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

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

int main(){
    int n,pa=0,pb=0;
    cin>>n;
    vector<int> a(n);
    for(int i=0;i<n;i++) cin>>v[i];
    sort(a.begin(),a.end());
    for(int i=0;i<n;i++){
        if(i%2==0) pa+=v[i];
        else pb+=v[i];
    }
    cout<<pa-pb<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:31: error: 'v' was not declared in this scope
    8 |     for(int i=0;i<n;i++) cin>>v[i];
      |                               ^
a.cc:11:24: error: 'v' was not declared in this scope
   11 |         if(i%2==0) pa+=v[i];
      |                        ^
a.cc:12:18: error: 'v' was not declared in this scope
   12 |         else pb+=v[i];
      |                  ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:21:22: error: invalid types '<unresolved overloaded function type>[int]' for array subscript
   21 |     alice_score+=a.at[N-1];
      |                      ^
Language: C++

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

int main() {
  int M,N,i,j;
  cin>>N;
  vector<string> s(N);
  for(i=0;i<N;i++){
    cin>>a.at(i);
  }
  sort(a.begin(),a.end(),greater<int>());
  int A=0;
  int B=0;
  for(i=0;i<N;i++){
    if(i%2==0)A+=a.at(i);
    else B+=a.at(i);
  }
  cout<<(A-B)<<endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: 'a' was not declared in this scope
    9 |     cin>>a.at(i);
      |          ^
a.cc:11:8: error: 'a' was not declared in this scope
   11 |   sort(a.begin(),a.end(),greater<int>());
      |        ^
Language: C++

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

int main() {
  vector<int> vec(N);
  for(int i=0;i<N;i++){
    cin>>vec.at(i);
  }
  sort(vec.begin(),vec.end());
  reverse(vec.begin(),vec.end());
  int alice=0;
  int bob=0;
  
  for(int i=0;i<N;i+=2){
    alice+=vec.at(i);
  }
  for(int i=1;i<N;i+=2){
    bob+=vec.at(i);
  }
  cout<<alice-bob<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:19: error: 'N' was not declared in this scope
    5 |   vector<int> vec(N);
      |                   ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> list(N);
  for (int i = 0; i < N; i++) {
      cin >> list.at(i);
  }
  sort(list.begin(), list.end());
  reverse(list.begin(), list.end());
  int A = 0;
  int B = 0;
  for (int i = 0; i < N; i += 2) {
      A += list.at(i);
  }
  for (int i = 1; i < N; i += 2) {
      B += list.at(i);
  }
  cout << A - B << endl;
  
}
　


Compiler output:
a.cc:24:1: error: extended character 　 is not valid in an identifier
   24 | 　
      | ^
a.cc:24:1: error: '\U00003000' does not name a type
   24 | 　
      | ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
  int a;
  for(int i = 0; i < a;i++){
    cin >> a;
  }
  vector<int> vec = {a};
  sort(vec.begin(), vec.end());
    reverse(vec.begin(), vec.end());
    for(int j = 0; j < a; j += 2){
      sum = vec.at(j);
    }
    for(int k = 1; k < a; k += 2){
      sum = vec.at(k);
    }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:7: error: 'sum' was not declared in this scope
   13 |       sum = vec.at(j);
      |       ^~~
a.cc:16:7: error: 'sum' was not declared in this scope
   16 |       sum = vec.at(k);
      |       ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
  int a;
  for(int i = 0; i < a;i++){
    cin >> a}
  vector<int> vec = {a};
  sort(vec.begin(), vec.end());
    reverse(vec.begin(), vec.end());
    for(int j = 0; j < a; j += 2){
      sum = vec.at(j);
    }
    for(int k = 1; k < a; k += 2){
      sum = vec.at(k);
    }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: expected ';' before '}' token
    7 |     cin >> a}
      |             ^
      |             ;
a.cc:12:7: error: 'sum' was not declared in this scope
   12 |       sum = vec.at(j);
      |       ^~~
a.cc:15:7: error: 'sum' was not declared in this scope
   15 |       sum = vec.at(k);
      |       ^~~
Language: C

#include <stdio.h>
#include <stdlib.h>

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

int main(){
  int n,i,ans=0;
  scanf("%d",&n);
  int num[110];
  for(i=0;i<n;i++)scanf("%d",&num[i]);
  qsort(num,n,sizeof(int),compare);
  for(i=0;i<n;i++){
    if(n==0||n%2==0)ans+=num[i];
    else ans -=num[i]
  }
  printf("%d\n",ans);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:16:22: error: expected ';' before '}' token
   16 |     else ans -=num[i]
      |                      ^
      |                      ;
   17 |   }
      |   ~
Language: C

