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

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

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

int main() {
    int n;cin>>n;
    int a[n];
    rep(i,n)cin>>a[i];
    sort(a,a+n,greater<int>());
    
    int a1=0,b1=0;
    
    rep(i,n){
        if(i%2==0)a1+=a[i];
        else b1+=b[i];
    }
    cout<<a1-b1<<endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:18: error: 'b' was not declared in this scope
   16 |         else b1+=b[i];
      |                  ^
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; n++) {
  	cin >> cards.at(i)
  }
  
  sort(cards.begin(), cards.end());
  reverse(cards.begin(), cards.end());
  int Alice, Bob;
  
  for (int i = 0; i < n; i += 2) {
  	Alice += cards[i];
    Bob += cards[i + 1];
  }
  if (Alice >= Bob) {
  	cout << Alice - Bob << endl;
  }else {
  	cout << Bob - Alice << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:27: error: expected ';' before '}' token
   10 |         cin >> cards.at(i)
      |                           ^
      |                           ;
   11 |   }
      |   ~
Language: C++

#include<bits/stdc++.h>
int main(){
  std::vector <int>a(100);
  int N,Alice,Bob;
  std::cin>>N;
  Alice=Bob=0;
  for(int i=0;i<N;i++){
    std::cin>>a[i];
  }
  std::sort(a.begin(),a.end());
  std::reverse(a.begin(), a.end());
  for(int i=0;i<N;i++){
    if(i%2==0){
      Alice+=a[i];
    }else{
      Bob+=a[i];
    }
    std::cout<<Alice-Bob<<std::endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
a.cc:2:11: note: to match this '{'
    2 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
int main(){
  std::vector <int>a<100>;
  int N,Alice,Bob;
  std::cin>>N;
  Alice=Bob=0;
  for(int i=0;i<N;i++){
    std::cin>>a[i];
  }
  std::sort(a.begin(),a.end());
  std::reverse(a.begin(), a.end());
  for(int i=0;i<N;i++){
    if(i%2==0){
      Alice+=a[i];
    }else{
      Bob+=a[i];
    }
    std::cout<<Alice-Bob<<std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:21: error: expected initializer before '<' token
    3 |   std::vector <int>a<100>;
      |                     ^
a.cc:8:15: error: 'a' was not declared in this scope
    8 |     std::cin>>a[i];
      |               ^
a.cc:10:13: error: 'a' was not declared in this scope
   10 |   std::sort(a.begin(),a.end());
      |             ^
a.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
a.cc:2:11: note: to match this '{'
    2 | int main(){
      |           ^
Language: C++

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

int main() {
  int N, x;
  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());
  
  for(int i=0;i<N;i++) {
    if(i%2=0) {
      x += a.at(i);
    }
    else {
      x-= a.at(i);
    }
  }
  cout << x << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:9: error: lvalue required as left operand of assignment
   17 |     if(i%2=0) {
      |        ~^~
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 Alice = 0;
  int Bob = 0;
  
  for (int = 0; i < n; i++) {
    if (i % 2 == 0)
      Alice++;
    else
      Bob++;
  }
  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:12: error: expected unqualified-id before '=' token
   19 |   for (int = 0; i < n; i++) {
      |            ^
a.cc:19:11: error: expected ';' before '=' token
   19 |   for (int = 0; i < n; i++) {
      |           ^~
      |           ;
a.cc:19:12: error: expected primary-expression before '=' token
   19 |   for (int = 0; i < n; i++) {
      |            ^
a.cc:19:17: error: 'i' was not declared in this scope
   19 |   for (int = 0; i < n; i++) {
      |                 ^
a.cc:19:22: error: expected ')' before ';' token
   19 |   for (int = 0; i < n; i++) {
      |       ~              ^
      |                      )
a.cc:19:24: error: 'i' was not declared in this scope
   19 |   for (int = 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());
  reverse(a.begin(), a.end());
  
  int Alice = 0;
  int Bob = 0;
  
  for (i = 0; i < n; i++) {
    if (i % 2 == 0)
      Alice++;
    else
      Bob++;
  }
  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:8: error: 'i' was not declared in this scope
   19 |   for (i = 0; i < n; i++) {
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    vector<int> vec = {N};
    
  	cin >> Alice;
  	cin >> Bob;
  
    for (int i = 0; i < vec.size(); i++) {
        cout << vec.at(i) << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:24: error: 'N' was not declared in this scope
    5 |     vector<int> vec = {N};
      |                        ^
a.cc:5:25: error: could not convert '{<expression error>}' from '<brace-enclosed initializer list>' to 'std::vector<int>'
    5 |     vector<int> vec = {N};
      |                         ^
      |                         |
      |                         <brace-enclosed initializer list>
a.cc:7:16: error: 'Alice' was not declared in this scope
    7 |         cin >> Alice;
      |                ^~~~~
a.cc:8:16: error: 'Bob' was not declared in this scope
    8 |         cin >> Bob;
      |                ^~~
Language: C++

