >> t;
    joisino[t]++;
  }
  
  auto iter = joisino.begin();
  int counter = 0;
  while(iter != joisino.end()){
    if(iter->second % 2 == 1) counter++;
    iter = next(iter , 1);
  }
  cout << couonter;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:11: error: 'couonter' was not declared in this scope; did you mean 'counter'?
   23 |   cout << couonter;
      |           ^~~~~~~~
      |           counter
Language: C++

#include <iosteam>
#include <map>
#include <algorithm>

using namespace std;

int main(){
  int N;
  cin >> N;
  map<long long int,int> joisino;
  for(int i = 0; i < N; i++){
    long long int t;
    cin >> t;
    joisino[t]++;
  }
  
  auto iter = joisino.begin();
  int counter = 0;
  while(iter != joisino.end()){
    if(iter->second % 2 == 1) counter++;
    iter = next(iter , 1);
  }
  cout << couonter;
}

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

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

int main() {
    int N;
    cin >> N;
    vector<int> A(N);
    vector<int> num(1000000010);
    for (int i=0; i<N; i++) {
        cin >> A.at(i);
    }
    for (int i=0; i<N; i++) {
        num(A.at(i))++;
    }
    int ans = 0;
    for (int i=0; num.size(); i++) {
        if (num.at(i) != 0 && num.at(i) % 2 != 0) ans++;
    }
    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:12: error: no match for call to '(std::vector<int>) (__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&)'
   13 |         num(A.at(i))++;
      |         ~~~^~~~~~~~~
Language: C++

#include<iostream>
#include<cmath>
#include<numeric>
#include<string>
#include<algorithm>
#include<vector>
#include<map>
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<n;i++)
#define int64 long long
#define yokuwaruprime (10*10*10*10*10*10*10*10*10+7)
using namespace std;

int main(){
  int n,ans=0;
  cin>>n;
  int a[n];
  rep(i,n){
    cin>>a[i];
  }
  map<int,int> mp;
  rep(i,n){
    mp[a[i]]++;
  }
  for(auto p: mp){
    if(p.second()%2!=0){
      ans++;
    }
  }
  cout<<ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:16: error: expression cannot be used as a function
   26 |     if(p.second()%2!=0){
      |        ~~~~~~~~^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
	int N;
	cin>>N;
	vector<int> vec;
	for(int i=0; i<N; i++){
		cin>>vec.at(i);
	}
	sort(vec.begin(), vec.end());
	
	int a=1,b=0,c=0;
	for(int i=0; i<N-1; i++){
		if(vec.at(i)==vec.at(i+1)){
			a++;
		}
		if else(a%2==1){
			b++;
			a=1;
		}
	}
	cout<<b<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:20: error: expected '(' before 'else'
   17 |                 if else(a%2==1){
      |                    ^~~~
      |                    (
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
	int N;
	cin>>N;
	vector<int> vec;
	for(int i=0; i<N; i++){
		cin>>vec.at(i);
	}
	sort(vec.begin(), vec.end());
	
	int a=1,b=0,c=0;
	for(int i=0; i<N-1; i++){
		if(vec.at(i)==vec.at(i+1)){
			a++;
		}
		if else(a%2==1){
			b++;
			a=1
		}
	}
	cout<<b<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:20: error: expected '(' before 'else'
   17 |                 if else(a%2==1){
      |                    ^~~~
      |                    (
Language: C++

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

int main(void){
  int N;
  cin >> N;
  vector<int> number(N);
  
  for(int i=0;i<N;i++){
    int A;
    cin >> A;
    number.at(i)=A;
  }
  sort(number.begin(),number.end());
  
  int ans=N;
  int i=0;
  while(i<N-1){
    if(number.at(i)==number.at(i+1)){
      ans-=2;
      i+=2
    }
    else i++
  }
  cout << ans << endl;
  return 0;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:22:11: error: expected ';' before '}' token
   22 |       i+=2
      |           ^
      |           ;
   23 |     }
      |     ~      
a.cc:24:13: error: expected ';' before '}' token
   24 |     else i++
      |             ^
      |             ;
   25 |   }
      |   ~
Language: C


#include <stdio.h>



int main()
{
	int N,i;
	long long int a;
	int count = 0;
	scanf("%d",&N);
	static bool s[100000009];
	for (i = 0; i < N; i++)
	{
		scanf("%lld",&a);
		if (s[a] == 0)
			s[a] = 1, count++;
		else
			s[a] = 0, count--;
	}
	printf("%d",count);