#include <stdio.h>
#include <stdlib.h>

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

int main(){
  int n,i,ans=0;
  scanf("%d",&n);
  int num[110];
  for(i=0;i<n;i++)scanf("%d",num[i]);
  qsort(num,n,sizeof(int),compare);
  for(i=0;i<n;i++){
    if(n==0||n%2==0)ans+=num[i];
    else ans -=num[i]
  }
  printf("%d\n",ans);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:16:22: error: expected ';' before '}' token
   16 |     else ans -=num[i]
      |                      ^
      |                      ;
   17 |   }
      |   ~
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> card(N);
  for(int i=0;i<N;i++){
    int a;
    cin >> a;
    card.at(i) =a;
      }
    //sort(card.begin(), card.end());
    reverse()
    int A=0,B=0;
    for(int i=0;i<N;i++){
      if(i%2==0){
        B += card.at(i);
      }
      else{
        W += card.at(i);
      }
    }
    cout << A-B << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:12: error: no matching function for call to 'reverse()'
   14 |     reverse()
      |     ~~~~~~~^~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:1083:5: note: candidate: 'template<class _BIter> void std::reverse(_BIter, _BIter)'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |     ^~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1083:5: note:   candidate expects 2 arguments, 0 provided
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:249:1: note: candidate: 'template<class _ExecutionPolicy, class _BidirectionalIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::reverse(_ExecutionPolicy&&, _BidirectionalIterator, _BidirectionalIterator)'
  249 | reverse(_ExecutionPolicy&& __exec, _BidirectionalIterator __first, _BidirectionalIterator __last);
      | ^~~~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:249:1: note:   candidate expects 3 arguments, 0 provided
a.cc:18:9: error: 'B' was not declared in this scope
   18 |         B += card.at(i);
      |         ^
a.cc:21:9: error: 'W' was not declared in this scope
   21 |         W += card.at(i);
      |         ^
a.cc:24:13: error: 'A' was not declared in this scope
   24 |     cout << A-B << endl;
      |             ^
a.cc:24:15: error: 'B' was not declared in this scope
   24 |     cout << A-B << endl;
      |               ^
Language: C++

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

using namespace std;

int main() {
	int N;
	cin >> N;
	vector<int> a(N);

	for (int i = 0; i < N; i++) {
		cin >> a.at(i);
	}

	sort(a.begin(), a.end());
	reverse(a.begin(), a.end());

	int alice = 0;
	int bob = 0;
	int ans = 0;

	for (int j = 0; j < N;j++) {
		if (j % 2 == 0) {
			alice += a.at(j);
		}
		else {
			bob += a.at(j);
		}
	}
	ans = alice - bob;
	cout << ans << endl;

	cout << endl;
	return 0;
}



Compiler output:
a.cc:2:10: fatal error: minmax.h: No such file or directory
    2 | #include <minmax.h>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

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

using namespace std;

int main() {
	int N;
	cin >> N;
	vector<int> a(N);

	for (int i = 0; i < N; i++) {
		cin >> a.at(i);
	}

	sort(a.begin(), a.end());
	reverse(a.begin(), a.end());

	int alice = 0;
	int bob = 0;
	int ans = 0;

	for (int j = 0; j < N;j++) {
		if (j % 2 == 0) {
			alice += a.at(j);
		}
		else {
			bob += a.at(j);
		}
	}
	ans = alice - bob;
	cout << ans << endl;

	return 0;
}



Compiler output:
a.cc:2:10: fatal error: minmax.h: No such file or directory
    2 | #include <minmax.h>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

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

int main() {
  int n; cin >> n;
  vector<int> cards(n);
  for (int i = 0; i < n; i++) {
    cin >> cards.at(i);
  }

  sort(cards.begin(), cards.end(), greater<int>());
  if (cards.size % 2 == 1) {
    cards.push_back(0);
  }
  
  int diff = 0;
  for (int i = 0; i < n; i = i + 2) {
    diff += cards.at(i) - cards.at(i+1);
  }
  
  cout << diff << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:13: error: invalid use of member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]' (did you forget the '()' ?)
   12 |   if (cards.size % 2 == 1) {
      |       ~~~~~~^~~~
      |                 ()
Language: C++

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

int main() {
  int N, Alice, Bob;
  cin >> N;
  vector<int> vec(N,0);
  for(int i; i<N; i++){
    cin >> vec.at(i) 
  }
  sort(vec.begin(), vec.end());
  reverse(vec.begin(), vec.end());
  if(vec.size()%2 == 1){
    vec.push_back(0);
  }
  for(int i; i<N; i+2){
    Alice += vec.at(i);
    Bob += vec.at(i+1);
  }
  cout << Alice - Bob << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: expected ';' before '}' token
    9 |     cin >> vec.at(i)
      |                     ^
      |                     ;
   10 |   }
      |   ~
Language: C

#include <stdio.h>
int n,t,a[100];
void sort(int *a){
  for(int i=1;i<n;i++)for(int j=1;j<n;j++){
    if(a[i-1]<a[i]){
      t=a[i-1];
      a[i-1]=a[i];
      a[i]=t;
    }
  }
  return;
}
int main(){
  scanf("%d",&n);
  for(int i=0;i<n;i++)scanf("%d",&a[i]);
  sort(a);
  for(int i=0;i<n;i++)printf("%d\n"a[i]);
  int b=0,c=0;
  for(int i=0;i<n;i++){
    if(i%2)b+=a[i];
    else c+=a[i];
  }
  printf("%d",b-c);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:17:36: error: expected ')' before 'a'
   17 |   for(int i=0;i<n;i++)printf("%d\n"a[i]);
      |                             ~      ^
      |                                    )
Language: C

#include <stdio.h>
int n,t,a[100];
void sort(int *a){
  for(int i=1;i<n;i++)for(int j=1;j<n;j++){
    if(a[i-1]<a[i]){
      t=a[i-1];
      a[i-1]=a[i];
      a[i]=t;
    }
  }
  return;
}
int main(){
  scanf("%d",&n);
  for(int i=0;i<n;i++)scanf("%d",&a[i]);
  sort(a);
  printf("%d\n"a);
  int b=0,c=0;
  for(int i=0;i<n;i++){
    if(i%2)b+=a[i];
    else c+=a[i];
  }
  printf("%d",b-c);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:17:16: error: expected ')' before 'a'
   17 |   printf("%d\n"a);
      |         ~      ^
      |                )
Language: C

