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

#include <iostream>
#include <cstdlib>

using namespace std;

#define max_n 100000

int main(){
  int n;
  int a[max_n];
  cin >> n;
  for(j=0; j<n; j++){
    int input;
    cin >> input;
    bool is_there = false;
    for(i=0; i<end; i++){
      if(a[i] == input){
        is_there = true;
        break;
      }
    }
    if(!is_there){
      end++;
      a[i] = input;
      b[i] = 1;
    } else {
      b[i]++;
    }
  }

  int ret = 0;
  for(i=0; i<end; i++){
    if(b[i] % 2 == 1){
      ret++;
    }
  }
  cout << ret << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:7: error: 'j' was not declared in this scope
   12 |   for(j=0; j<n; j++){
      |       ^
a.cc:16:9: error: 'i' was not declared in this scope
   16 |     for(i=0; i<end; i++){
      |         ^
a.cc:23:10: error: no post-increment operator for type
   23 |       end++;
      |          ^~
a.cc:24:9: error: 'i' was not declared in this scope
   24 |       a[i] = input;
      |         ^
a.cc:25:7: error: 'b' was not declared in this scope
   25 |       b[i] = 1;
      |       ^
a.cc:27:7: error: 'b' was not declared in this scope
   27 |       b[i]++;
      |       ^
a.cc:27:9: error: 'i' was not declared in this scope
   27 |       b[i]++;
      |         ^
a.cc:32:7: error: 'i' was not declared in this scope
   32 |   for(i=0; i<end; i++){
      |       ^
a.cc:33:8: error: 'b' was not declared in this scope
   33 |     if(b[i] % 2 == 1){
      |        ^
Language: C

#include<stdio.h>
int main(){
	int N;
	scanf("%d",&N);
	int in[N],temp,key=0;
	for(int i=0;i<N;i++){
		scanf("%d",&temp);
		for(int j=0;j<N;j++){
			if(in[j]!=temp){
				if(j==N-1){
					in[key]=temp;
					key++;
				}
			}
			else if(in[j]==temp){
				key=j;
				in[j]==NULL;
			}
		}
	}
	key=0;
	for(int i=0;i<N;i++){
		if(in[j]!=NULL)
			key++;
	}
	printf("%d\n",key);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:17:38: warning: comparison between pointer and integer
   17 |                                 in[j]==NULL;
      |                                      ^~
main.c:23:23: error: 'j' undeclared (first use in this function)
   23 |                 if(in[j]!=NULL)
      |                       ^
main.c:23:23: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(){
	int N;
	scanf("%d",&N);
	int in[N],temp,key=0;
	for(int i=0;i<N;i++){
		scanf("%d",&temp);
		for(int j=0;j<N;j++){
			if(in[j]!=temp){
				if(j==N-1){
					in[key]=temp;
					key++;
				}
			}
			else if(in[j]==temp){
				key=j;
				in[j]==NULL;
			}
		}
	}
	key=0;
	for(int i=0;i<N;i++){
		if(in[j]!=NULL)
			key++;
	}
	printf("%d\n",key);
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:17:38: warning: comparison between pointer and integer
   17 |                                 in[j]==NULL;
      |                                      ^~
main.c:23:23: error: 'j' undeclared (first use in this function)
   23 |                 if(in[j]!=NULL)
      |                       ^
main.c:23:23: note: each undeclared identifier is reported only once for each function it appears in
main.c: At top level:
main.c:28:9: error: expected identifier or '(' before 'return'
   28 |         return 0;
      |         ^~~~~~
main.c:29:1: error: expected identifier or '(' before '}' token
   29 | }
      | ^
Language: C++

#include <iostream>
using namespace std;

int main(int argc, const char * argv[]) {
    // insert code here...
    int N;
    cin >> N;
    int l[N];
    int count = 0;
    
    for(int i = 0; i < N; i++) {
        cin >> l[i];
    }
    
    sort(l,l+N);
    
    for(int i = 0; i < N;) {
        if (l[i] == l[i+1]) {
            i += 2;
        } else {
            count++;
            i++;
        }
    }
    
    cout << count << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:15:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   15 |     sort(l,l+N);
      |     ^~~~
      |     short
Language: C++

#include <bits/stdc++.h>
using namespace std;
using ll=long long;
void NO(){cout<<"NO"<<endl;exit(0);}
ll gcd(ll x,ll y){return y==0?1:gcd(y,x%y);}
ll lcm(ll x, ll y){return x/gcd(x,y)*y;}
int main(){
ll n;cin>>n;map<ll,ll>m;for(int i=0;i<n;++i){ll x;cin>>x;m[x]++;}ll a=0;for(auto&p:m)if(m.second%2)++a;cout<<a<<endl;
return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:91: error: 'class std::map<long long int, long long int>' has no member named 'second'
    8 | ll n;cin>>n;map<ll,ll>m;for(int i=0;i<n;++i){ll x;cin>>x;m[x]++;}ll a=0;for(auto&p:m)if(m.second%2)++a;cout<<a<<endl;
      |                                                                                           ^~~~~~
Language: C++