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

int main(){
  int n,at=0,bt=0,a[102];
  cin>>n;
  for(int i=0;i<n;i++){
    cin>>a[i];
  }
  sort(a,a+n);
  for(int i=n-1;i>=0;i-=2){
    at+=a[i];
  }
  for(int i=n-2;i>=0;i-=2){
    bt+=b[i];
  }
  cout<<at-bt<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'b' was not declared in this scope
   15 |     bt+=b[i];
      |         ^
Language: C++

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

int main(){
  int n,at=0,bt=0;
  cin>>n;
  vector<int>a(n);
  for(int i=0;i<n;i++){
    cin>>a[i];
  }
  sort(a,a+n());
  for(int i=n-1;i>=0;i-=2){
    at+=a[i];
  }
  for(int i=n-2;i>=0;i-=2){
    bt+=b[i];
  }
  cout<<at-bt<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'n' cannot be used as a function
   11 |   sort(a,a+n());
      |            ~^~
a.cc:16:9: error: 'b' was not declared in this scope
   16 |     bt+=b[i];
      |         ^
Language: C++

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

int main(){
  int N;
  int a[100];
  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:15:12: error: expected ';' before '-' token
   15 |   for(int i-0; i<N;++i){
      |            ^
      |            ;
a.cc:15:19: error: expected ')' before ';' token
   15 |   for(int i-0; i<N;++i){
      |      ~            ^
      |                   )
a.cc:15:22: error: 'i' was not declared in this scope
   15 |   for(int i-0; i<N;++i){
      |                      ^
Language: C++

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

int main(){
  int N;
  int a[100];
  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:10:16: error: expected ';' before '}' token
   10 |     cin >> a[i]
      |                ^
      |                ;
   11 |   }
      |   ~             
a.cc:15:12: error: expected ';' before '-' token
   15 |   for(int i-0; i<N;++i){
      |            ^
      |            ;
a.cc:15:19: error: expected ')' before ';' token
   15 |   for(int i-0; i<N;++i){
      |      ~            ^
      |                   )
a.cc:15:22: error: 'i' was not declared in this scope
   15 |   for(int i-0; i<N;++i){
      |                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
 vector<int> P(N);
  for(int i=0;i<N;i++){
    cin >>P.at(i);}

  sort(P.begin(), P.end());
  reverse(P.begin(), P.end());
  int sumA=0;
  for(int i=0;i%2==0 && i<N;i+=2){
  sumA +=P.at(i);
  
  }
int sumB=0;
   for(int i=1;i%2==1 && i<N;i+=2){
  sumB +=P.at(i);
  
  }
  cout << sumA-sumB <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:16: error: 'N' was not declared in this scope
    5 |  vector<int> P(N);
      |                ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
 vector<int> P(N);
  for(int i=0;i<N;i++){
    cin >>P.at(i);}

  sort(vec.begin(), vec.end());
  reverse(vec.begin(), vec.end());
  int sumA=0;
  for(int i=0;i%2=0 && i<N;i+=2){
  sumA +=P.at(i);
  
  }
int sumB=0;
   for(int i=1;i%2=1 && i<N;i+=2){
  sumB +=P.at(i);
  
  }
  cout << sumA-sumB <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:16: error: 'N' was not declared in this scope
    5 |  vector<int> P(N);
      |                ^
a.cc:9:8: error: 'vec' was not declared in this scope
    9 |   sort(vec.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<N;i++)
    cin >> vec.at(i);
  sort(vec.begin(),vec.end());
  int j=0;
  for(int i=0;i<N;i++){
    if(i%2==0)
      j+=A.at(i);
    else
      j-=A.at(i);
  }
  cout << j << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: 'vec' was not declared in this scope
    9 |     cin >> vec.at(i);
      |            ^~~
a.cc:10:8: error: 'vec' was not declared in this scope
   10 |   sort(vec.begin(),vec.end());
      |        ^~~
Language: C++