#include <stdio.h>
int n,t,a[100];
void sort(int *a){
  for(int i=1;i<n;i++)for(int j=1;j<n;j++){
    if(a[i-1]>a[i]){
      t=a[i-1];
      a[i-1]=a[i];
      a[i]=t;
    }
  }
  return;
}
int main(){
  scanf("%d",&n);
  for(int i=0,i<n;i++)scanf("%d",&a[i]);
  sort(a);
  int b=0,c=0;
  for(int i=0;i<n;i++){
    if(i%2)b+=a[i];
    else c+=a[i];
  }
  printf("%d",b-c);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:15:16: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
   15 |   for(int i=0,i<n;i++)scanf("%d",&a[i]);
      |                ^
main.c:15:22: error: expected ';' before ')' token
   15 |   for(int i=0,i<n;i++)scanf("%d",&a[i]);
      |                      ^
      |                      ;
Language: C++

#include <iostream>
#include <vector>
#include <algoroithm>

using namespace std;

int main(){
  int N;
  cin >> N;
  vector<int> V(N);
  for(int i = 0; i < N; i++) cin >> V[i];
  sort(V.begin(), V.end(), greater<int>());
  int a;
  int b;
  for(int i = 0; i < N; i++){
    if((i + 1) % 2 == 1) a += V[i];
    else b+= V[i];
  }
  cout << a - b;
}


Compiler output:
a.cc:3:10: fatal error: algoroithm: No such file or directory
    3 | #include <algoroithm>
      |          ^~~~~~~~~~~~
compilation terminated.
Language: C++

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

int main() {
  int N;
  vector<int> card(N);

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

  int A = 0, B = 0;
  sort(card.begin(), card.end());
  reverse(card.begin(), card.end());

  for(int i = 0; i < N; i++){
    if(i % 2 == 0){
      A += card.at(i);
    }
    else{
      B += card.at(i);
    }
  }

  res = A - B;

  cout << res << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:3: error: 'res' was not declared in this scope
   26 |   res = A - B;
      |   ^~~
Language: C++

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



int main() {
 int N;
 cin >> N;
  
  vector<int> a(N);
  
  for(int i=0; i<N; i++){
    for(int j=0; j<N-1-i; j++){
      if(a[j] < a[j+1]){
        int tmp = a[j];
        a[j] = a[j+1];
        a[j+1] = tmp;
      }
    }
  }
    cin >> a.at(i);
  
 
  for(int i=0; i<N;)
  int ans = 0;

  for(int i=0; i<N; i+=2)
    ans += a.at(i);
  for(int i=1; i<N; i+=2)
    ans -= a.at(i);
  
  
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:17: error: 'i' was not declared in this scope
   21 |     cin >> a.at(i);
      |                 ^
a.cc:28:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   28 |     ans += a.at(i);
      |     ^~~
      |     abs
a.cc:30:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   30 |     ans -= a.at(i);
      |     ^~~
      |     abs
a.cc:33:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   33 |   cout << ans << endl;
      |           ^~~
      |           abs
Language: C++

#include <iostream>
#include <stdio.h>
#include <math.h>
#include <string>
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 flag = 0;
    int ans = 0;
    for (int i=N-1; i>=0; i--){
        switch (flag){
            case 0:
                ans += a[i];
                flag = 1;
                break;
            case 1:
                ans -= a[i];
                flag = 0;
                break;
        }
    }
    cout << ans << 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 'sqrt'?
   16 |     sort(a, a+N);
      |     ^~~~
      |     sqrt
Language: C++

#include <iostream>
#include <stdio.h>
#include <math.h>
#include <string>
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, greater<int>());
    // for(int i=0; i<N; i++){
    //     cout << a[i] << " ";
    // }

    int ans = 0;
    for (int i=0; i<N; i++){
        if (i%2 == 0){
            ans += a[i];
        }else{
            ans -= a[i];
        }
    }
    cout << ans << 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 'sqrt'?
   16 |     sort(a, a+N, greater<int>());
      |     ^~~~
      |     sqrt
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()); // 昇順にソート
  reverse(vec.begin(), vec.end()); // 降順にソート
  
  int sum1 = sum2 = 0;
  
  for (int i = 0; i < N; i = i + 2) {
    sum1 += vec.at(i);
  }
  for (int i = 1; i < N; i = i + 2) {
    sum2 += vec.at(i);
  }
  
  cout << sum1 - sum2 << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:14: error: 'sum2' was not declared in this scope; did you mean 'sum1'?
   17 |   int sum1 = sum2 = 0;
      |              ^~~~
      |              sum1
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> num(N);
  for(int i = 0; i < N; ++i){
    cin >> num.at(i);
  }
  sort(num.begin(), num.end());
  reverce(num.begin(), num.end());
  int Alice=0,Bob=0;
  for(int i = 0; i < N; ++i){
    if(i%2==0){
      Alice += num.at(i);
    } else {
      Bob += num.at(i);
    }
  }
  cout << Alice-Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'reverce' was not declared in this scope
   12 |   reverce(num.begin(), num.end());
      |   ^~~~~~~
Language: C++

#include <stdio.h>
#include <iostream>
#include <math.h>
#include <string>
#include <vector>
#include <bits/stdc++.h>

using namespace std;
#define ll long long
#define pb push_back
 
int main() {
  int n, a=0, b = 0;
  cin >> n;
  vector<int> card(n,0);
 
  for(int i = 0; i < n; i++){
      cin >> card[i];
  }
  sort(card.begin(), card.end());
  int i=n-1;
  while(i>=0){
      a+=card[i];
      i--;
      b+=card[i];
      i--;
  }
 
  cout << a-b << endl;
 
}
#include <stdio.h>
#include <iostream>
#include <math.h>
#include <string>
#include <vector>
using namespace std;
#define ll long long
#define pb push_back

int main() {
  int n, a=0, b = 0;
  cin >> n;
  vector<int> card(n,0);

  for(int i = 0; i < n; i++){
      cin >> card[i];
  }
  sort(card.begin(), card.end());
  int i=n-1;
  while(i>=0){
      a+=card[i];
      i--;
      b+=card[i];
      i--;
  }

  cout << a-b << endl;