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

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 ans = 0;
    int last;
    int x = 0;
    for (int i = 0; i < n - 1; i++) {
        if (a[i] == a[i + 1]) {
            x++;
        } else {
            if (x % 2 == 0) ans++;
            x = 0;
        }
    }

    if (a[i] != a[i + 1]) ans++;

    if (n == 1) {
        cout << 1 << "\n";
    } else {
        cout << ans << "\n";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:33:11: error: 'i' was not declared in this scope
   33 |     if (a[i] != a[i + 1]) ans++;
      |           ^
Language: C++

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

int *n;
int ans=0;
int N,i;


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

    sort(n,n+N);

    while(i<N){
        int cnt,next=n[i];
        while(i<N && n[i]==next){
            cnt++;
            i++;
        }
        ans+=cnt%2;
    }

    cout<<ans<<endl;
    

Compiler output:
a.cc: In function 'int main()':
a.cc:28:21: error: expected '}' at end of input
   28 |     cout<<ans<<endl;
      |                     ^
a.cc:10:11: note: to match this '{'
   10 | int main(){
      |           ^
Language: C++

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

int *n;
int ans=0;
int N,i;


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

    sort(n,n+N);

    while(i<N){
        int cnt,next=n[i];
        while(i<N && n[i]==next){
            cnt++;
            i++;
        }
        ans+=cnt%2;
    }

    cout<<ans<<endl;
    delete[]n;
    return 0;

}

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

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

int *n;
int ans=0;
int N;


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

    sort(n,n+N);

    while(i<N){
        int cnt,next=n[i];
        while(i<N && n[i]==next){
            cnt++;
            i++;
        }
        ans+=cnt%2;
    }

    cout<<ans<<endl;

}

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

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

using namespace std;

int a[1000000001];

int main() {
    int n;
    int x;
    int ans = 0;

    memset(a, 0, sizeof(a));

    cin >> n;

    vector< int > b(n);

    for (int i = 0; i < n; i++) {
        cin >> b[i];
        a[b[i]] += 1;
    }

    for (int i = 0; i < n; i++) {
        ans += a[b[i]] % 2;
    }

    cout << ans << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'memset' was not declared in this scope
   14 |     memset(a, 0, sizeof(a));
      |     ^~~~~~
a.cc:4:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    3 | #include <vector>
  +++ |+#include <cstring>
    4 |
Language: C++

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

using namespace std;

itn a[1000000000];

int main() {
    int n;
    vector< int > b(n);
    int x;
    int ans = 0;

    cin >> n;

    for (int i = 0; i < n; i++) {
        cin >> b[i];
        a[b[i]] += 1;
    }

    for (int i = 0; i < n; i++) {
        ans += a[b[i]] % 2;
    }

    cout << ans << "\n";
}

Compiler output:
a.cc:7:1: error: 'itn' does not name a type; did you mean 'int'?
    7 | itn a[1000000000];
      | ^~~
      | int
a.cc: In function 'int main()':
a.cc:19:9: error: 'a' was not declared in this scope
   19 |         a[b[i]] += 1;
      |         ^
a.cc:23:16: error: 'a' was not declared in this scope
   23 |         ans += a[b[i]] % 2;
      |                ^
Language: C++

#include<iostream>
using namespace std;

int N;
bool A[1000000000];


int main(){
  for(int i=0;i<1000000000;i++)A[i]=false;

  int ans=0;
  cin>>N;
  for(int i=0;i<N;i++){
    int a;
    cin>>a;
    if(A[a]){
      A[a]=false;
      ans-=1;
    }
    else 
    {
      A[a]=true;
      ans+=1;
  }
  cout<<ans<<endl;
}
 

Compiler output:
a.cc: In function 'int main()':
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:8:11: note: to match this '{'
    8 | int main(){
      |           ^
Language: C++

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

int main()
{
  int N;
  scanf("%d", &N);
  int A[N];

  for (int i = 0; i < N; i++) {
    scanf("%d", &A[i]);
  }
  sort(A, A+N);

  int temp = A[0];
  int res = 0, count = 0;
  for (int i = 1; i < N; i++) {
    if (temp == A[i]) res++; res += res % 2;
    else {
      temp = A[i];
      count += res;
    }
  }

  printf("%d\n", count);

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:5: error: 'else' without a previous 'if'
   20 |     else {
      |     ^~~~
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
 
int main()
{
int N, A[100000], locate, total = 0;
cin >> N;
for(int i = 0; i < N; i++) cin >>A[i];
sort(A, A+N);
 
while(locate < N){
int num = A[locate], cnt = 0;
while(locate < N && A[locate] == num) cnt++, locate++;
total += cnt %2
}
cout << total << endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:16: error: expected ';' before '}' token
   15 | total += cnt %2
      |                ^
      |                ;
   16 | }
      | ~
Language: C++

int N;
//---------------------------------------------------------------------------------------------------
void _main() {
    cin >> N;
    set<int> s;
    rep(i, 0, N) {
        int x; cin >> x;
 
        if (s.count(x)) s.erase(x);
        else s.insert(x);
    }
    cout << s.size() << endl;
}