}


Compiler output:
main.c: In function 'main':
main.c:12:16: error: unknown type name 'bool'
   12 |         static bool s[100000009];
      |                ^~~~
main.c:3:1: note: 'bool' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
    2 | #include <stdio.h>
  +++ |+#include <stdbool.h>
    3 |
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long n=0,z=0,zs=0;
    long long a[100002]={0},
    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;

}

Compiler output:
a.cc:15:24: error: extended character 。 is not valid in an identifier
   15 |         else zs+=z,z=1;。
      |                        ^
a.cc: In function 'int main()':
a.cc:7:8: error: expected initializer before '>>' token
    7 |     cin>>n;
      |        ^~
a.cc:15:24: error: '\U00003002' was not declared in this scope
   15 |         else zs+=z,z=1;。
      |                        ^~
Language: C

#include<stdio.h>
const int MAX=100000;
struct xian{
	int num;
	int slm;
}xr[MAX];
int main()
{int n;
scanf("%d",&n);
int i,j;
for(i=0;i<n;i++)
{scanf("%d",&xr[i].num);
xr[i].slm=0;
}
int count=n;
for(i=0;i<n;i++)
{if(xr[i].slm==0)
{for(j=i+1;j<n;j++)
{if(xr[j].num==xr[i].num&&xr[j].slm==0){count=count-2;xr[j].slm=1;}
}
}
}
printf("%d\n",count);
return 0;
 } 

Compiler output:
main.c:6:2: error: variably modified 'xr' at file scope
    6 | }xr[MAX];
      |  ^~
Language: C

#include<stdio.h>
const int MAX=100000;
struct xian{
	int num;
	int slm;
}xr[MAX];
int main()
{int n;
scanf("%d",&n);
int i,j;
for(i=0;i<n;i++)
{scanf("%d",&xr[i].num);
xr[i].slm=0;
}
int count=n;
for(i=0;i<n;i++)
{if(xr[i].slm==0)
for(j=i+1;j<n;j++)
{if(xr[j].num==xr[i].num&&xr[j].slm==0){count=count-2;xr[j].slm=1;break;}
}
}
printf("%d\n",count);
return 0;
 } 

Compiler output:
main.c:6:2: error: variably modified 'xr' at file scope
    6 | }xr[MAX];
      |  ^~
Language: C++

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

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

    int A;
    map<int, int> number;
    for (int i = 0; i < N; i++)
    {
        cin >> A;
        if (number.find(A))
        {
            number.erace(A);
        }
        else
        {
            number[A] = 1;
        }
    }
    cout << number.size() << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:24: error: could not convert 'number.std::map<int, int>::find(A)' from 'std::map<int, int>::iterator' {aka 'std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator'} to 'bool'
   14 |         if (number.find(A))
      |             ~~~~~~~~~~~^~~
      |                        |
      |                        std::map<int, int>::iterator {aka std::_Rb_tree<int, std::pair<const int, int>, std::_Select1st<std::pair<const int, int> >, std::less<int>, std::allocator<std::pair<const int, int> > >::iterator}
a.cc:16:20: error: 'class std::map<int, int>' has no member named 'erace'; did you mean 'erase'?
   16 |             number.erace(A);
      |                    ^~~~~
      |                    erase
Language: C

#include <iostream>
#include<cstdio>
#include<cstdlib>
#include<string>
#include<map>
#include<algorithm>
using namespace std;
int main()
{
    int n;
    cin>>n;
    map<int,int>mp;
    for(int i=0;i<n;++i)
    {
        int x;
        cin>>x;
        map<int,int>::iterator it;
        it=mp.find(x);
        if(it!=mp.end())
        {
            mp[x]=0;
        }
        else mp[x]=1;
    }
    map<int,int>::iterator iter;
    iter=mp.begin();
    int cnt=0;
    while(iter!=mp.end())
    {
        if((iter->second)==1)
            ++cnt;
        ++iter;
    }
    cout<<cnt;
    return 0;
}


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

#include <iostream>
using namespace std;
bool a[100000]={false}
int main()
{
int n;
	cin>>n;
	int *p=new int[n];
	int x;
	for(int i=0;i<n;i++)
	{
		cin>>x;
		if(a[x]==false)
		a[x]=true;
		else
			a[x]=false;
	}
	int sum=0;
	for(int i=0;i<100000;i++)
	{
		if(a[i]==true)
			sum++;
	}
	cout<<sum;
return 0;
}