}


Compiler output:
a.cc:41:5: error: redefinition of 'int main()'
   41 | int main() {
      |     ^~~~
a.cc:12:5: note: 'int main()' previously defined here
   12 | int main() {
      |     ^~~~
Language: C++

#include <stdio.h>
#include <iostream>
#include <math.h>
#include <string>
#include <vector>
using namespace std;
#define ll long long
#define pb push_back

int main() {
  int n, a=0, b = 0;
  cin >> n;
  vector<int> card(n,0);

  for(int i = 0; i < n; i++){
      cin >> card[i];
  }
  sort(card.begin(), card.end());
  int i=n-1;
  while(i>=0){
      a+=card[i];
      i--;
      b+=card[i];
      i--;
  }

  cout << a-b << endl;

}


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

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

using namespace std;

int main() {
	int n,ai[1000];
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int a = 0; a < n - 1; a++) {
		for (int b = 0; b < n; b++) {
			if (ai[a] < ai[b]) {
				int c = ai[a];
				ai[a] = ai[b];
				ai[b] = c;
			}
		}
	}

	int suma=0, sumb=0;
	for (int j = 0; j < n; j++) {
		if (j % 2 == 0) {
			suma += ai[j];
		}
		else {
			sumb += ai[j];
		}
	}


}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:24: error: 'a' was not declared in this scope
   12 |                 cin >> a[i];
      |                        ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:14:3: error: expected ',' or ';' before 'int'
   14 |   int Bob = 0
      |   ^~~
a.cc:15:17: error: 'i' was not declared in this scope
   15 |   for (int = 0; i < N; i++) {
      |                 ^
a.cc:23:19: error: 'Bob' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |                   ^~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n); for(int (i)=0;(i)<(n);(i)++)
using namespace std;
 
int main(){
  int n; cin>>n;
  vector<int> num(n);
  
  rep(i,n) cin>>num[i];
  sort(num.begin(),num.end());
  
  int ans=0+
  int b=0;
  for (int i=0;i<n;i++){
    b = num[i]- num[i+1];
    ans += b;
  }
  
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:3: error: expected primary-expression before 'int'
   13 |   int b=0;
      |   ^~~
a.cc:15:5: error: 'b' was not declared in this scope
   15 |     b = num[i]- num[i+1];
      |     ^
Language: C++

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

int main{
  int n;cin>>n;
  vector<int> num(n);
  
  rep(i.n) cin>>num[i];
  sort(num.begin,num.end);
  
  vector<int> sa(n-1);
  
  for(int i=1;i<n;i++){
    sa[i-1] = num[i] - num[i-1];
  }
  int ans=0
  rep(i,n-1)ans += sa[i];
  
  cout << ans << endl;
  return 0;
}
  
  
  
  

Compiler output:
a.cc:9:10: error: macro "rep" requires 2 arguments, but only 1 given
    9 |   rep(i.n) cin>>num[i];
      |          ^
a.cc:2:9: note: macro "rep" defined here
    2 | #define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
      |         ^~~
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:3: error: expected primary-expression before 'int'
    6 |   int n;cin>>n;
      |   ^~~
a.cc:6:3: error: expected '}' before 'int'
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:6:9: error: 'cin' does not name a type
    6 |   int n;cin>>n;
      |         ^~~
a.cc:7:19: error: 'n' was not declared in this scope; did you mean 'yn'?
    7 |   vector<int> num(n);
      |                   ^
      |                   yn
a.cc:9:3: error: 'rep' does not name a type
    9 |   rep(i.n) cin>>num[i];
      |   ^~~
a.cc:10:7: error: expected constructor, destructor, or type conversion before '(' token
   10 |   sort(num.begin,num.end);
      |       ^
a.cc:12:18: error: 'n' was not declared in this scope; did you mean 'yn'?
   12 |   vector<int> sa(n-1);
      |                  ^
      |                  yn
a.cc:14:3: error: expected unqualified-id before 'for'
   14 |   for(int i=1;i<n;i++){
      |   ^~~
a.cc:14:15: error: 'i' does not name a type
   14 |   for(int i=1;i<n;i++){
      |               ^
a.cc:14:19: error: 'i' does not name a type
   14 |   for(int i=1;i<n;i++){
      |                   ^
a.cc:2:18: error: expected ',' or ';' before 'for'
    2 | #define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
      |                  ^~~
a.cc:18:3: note: in expansion of macro 'rep'
   18 |   rep(i,n-1)ans += sa[i];
      |   ^~~
a.cc:2:35: error: expected constructor, destructor, or type conversion before '<' token
    2 | #define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
      |                                   ^
a.cc:18:3: note: in expansion of macro 'rep'
   18 |   rep(i,n-1)ans += sa[i];
      |   ^~~
a.cc:2:43: error: expected constructor, destructor, or type conversion before '++' token
    2 | #define rep(i,n) for(int (i)=0;(i)<(n);(i)++)
      |                                           ^~
a.cc:18:3: note: in expansion of macro 'rep'
   18 |   rep(i,n-1)ans += sa[i];
      |   ^~~
a.cc:20:3: error: 'cout' does not name a type
   20 |   cout << ans << endl;
      |   ^~~~
a.cc:21:3: error: expected unqualified-id before 'return'
   21 |   return 0;
      |   ^~~~~~
a.cc:22:1: error: expected declaration before '}' token
   22 | }
      | ^
Language: C++