Compiler output:
a.cc: In function 'void _main()':
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> N;
      |     ^~~
a.cc:5:5: error: 'set' was not declared in this scope
    5 |     set<int> s;
      |     ^~~
a.cc:5:9: error: expected primary-expression before 'int'
    5 |     set<int> s;
      |         ^~~
a.cc:6:9: error: 'i' was not declared in this scope
    6 |     rep(i, 0, N) {
      |         ^
a.cc:6:5: error: 'rep' was not declared in this scope
    6 |     rep(i, 0, N) {
      |     ^~~
a.cc:12:5: error: 'cout' was not declared in this scope
   12 |     cout << s.size() << endl;
      |     ^~~~
a.cc:12:13: error: 's' was not declared in this scope
   12 |     cout << s.size() << endl;
      |             ^
a.cc:12:25: error: 'endl' was not declared in this scope
   12 |     cout << s.size() << endl;
      |                         ^~~~
Language: C++

#include<stdio.h>
#include<string.h>
#include<math.h>
int a,s,d[1000000001],f=0,g,h,i,j;
int main(void)
{
for(i=1;i<=1000000000;i++) d[i]=0;
scanf("%d",&a);
for(i=0;i<a;i++){
if(d[a]==0){
d[a]=1;
f++;
}
else{
d[a]=0;
f--;
}
}
printf("%d\n",f);
return 0;
}

Compiler output:
/tmp/ccm3ZRRF.o: in function `main':
a.cc:(.text+0x6): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0x12): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0x30): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0x39): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0x3f): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0x6a): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0xb5): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0xbe): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0xe4): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0xed): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/ccm3ZRRF.o
a.cc:(.text+0xf3): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

    #include<stdio.h>
    #include<string.h>
    #include<math.h>
    int a,s,d[1000000001],f=0,g,h,i,j;
    int main(void)
    {
    for(i=1;i<=1000000000;i++) d[i]=0;
    scanf("%d",&a);
    for(i=0;i<a;i++){
    if(d[a]==0){
    d[a]=1;
    f++;
    }
    else{
    d[a]=0;
    f--;
    }
    }
    printf("%d\n",f);
    return 0;
    }

Compiler output:
/tmp/cckcE2hx.o: in function `main':
a.cc:(.text+0x6): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0x12): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0x30): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0x39): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0x3f): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0x6a): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0xb5): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0xbe): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0xe4): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0xed): relocation truncated to fit: R_X86_64_PC32 against symbol `f' defined in .bss section in /tmp/cckcE2hx.o
a.cc:(.text+0xf3): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: Java

import java.util.*;
 
public class Test{
    public static int main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.nextLine());
        String str = "";
        ArrayList<Integer> ar = new ArrayList<Integer>();
        
        if(N < 1 || N > 100000)
            return 0;
        
        
        else{
            for(int i = 0; i < N;i++){
                str = sc.nextLine();
                if(Integer.parseInt(str) < 1 || Integer.parseInt(str) > 100000000)
                    System.exit(0);
                
                if(ar.contains(Integer.parseInt(str))){
                    ar.remove(ar.indexOf(Integer.parseInt(str)));
                }
                else{
                    ar.add(Integer.parseInt(str));
                }
            }
        }
        
       return ar.size();
    }
}

Compiler output:
Main.java:3: error: class Test is public, should be declared in a file named Test.java
public class Test{
       ^
1 error
Language: Java

import java.util.*;
 
public class Main{
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int N = Integer.parseInt(sc.nextLine());
        String str = "";
        ArrayList<Integer> ar = new ArrayList<Integer>();
        
        else{
            for(int i = 0; i < N;i++){
                str = sc.nextLine();
                
                if(ar.contains(Integer.parseInt(str))){
                    ar.remove(ar.indexOf(Integer.parseInt(str)));
                }
                else{
                    ar.add(Integer.parseInt(str));
                }
            }
        }
        
        System.out.println(ar.size());
    }
}

Compiler output:
Main.java:10: error: 'else' without 'if'
        else{
        ^
1 error
Language: Java

public class Main {
    public static void main(String[] args) {
        //最後の数値計算
        int answer = 0;

        //入力部
        Scanner sc = new Scanner(System.in);
        int roopTimes = Integer.parseInt(sc.nextLine());

        int[] inputAllNumbers = new int[roopTimes + 1];//オーバーラン防止
        for (int i = 0; i < roopTimes; i++) {
            int inputNumber = sc.nextInt();
            inputAllNumbers[i] = inputNumber;
        }


        //@TODO この書き方はまだ完全に理解しきれてないので要勉強
        //表記方法はメソッド参照(Java8からの書き方）、クラス名:メソッド名で呼び出す
        //あー、なんとなくわかった
        //これsortの方法としてStringのcompareToを呼び出してるってっていう、ものすごいストレートな書き方なんだな
        //いいなこれ、かっこいい

