criyle/codenet-compile-errors huggingface dataset:
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());
      |   ^~~~~~~
a.cc:24:12: error: expected '}' at end of input
   24 |   return 0;
      |            ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <numeric>
#include <tuple>
#include <stack>

#define rep(i,n) for (int i = 0; i < (n); ++i)
#define all(x) x.begin(),x.end()
#define rall(x) x.rbegin(),x.rend()
#define print(s) cout << s << endl
typedef long long ll;
using namespace std;

int ctoi(char c) {
	if (c >= '0' && c <= '9') {
		return c - '0';
	}
	return 0;
}

int main() {
	int n; cin >> n;
	vector<int> v(n);
	rep(i,n) cin >> v[i];
	sort(rall(v));
	int cout1 =0;
	int count2=0;
	rep(i,n){
		if (i%2==0){
			count2 += v[i];
		}else{
			count1 += v[i];
		}
	}
	cout << count1 - count2 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:36:25: error: 'count1' was not declared in this scope; did you mean 'count2'?
   36 |                         count1 += v[i];
      |                         ^~~~~~
      |                         count2
a.cc:39:17: error: 'count1' was not declared in this scope; did you mean 'count2'?
   39 |         cout << count1 - count2 << endl;
      |                 ^~~~~~
      |                 count2
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 counta = 0;
  int countb = 0;
  
  for (int i = 0,i < N, i++) {
   if ((i+1)%2 == 1) {
    counta+=vec.at(i);
   }
   else {
    countb+=vec.at(i);
   }
  }
  
  cout << counta - countb << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: expected ';' before '<' token
    8 |   for (int i = 0,i < N, i++) {
      |                   ^~
      |                   ;
a.cc:8:20: error: expected primary-expression before '<' token
    8 |   for (int i = 0,i < N, i++) {
      |                    ^
a.cc:8:28: error: expected ';' before ')' token
    8 |   for (int i = 0,i < N, i++) {
      |                            ^
      |                            ;
a.cc:17:19: error: expected ';' before '<' token
   17 |   for (int i = 0,i < N, i++) {
      |                   ^~
      |                   ;
a.cc:17:20: error: expected primary-expression before '<' token
   17 |   for (int i = 0,i < N, i++) {
      |                    ^
a.cc:17:28: error: expected ';' before ')' token
   17 |   for (int i = 0,i < N, i++) {
      |                            ^
      |                            ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N;
  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() );
  int counta = 0;
  int countb = 0;
  
  for (i = 0,i < N, i++) {
   if ((i+1)%2 == 1) {
    counta+=vec.at(i)
   }
   else {
    countb+=vec.at(i)
   }
  }
  
  cout << counta - countb << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: 'i' was not declared in this scope
    8 |   for (i = 0,i < N, i++) {
      |        ^
a.cc:12:7: error: could not convert 'std::sort<__gnu_cxx::__normal_iterator<int*, vector<int> > >(vec.std::vector<int>::begin(), vec.std::vector<int>::end())' from 'void' to 'bool'
   12 |   sort( vec.begin(), vec.end() );
      |   ~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
      |       |
      |       void
a.cc:13:36: error: expected ')' before ';' token
   13 |   reverse( vec.begin(), vec.end() );
      |                                    ^
      |                                    )
a.cc:8:7: note: to match this '('
    8 |   for (i = 0,i < N, i++) {
      |       ^
a.cc:17:8: error: 'i' was not declared in this scope
   17 |   for (i = 0,i < N, i++) {
      |        ^
a.cc:28:1: error: expected primary-expression before '}' token
   28 | }
      | ^
a.cc:26:35: error: expected ')' before '}' token
   26 |   cout << counta - countb << endl;
      |                                   ^
      |                                   )
   27 | 
   28 | }
      | ~                                  
a.cc:17:7: note: to match this '('
   17 |   for (i = 0,i < N, i++) {
      |       ^
a.cc:28:1: error: expected primary-expression before '}' token
   28 | }
      | ^
Language: C++

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

int main(){
  int N;cin>>N;
  vector <int> v(N);
  for(auto a:v) cin >> a;
  sort(v.begin(),v.end(),[&](int x, int y){ return x>y;});
  int ans;
  for (int i;i<N;++i){
    if(i&1) ans -= v[i];
    else    ans += v[i];
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'sort' was not declared in this scope; did you mean 'short'?
    9 |   sort(v.begin(),v.end(),[&](int x, int y){ return x>y;});
      |   ^~~~
      |   short
Language: C++

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

int main(){
  int N;cin>>N;
  vector <int> v(N);
  for(auto a:v) cin >> a;
  sort(v.begin(),v.end(),[](int x, int y){ return x>y;});
  int ans;
  for (int i;i<N;++i){
    if(i&1) ans -= v[i];
    else    ans += v[i];
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'sort' was not declared in this scope; did you mean 'short'?
    9 |   sort(v.begin(),v.end(),[](int x, int y){ return x>y;});
      |   ^~~~
      |   short
Language: C++