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

int main(){
 int N;
  cin >> N;
 int a[110];
  for (int i = 0; i < N ; i++) cin >> a[i];
  
  sort (a, a+N, greater<int>);
  
  int Alice = 0; 
  int Bob = 0;
  for (int i = 0; i < N ; i++){
    if (i % 2 == 0) {
      Alice = Alice + a[i];
    }else{
      Bob = Bob + a[i];
  }
  }
  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:29: error: expected primary-expression before ')' token
   10 |   sort (a, a+N, greater<int>);
      |                             ^
Language: C++

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

int main() {
  int a,i,b,c;
  cin>>a;
  vector<int> vec(a);
  for(i=0;i<a;i++){
    cin>>vec.at(i);
  }
  
  sort(vec.begin(), vec.end());
  reverse(vec.begin(), vec.end());

  for (int i = 0; i < vec.size(); i++) {
      if(i%2==0)
        a+=vec.size(i);
      else
        b+=vec.size(i);
  }
  cout<<a-b;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:20: error: no matching function for call to 'std::vector<int>::size(int&)'
   17 |         a+=vec.size(i);
      |            ~~~~~~~~^~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:992:7: note: candidate: 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]'
  992 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/stl_vector.h:992:7: note:   candidate expects 0 arguments, 1 provided
a.cc:19:20: error: no matching function for call to 'std::vector<int>::size(int&)'
   19 |         b+=vec.size(i);
      |            ~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:992:7: note: candidate: 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]'
  992 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/stl_vector.h:992:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

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

int main() {
  int a;
  cin>>a;
  vector<int> vec(a);
  for(i=0;i<a;i++){
    cin>>vec.at(i);
  }
  
  sort(vec.begin(), vec.end());
  reverse(vec.begin(), vec.end());

  for (int i = 0; i < vec.size(); i++) {
      if(i%2==0)
        a+=vec.size(i)
      else
        b+=vec.size(i)
  }
  cout<<a-b;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: 'i' was not declared in this scope
    8 |   for(i=0;i<a;i++){
      |       ^
a.cc:17:20: error: no matching function for call to 'std::vector<int>::size(int&)'
   17 |         a+=vec.size(i)
      |            ~~~~~~~~^~~
In file included from /usr/include/c++/14/vector:66,
                 from /usr/include/c++/14/functional:64,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_vector.h:992:7: note: candidate: 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = int; _Alloc = std::allocator<int>; size_type = long unsigned int]'
  992 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/stl_vector.h:992:7: note:   candidate expects 0 arguments, 1 provided
a.cc:21:11: error: 'b' was not declared in this scope
   21 |   cout<<a-b;
      |           ^
Language: C

#include<stdio.h>

int main(){
    int N=0,Alice=0,Bob=0;
    int A[N];

    scanf("%d",&N);
    if(scanf("%d/%d", &numerator, &denominator) < 2) {
    fprintf(stderr, "error: ill-formed fraction.\n");
    exit(1);
}
    for(int i=0;i<N;i++){
        scanf("%d",&A[i]);
        if(scanf("%d/%d", &numerator, &denominator) < 2) {
    fprintf(stderr, "error: ill-formed fraction.\n");
    exit(1);
}
    }

    int temp=0;
    for(int i=0;i<N;i++){
        for(int j=i+1;j<N;j++){
            if(A[i]<A[j]){
                temp = A[j];
                A[j] = A[i];
                A[i] = temp;
            }
        }
    }
    for(int i=0;i<N;i++){
        if(i%2 == 0){
            Alice += A[i];
        }
        else{
            Bob += A[i];
        }
    }

    printf("%d\n",Alice-Bob);
}

Compiler output:
main.c: In function 'main':
main.c:8:24: error: 'numerator' undeclared (first use in this function)
    8 |     if(scanf("%d/%d", &numerator, &denominator) < 2) {
      |                        ^~~~~~~~~
main.c:8:24: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:36: error: 'denominator' undeclared (first use in this function)
    8 |     if(scanf("%d/%d", &numerator, &denominator) < 2) {
      |                                    ^~~~~~~~~~~
main.c:10:5: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
   10 |     exit(1);
      |     ^~~~
main.c:2:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
    1 | #include<stdio.h>
  +++ |+#include <stdlib.h>
    2 | 
main.c:10:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   10 |     exit(1);
      |     ^~~~
main.c:10:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
main.c:16:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   16 |     exit(1);
      |     ^~~~
main.c:16:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
Language: C++

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

int main() {
  int N;
  cin>>N;
  vector<int> a(N);
  for(int i =0;i<N;i++){
    cin>>a.at(i);
  }
  sort.(a.begin(),a.end());
  reverse.(a.begin(),a.end());
  int sum1=0;
  int sum2=0;
  for (int i=0;i<N;i++){
    if (i%2==0){
      sum1+=a.at(i);
    }
    else{
      sum2+=a.at(i);
    }
  }
  cout<<sum1-sum2<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:8: error: expected unqualified-id before '(' token
   11 |   sort.(a.begin(),a.end());
      |        ^
a.cc:12:11: error: expected unqualified-id before '(' token
   12 |   reverse.(a.begin(),a.end());
      |           ^
Language: C++

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

int main() {
  int N;
  cin>>N;
  vector<int> a(N)
  for(int i =0;i<N;i++){
    cin>>a.at(i);
  }
  sort.(a.begin(),a.end());
  reverse.(a.begin(),a.end());
  int sum1=0;
  int sum2=0;
  for (int i=0;i<N;i++){
    if (i%2==0){
      sum1+=a.at(i);
    }
    else{
      sum2+=a.at(i);
    }
  }
  cout<<sum1-sum2<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'for'
    8 |   for(int i =0;i<N;i++){
      |   ^~~
a.cc:8:16: error: 'i' was not declared in this scope
    8 |   for(int i =0;i<N;i++){
      |                ^
a.cc:11:8: error: expected unqualified-id before '(' token
   11 |   sort.(a.begin(),a.end());
      |        ^
a.cc:12:11: error: expected unqualified-id before '(' token
   12 |   reverse.(a.begin(),a.end());
      |           ^
Language: C++