        //Hashsetの部分を通常の配列に変更
        Arrays.sort(inputAllNumbers);

        answer = countSearch(inputAllNumbers);
        System.out.println(answer);
    }

    //線形探索メソッド
    //あんまり機能を詰め込むと汎用性がなくなるので、単純にカウントして回数を返すだけにする
    static int countSearch(int[] checkTarget) {
        int count = 0;

        for (int i = 0; i < checkTarget.length; i++) {
            if (checkTarget[i] == checkTarget[i+1]) {
                i++;
            }else{
                count++;
            }
        }
        return count;
    }
}


Compiler output:
Main.java:7: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:7: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
Main.java:24: error: cannot find symbol
        Arrays.sort(inputAllNumbers);
        ^
  symbol:   variable Arrays
  location: class Main
3 errors
Language: Java

public class Main {
    public static void main(String[] args) {
        //最後の数値計算
        int answer = 0;

        //入力部
        Scanner sc = new Scanner(System.in);
        int roopTimes = Integer.parseInt(sc.nextLine());

        ArrayList<String> inputAllNumbers = new ArrayList<>();
        HashSet<String> checkNumbers = new HashSet<>();            //探索時に使うやつ、重複をなくすためHashSet

        for (int i = 0; i < roopTimes; i++) {
            String inputNumber = sc.nextLine();
            inputAllNumbers.add(inputNumber);
            checkNumbers.add(inputNumber);
        }


        //@TODO この書き方はまだ完全に理解しきれてないので要勉強
        //表記方法はメソッド参照(Java8からの書き方）、クラス名:メソッド名で呼び出す
        //あー、なんとなくわかった
        //これsortの方法としてStringのcompareToを呼び出してるってっていう、ものすごいストレートな書き方なんだな
        //いいなこれ、かっこいい
        //inputAllNumbers.sort(String::compareTo);

        //並び替えなくてもそのままカウントできるから上いらないかも？
        for (String key : checkNumbers) {
            if (countSearch(inputAllNumbers, key) % 2 == 0) {
                answer += 1;
            }
        }

        System.out.println(answer);
    }

Compiler output:
Main.java:35: error: reached end of file while parsing
    }
     ^
1 error
Language: C++

#include <iostream>
using namespace std;
 
int main(){
  int a[1000000000];
  int x,y,j;
  cin >> x;
  for(int j = x; j > 0; j--){
  	a[x-1] =0;
  }
  for(int i =0; i < x; i++){
    cin >> y;
    int j =0;
    while(1){
      if(a[j] ==y){
      a[j] = 0;
      }else if(a[j] == 0){
      a[j] = y;
      }else if(a[j] == null){
        break;
      }else{
        j++;
      }
    }
  }
  cout << x << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:24: error: 'null' was not declared in this scope
   19 |       }else if(a[j] == null){
      |                        ^~~~
Language: C++

#include <iostream>
using namespace std;

void  search(int x){
  int j =0;
  while(1){
    if(a[j] ==x){
      a[j] = 0;
    }else if(a[j] == 0){
      a[j] = x;
    }else if(a[j] == NULL){
      break;
    }else{
      j++;
    }
  }
}
int main(){
  int a[1000000000];
  int x,y;
  cin >> x;
  for(int j = x; j > 0; j--){
  	a[x-1] =0;
  }
  for(int i =0; i < x; i++){
    cin >> y;
    search(y);       
    }
  }
  cout << x << endl;
}



Compiler output:
a.cc: In function 'void search(int)':
a.cc:7:8: error: 'a' was not declared in this scope
    7 |     if(a[j] ==x){
      |        ^
a.cc: At global scope:
a.cc:30:3: error: 'cout' does not name a type
   30 |   cout << x << endl;
      |   ^~~~
a.cc:31:1: error: expected declaration before '}' token
   31 | }
      | ^
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <functional>
#include <stdio.h>
#include <string.h>
#include <math.h>
using namespace std;

template <class I>
void radix_sort(I first, I last) {
    using T = typename iterator_traits<I>::value_type;
    static_assert(is_integral<T>::value, "");
    constexpr int L = 8, M = 1 << L, K = (sizeof(T) * CHAR_BIT + L - 1) / L;

    size_t n = last - first;
    T *p[2] = { &*first, (T *)malloc(n * sizeof(T)) };
    size_t m[M];

    for (int k = 0; k < K; k++) {
        fill_n(m, M, 0);
        for (size_t i = 0; i < n; i++) {
            m[p[0][i] >> (L * k) & M - 1]++;
        }
        for (int j = M - 1; j > 0; j--) {
            m[j] = m[j - 1];
        }
        m[0] = 0;
        for (int j = 2; j < M; j++) {
            m[j] += m[j - 1];
        }
        for (size_t i = 0; i < n; i++) {
            T t = p[0][i];
            p[1][m[t >> (L * k) & M - 1]++] = t;
        }
        swap(p[0], p[1]);
    }
    if (K % 2 == 1) {
        swap(p[0], p[1]);
        copy_n(p[1], n, p[0]);
    }
    if (is_signed<T>::value) {
        T *q = upper_bound(p[0], p[0] + n, 0, greater<>());
        rotate(p[0], q, p[0] + n);
    }
    free(p[1]);
}