#include<algorithm>
using namespace std;
#include<stdio.h>
int main(void)
{
	//ソート（並び替え）
	int N,a[100];
	scanf("%d", &N);
	for (int i = 0; i < N; i++) {
		scanf("%d", &a[i]);
	}
	sort(a, a + N,greater<int>());//小さい順に並び変えられる
	int suma = 0, sumb = 0;
	
	for (int j = 0; j < N; j++) {
		if (j % 2 == 1) {
			sumb = sumb + a[j];
		}
		else
			suma = suma + a[j];
	}

	if (suma >= sumb) {
		printf("%d", suma - sumb);
	}
	else
		printf("%d", sumb - suma);

	return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:23: error: 'greater' was not declared in this scope
   12 |         sort(a, a + N,greater<int>());//小さい順に並び変えられる
      |                       ^~~~~~~
a.cc:12:31: error: expected primary-expression before 'int'
   12 |         sort(a, a + N,greater<int>());//小さい順に並び変えられる
      |                               ^~~
Language: C++

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

using namespace std;

int main(){
  int i,n,j,a,b;
  vector <int> v;
  
  cin>>n;
  for(i=0;i<n;i++){
    cin>>j;
    v.push_back(j);
  }
  
  sort(v.begin(),v.end(),greater<int> ());
  for(i=0;i<n;i+=2)
    a+=v[i];
  for(i=1;i<ni+=2)
    b+=v[i];
  
  cout<<a-b<<endl;
  return 0;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:13: error: 'ni' was not declared in this scope; did you mean 'n'?
   20 |   for(i=1;i<ni+=2)
      |             ^~
      |             n
a.cc:20:18: error: expected ';' before ')' token
   20 |   for(i=1;i<ni+=2)
      |                  ^
      |                  ;
Language: C++

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

using namespace std;

int main(){
  int i,n,j,a,b;
  vector <int> v;
  
  cin>>n;
  if(i=0;i<n;i++){
    cin>>j;
    v.push_back(j);
  }
  
  sort(v.begin(),v.end(),greater<int> ());
  for(i=0;i<n;i+=2)
    a+=v[i];
  for(i=1;i<ni+=2)
    b+=v[i];
  
  cout<<a-b<<endl;
  return 0;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:13: error: expected ')' before ';' token
   12 |   if(i=0;i<n;i++){
      |     ~       ^
      |             )
a.cc:12:17: error: expected ';' before ')' token
   12 |   if(i=0;i<n;i++){
      |                 ^
      |                 ;
a.cc:20:13: error: 'ni' was not declared in this scope; did you mean 'n'?
   20 |   for(i=1;i<ni+=2)
      |             ^~
      |             n
a.cc:20:18: error: expected ';' before ')' token
   20 |   for(i=1;i<ni+=2)
      |                  ^
      |                  ;
Language: C++

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

int main (){
int N;
  vector<int>a(101);
cin >> 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,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:12:10: error: no matching function for call to 'reverse(<unresolved overloaded function type>, std::vector<int>::iterator)'
   12 |   reverse(a.begin,a.end());
      |   ~~~~~~~^~~~~~~~~~~~~~~~~
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: 'void std::reverse(_BIter, _BIter) [with _BIter = __gnu_cxx::__normal_iterator<int*, vector<int> >]'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |     ^~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1083:36: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to '__gnu_cxx::__normal_iterator<int*, std::vector<int> >'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
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, 2 provided
Language: C++

#include <iostream>
#include <vector>
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>());
	int alice =0;
	int bob=0;
	
	for(int i=0;i<N;i++){
		//alice
		if(i%2==0)alice +=a[i];
		if(i%2==1)bob +=a[i];
	}
	
	cout << alice - bob<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |         sort(a,a + N,greater<int>());
      |         ^~~~
      |         short
Language: C++

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

using namespace std;
int main()
{
	int N, a[100] = {}, bobsum = 0, alicesum = 0, maxP = 0, tmp = 0;
	bool aliceflag = true,loopflag = true;
	cin >> N;
	for (int i = 0; i < N; i++) { cin >> a[i]; }cnt = -1; 
	while (loopflag) {
		if (aliceflag) {
			for (int i = 0; i < N; i++) { maxP = max(a[i], a[i + 1]); }
			for (int i = 0; i < N; i++) { if (maxP == a[i])tmp = i; }
			alicesum += maxP;
			aliceflag = false;
		}
		else if (!(aliceflag)) {
			for (int i = 0; i < N; i++) { maxP = max(a[i], a[i + 1]); }
			for (int i = 0; i < N; i++) { if (maxP == a[i])tmp = i; }
			bobsum += maxP;
			aliceflag = true;
		}
		if (a[tmp] == 0)loopflag = false;
		else
		{
			a[tmp] = 0;
		}
	}
	cout << alicesum-bobsum << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:53: error: 'cnt' was not declared in this scope; did you mean 'int'?
   12 |         for (int i = 0; i < N; i++) { cin >> a[i]; }cnt = -1;
      |                                                     ^~~
      |                                                     int
Language: C++