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

int main() {
  int N;
  cin>>N;
  vector<int> a(N)
  for(int i =0;i<N;i++){
    cin>>a.at(i);
  }
  sort.(a.begin(),a.end());
  reverse(a.begin(),a.end());
  int sum1=0;
  int sum2=0;
  for (int i=0;i<N;i++){
    if (i%2==0){
      sum1+=a.at(i);
    }
    else{
      sum2+=a.at(i);
    }
  }
  cout<<sum1-sum2<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'for'
    8 |   for(int i =0;i<N;i++){
      |   ^~~
a.cc:8:16: error: 'i' was not declared in this scope
    8 |   for(int i =0;i<N;i++){
      |                ^
a.cc:11:8: error: expected unqualified-id before '(' token
   11 |   sort.(a.begin(),a.end());
      |        ^
Language: C++

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

int main() {
  int N , i;
  int ret = 0;
  cin >> N;
vector<int> vec(N);
  for (i = 0; i < N; i++) {
    cin >> vec.at(i);
  }
  sort(vec.begin(),vec.end())
    reverse(vec.begin(), vec.end())
  for(int j = 0; j < vec.size();j++){
    if( i % 2 == 1)
      ret += vec.at(i);
      else{
        ret = ret;
    }
    }
  cout << ret;
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:12:30: error: expected ';' before 'reverse'
   12 |   sort(vec.begin(),vec.end())
      |                              ^
      |                              ;
   13 |     reverse(vec.begin(), vec.end())
      |     ~~~~~~~                   
a.cc:14:18: error: 'j' was not declared in this scope
   14 |   for(int j = 0; j < vec.size();j++){
      |                  ^
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main() {
int n,A=0,B=0; cin >> n;
  vector<int> a(n);
  for(int i=0;i<n;i++) {
    cin >> n;
  }
  sort(a.begin(),a.end());
  for(int i=0;i<n;i+=2) {
    A+=a.at(i);
    B+=a.at(i+1);
  }
  if(A<B){
    cout << B-A << endl;
  }
  else {
    cout << A-B << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   10 |   sort(a.begin(),a.end());
      |   ^~~~
      |   short
Language: C++

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

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

  sort(a, a+n);
  int bob = 0, alice = 0;

  for(int i = n-1; i >= 0; i -= 2){
    alice += a[i];
  }

  bob = w - alice;
  cout << alice - bob << endl;


}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:3: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   16 |   sort(a, a+n);
      |   ^~~~
      |   sqrt
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> a(N);
  for(int i=0;i<N;i++)cin >> a[i];
  sort(a.rbegin(),a.rend());
  int sum=0;
  for(int i=0;i<N;i--){
    if(i%2==0){
      sum+=a[i]
    }
    else sum-=a[i]
  }
  cout << sum;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: expected ';' before '}' token
   13 |       sum+=a[i]
      |                ^
      |                ;
   14 |     }
      |     ~           
a.cc:15:19: error: expected ';' before '}' token
   15 |     else sum-=a[i]
      |                   ^
      |                   ;
   16 |   }
      |   ~
Language: C++

#include<iostream>
using namespace std;

int(){
  int N;
  int d[101];
  cin >> N;
  for(int i=0;i<N;i++) cin >> d[i];
  
  int num[101] = {0};
  for(int i=0;i<N;i++){
    num[d[i]]++;
  }
  int res = 0;
  for(int i=1;i<=N;i++){
    if(num[i])res++;
  }
  cout << res << endl;
}

Compiler output:
a.cc:4:5: error: expected unqualified-id before ')' token
    4 | int(){
      |     ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  
  vector<int> a;
  for (int i = 0; i < N; i++) {
    cin >> a.at(i);
  }
  
  sort(a.begin(), a.end());
  reverse(sort(a.begin(), a.end());
  
  int alice = 0, bob = 0;
  for (int i = 0; i < N; i++) {
    if (i % 2 == 0) alice += a.at(i);
    else bob += a.at(i);
  }
  
  cout << alice - bob << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:35: error: expected ')' before ';' token
   14 |   reverse(sort(a.begin(), a.end());
      |          ~                        ^
      |                                   )
Language: C++

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

int main() {
  int N;
  cin >> N;
  
  vector<int> a;
  for (int i = 0; i < N; i++) {
    cin >> a.at(i);
  }
  
  sort(a.begin(), a.end());
  reverse(sort(a.begin(), a.end()));
  
  int alice = 0, bob = 0;
  for (int i = 0; i < N; i++) {
    if (i % 2 == 0) alice += a.at(i);
    else bob += a.at(i);
  }
  
  cout << alice - bob << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:15: error: invalid use of void expression
   14 |   reverse(sort(a.begin(), a.end()));
      |           ~~~~^~~~~~~~~~~~~~~~~~~~
Language: C++


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

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

	vector<int> vec,(N);
	int i;
	for (i = 0; i < N; i++) {
		if (i % 2 == 0) {
			vector<int> a = { i };
			sort(a.begin(), a.end());
			reverse(a.begin(), a.end());
		}
		else {
			vector<int> b = { i };
			sort(b.begin(), b.end());
		}
		vector<int> a = { i };
		vector<int> b = { i };
		cout << a.at(0) - b.at(0) << endl;
	

	}

}



Compiler output:
a.cc: In function 'int main()':
a.cc:11:26: error: conflicting declaration 'std::vector<int> N'
   11 |         vector<int> vec,(N);
      |                          ^
a.cc:8:13: note: previous declaration as 'int N'
    8 |         int N;
      |             ^
Language: C++