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

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

    radix_sort(a.begin(), a.end());

    int r = 0, b = 0;
    for (int i = 0; i < n; i++) {
        if (a[i] == b) {
            r--;
            b = 0;
        } else {
            b = a[i];
        }
    }

    cout << r * 2 + n << endl;

    return 0;
}

Compiler output:
a.cc: In function 'void radix_sort(I, I)':
a.cc:15:55: error: 'CHAR_BIT' was not declared in this scope
   15 |     constexpr int L = 8, M = 1 << L, K = (sizeof(T) * CHAR_BIT + L - 1) / L;
      |                                                       ^~~~~~~~
a.cc:9:1: note: 'CHAR_BIT' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    8 | #include <math.h>
  +++ |+#include <climits>
    9 | using namespace std;
Language: C

#include<stdio.h>
int K[1000000001];
int N, a;
int i, sum;
 
int main(void){
  scanf("%d", &N);
 
  for(i = 0; i < N; i++){
    scanf("%d", &a);
    K[a] ^= 1;
  }
  sum = 0;
  for(i = 0; i < 1000000001; i++){
   sum += K[i];
  }
  printf("%d", sum);
    
  return 0;
}

Compiler output:
/tmp/ccG0HWaJ.o: in function `main':
main.c:(.text+0x7): relocation truncated to fit: R_X86_64_PC32 against symbol `N' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x24): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x31): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x4e): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x68): relocation truncated to fit: R_X86_64_PC32 against symbol `a' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x87): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x90): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x96): relocation truncated to fit: R_X86_64_PC32 against symbol `i' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0x9c): relocation truncated to fit: R_X86_64_PC32 against symbol `N' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0xa6): relocation truncated to fit: R_X86_64_PC32 against symbol `sum' defined in .bss section in /tmp/ccG0HWaJ.o
main.c:(.text+0xb0): additional relocation overflows omitted from the output
collect2: error: ld returned 1 exit status
Language: C++

class WriteandEraseGame {
private:
	int process_times;
	int input_num;
	vector <int> num_v;
	bool IsWrite;
public:
	void GetTimesDrawPaper();
	void GamePlay();
	void GetInputNum();
	void RecordNum();
	void ShowNumofNums();
};

int main() {
	WriteandEraseGame game;
	game.GamePlay();
	game.ShowNumofNums();
	return 0;
}

void WriteandEraseGame::GetTimesDrawPaper() {
	cin >> process_times;
}

void WriteandEraseGame::GamePlay() {
	GetTimesDrawPaper();
	for (int i = 0; i < process_times; i++) {
		GetInputNum();
		RecordNum();
	}
}

void WriteandEraseGame::GetInputNum() {
	cin >> input_num;
}

void WriteandEraseGame::RecordNum() {
	IsWrite = true;
	for (int i = 0; i < num_v.size(); i++) {
		if (input_num == num_v[i]) {
			num_v.erase(num_v.begin() + i);
			IsWrite = false;
			break;
		}		
	}
	if (IsWrite) num_v.push_back(input_num);
}

void WriteandEraseGame::ShowNumofNums() {
	cout << num_v.size() << endl;
}


Compiler output:
a.cc:5:9: error: 'vector' does not name a type
    5 |         vector <int> num_v;
      |         ^~~~~~
a.cc: In member function 'void WriteandEraseGame::GetTimesDrawPaper()':
a.cc:23:9: error: 'cin' was not declared in this scope
   23 |         cin >> process_times;
      |         ^~~
a.cc: In member function 'void WriteandEraseGame::GetInputNum()':
a.cc:35:9: error: 'cin' was not declared in this scope
   35 |         cin >> input_num;
      |         ^~~
a.cc: In member function 'void WriteandEraseGame::RecordNum()':
a.cc:40:29: error: 'num_v' was not declared in this scope
   40 |         for (int i = 0; i < num_v.size(); i++) {
      |                             ^~~~~
a.cc:47:22: error: 'num_v' was not declared in this scope
   47 |         if (IsWrite) num_v.push_back(input_num);
      |                      ^~~~~
a.cc: In member function 'void WriteandEraseGame::ShowNumofNums()':
a.cc:51:9: error: 'cout' was not declared in this scope
   51 |         cout << num_v.size() << endl;
      |         ^~~~
a.cc:51:17: error: 'num_v' was not declared in this scope
   51 |         cout << num_v.size() << endl;
      |                 ^~~~~
a.cc:51:33: error: 'endl' was not declared in this scope
   51 |         cout << num_v.size() << endl;
      |                                 ^~~~
Language: C++