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

using namespace std;
int main()
{
	int N, a[100] = {}, bobsum, alicesum;
	cin >> N;
	for (int i = 0; i < N; i++)cin >> a[i];
	for (int i = 0; i < N; i += 2) { alicesum += a[i]; bobsum += a[i+1] }
	cout << alicesum - bobsum << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:76: error: expected ';' before '}' token
   12 |         for (int i = 0; i < N; i += 2) { alicesum += a[i]; bobsum += a[i+1] }
      |                                                                            ^~
      |                                                                            ;
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  
  for(int i = 0; i < a.size(); i++) cin >> a.at(i);
  
  sort(a.begin(),a.end());
  reverse(a.begin,a.end());
  
  int Alice = 0;
  int 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:12:10: error: no matching function for call to 'reverse(<unresolved overloaded function type>, std::vector<int>::iterator)'
   12 |   reverse(a.begin,a.end());
      |   ~~~~~~~^~~~~~~~~~~~~~~~~
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: 'void std::reverse(_BIter, _BIter) [with _BIter = __gnu_cxx::__normal_iterator<int*, vector<int> >]'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |     ^~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1083:36: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to '__gnu_cxx::__normal_iterator<int*, std::vector<int> >'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
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, 2 provided
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(n);
  
  for(int i = 0; i < a.size(); i++) cin >> a.at(i);
  
  sort(a.begin(),vec.end());
  reverse(a.begin,vec.end());
  
  int Alice = 0;
  int 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:11:18: error: 'vec' was not declared in this scope
   11 |   sort(a.begin(),vec.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 < a.size(); i++) cin >> a.at(i);
  
  sort(a.begin(),vec.end());
  reverse(a.begin,vec.end());
  
  int Alice = 0;
  int 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:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> n;
      |   ^~~
a.cc:7:3: error: 'vector' was not declared in this scope
    7 |   vector<int> a(n);
      |   ^~~~~~
a.cc:7:10: error: expected primary-expression before 'int'
    7 |   vector<int> a(n);
      |          ^~~
a.cc:9:22: error: 'a' was not declared in this scope
    9 |   for(int i = 0; i < a.size(); i++) cin >> a.at(i);
      |                      ^
a.cc:11:8: error: 'a' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |        ^
a.cc:11:18: error: 'vec' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |                  ^~~
a.cc:11:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |   sort(a.begin(),vec.end());
      |   ^~~~
      |   short
a.cc:12:3: error: 'reverse' was not declared in this scope
   12 |   reverse(a.begin,vec.end());
      |   ^~~~~~~
a.cc:23:3: error: 'cout' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |   ^~~~
a.cc:23:26: error: 'endl' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |                          ^~~~
Language: C++

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

int main(){
  int n;
  vector<int> a(n);
  cin >> n;
  
  for(int i = 0; i < a.size(); i++) cin >> a.at(i);
  
  sort(a.begin(),vec.end());
  reverse(a.begin,vec.end());
  
  int Alice = 0;
  int 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:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<int> a(n);
      |   ^~~~~~
a.cc:6:10: error: expected primary-expression before 'int'
    6 |   vector<int> a(n);
      |          ^~~
a.cc:7:3: error: 'cin' was not declared in this scope
    7 |   cin >> n;
      |   ^~~
a.cc:9:22: error: 'a' was not declared in this scope
    9 |   for(int i = 0; i < a.size(); i++) cin >> a.at(i);
      |                      ^
a.cc:11:8: error: 'a' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |        ^
a.cc:11:18: error: 'vec' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |                  ^~~
a.cc:11:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |   sort(a.begin(),vec.end());
      |   ^~~~
      |   short
a.cc:12:3: error: 'reverse' was not declared in this scope
   12 |   reverse(a.begin,vec.end());
      |   ^~~~~~~
a.cc:23:3: error: 'cout' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |   ^~~~
a.cc:23:26: error: 'endl' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |                          ^~~~
Language: C++