Compiler output:
a.cc:4:1: error: expected ',' or ';' before 'int'
    4 | int main()
      | ^~~
Language: C++

#include <iostream>
using namespace std;
int main()
{
int n;
	cin>>n;
	int *p=new int[n];
	int x;
	for(int i=0;i<n;i++)
	{
		cin>>x;
		if(a[x]==false)
		a[x]=true;
		else
			a[x]=false;
	}
	int sum=0;
	for(int i=0;i<100000;i++)
	{
		if(a[i]==true)
			sum++;
	}
	cout<<sum;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:20: error: 'a' was not declared in this scope
   12 |                 if(a[x]==false)
      |                    ^
a.cc:20:20: error: 'a' was not declared in this scope
   20 |                 if(a[i]==true)
      |                    ^
Language: C++

// malic_test_five.cpp : 定义控制台应用程序的入口点。
//

#include "stdafx.h"
#include <iostream>
#include <string>
#include <iomanip>
using namespace std;
//struct Cum
//{
//	int start;
//	int time;
//	int num;
//};


bool a[100000]={false};

int main()
{

	int n;
	cin>>n;
	int *p=new int[n];
	for(int i=0;i<100000;i++)
	{
		a[i]=false;
	}
	for(int i=0;i<n;i++)
	{
		cin>>p[i];
		if(a[p[i]]==false)
		a[p[i]]=true;
		else
			a[p[i]]=false;
	}
	int sum=0;
	for(int i=0;i<100000;i++)
	{
		if(a[i]==true)
			sum++;
	}
	cout<<sum;

		


	return 0;
}



Compiler output:
a.cc:4:10: fatal error: stdafx.h: No such file or directory
    4 | #include "stdafx.h"
      |          ^~~~~~~~~~
compilation terminated.
Language: C

#include <stdio.h>
const int maxn=10010;
int main()
{
	int n;
	int flag[maxn]={0};
	int count=0;
	scanf("%d",&n);
	int num;
	for(int i=1;i<=n;i++)
	{
		scanf("%d",&num);
		if(!flag[num])
		{
			count++;
			flag[num]=1;
		}
		else if(flag[num])
		{
			count--;
			flag[num]=0;
		}
	}
	printf("%d",count);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:24: error: variable-sized object may not be initialized except with an empty initializer
    6 |         int flag[maxn]={0};
      |                        ^
Language: C

#include <stdio.h>
const int maxn=1000000000;
int main()
{
	int n;
	int flag[maxn]={0};
	int count=0;
	scanf("%d",&n);
	int num;
	for(int i=0;i<n;i++)
	{
		scanf("%d",&num);
		if(!flag[num])
		{
			count++;
			flag[num]=1;
		}
		else if(flag[num])
		{
			count--;
			flag[num]=0;
		}
	}
	printf("%d",count);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:24: error: variable-sized object may not be initialized except with an empty initializer
    6 |         int flag[maxn]={0};
      |                        ^
Language: C

#include<iostream>
using namespace std;
int main()
{
	 int N,b,num=0;
	 cin>>N;
	 int*a;
	 a=new int[N];
	 for(int i=0;i<N;i++)
	 a[i]=0;
	 for(int i=0;i<N;i++)
	 {
	 	int ok=0;
	 	cin>>b;
	 	for(int i=0;i<N;i++)
	 	if(a[i]==b)
	 	{
	 		a[i]=0;
	 		ok=1;
	 		break;
		}
		if(!ok)
		a[i]=b;
	 }
	 for(int i=0;i<N;i++)
	 {
	 	if(a[i])
	 	num++;
	 }
	 cout<<num<<endl;
	 return 0;
}

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

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <cmath>
#include <unordered_map>
 
using namespace std;
using ll = long long;
 
void _cin(){} template <class Head, class... Tail> void _cin(Head&& head, Tail&&... tail){ cin >> head; _cin(forward<Tail>(tail)...); }
void _cout(){ cout << "\n"; } template <class Head, class... Tail> void _cout(Head&& head, Tail&&... tail){ cout << head; _cout(forward<Tail>(tail)...); }
int gcd(int a, int b){ return (b == 0) ? a : gcd(b, a % b); }
 