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

void solve(long long N, std::vector<long long> a){
    sort(a.begin(), a.end(), greater<long long>());

    long long sumA = 0;
    long long sumB = 0;
    REP(i, a.size()) {
        if (i % 2) sumB += a[i];
        else sumA += a[i];
    }

    cout << sumA - sumB << '\n';
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);
    long long N;
    scanf("%lld",&N);
    std::vector<long long> a(N);
    for(int i = 0 ; i < N ; i++){
        scanf("%lld",&a[i]);
    }
    solve(N, std::move(a));
    return 0;
}


Compiler output:
a.cc: In function 'void solve(long long int, std::vector<long long int>)':
a.cc:7:5: error: 'sort' was not declared in this scope; did you mean 'short'?
    7 |     sort(a.begin(), a.end(), greater<long long>());
      |     ^~~~
      |     short
Language: C++

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

int main(){
  int n;
  cin>>n;
  vector<int> card;
  int alice=0,bob=0;
  for(int i=0;i<n;i++){
    cin>>card[i];
  }
  sort(card.begin(),card.end(),grreater<int>());
  for(int i=0;i<n;i++){
    if((i+1)%2==1){
      alice+=card[i];
    }else{
      bob+=card[i];
    }
  }
  cout<<alice-bob<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:32: error: 'grreater' was not declared in this scope
   12 |   sort(card.begin(),card.end(),grreater<int>());
      |                                ^~~~~~~~
a.cc:12:41: error: expected primary-expression before 'int'
   12 |   sort(card.begin(),card.end(),grreater<int>());
      |                                         ^~~
Language: C++

int main() {
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:4:1: error: 'cin' was not declared in this scope
    4 | cin>>N;
      | ^~~
a.cc:7:14: error: 'greater' was not declared in this scope
    7 |   sort(a,a+N,greater<int>());
      |              ^~~~~~~
a.cc:7:22: error: expected primary-expression before 'int'
    7 |   sort(a,a+N,greater<int>());
      |                      ^~~
a.cc:7:3: error: 'sort' was not declared in this scope; did you mean 'short'?
    7 |   sort(a,a+N,greater<int>());
      |   ^~~~
      |   short
a.cc:14:1: error: 'cout' was not declared in this scope
   14 | cout<<Alice-Bob<<endl;
      | ^~~~
a.cc:14:18: error: 'endl' was not declared in this scope
   14 | cout<<Alice-Bob<<endl;
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> data(N);
  
  for(int i=0; i<N; i++) cin >> data.at(i);
  
  int A=0,B=0, max, count=1;
  
  while(count!=N){
    max=0;
    int temp=0;
    for(int i=0;i<N;i++){
      if(max<data.at(i)){
        max=data.at(i);
        temp = i;
    }
    if(count%2==1) A += max;
    else 
      B += max;
    data.at(temp)=0;
    count++;
  }
  
  cout << A-B << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:28:2: error: expected '}' at end of input
   28 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;
  cin >> N;
  vector<int> data(N);
  
  for(int i=0; i<N; i++) cin >> data.at(i);
  
  int A=0,B=0, max, count=1;
  
  while(count!=N){
    max=0;
    int temp=0;
    for(int i=0;i<N;i++){
      if(max<data.at(i)){
        max=data.at(i);
        temp = i;
    }
    if(count%2==1) A += max;
    else B += max;
    data.at(temp)=0;
    count++;
  }
  
  cout << A-B << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:2: error: expected '}' at end of input
   27 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:17:3: error: 'reserve' was not declared in this scope
   17 |   reserve(A.begin(), A.end());
      |   ^~~~~~~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:13:11: error: expected unqualified-id before '=' token
   13 |   for(int = 0; i < n; i++)
      |           ^
a.cc:13:10: error: expected ';' before '=' token
   13 |   for(int = 0; i < n; i++)
      |          ^~
      |          ;
a.cc:13:11: error: expected primary-expression before '=' token
   13 |   for(int = 0; i < n; i++)
      |           ^
a.cc:13:16: error: 'i' was not declared in this scope
   13 |   for(int = 0; i < n; i++)
      |                ^
a.cc:13:21: error: expected ')' before ';' token
   13 |   for(int = 0; i < n; i++)
      |      ~              ^
      |                     )
a.cc:13:23: error: 'i' was not declared in this scope
   13 |   for(int = 0; i < n; i++)
      |                       ^
Language: C