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

int main(){
  int n;
  vector<int> a;
  cin >> n;
  
  for(int i = 0; i < a.size(); i++) cin >> a.at(i);
  
  sort(a.begin(),vec.end());
  reverse(a.begin,vec.end());
  
  int Alice = 0;
  int 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:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<int> a;
      |   ^~~~~~
a.cc:6:10: error: expected primary-expression before 'int'
    6 |   vector<int> a;
      |          ^~~
a.cc:7:3: error: 'cin' was not declared in this scope
    7 |   cin >> n;
      |   ^~~
a.cc:9:22: error: 'a' was not declared in this scope
    9 |   for(int i = 0; i < a.size(); i++) cin >> a.at(i);
      |                      ^
a.cc:11:8: error: 'a' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |        ^
a.cc:11:18: error: 'vec' was not declared in this scope
   11 |   sort(a.begin(),vec.end());
      |                  ^~~
a.cc:11:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |   sort(a.begin(),vec.end());
      |   ^~~~
      |   short
a.cc:12:3: error: 'reverse' was not declared in this scope
   12 |   reverse(a.begin,vec.end());
      |   ^~~~~~~
a.cc:23:3: error: 'cout' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |   ^~~~
a.cc:23:26: error: 'endl' was not declared in this scope
   23 |   cout << Alice - Bob << endl;
      |                          ^~~~
Language: C

#include<stdio.h>

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

Compiler output:
main.c: In function 'main':
main.c:22:3: error: expected declaration or statement at end of input
   22 |   return 0;
      |   ^~~~~~
Language: C

#include<stdio.h>

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

Compiler output:
main.c: In function 'main':
main.c:10:18: error: expected ')' before ';' token
   10 |   for(int i=0;i(n;i++){
      |                ~ ^
      |                  )
main.c:10:15: error: called object 'i' is not a function or function pointer
   10 |   for(int i=0;i(n;i++){
      |               ^
main.c:10:11: note: declared here
   10 |   for(int i=0;i(n;i++){
      |           ^
main.c:10:23: error: expected ';' before '{' token
   10 |   for(int i=0;i(n;i++){
      |                       ^
      |                       ;
main.c:22:3: error: expected expression before 'return'
   22 |   return 0;
      |   ^~~~~~
main.c:23:1: error: expected expression before '}' token
   23 | }
      | ^
Language: C++

#include <iostream>

using namespace std;

int main(void) {
  int N;
  cin >> N;
  int a[N];
  for(int i=0; i < N; ++i){
    cin >> a[i];
  }
  sort(a, a+N);
  reverse(a, a+N);
  int al, bo = 0;
  for(int i=0; i < N; ++i){
    if(i % 2 ==0) {
      al += a[i];
    } else {
      bo += a[i];
    }
  }
  cout << al-bo << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |   sort(a, a+N);
      |   ^~~~
      |   short
a.cc:13:3: error: 'reverse' was not declared in this scope
   13 |   reverse(a, a+N);
      |   ^~~~~~~
Language: C++

#include <iostream>
using namespace std;

int main(){
//     input
    int N;
    int a[110];
    cin >> N;

    for (int i = 0; i < N; ++i) cin >> a[i];

    sort(a, a + N, greater<>());;

    int Alice = 0;
    int Bob = 0;

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

    cout << Alice - Bob << endl;

}

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

#include <iostream>
using namespace std;

int main(){
//     input
    int N;
    int a[110];
    cin >> N;

    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 += a[i];
        }
        else {
            Bob += a[i];
        }
    }
    
    cout << Alice - Bob << endl;

}

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

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

int main(){
  int n;
  cin >> n;
  int a[100];
  int ans=0;
  for(int i=0;i<n;i++){
    cin >> a[i];
  }
  
  for(int i=0;i<n;i++){
    for(int j=0;j<n;j++){
      if(a[j+1]<a[j]){
        int s=a[j];
        a[j]=a[j+1];
        a[j+1]=s;
      }
    }
  }
  
  
  if(n%2==0){
    int alice=0;
    int bob=0;
    for (int i=0;i<n;i++){
      if(i%2==0) alice+=a[i];
      else bob+=a[i];
    }
  }
  
  else{
    int alice=0;
    int bob=0;
    for (int i=0;i<n;i++){
      if(i%2==1) alice+=a[i];
      else bob+=a[i];
    }
  }
  
  cout << alice-bob << endl;
}
    
    
    
    
    
  

Compiler output:
a.cc: In function 'int main()':
a.cc:42:11: error: 'alice' was not declared in this scope
   42 |   cout << alice-bob << endl;
      |           ^~~~~
a.cc:42:17: error: 'bob' was not declared in this scope
   42 |   cout << alice-bob << endl;
      |                 ^~~
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++) {
		int j;
		cin >> j;
		vec.push_back(j);
	}
	
	sort(vec.begin(), vec.end());
	reverce(vec.begin(), vec.end());
	
	int A, B = 0;
	
	for(int i = 0; i < N; i + 2) {
		A = A + vec.at(i);
		B = B + vec.at(i + 1);
	}
	
	cout << A - B << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: 'reverce' was not declared in this scope
   16 |         reverce(vec.begin(), vec.end());
      |         ^~~~~~~
Language: C++

include  <iostream>
using namespace std;