#define For(i, n) for(int i = 0; i < (n); i ++)
#define Rep(n) For(_, n)
#define Range(c) c.begin(), c.end()
#define RevRange(c) c.rbegin(), c.rend()
#define Contains(c, x) (find(Range(c), x) != c.end())
#define Search(rb, re, x) distance(rb, find(rb, re, x))
#define Sort(a) sort(Range(a))
#define DeSort(a) sort(RevRange(a))
#define Unique(a) a.erase(unique(Range(a)), a.end());
#define Reverse(c) reverse(Range(c))
#define Vec2(T, n, m, xs) vector<vector<T>> xs(n, vector<T>(m))
#define Sum(a) accumulate(Range(a), 0)
#define Cusum(T, n, xs, sxs) vector<T> sxs(n+1); For(i, n) sxs[i+1] = sxs[i] + xs[i]
#define Cin(T, ...) T __VA_ARGS__; _cin(__VA_ARGS__)
#define Cins(T, n, xs) vector<T> xs(n); For(i, n) cin >> xs[i]
#define Cins2(T, n, xs, ys) vector<T> xs(n), ys(n); For(i, n) cin >> xs[i] >> ys[i]
#define Cins3(T, n, xs, ys, zs) vector<T> xs(n), ys(n), zs(n); For(i, n) cin >> xs[i] >> ys[i] >> zs[i]
#define Cinss(T, n, m, xs) Vec2(T, n, m, xs); For(i, n) For(j, m) cin >> xs[i][j]
#define Cinm(T, n, map) unordered_map<T, int> map; Rep(n){ Cin(T, x); map[x] ++; }
#define Cout(...) _cout(__VA_ARGS__)
#define Couts(xs) for(const auto &e : xs) cout << e << " "; cout << "\n"
#define Coutyn(cond) Cout((cond) ? "yes" : "no")
#define CoutYn(cond) Cout((cond) ? "Yes" : "No")
#define CoutYN(cond) Cout((cond) ? "YES" : "NO")

int main(void){
    Cin(int, n);
    Cinm(int, n, m);
    int ans = 0;
    for(int e : m) if(e.second % 2) ans ++;
    Cout(ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:45:17: error: cannot convert 'std::pair<const int, int>' to 'int' in initialization
   45 |     for(int e : m) if(e.second % 2) ans ++;
      |                 ^
a.cc:45:25: error: request for member 'second' in 'e', which is of non-class type 'int'
   45 |     for(int e : m) if(e.second % 2) ans ++;
      |                         ^~~~~~
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <numeric>
#include <cmath>
#include <unordered_map>
 
using namespace std;
using ll = long long;
 
void _cin(){} template <class Head, class... Tail> void _cin(Head&& head, Tail&&... tail){ cin >> head; _cin(forward<Tail>(tail)...); }
void _cout(){ cout << "\n"; } template <class Head, class... Tail> void _cout(Head&& head, Tail&&... tail){ cout << head; _cout(forward<Tail>(tail)...); }
int gcd(int a, int b){ return (b == 0) ? a : gcd(b, a % b); }
 
#define For(i, n) for(int i = 0; i < (n); i ++)
#define Rep(n) For(_, n)
#define Range(c) c.begin(), c.end()
#define RevRange(c) c.rbegin(), c.rend()
#define Contains(c, x) (find(Range(c), x) != c.end())
#define Search(rb, re, x) distance(rb, find(rb, re, x))
#define Sort(a) sort(Range(a))
#define DeSort(a) sort(RevRange(a))
#define Unique(a) a.erase(unique(Range(a)), a.end());
#define Reverse(c) reverse(Range(c))
#define Vec2(T, n, m, xs) vector<vector<T>> xs(n, vector<T>(m))
#define Sum(a) accumulate(Range(a), 0)
#define Cusum(T, n, xs, sxs) vector<T> sxs(n+1); For(i, n) sxs[i+1] = sxs[i] + xs[i]
#define Cin(T, ...) T __VA_ARGS__; _cin(__VA_ARGS__)
#define Cins(T, n, xs) vector<T> xs(n); For(i, n) cin >> xs[i]
#define Cins2(T, n, xs, ys) vector<T> xs(n), ys(n); For(i, n) cin >> xs[i] >> ys[i]
#define Cins3(T, n, xs, ys, zs) vector<T> xs(n), ys(n), zs(n); For(i, n) cin >> xs[i] >> ys[i] >> zs[i]
#define Cinss(T, n, m, xs) Vec2(T, n, m, xs); For(i, n) For(j, m) cin >> xs[i][j]
#define Cinm(T, n, map) unordered_map<T, int> map; Rep(n){ Cin(T, x); map[x] ++; }
#define Cout(...) _cout(__VA_ARGS__)
#define Couts(xs) for(const auto &e : xs) cout << e << " "; cout << "\n"
#define Coutyn(cond) Cout((cond) ? "yes" : "no")
#define CoutYn(cond) Cout((cond) ? "Yes" : "No")
#define CoutYN(cond) Cout((cond) ? "YES" : "NO")