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

int main(){
    int n,ans_a=0,ans_b=0;
  	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());
    for(int i=0; i<n; i++){
        if(i%2==0) ans_a += int(a[i]);
        else ans_b += int(a[i]);
    }
    cout << ans_a-ans_b << endl;
}

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

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

int main(){
    int n,ans_a=0,ans_b=0;
  	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());
    for(int i=0; i<n; i++){
        if(i%2==0) ans_a += int(a[i]);
        else ans_b += int(a[i]);
    }
    cout << ans_a-ans_b << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
a.cc:14:9: error: 'reverse' was not declared in this scope
   14 |         reverse(a.begin(),a.end());
      |         ^~~~~~~
Language: C++

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

int main(){
    int n,ans_a=0,ans_b=
    vector <int> a(n);
    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) ans_a += int(a[i]9;
        else ans_b +=int(a[i]);
    }
    cout << ans_a-ans_b << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:18: error: expected primary-expression before 'a'
    6 |     vector <int> a(n);
      |                  ^
a.cc:9:16: error: 'a' was not declared in this scope
    9 |         cin >> a.at(i);
      |                ^
a.cc:11:10: error: 'a' was not declared in this scope
   11 |     sort(a.begin(),a.end());
      |          ^
Language: C++

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

int main(){
  //全部でN枚
  int N;
  int alice;
  int bob;
  vector<int> all_num(N);
  
  for(int i=0;i<N;i++){
    cin >> all_num.at(i);
  }
  
  sort(all_num.begin(),all_num.end());
  reverse(all_num.begin(),all_num.end());
  
  for(int j=0;j<N; j++){
    if(j % 2 = 0){
      alice += all_num.at(j);
    }
    else if(j % 2 = 1){
      bob += all_num.at(j);
    }
  }
  
  cout << alice - bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:10: error: lvalue required as left operand of assignment
   19 |     if(j % 2 = 0){
      |        ~~^~~
a.cc:22:15: error: lvalue required as left operand of assignment
   22 |     else if(j % 2 = 1){
      |             ~~^~~
Language: C++

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

int main(){
  //全部でN枚
  int N;
  int alice;
  int bob;
  vector<int> all_num(N);
  
  for(int i=0;i<N;i++){
    cin >> all_num.at(i);
  }
  
  sort(all_num.begin(),all_num.end());
  
  for(int j=0;j<N; j++){
    if(j % 2 == 0){
      bob += all_num.at(j);
    }
    if(j % 2 == 1){
      alice += all_num.at(j);
    }
  }
  
  cout << alice - bob << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:26:31: error: expected '}' at end of input
   26 |   cout << alice - bob << endl;
      |                               ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

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

int main(){
  //全部でN枚
  int N;
  vector<int> all_num(N);
  
  for(int i=0;i<N;i++){
    cin >> all_num.at(i);
  }
  
  sort(all_num.begin(),all_num.end());
  
  int alice;
  int bob;
  
  for(int j=0;j<N; j++){
    if(j % 2 == 0){
      bob += all_num.at(j);
    }
    if(j % 2 == 1){
      alice += all_num.at(j);
    }
  }
  
  cout << alice - bob << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:27:31: error: expected '}' at end of input
   27 |   cout << alice - bob << endl;
      |                               ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <iostream> 
#include <vector>

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

int main() {
   int N;
   cin >> N;
   vector<int> a(N);
   for (int i = 0; i < N; i++) {
      cin >> a.at(i);
   }
   
   sort(a.rbegin(), a.rend());
   int total_a = 0;
   int total_b = 0;
   for (int i = 0; i < N; i++) {
      if (i % 2 == 0) {
         total_a += a.at(i);
      } else total_b += a.at(i);
   }

   cout << total_a - total_b << endl;
   
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:4: error: 'sort' was not declared in this scope; did you mean 'short'?
   15 |    sort(a.rbegin(), a.rend());
      |    ^~~~
      |    short
Language: C++

#include<iostream>
#include<vector>
#include<string>
#include<math.h>
#include<queue>
using namespace std;
#define rep(i, n) for (int i=0; i<(int) (n);i++)
using ll = long long;
using P = pair<int,int>;

void solve_8(){//7m
    string a, b;
    cin >> a >> b;
    string tmp =  a+b;
    int c = atoi(tmp.c_str());
    //cout << c << endl;
    int c_square = sqrt(c);
    cout << (c_square * c_square == c? "Yes": "No") << endl;
    