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

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include  <iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin>>N;
      |   ^~~
a.cc:7:3: error: 'vector' was not declared in this scope
    7 |   vector<int>vec(N);
      |   ^~~~~~
a.cc:7:10: error: expected primary-expression before 'int'
    7 |   vector<int>vec(N);
      |          ^~~
a.cc:9:10: error: 'vec' was not declared in this scope
    9 |     cin>>vec.at(i);
      |          ^~~
a.cc:11:3: error: 'vec' was not declared in this scope
   11 |   vec=sort(vec.begin,vec.end)
      |   ^~~
a.cc:11:7: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |   vec=sort(vec.begin,vec.end)
      |       ^~~~
      |       short
a.cc:16:7: error: 'a' was not declared in this scope
   16 |       a+=vec.at(i);
      |       ^
a.cc:21:6: error: 'a' was not declared in this scope
   21 |   if(a-b<0){
      |      ^
a.cc:22:5: error: 'cout' was not declared in this scope
   22 |     cout<<b-a<<endl;
      |     ^~~~
a.cc:22:16: error: 'endl' was not declared in this scope
   22 |     cout<<b-a<<endl;
      |                ^~~~
a.cc:24:5: error: 'cout' was not declared in this scope
   24 |     cout<<a-b<<endl;
      |     ^~~~
a.cc:24:16: error: 'endl' was not declared in this scope
   24 |     cout<<a-b<<endl;
      |                ^~~~
Language: C++

#include <iostream>
using namespace std;

void sort(int& array,int N){
  	int temp = 0;
  
  	for(int i = 0; i < N; i++){
      for(int j = i + 1; j < N - 1; j++){ 
        if(array[i] < array[j]){
          temp = array[i];
          array[i] = array[j];
          array[j] = temp;
        }
      }
    }  
}


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


Compiler output:
a.cc: In function 'void sort(int&, int)':
a.cc:9:17: error: invalid types 'int[int]' for array subscript
    9 |         if(array[i] < array[j]){
      |                 ^
a.cc:9:28: error: invalid types 'int[int]' for array subscript
    9 |         if(array[i] < array[j]){
      |                            ^
a.cc:10:23: error: invalid types 'int[int]' for array subscript
   10 |           temp = array[i];
      |                       ^
a.cc:11:16: error: invalid types 'int[int]' for array subscript
   11 |           array[i] = array[j];
      |                ^
a.cc:11:27: error: invalid types 'int[int]' for array subscript
   11 |           array[i] = array[j];
      |                           ^
a.cc:12:16: error: invalid types 'int[int]' for array subscript
   12 |           array[j] = temp;
      |                ^
a.cc: In function 'int main()':
a.cc:33:8: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   33 |   sort(array,N);
      |        ^~~~~
      |        |
      |        int*
a.cc:4:16: note:   initializing argument 1 of 'void sort(int&, int)'
    4 | void sort(int& array,int N){
      |           ~~~~~^~~~~
a.cc:33:8: error: cannot bind rvalue '(int)((int*)(& array))' to 'int&'
   33 |   sort(array,N);
      |        ^~~~~
Language: C++

#include <iostream>
using namespace std;

void sort(int array[]){
  	int temp = 0;
  
  	for(int i = 0; i < array.size(); i++){
      for(int j = i + 1; j < array.size() - 1; j++){ 
        if(array[i] < array[j]){
          temp = array[i];
          array[i] = array[j];
          array[j] = temp;
        }
      }
    }  
}


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


Compiler output:
a.cc: In function 'void sort(int*)':
a.cc:7:34: error: request for member 'size' in 'array', which is of non-class type 'int*'
    7 |         for(int i = 0; i < array.size(); i++){
      |                                  ^~~~
a.cc:8:36: error: request for member 'size' in 'array', which is of non-class type 'int*'
    8 |       for(int j = i + 1; j < array.size() - 1; j++){
      |                                    ^~~~
Language: C++

#include <iostream>
using namespace std;

void sort(int *array,int N){
  	int temp = 0;
  
  	for(int i = 0; i < N - 1; i++){
      for(int j = i + 1; j < N; j++){ 
        if(array[i] < array[j]){
          temp = array[i];
          array[i] = array[j];
          array[j] = temp;
        }
      }
    }  
}