int main(void){
    Cin(int, n);
    Cinm(int, n, m);
    int ans = 0;
    for(int e : m) if(e % 2) ans ++;
    Cout(ans);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:45:17: error: cannot convert 'std::pair<const int, int>' to 'int' in initialization
   45 |     for(int e : m) if(e % 2) ans ++;
      |                 ^
Language: C++

#include <iostream>
#include <unordered_set>

int main() {
    int n;
    cin >> n;
    unordered_set<int> st;
    for (int i = 0; i < n; i++) {
        int a;
        cin >> a;
        if (st.find(a) == st.end())
            st.insert(a);
        else
            st.erase(a);
    }
    cout << st.size() << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |     cin >> n;
      |     ^~~
      |     std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:5: error: 'unordered_set' was not declared in this scope
    7 |     unordered_set<int> st;
      |     ^~~~~~~~~~~~~
a.cc:7:5: note: suggested alternatives:
In file included from /usr/include/c++/14/unordered_set:41,
                 from a.cc:2:
/usr/include/c++/14/bits/unordered_set.h:104:11: note:   'std::unordered_set'
  104 |     class unordered_set
      |           ^~~~~~~~~~~~~
/usr/include/c++/14/unordered_set:65:13: note:   'std::pmr::unordered_set'
   65 |       using unordered_set
      |             ^~~~~~~~~~~~~
a.cc:7:19: error: expected primary-expression before 'int'
    7 |     unordered_set<int> st;
      |                   ^~~
a.cc:11:13: error: 'st' was not declared in this scope; did you mean 'std'?
   11 |         if (st.find(a) == st.end())
      |             ^~
      |             std
a.cc:16:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |     cout << st.size() << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:16:13: error: 'st' was not declared in this scope; did you mean 'std'?
   16 |     cout << st.size() << endl;
      |             ^~
      |             std
a.cc:16:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   16 |     cout << st.size() << endl;
      |                          ^~~~
      |                          std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(){
    vector<ll> ar;
    int n;
    cin >> n;
    ll tmp;
    ll hoge; cin >> hoge; ar.push_back(hoge);
    for(int i=1;i!=n;i++){
    ll hoge; cin >> hoge; ar.push_back(hoge);
  }
  int ans=1;
  sort(ar.begin(),ar.end());
  int tmp=0;
  for(int i=0;i!=n;i++){
    if(tmp!=ar.at(i)){
      ans++;
      tmp=ar.at(i);
    }
    else{
      tmp=0;
    }
  }
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:7: error: conflicting declaration 'int tmp'
   17 |   int tmp=0;
      |       ^~~
a.cc:10:8: note: previous declaration as 'll tmp'
   10 |     ll tmp;
      |        ^~~
Language: C++

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(){
  vector<int> ar;
  int n;
  cin >> n;
  int tmp;
  cin >> ar[0];
  for(int i=1;i!=n;i++){
    cin >> tmp;
    auto itr = find(ar.begin(),ar.end(),tmp);
    if(itr==ar.end()){
      ar[i]=tmp;
    }
    else{
      erase(itr);
      n--;
      i--;
    }
  }
  cout << ar.size() << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:7: error: 'erase' was not declared in this scope
   19 |       erase(itr);
      |       ^~~~~
Language: C++