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

int main() {
  int N;
  cin>>N;
  
  vector<int> vec(N);
  for (int i=0;i<N;i++) {
    cin >> vec.at(i);
  }
  int A=0,B=0;
  sort(vec.begin(), vec.end());
  reverse(vec.begin(), vec.end());
  for (int i=0;i<N;i++) {
    if ((i+1)%2=1) {
      A+=vec.at(i);
    }
    else {
      B+=vec.at(i);
    }
  }
cout << A -B << endl;    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:14: error: lvalue required as left operand of assignment
   16 |     if ((i+1)%2=1) {
      |         ~~~~~^~
Language: C++

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



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

	int ans,Alice,Bob;
	vector<int> A[n];

	for(int i=0;i<n;i++){
		cin>>A.at(i);
	}

	sort(A.begin(), A.end(),greater<int>);

	for(int i=0;i<n;i++){
		if(i%2==0){
			Alice += A[i];
		}else{
			Bob += A[i];
		}

	}


	ans = Alice-Bob;
	cout << ans;
	
	
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:24: error: request for member 'at' in 'A', which is of non-class type 'std::vector<int> [n]'
   14 |                 cin>>A.at(i);
      |                        ^~
a.cc:17:16: error: request for member 'begin' in 'A', which is of non-class type 'std::vector<int> [n]'
   17 |         sort(A.begin(), A.end(),greater<int>);
      |                ^~~~~
a.cc:17:27: error: request for member 'end' in 'A', which is of non-class type 'std::vector<int> [n]'
   17 |         sort(A.begin(), A.end(),greater<int>);
      |                           ^~~
a.cc:17:45: error: expected primary-expression before ')' token
   17 |         sort(A.begin(), A.end(),greater<int>);
      |                                             ^
a.cc:21:31: error: no match for 'operator+=' (operand types are 'int' and 'std::vector<int>')
   21 |                         Alice += A[i];
      |                         ~~~~~~^~~~~~~
a.cc:23:29: error: no match for 'operator+=' (operand types are 'int' and 'std::vector<int>')
   23 |                         Bob += A[i];
      |                         ~~~~^~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define print(x) cout << (x) << endl;
int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    int N;
    cin >> N;
    vector<int> a(N);
    for (int i = 0; i < N; i++) {
        cin >> a.at(i)
    }
    sort(a.begin(), a.end());
    int A = 0, B = 0;
    if (i % 2 == 0) {
        for (int i = 0; i < N; i += 2) {
            A += a.at(i);
            B += a.at(i + 1);
        }
    }
    else {
        for (int i = 0; i < N - 1; i += 2) {
            A += a.at(i);
            B += a.at(i + 1);
        }
        A += a.at(N)
    }
    cout << A - B << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: error: expected ';' before '}' token
   11 |         cin >> a.at(i)
      |                       ^
      |                       ;
   12 |     }
      |     ~                  
a.cc:15:9: error: 'i' was not declared in this scope
   15 |     if (i % 2 == 0) {
      |         ^
a.cc:26:21: error: expected ';' before '}' token
   26 |         A += a.at(N)
      |                     ^
      |                     ;
   27 |     }
      |     ~
Language: C++


  
  
  
    cin>>N;
  
  vector<int>a(N);

  for(int i=0;i<N;i++){
    cin>>a.at(i);
  }
  

  sort(a.begin(),a.end());
  
  int A=0;
  int B=0;
   for(int i=0;i<N;i++){
     if(i%2==0){
       A+=a.at(i);
     }
     else{
       B+=a.at(i);
     }
   }
  

cout<<abs(A-B)<<endl;
}

Compiler output:
a.cc:5:5: error: 'cin' does not name a type
    5 |     cin>>N;
      |     ^~~
a.cc:7:3: error: 'vector' does not name a type
    7 |   vector<int>a(N);
      |   ^~~~~~
a.cc:9:3: error: expected unqualified-id before 'for'
    9 |   for(int i=0;i<N;i++){
      |   ^~~
a.cc:9:15: error: 'i' does not name a type
    9 |   for(int i=0;i<N;i++){
      |               ^
a.cc:9:19: error: 'i' does not name a type
    9 |   for(int i=0;i<N;i++){
      |                   ^
a.cc:14:7: error: expected constructor, destructor, or type conversion before '(' token
   14 |   sort(a.begin(),a.end());
      |       ^
a.cc:18:4: error: expected unqualified-id before 'for'
   18 |    for(int i=0;i<N;i++){
      |    ^~~
a.cc:18:16: error: 'i' does not name a type
   18 |    for(int i=0;i<N;i++){
      |                ^
a.cc:18:20: error: 'i' does not name a type
   18 |    for(int i=0;i<N;i++){
      |                    ^
a.cc:28:1: error: 'cout' does not name a type
   28 | cout<<abs(A-B)<<endl;
      | ^~~~
a.cc:29:1: error: expected declaration before '}' token
   29 | }
      | ^
Language: C++

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


int main() {
    vector <int> a;
    int N;
    int sum1 = 0;
    int sum2 = 0;
    cin >> N;
    for(int i=0;i<N;++i;){
        cin >> a.at(i);
    }
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());
    
    for(int i=0;i<N;++i){
        if(i%2==0){
            sum1 += a.at(i);
        }
        else{
            sum2 += a.at(i);
        }
        
    }
    cout << sum1-sum2 <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: expected ')' before ';' token
   11 |     for(int i=0;i<N;++i;){
      |        ~               ^
      |                        )
a.cc:11:25: error: expected primary-expression before ')' token
   11 |     for(int i=0;i<N;++i;){
      |                         ^
Language: C++