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


Compiler output:
a.cc: In function 'int main()':
a.cc:33:8: error: cannot convert 'int (*)[N]' to 'int*'
   33 |   sort(&array,N);
      |        ^~~~~~
      |        |
      |        int (*)[N]
a.cc:4:16: note:   initializing argument 1 of 'void sort(int*, int)'
    4 | void sort(int *array,int N){
      |           ~~~~~^~~~~
Language: C++

#include <iostream>
using namespace std;

void sort(int *array){
  	int temp = 0;
  
  	for(int i = 0; i < array.size() - 1; i++){
      for(int j = i + 1; j < array.size(); j++){ 
        if(array[i] < array[j]){
          temp = array[i];
          array[i] = array[j];
          array[j] = temp;
        }
      }
    }  
}


int main(void){
 
  int N;
  int Alice = 0;
  int Bob = 0;
  
  cin >> N;
  
  int array[N];
  
  for(int i = 0; i < N; i++){
    cin >> array[N];
  }
  
  sort(&array);
  
  for(int i = 0; i < N; i++){
  	if(i % 2 == 0){
    	Alice += array[i];
    }
    else{
      Bob += array[i];
    }
  }
  
  cout << (Alice - Bob) << endl;
  
  
  return 0;
}

Compiler output:
a.cc: In function 'void sort(int*)':
a.cc:7:34: error: request for member 'size' in 'array', which is of non-class type 'int*'
    7 |         for(int i = 0; i < array.size() - 1; i++){
      |                                  ^~~~
a.cc:8:36: error: request for member 'size' in 'array', which is of non-class type 'int*'
    8 |       for(int j = i + 1; j < array.size(); j++){
      |                                    ^~~~
a.cc: In function 'int main()':
a.cc:33:8: error: cannot convert 'int (*)[N]' to 'int*'
   33 |   sort(&array);
      |        ^~~~~~
      |        |
      |        int (*)[N]
a.cc:4:16: note:   initializing argument 1 of 'void sort(int*)'
    4 | void sort(int *array){
      |           ~~~~~^~~~~
Language: C++

  1 #include<bits/stdc++.h>     
  2 
  3 using namespace std;        
  4 
  5 int main(void){
  6         int n,i;
  7         cin >> n; 
  8         vector<int> a(n);   
  9         for (i=0;i<n;i++){  
 10                 cin >> a[i];
 11         }   
 12         sort(a.begin(),a.end(),greater<int>()); 
 13 
 14 //      for(i=0;i<n;i++){
 15 //              cout << a[i] << endl;
 16 //      }
 17         
 18         int sum_alice=0,sum_bob=0;
 19         for(i=0;i<n;i++)
 20         {       
 21                 if(i%2==0){
 22                         sum_alice+=a[i];
 23                 }else{  
 24                         sum_bob+=a[i];
 25                 }
 26         }
 27 //      cout << "alice=" << sum_alice << "\n" << "bob=" << sum_bob << endl;
 28         int ans = sum_alice - sum_bob;
 29         cout << ans << endl; 
 30 //      cout << "alice-bob=" << sum_alice - sum_bob << endl ;
 31         
 32         return 0;
 33 }
 34 


Compiler output:
a.cc:1:5: error: stray '#' in program
    1 |   1 #include<bits/stdc++.h>
      |     ^
a.cc:1:3: error: expected unqualified-id before numeric constant
    1 |   1 #include<bits/stdc++.h>
      |   ^
a.cc:4:3: error: expected unqualified-id before numeric constant
    4 |   4
      |   ^
a.cc:34:2: error: expected unqualified-id before numeric constant
   34 |  34
      |  ^~
Language: C++

#include <iostream>
#include <algorithm>
using namespace std;
int main(){
    int M;
    int a[110];
    cin >> N;
    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 += a[i];
        }else{
            Bob += a[i];
        }
    }
    cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: 'N' was not declared in this scope
    7 |     cin >> N;
      |            ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: lvalue required as left operand of assignment
   14 |     if(N%2 = 0){
      |        ~^~
a.cc:15:11: error: lvalue required as left operand of assignment
   15 |       if(i%2 = 0){
      |          ~^~
a.cc:21:11: error: lvalue required as left operand of assignment
   21 |       if(i%2 = 1){
      |          ~^~
Language: C++