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

int main()
{
    int n,i,temp = 0,count = 0;
    cin >> n;
    vector<int> a(n);
    for(i = 0;i <n;++i){
        cin >> a.at(i);
    }
    sort(a.begin(),a.end());
    int ans = 0;
    for(i = 0;i < n;++i){
        if(a.at(i) != temp){
            temp = a.at(i);
            ans += count%2;
            count = 1;
        }else{
            ++count;
        }
    }
    ans += count%2
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:19: error: expected ';' before 'cout'
   25 |     ans += count%2
      |                   ^
      |                   ;
   26 |     cout << ans << endl;
      |     ~~~~
Language: C++

//
//  main.cpp
//  ABC073-c
//
//  Created by hiroaki on 2019/02/10.
//  Copyright © 2019年 hiroaki. All rights reserved.
//

#include <iostream>
#include <vector>
#include <iterator>
using namespace std;

int flag(int x,vector<int> v){//要素xの有無
    int flag=0;
    for (int i=0; i<v.size(); i++) {
        if (v[i]==x) {
            flag=1;
        }
    }
    return flag;
}

int main() {
    int N;
    cin>>N;
    vector<int> A;
    for (int i=0; i<N; i++) {
        int x;
        cin>>x;
        A.push_back(x);
    }
    vector<int> write;
    for (int i=0; i<N; i++) {
        if (flag(A[i], write)==1) {
            int q=A[i];
            remove(write.begin(), write.end(),q);
            write.erase(remove(write.begin(), write.end(),q),write.end());
        }else{
            write.push_back(A[i]);
        }
    }
    cout<<write.size()<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:37:31: error: cannot convert 'std::vector<int>::iterator' to 'const char*'
   37 |             remove(write.begin(), write.end(),q);
      |                    ~~~~~~~~~~~^~
      |                               |
      |                               std::vector<int>::iterator
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:9:
/usr/include/stdio.h:158:32: note:   initializing argument 1 of 'int remove(const char*)'
  158 | extern int remove (const char *__filename) __THROW;
      |                    ~~~~~~~~~~~~^~~~~~~~~~
a.cc:38:43: error: cannot convert 'std::vector<int>::iterator' to 'const char*'
   38 |             write.erase(remove(write.begin(), write.end(),q),write.end());
      |                                ~~~~~~~~~~~^~
      |                                           |
      |                                           std::vector<int>::iterator
/usr/include/stdio.h:158:32: note:   initializing argument 1 of 'int remove(const char*)'
  158 | extern int remove (const char *__filename) __THROW;
      |                    ~~~~~~~~~~~~^~~~~~~~~~
Language: C++

//
//  main.cpp
//  ABC073-c
//
//  Created by hiroaki on 2019/02/10.
//  Copyright © 2019年 hiroaki. All rights reserved.
//

#include <iostream>
#include <vector>
#include <iterator>
using namespace std;

int flag(int x,vector<int> v){//要素xの有無
    int flag=0;
    for (int i=0; i<v.size(); i++) {
        if (v[i]==x) {
            flag=1;
        }
    }
    return flag;
}

int main() {
    int N;
    cin>>N;
    vector<int> A;
    for (int i=0; i<N; i++) {
        int x;
        cin>>x;
        A.push_back(x);
    }
    vector<int> write;
    for (int i=0; i<N; i++) {
        if (flag(A[i], write)==1) {
            int q=A[i];
            auto r=remove(write.begin(), write.end(),q);
            write.erase(r,write.end());
        }else{
            write.push_back(A[i]);
        }
    }
    /*for (int i=0; i<write.size(); i++) {
        cout<<write[i]<<"\t"<<endl;
    }*/
    cout<<write.size()<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:37:38: error: cannot convert 'std::vector<int>::iterator' to 'const char*'
   37 |             auto r=remove(write.begin(), write.end(),q);
      |                           ~~~~~~~~~~~^~
      |                                      |
      |                                      std::vector<int>::iterator
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:9:
/usr/include/stdio.h:158:32: note:   initializing argument 1 of 'int remove(const char*)'
  158 | extern int remove (const char *__filename) __THROW;
      |                    ~~~~~~~~~~~~^~~~~~~~~~
Language: C++

//
//  main.cpp
//  ABC073-c
//
//  Created by hiroaki on 2019/02/10.
//  Copyright © 2019年 hiroaki. All rights reserved.
//