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

int main()
{
	long long i,j,k,n,tab[100010];
	map <long long,long long> mp;
	cin>>n;
	mp.clear();
	for (i=1;i<=n;i++)
	{
		cin>>tab[i];
		mp[tab[i]]++;
	}
	long long sum=0;
	for (i=1;i<=n;i++)
	{
		if (mp[tab[i]]==0) continue;
		if (mp[tab[i]]%2==1) sum++;
		else
		 {
		 	sum--;
		 	sum=max(sum,0);
		 }
		mp[tab[i]]=0;
	}
	cout<<sum<<"\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:32: error: no matching function for call to 'max(long long int&, int)'
   23 |                         sum=max(sum,0);
      |                             ~~~^~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:23:32: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   23 |                         sum=max(sum,0);
      |                             ~~~^~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:23:32: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   23 |                         sum=max(sum,0);
      |                             ~~~^~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define all(v) v.begin(),v.end()
#define sz(v)  (int)v.size()
#define pb push_back()
typedef vector<r> vi;
int main(){
  ios::sync_with_stdio(0);
  cin.tie(0);
vi v1;	
int n;	
cin>>n;
  int r;
for(int i = 0 ; i < n ; i++){
  cin>>r;
  if(find(all(v1),r) != v1.end()) {
    v1.erase(find(all(v1),r));
    
  }
  else {v1.push_back(r);}
  
  
}
 
cout<<sz(v1);
}

Compiler output:
a.cc:6:16: error: 'r' was not declared in this scope
    6 | typedef vector<r> vi;
      |                ^
a.cc:6:17: error: template argument 1 is invalid
    6 | typedef vector<r> vi;
      |                 ^
a.cc:6:17: error: template argument 2 is invalid
a.cc: In function 'int main()':
a.cc:3:18: error: request for member 'begin' in 'v1', which is of non-class type 'vi' {aka 'int'}
    3 | #define all(v) v.begin(),v.end()
      |                  ^~~~~
a.cc:16:11: note: in expansion of macro 'all'
   16 |   if(find(all(v1),r) != v1.end()) {
      |           ^~~
a.cc:3:28: error: request for member 'end' in 'v1', which is of non-class type 'vi' {aka 'int'}
    3 | #define all(v) v.begin(),v.end()
      |                            ^~~
a.cc:16:11: note: in expansion of macro 'all'
   16 |   if(find(all(v1),r) != v1.end()) {
      |           ^~~
a.cc:16:28: error: request for member 'end' in 'v1', which is of non-class type 'vi' {aka 'int'}
   16 |   if(find(all(v1),r) != v1.end()) {
      |                            ^~~
a.cc:17:8: error: request for member 'erase' in 'v1', which is of non-class type 'vi' {aka 'int'}
   17 |     v1.erase(find(all(v1),r));
      |        ^~~~~
a.cc:3:18: error: request for member 'begin' in 'v1', which is of non-class type 'vi' {aka 'int'}
    3 | #define all(v) v.begin(),v.end()
      |                  ^~~~~
a.cc:17:19: note: in expansion of macro 'all'
   17 |     v1.erase(find(all(v1),r));
      |                   ^~~
a.cc:3:28: error: request for member 'end' in 'v1', which is of non-class type 'vi' {aka 'int'}
    3 | #define all(v) v.begin(),v.end()
      |                            ^~~
a.cc:17:19: note: in expansion of macro 'all'
   17 |     v1.erase(find(all(v1),r));
      |                   ^~~
a.cc:20:12: error: request for member 'push_back' in 'v1', which is of non-class type 'vi' {aka 'int'}
   20 |   else {v1.push_back(r);}
      |            ^~~~~~~~~
a.cc:4:23: error: request for member 'size' in 'v1', which is of non-class type 'vi' {aka 'int'}
    4 | #define sz(v)  (int)v.size()
      |                       ^~~~
a.cc:25:7: note: in expansion of macro 'sz'
   25 | cout<<sz(v1);
      |       ^~
Language: C++

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

int main()
{
	int n,b,i;
	int a[1000000000]；
	for (i=0;i<=1000000000;i++)
		a[i]=0;
	cin>>n;
	for (i=0;i<n;i++)
	{
		cin>>b;
		if (a[b]==0)a[b]=1;
		else a[b]=0;
	}
	b=0;
	for(i=0;i<n;i++)
		if (a[i]==1) b++;
	cout<<b<<endl;
	return 0;
 } 

Compiler output:
a.cc: In function 'int main()':
a.cc:7:26: error: expected initializer before '\U0000ff1b'
    7 |         int a[1000000000]；
      |                          ^~
a.cc:8:35: error: expected ';' before ')' token
    8 |         for (i=0;i<=1000000000;i++)
      |                                   ^
      |                                   ;
a.cc:14:21: error: 'a' was not declared in this scope
   14 |                 if (a[b]==0)a[b]=1;
      |                     ^
a.cc:19:21: error: 'a' was not declared in this scope
   19 |                 if (a[i]==1) b++;
      |                     ^
Language: C++