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

int main(){
  int N;
  int alice = 0;
  int bob = 0;
  cin >> N;
  vector<int> a(N);
  for(int i = 0; i < N; i++;){
    cin >> a[i];
  }
  for(int i = 0; i < N; i++;){
    int max = 0;
    for(int j = i; j < N; j++){
      if(max <= a[j]){
        max = a[j];
      }
    }
    a[i] = max;
  }
  if(N%2 == 0){
    for(int i = 0; i < N; i += 2){
      alice += a[i];
      bob +=a[i+1];
    }
    cout << alice - bob << endl;
  }
  else if(N%2 == 1){
    for(int i = 0; i < N-1; i += 2){
      alice += a[i];
      bob +=a[i+1];
    }
    alice += a[N-1];
    cout << alice - bob << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:28: error: expected ')' before ';' token
   10 |   for(int i = 0; i < N; i++;){
      |      ~                     ^
      |                            )
a.cc:10:29: error: expected primary-expression before ')' token
   10 |   for(int i = 0; i < N; i++;){
      |                             ^
a.cc:13:28: error: expected ')' before ';' token
   13 |   for(int i = 0; i < N; i++;){
      |      ~                     ^
      |                            )
a.cc:13:29: error: expected primary-expression before ')' token
   13 |   for(int i = 0; i < N; 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 sum = 0;
  for (int i = 0; i < N; i++) {
    if (i%2 == 0) {
      sum += vec.at(i)
    }
    else {
      sum -= vec.at(i)
    }
    
  }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:23: error: expected ';' before '}' token
   18 |       sum += vec.at(i)
      |                       ^
      |                       ;
   19 |     }
      |     ~                  
a.cc:21:23: error: expected ';' before '}' token
   21 |       sum -= vec.at(i)
      |                       ^
      |                       ;
   22 |     }
      |     ~
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 sum = 0;
  for (int i = 0; i < N; i++) {
    if (i%2 == 0) {
      sum += vec.at(i)
    }
    else {
      sum -= vec.at(i)
    }
    
  }
  
}


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:18:7: error: 'sum' was not declared in this scope
   18 |       sum += vec.at(i)
      |       ^~~
a.cc:21:7: error: 'sum' was not declared in this scope
   21 |       sum -= vec.at(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 sum = 0;
  for (int i = 0; i < N, i++) {
    if (i%2 == 0) {
      sum += vec.at(i)
    }
    else {
      sum -= vec.at(i)
    }
    
  }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:29: error: expected ';' before ')' token
    9 |   for (int i = 0; i < N, i++) {
      |                             ^
      |                             ;
a.cc:12:30: error: expected ';' before 'reverse'
   12 |   sort(vec.begin(),vec.end())
      |                              ^
      |                              ;
   13 |   reverse(vec.begin(),vec.end())
      |   ~~~~~~~                     
a.cc:16:29: error: expected ';' before ')' token
   16 |   for (int i = 0; i < N, i++) {
      |                             ^
      |                             ;
a.cc:18:7: error: 'sum' was not declared in this scope
   18 |       sum += vec.at(i)
      |       ^~~
a.cc:21:7: error: 'sum' was not declared in this scope
   21 |       sum -= vec.at(i)
      |       ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int N,a[110];
  cin >> N;
  vector<int>vec=a[110];
  for(int i=1;i<=N;i++){
    cin >> vec.at(i);
  }
  sort(vec.begin(),vec.end());
  reverse(vec.begin(),vec.end());
  int Alice=0,Bob=0;
  for(int i=1;i<=N;i++){
    if(i%2==1){
      Alice+=vec.at(i);
    }
    if(i%2==0){
      Bob+=vec.at(i);
    }
  }
  cout << Alice-Bob << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:23: error: conversion from 'int' to non-scalar type 'std::vector<int>' requested
    6 |   vector<int>vec=a[110];
      |                  ~~~~~^
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:4:11: error: 'i' was not declared in this scope
    4 |   int N,a(i);
      |           ^
a.cc:15:15: error: 'a' cannot be used as a function
   15 |       Alice+=a(i);
      |              ~^~~
a.cc:18:13: error: 'a' cannot be used as a function
   18 |       Bob+=a(i);
      |            ~^~~
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:15:15: error: 'a' cannot be used as a function
   15 |       Alice+=a(i);
      |              ~^~~
a.cc:18:13: error: 'a' cannot be used as a function
   18 |       Bob+=a(i);
      |            ~^~~
Language: C++

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

int main() {
  int n,a = 0;b = 0;
  cin >> n;
  vector<int>data(n);
  for(int i = 0;i < n;i++){
    cin >> data.at(i);
  }
  sort(data.begin(),data.end());
  reverse(data.begin(),data.end());
  for(int i = 0;i < n;i += 2){
    a += data.at(i);
  }
  for(int i = 1;i < n;i += 2){
    b += data.at(i);
  }
  cout << a-b << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:15: error: 'b' was not declared in this scope
    5 |   int n,a = 0;b = 0;
      |               ^
Language: C++

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

// ABC 088 B
int main() {
  int N;
  int a[100];
  cin >> N;
  for (int i = 0; i < N; i++) cin >> a[i];

  sort(a, a + M, greater<int>());
  int Alice = 0, Bob = 0;
  for (int i = 0; i < N; i++){
    if (i % 2 == 0) Alice += a[i];
    else Bob += a[i];
  }