#include <iostream>
#include <vector>
#include <iterator>
using namespace std;

int flag(int x,vector<int> v){//要素xの有無
    int flag=0;
    for (int i=0; i<v.size(); i++) {
        if (v[i]==x) {
            flag=1;
        }
    }
    return flag;
}

int main() {
    int N;
    cin>>N;
    vector<int> A;
    for (int i=0; i<N; i++) {
        int x;
        cin>>x;
        A.push_back(x);
    }
    vector<int> write;
    for (int i=0; i<N; i++) {
        if (flag(A[i], write)==1) {
            auto r=remove(write.begin(), write.end(), A[i]);
            write.erase(r,write.end());
        }else{
            write.push_back(A[i]);
        }
    }
    /*for (int i=0; i<write.size(); i++) {
        cout<<write[i]<<"\t"<<endl;
    }*/
    cout<<write.size()<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:38: error: cannot convert 'std::vector<int>::iterator' to 'const char*'
   36 |             auto r=remove(write.begin(), write.end(), A[i]);
      |                           ~~~~~~~~~~~^~
      |                                      |
      |                                      std::vector<int>::iterator
In file included from /usr/include/c++/14/cstdio:42,
                 from /usr/include/c++/14/ext/string_conversions.h:45,
                 from /usr/include/c++/14/bits/basic_string.h:4154,
                 from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:9:
/usr/include/stdio.h:158:32: note:   initializing argument 1 of 'int remove(const char*)'
  158 | extern int remove (const char *__filename) __THROW;
      |                    ~~~~~~~~~~~~^~~~~~~~~~
Language: C++

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

 
int main(){
    int N;
    int a[100100];
    int count[1001000000] = 0;
    cin >> N;
    for (int i = 0; i < N; ++i) cin >> a[i] ;
    
    sort(a, a + N);

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

    int ans = 0;

    for (int i = 0; i < a[N]; ++i){
        if(count[a[i]] % 2 == 1){
            ++ans;
        }
    }

    cout << ans << endl;
    

    
   
}
 


Compiler output:
a.cc: In function 'int main()':
a.cc:9:29: error: array must be initialized with a brace-enclosed initializer
    9 |     int count[1001000000] = 0;
      |                             ^
Language: C++

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

 
int main(){
    int N;
    int a[100100];
    int count[1001000000];
    cin >> N;
    for (int i = 0; i < N; ++i) cin >> a[i] ;
    
    sort(a, a + N);

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

    int ans = 0;

    for (int i = 0; i < a[N]; ++i;){
        if(count[a[i]] % 2 == 1){
            ++ans;
        }
    }

    cout << ans << endl;
    

    
   
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:31: error: expected ')' before ';' token
   15 |     for (int i = 0; i < N; ++i;){
      |         ~                     ^
      |                               )
a.cc:15:32: error: expected primary-expression before ')' token
   15 |     for (int i = 0; i < N; ++i;){
      |                                ^
a.cc:23:34: error: expected ')' before ';' token
   23 |     for (int i = 0; i < a[N]; ++i;){
      |         ~                        ^
      |                                  )
a.cc:23:35: error: expected primary-expression before ')' token
   23 |     for (int i = 0; i < a[N]; ++i;){
      |                                   ^
Language: C++

#include<iostream> 
#include<string> 
#include<vector> 
#include<algorithm> 
#include<cmath>
#include<set>
#include<utility>

using namespace std;


int main()
{
	int n;
	cin >> n;
	vector<long long int> a(n);
	;
	for (int i = 0; i <n; i++)
	{
		cin >> a[i];
		
	}
	
	sort(a.begin(), a.end());
	long long int ans = 0;
	loog long int k = 0;
	for (int i = 0; i < n; i++)
	{
		if (i == 0)
		{
			k++;
		}
		else
		{
			if (a[i] == a[i - 1])
			{
				k++;
			}
			else
			{
				if (k % 2 == 1)
				{
					ans++;
				}
				k = 1;
			}
		}
		

	}

	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:9: error: 'loog' was not declared in this scope; did you mean 'long'?
   26 |         loog long int k = 0;
      |         ^~~~
      |         long
a.cc:31:25: error: 'k' was not declared in this scope
   31 |                         k++;
      |                         ^
a.cc:37:33: error: 'k' was not declared in this scope
   37 |                                 k++;
      |                                 ^
a.cc:41:37: error: 'k' was not declared in this scope
   41 |                                 if (k % 2 == 1)
      |                                     ^
a.cc:45:33: error: 'k' was not declared in this scope
   45 |                                 k = 1;
      |                                 ^
Language: C++