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

vector <int> a;
int main() {
    int N;
    int sum1 = 0;
    int sum2 = 0;
    cin >> N;
    for(int i=0;i<N;++i;){
        cin >> a[i];
    }
    sort(a.begin(), a.end());
    reverse(a.begin(), a.end());
    
    for(int i=0;i<N;++i){
        if(i%2==0){
            sum1 += a[i];
        }
        else{
            sum2 += a[i];
        }
        cout << sum1-sum2 <<endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: expected ')' before ';' token
   10 |     for(int i=0;i<N;++i;){
      |        ~               ^
      |                        )
a.cc:10:25: error: expected primary-expression before ')' token
   10 |     for(int i=0;i<N;++i;){
      |                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std+
  
int main(){
  int N;
  cin >> N;
  vector<int> a(N);
  for(int i = 0;i < N;i++){
    cin >> a.at(i);
  }
  sort(a.begin(),a.end());
  int scoreA,scoreB;
  for(int k = 0;2 * k < N;k++){
    scoreA += a.at(2 * k - 1);
    scoreB += a.at(2 * k);
  }
  cout << scoreA - scoreB << endl;
}

Compiler output:
a.cc:2:20: error: expected ';' before '+' token
    2 | using namespace std+
      |                    ^
      |                    ;
a.cc:2:20: error: expected unqualified-id before '+' token
Language: C++

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

int main(){
  int N;
  int list[110]=0;

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

  sort(list,list+N,greater<int>());
  int Alice,Bob;
  
  for(int i=0; i*2<N;i++){
    Alice = list[i*2];
    Bob =list[2*i+1];
  }
  
 cout << Alice-Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:17: error: array must be initialized with a brace-enclosed initializer
    6 |   int list[110]=0;
      |                 ^
Language: Java

import java.util.Arrays;
import java.util.Scanner;

public class Main007 {

	public static void main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ
		Scanner sc = new Scanner(System.in);
		int Alice = 0;
		int Bob = 0;
		int n = sc.nextInt();
		int []a = new int [n];
		
		for (int i = 0; i < n ; i++) {
			a[i] = sc.nextInt();	
		}
		 Arrays.sort(a);
		 if (n % 2 ==0)
		for(int i = 1 ; i < n ; i++) {
			Alice += a[n - i];
			Bob += a[n - i - 1];					
		}
		 if (n % 2 == 1) {
		for(int i = 1; i < n - 1 ; i++) {
			Alice += a[n - i];
			Bob += a[n - i -1];					
		}
		    Alice += a[0];
		 }
		 
		System.out.println((Alice - Bob));
		
	}
			
	}




Compiler output:
Main.java:4: error: class Main007 is public, should be declared in a file named Main007.java
public class Main007 {
       ^
1 error
Language: C++

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

int main()
{
  int N;
  vector<int> a;
  scanf("%d", &N);
  a.resize(N);
  for (int i = 0; i < N; i++)
  {
    scanf("%d", &a[i]);
  }
  sort(a.begin(), a.end(), greater<int>());
  int alice = 0;
  int bob = 0;
  for (int i = 0; i < N; i++)
  {
    if (i % 2 == 0)
    {
      alice += a[i];
    }
    else
    {
      bob += a[i];
    }
  }
  printf("%d\n", alice - bob);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   15 |   sort(a.begin(), a.end(), greater<int>());
      |   ^~~~
      |   short
Language: C++

#include<iostream>
using namespace std;

int main(){
  int n,a,b;
  a=0;
  b=0;
  cin>>n;
  vector<int> vec[n];
  
  for(int i=0;i<n;i++){
    cin>>vec[i];
  }
  
  sort(vec.begin(),vec.end());
  reverse(vec.begin(),vec.end());
  
  for(int i=0;i<n;i++){
    if(i%2==0) a += vec[i];
    else b += vec[i];
  }
  
  cout<<a-b<<endl;
  return 0;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'vector' was not declared in this scope
    9 |   vector<int> vec[n];
      |   ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:9:10: error: expected primary-expression before 'int'
    9 |   vector<int> vec[n];
      |          ^~~
a.cc:12:10: error: 'vec' was not declared in this scope
   12 |     cin>>vec[i];
      |          ^~~
a.cc:15:8: error: 'vec' was not declared in this scope
   15 |   sort(vec.begin(),vec.end());
      |        ^~~
a.cc:15:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   15 |   sort(vec.begin(),vec.end());
      |   ^~~~
      |   short
a.cc:16:3: error: 'reverse' was not declared in this scope
   16 |   reverse(vec.begin(),vec.end());
      |   ^~~~~~~
Language: C++

#include<iostream>
using namespace std;

int main(){
  int n,a,b;
  a=0;
  b=0;
  vector<int> vec[100];
  cin>>n;
  
  for(int i=0;i<n;i++){
    cin>>vec[i];
  }
  
  sort(vec.begin(),vec.end());
  reverse(vec.begin(),vec.end());
  
  for(int i=0;i<n;i++){
    if(i%2==0) a += vec[i];
    else b += vec[i];
  }
  
  cout<<a-b<<endl;
  return 0;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'vector' was not declared in this scope
    8 |   vector<int> vec[100];
      |   ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:8:10: error: expected primary-expression before 'int'
    8 |   vector<int> vec[100];
      |          ^~~
a.cc:12:10: error: 'vec' was not declared in this scope
   12 |     cin>>vec[i];
      |          ^~~
a.cc:15:8: error: 'vec' was not declared in this scope
   15 |   sort(vec.begin(),vec.end());
      |        ^~~
a.cc:15:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   15 |   sort(vec.begin(),vec.end());
      |   ^~~~
      |   short
a.cc:16:3: error: 'reverse' was not declared in this scope
   16 |   reverse(vec.begin(),vec.end());
      |   ^~~~~~~