#include <cstdio>
#include <vector>

int main()
{
	scanf("%d",&n);
	std::vector<int> data(n);
	for(int i = 0;i < n;++i) {
		scanf("%d",&data[i]);
	}
	sort(data.begin(),data.end());
	int ans = 0,cnt = 0;
	for(int i = 0;i < n;++i) {
		if(i > 0 && data[i] != data[i - 1]) {
			ans += cnt % 2;
			cnt = 0;
		}
		++cnt;
	}
	ans += cnt % 2;
	cnt = 0;
	printf("%d\n",ans);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:21: error: 'n' was not declared in this scope
    6 |         scanf("%d",&n);
      |                     ^
a.cc:11:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |         sort(data.begin(),data.end());
      |         ^~~~
      |         short
Language: C++

import java.util.HashMap;
import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		int n = scan.nextInt();
		int[] arr = new int[100005];
		HashMap<Integer, Integer> map = new HashMap<Integer, Integer> ();
		int cnt = 0;
		for(int i = 0; i < n; i++) {
			int a = scan.nextInt();
			if(map.containsKey(a) == false) {
				map.put(a, cnt);
				cnt++;
			}
			arr[map.get(a)] += 1;
		}
		int ans = 0;
		for(int i = 0; i < cnt; i++) {
			if(arr[i] % 2 == 1) ans++;
		}
		System.out.printf("%d\n", ans);
		scan.close();
	}
}

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.HashMap;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:2:1: error: 'import' does not name a type
    2 | import java.util.Scanner;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:4:1: error: expected unqualified-id before 'public'
    4 | public class Main {
      | ^~~~~~
Language: C++

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

long n;
unsigned long long k,sum;
//bool ada[100005]={0};
int main(){
	n=0;
	cin>>n;
	map<int,bool>m;
	for(int i =0; i<n; i++){
		cin>>k;
		if(m[k]){
			k[k]=false;
			sum--;
		}
		else {
			m[k]=true;
			sum++;
		}
	}
	cout<<sum<<"\n";
	
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:26: error: invalid types 'long long unsigned int[long long unsigned int]' for array subscript
   14 |                         k[k]=false;
      |                          ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
map<int, int> mp;
int n;
int main(){
    //freopen("input.txt", "r", stdin);
    ios::sync_with_stdio(false);
    cin.tie(0);
    cin >> n;
    for(int i = 0; i < n; i++){
        int a;
        cin >> a;
        mp[a]++;
    }
    int ans = 0;
    for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
        if(it->second & 1) ans++;
    }
    cout << ans << "\n";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:23: error: 'template<class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> struct std::iterator' used without template arguments
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                       ^~~~~~~~
a.cc:16:36: error: qualified-id in declaration before '=' token
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                                    ^
a.cc:16:35: error: expected ';' before '=' token
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                                   ^~
      |                                   ;
a.cc:16:36: error: expected primary-expression before '=' token
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                                    ^
a.cc:16:51: error: 'it' was not declared in this scope; did you mean 'int'?
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                                                   ^~
      |                                                   int
a.cc:16:65: error: expected ')' before ';' token
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |        ~                                                        ^
      |                                                                 )
a.cc:16:67: error: 'it' was not declared in this scope; did you mean 'int'?
   16 |     for(map<int, int> iterator::it = mp.begin();  it != mp.end(); it++){
      |                                                                   ^~
      |                                                                   int
Language: C++

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

map<int,int> ma;
int N, a, ans;

int main() {
	cin >> N;
  	for (int i = 0; i < N; ++i) {
    	cin >> a;
        if (ma[a]) {
        	ans--;
          	ma[a] = 0;
        } else {
        	ans++;
          	ans[a] = 1;
        }
    }
    cout << ans;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:20: error: invalid types 'int[int]' for array subscript
   16 |                 ans[a] = 1;
      |                    ^
Language: C++

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

bool arr [1000000005];
int N, a, ans

int main() {
	cin >> N;
  	for (int i = 0; i < N; ++i) {
    	cin >> a;
        arr[a] = !arr[a];
        if (arr[a])
        	ans++;
        else
        	ans--;
    }
    cout << ans;
}


Compiler output:
a.cc:7:1: error: expected initializer before 'int'
    7 | int main() {
      | ^~~
Language: C++

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

unsigned char d[10000000100];

int main()
{
	int n;
	cin >> n;
	int result = 0;
	vector<int> v;
	for (int i = 0; i < n; i++)
	{
		int buf;
		cin >> buf;
		auto itr = std::find(v.begin(), v.end(), buf);
		if (itr == v.end())
		{
			v.push_back(buf);
		}
		else
		{
			v.erase(itr);
		}
	}
	cout << v.size() << endl;
	return 0;
}