#include <iostream>
#include <vector>

using namespace std;
typedef long long ll;

int main(int argc, const char *argv[])
{
    ll N, a;
    vector<ll> v;
    cin >> N;

    for (int i = 0; i < N; i++)
    {
        cin >> a;
        vector<ll>::iterator b = find(v.begin(), v.end(), a);
        if(b != v.end()){
            v[distance(v.begin(), b)] = v.back();
            v.pop_back();
        }else{
            v.push_back(a);
        }
    }

    cout << v.size() << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:16:38: error: no matching function for call to 'find(std::vector<long long int>::iterator, std::vector<long long int>::iterator, ll&)'
   16 |         vector<ll>::iterator b = find(v.begin(), v.end(), a);
      |                                  ~~~~^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/bits/locale_facets.h:48,
                 from /usr/include/c++/14/bits/basic_ios.h:37,
                 from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/streambuf_iterator.h:435:5: note: candidate: 'template<class _CharT2> typename __gnu_cxx::__enable_if<std::__is_char<_CharT2>::__value, std::istreambuf_iterator<_CharT> >::__type std::find(istreambuf_iterator<_CharT>, istreambuf_iterator<_CharT>, const _CharT2&)'
  435 |     find(istreambuf_iterator<_CharT> __first,
      |     ^~~~
/usr/include/c++/14/bits/streambuf_iterator.h:435:5: note:   template argument deduction/substitution failed:
a.cc:16:38: note:   '__gnu_cxx::__normal_iterator<long long int*, std::vector<long long int> >' is not derived from 'std::istreambuf_iterator<_CharT>'
   16 |         vector<ll>::iterator b = find(v.begin(), v.end(), a);
      |                                  ~~~~^~~~~~~~~~~~~~~~~~~~~~~
Language: C++

N = int(input())
A = {}
for _ in range(N):
    a = int(input())
    if a not in A:
        A[a] = 1
    else:
        A[a] += 1
cnt = 0
for v in A.values():
    cnt += v%2
print(cnt)

Compiler output:
a.cc:1:1: error: 'N' does not name a type
    1 | N = int(input())
      | ^
a.cc:3:1: error: expected unqualified-id before 'for'
    3 | for _ in range(N):
      | ^~~
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:9:5: error: 'sort' was not declared in this scope; did you mean 'short'?
    9 |     sort(a+1,a+n+1);
      |     ^~~~
      |     short
Language: C++

#include<iostream>
#include<algorithm>
#include<cstdio>
#include<cmath>
#include<queue>
#include<cstring>
#include<vector>

using namespace std;

typedef long long ll;

int main(){
  int n,cnt=0,ans=0

Compiler output:
a.cc: In function 'int main()':
a.cc:14:20: error: expected ',' or ';' at end of input
   14 |   int n,cnt=0,ans=0
      |                    ^
a.cc:14:20: error: expected '}' at end of input
a.cc:13:11: note: to match this '{'
   13 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n,a,c=0;
  cin>>n;
  map<int,int> m;
  for(int i=0;i<n;i++){
    cin>>a;
    m[a]++:
  }
  for(auto t:m){
    if(t.second%2==1) c++;
  }
  cout<<c;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: expected ';' before ':' token
    9 |     m[a]++:
      |           ^
      |           ;
Language: C++

#include<bits/stdc++.h>

using namespace std;

int main()
{
	int N,A[100010]={};
	int ans=0;	
	cin >> N;
	for(int i=0;i<N;i++{
		cin >> A[i];
	}	
	sort(A,A+N);	
	int cnt=0;
	for(int i=0;i<N;i++){
		cnt++;
		if(A[i]!=A[i+1]){
			ans+=(cnt%2);
			cnt=0;
		}
	}
	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:28: error: expected ')' before '{' token
   10 |         for(int i=0;i<N;i++{
      |            ~               ^
      |                            )
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
using namespace std;
int main(){
    int n;
    cin >> n;
    vector<long long> a(n);
    for(int i=0;i<n;i++){
        cin >> a[i];
    }
    int ans=0;
    int count=1;
    sort(a.begin(),a.end());
    for(int i=1;i<n;i++){
        if(a[i]==a[i-1]){
            count++;
        }else{
            if(count%2!=0){
                ans++;
            }
            count=1;
    }
    if(n==1){
        ans = 1;
    }
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:29:2: error: expected '}' at end of input
   29 | }
      |  ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^