  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:15: error: 'M' was not declared in this scope
   12 |   sort(a, a + M, greater<int>());
      |               ^
Language: C++

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

// ABC 088 B
int main() {
  int N;
  int a[100];
  cin >> N;
  for (int i = 0; i < N; i++) cin >> a[i];

  sort(a, a + M, greater<int>());
  int Alice = 0, Bob = 0;
  for (int i = 0; i < N; i++){
    if (i % 0 == 0) Alice += a[i];
    else Bob += a[i];
  }

  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:15: error: 'M' was not declared in this scope
   12 |   sort(a, a + M, greater<int>());
      |               ^
a.cc:15:11: warning: division by zero [-Wdiv-by-zero]
   15 |     if (i % 0 == 0) Alice += a[i];
      |         ~~^~~
Language: C++

#include <iostream>
#define rep(i, n) for (int i = 0; i < n; i++)
using namespace std;

int main() {
    int n;
    int a[100] = {0};
    int A = 0, B = 0;
    cin >> n;
    rep(i, n) {
        cin >> a[i];
    }
    sort(a, a + 100, greater<>());
    rep(i, n) {
        if (i % 2 == 0) {
            A += a[i];
        } else {
            B += a[i];
        }
    }
    cout << A - B << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |     sort(a, a + 100, greater<>());
      |     ^~~~
      |     short
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N = 0;
  cin >> N;
  int[114514] cards;
  
  for(int i=0;i<N;i++) {
    cin << cards[i];
  }

  int point_A = 0;
  int point_B = 0;
  	
  for(int i=0;i<N;i++) {
    if(i%0==0) point_A += cards[i];
    else       point_B += cards[i];
  }
  
  cout<<point_A - point_B;
  
  return 0;
  
}
      
 



Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: expected identifier before numeric constant
    7 |   int[114514] cards;
      |       ^~~~~~
a.cc:7:7: error: expected ']' before numeric constant
    7 |   int[114514] cards;
      |       ^~~~~~
      |       ]
a.cc:7:6: error: structured binding declaration cannot have type 'int'
    7 |   int[114514] cards;
      |      ^
a.cc:7:6: note: type must be cv-qualified 'auto' or reference to cv-qualified 'auto'
a.cc:7:6: error: empty structured binding declaration
a.cc:7:15: error: expected initializer before 'cards'
    7 |   int[114514] cards;
      |               ^~~~~
a.cc:10:12: error: 'cards' was not declared in this scope
   10 |     cin << cards[i];
      |            ^~~~~
a.cc:17:9: warning: division by zero [-Wdiv-by-zero]
   17 |     if(i%0==0) point_A += cards[i];
      |        ~^~
a.cc:17:27: error: 'cards' was not declared in this scope
   17 |     if(i%0==0) point_A += cards[i];
      |                           ^~~~~
a.cc:18:27: error: 'cards' was not declared in this scope
   18 |     else       point_B += cards[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());
  reverse(a.begin(),a.end());
  a.push_back(0)
  int x = 0;
  
  for (int i = 0; i < N; i + 2) {
    x += a.at(i) - a.at(i + 1);
  }
  
  cout << x << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: expected ';' before 'int'
   16 |   a.push_back(0)
      |                 ^
      |                 ;
   17 |   int x = 0;
      |   ~~~            
a.cc:20:5: error: 'x' was not declared in this scope
   20 |     x += a.at(i) - a.at(i + 1);
      |     ^
a.cc:23:11: error: 'x' was not declared in this scope
   23 |   cout << x << endl;
      |           ^
Language: Java

import java.util.*;
public class Main{
	public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        Integer a[] = new int[n];
        for(int i=0; i<n; i++){
            a[i] = sc.nextInt();
        }
        Arrays.sort(a, Comparator.reverseOrder());

        int alice = 0;
        int bob = 0;
        for(int i=0; i<n; i+=2){
            alice = alice + a[i];
        }
        for(int i=1; i<n; i+=2){
            bob = bob + a[i];
        }
        System.out.println(alice - bob);
    }
}


Compiler output:
Main.java:6: error: incompatible types: int[] cannot be converted to Integer[]
        Integer a[] = new int[n];
                      ^
1 error
Language: C++

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

int main() {
  int n;
  cin >> n;
  vector<int> v(n);
  
  for(int i =0 ; i <n ; i++) {
    cin >> v.at(i);
  }
  sort(v.begin(), v.end());
  reverse(v.begin(), v.end());
  
  int s =0;
  for(int i =0 , i<n ; i +=2){
    s += v.at(i);
  }
  cout << s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:19: error: expected ';' before '<' token
   16 |   for(int i =0 , i<n ; i +=2){
      |                   ^
      |                   ;
a.cc:16:19: error: expected primary-expression before '<' token