Compiler output:
a.cc:5:10: fatal error: algorithm : No such file or directory
    5 | #include <algorithm >
      |          ^~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <set>
#include <vector>
int main(){
    int n;
	cin>>n;
	for (;n;--n)
	{
		int val;
		cin>>val;
		if (s.find(val)!=s.end())
			s.erase(val);
		else
			s.insert(val);
	}
	cout<<s.size()<<endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: 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:11:21: error: 's' was not declared in this scope
   11 |                 if (s.find(val)!=s.end())
      |                     ^
a.cc:16:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |         cout<<s.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:16:15: error: 's' was not declared in this scope
   16 |         cout<<s.size()<<endl;
      |               ^
a.cc:16:25: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   16 |         cout<<s.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;
int num[100010];

int cmp (const void *a,const void *b)
{
    return *(int *)a - *(int *)b;
}

int main()
{
    int n;
    int i;
    int sum;
    scanf("%d",&n)
    memset(num,0,sizeof (num));
    sum=n;
    for (i=0;i<n;i++)
        {
            scanf("%d",&num[i]);
        }
        qsort(num,n,sizeof (num[0]),cmp);
        for (i=1;i<n;i++)
        {
            if (num[i]==num[i-1])
            {
                sum-=2;
                i++;
            }
        }
    printf("%d\n",sum);
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:19: error: expected ';' before 'memset'
   15 |     scanf("%d",&n)
      |                   ^
      |                   ;
   16 |     memset(num,0,sizeof (num));
      |     ~~~~~~
Language: C++

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


int main()
{              
	int n;
	cin>>n;
	int a[n];
	for(int i=0; i<n; i++){
		cin>>a[i];
	}
	sort(a,a+n);
	int cnt=0,cnt1=0;
	for(int i=0; i<n; i++){
	 	if(a[i]==a[i+1]){
	 		cnt++;
	 	}
	 	else{
	 		if(cnt%2!=0){
	 			cnt1++;
	 		}
	 		cnt=0;
	 	}
	}
	cout<<cnt1;
	return 0;	
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   16 |         sort(a,a+n);
      |         ^~~~
      |         short
Language: C++

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

using namespace std;

unsigned char d[10000000100];

int main()
{
	int n;
	cin >> n;
	int result = 0;
	vector<int> v;
	for (int i = 0; i < n; i++)
	{
		int buf;
		cin >> buf;
		auto itr = std::find(v.begin(), v.end(), buf);
		if (itr == v.end())
		{
			v.push_back(buf);
		}
		else
		{
			v.erase(itr);
		}
	}
	cout << v.size() << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:37: error: no matching function for call to 'find(std::vector<int>::iterator, std::vector<int>::iterator, int&)'
   20 |                 auto itr = std::find(v.begin(), v.end(), buf);
      |                            ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
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:20:37: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'std::istreambuf_iterator<_CharT>'
   20 |                 auto itr = std::find(v.begin(), v.end(), buf);
      |                            ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

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

using namespace std;

unsigned char d[10000000100];

int main()
{
	int n;
	cin >> n;
	int result = 0;
	vector<int> v;
	for (int i = 0; i < n; i++)
	{
		int buf;
		cin >> buf;
		auto itr = find(v.begin(), v.end(), (int)buf);
		if (itr == v.end())
		{
			v.push_back(buf);
		}
		else
		{
			v.erase(itr);
		}
	}
	cout << v.size() << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:32: error: no matching function for call to 'find(std::vector<int>::iterator, std::vector<int>::iterator, int)'
   20 |                 auto itr = find(v.begin(), v.end(), (int)buf);
      |                            ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:20:32: note:   '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' is not derived from 'std::istreambuf_iterator<_CharT>'
   20 |                 auto itr = find(v.begin(), v.end(), (int)buf);
      |                            ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
long a[10000000000];
long v[10000000000];
int s;
int main()
{
	memset(v,-1,sizeof(v));
	int n;
	cin>>n;
	for(int i=1;i<=n;i++) cin>>a[i];
	for(int i=1;i<=n;i++)
	{
		bool flag=false;
		for(int j=1;j<=n;j++)
		{
			if(a[i]==v[j])
			{
				s-=1;
				v[j]=-1;
				flag=true;
				break;
			}
		}
		if(!flag)
		{
			v[i]=a[i];
			s++;
		}
	}
	cout<<s<<endl;
	return 0;
}

Compiler output:
/tmp/cchCxIfS.o: in function `main':
a.cc:(.text+0x1d): relocation truncated to fit: R_X86_64_PC32 against symbol `v' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0xbe): relocation truncated to fit: R_X86_64_PC32 against symbol `v' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0xcd): relocation truncated to fit: R_X86_64_PC32 against symbol `s' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0xd6): relocation truncated to fit: R_X86_64_PC32 against symbol `s' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0xea): relocation truncated to fit: R_X86_64_PC32 against symbol `v' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0x13c): relocation truncated to fit: R_X86_64_PC32 against symbol `v' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0x146): relocation truncated to fit: R_X86_64_PC32 against symbol `s' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0x14f): relocation truncated to fit: R_X86_64_PC32 against symbol `s' defined in .bss section in /tmp/cchCxIfS.o
a.cc:(.text+0x165): relocation truncated to fit: R_X86_64_PC32 against symbol `s' defined in .bss section in /tmp/cchCxIfS.o
collect2: error: ld returned 1 exit status