}

void solve_8re(){
    string a, b;
    cin >> a >> b;
    //stoi -> int
    //stol -> long
    //stof -> float
    int c = stoi(a+b);
    int c_square = sqrt(c);
    cout << (c_square * c_square == c? "Yes": "No")<< endl;
}

void solve_9(){//12m
    int n,k;
    cin >> n >> k;
    int sum_distance = 0;
    rep(i, n){
        int x;
        cin >> x;
        sum_distance += 2 * min(x, k-x);
    }
    cout << sum_distance;
}

void solve_10(){//7m
    int n;
    cin >> n;
    priority_queue<int> pq;
    int a;
    rep(i, n){
        cin >> a;
        pq.push(a);
    }
    int alice = 0, bob = 0;
    int turn = 0;
    while(!pq.empty()){
        a = pq.top();
        pq.pop();
        if (turn % 2 == 0){
            alice += a;
        }
        else{
            bob += a;
        }
        turn += 1;
    }
    cout << alice - bob;
    
}

void solve_10re(){
    int n;
    cin >> n;
    vector<int> a;
    int a_;
    rep(i, n){
        cin >> a_;
        a.push_back(a_);
    }
    sort(a.begin(), a.end(), greater<int>());
    int total = 0;
    rep(i, n){
        total += (i%2==0?a[i]:-a[i]);
    }
    cout << total;
}

void solve_D(){
    
}

void solve_E(){
    
}

void solve_F(){
    
}

int main(){
    //solve_8re();
    //solve_9();
    solve_10re();
    //solve_D();
    //solve_E();
    //solve_F();
    return 0;
}

Compiler output:
a.cc: In function 'void solve_10re()':
a.cc:80:5: error: 'sort' was not declared in this scope; did you mean 'sqrt'?
   80 |     sort(a.begin(), a.end(), greater<int>());
      |     ^~~~
      |     sqrt
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:8:26: error: expected ';' before 'reverse'
    8 |   sort(a.begin(),a.end())
      |                          ^
      |                          ;
    9 |   reverse(a.begin(),a.end())
      |   ~~~~~~~                 
a.cc:14:7: error: 'point' was not declared in this scope
   14 |       point+=a.at(i);
      |       ^~~~~
a.cc:17:7: error: 'point' was not declared in this scope
   17 |       point-=a.at(i);
      |       ^~~~~
a.cc:21:11: error: 'point' was not declared in this scope
   21 |   cout << point << endl;
      |           ^~~~~
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: 'std::vector<int>::iterator' has no member named 'a'
    8 |   sort(a.begin().a.end())
      |                  ^
a.cc:14:7: error: 'point' was not declared in this scope
   14 |       point+=a.at(i);
      |       ^~~~~
a.cc:17:7: error: 'point' was not declared in this scope
   17 |       point-=a.at(i);
      |       ^~~~~
a.cc:21:11: error: 'point' was not declared in this scope
   21 |   cout << point << endl;
      |           ^~~~~
Language: C++

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

int main() {
  int N;
  cin >> N;
  
  vector<int> X(N);
  
  int A=0;
  int B=0;
  #include <bits/stdc++.h>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   15 | int main() {
      |         ^~
a.cc:15:9: note: remove parentheses to default-initialize a variable
   15 | int main() {
      |         ^~
      |         --
a.cc:15:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:15:12: error: a function-definition is not allowed here before '{' token
   15 | int main() {
      |            ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: conflicting declaration 'std::vector<int> X'
    6 |    vector<int> X;
      |                ^
a.cc:5:9: note: previous declaration as 'int X'
    5 |   int N,X;
      |         ^
a.cc:12:10: error: request for member 'begin' in 'X', which is of non-class type 'int'
   12 |   sort(X.begin(),X.end());
      |          ^~~~~
a.cc:12:20: error: request for member 'end' in 'X', which is of non-class type 'int'
   12 |   sort(X.begin(),X.end());
      |                    ^~~
a.cc:13:15: error: request for member 'begin' in 'X', which is of non-class type 'int'
   13 |     reverse(X.begin(),X.end());
      |               ^~~~~
a.cc:13:25: error: request for member 'end' in 'X', which is of non-class type 'int'
   13 |     reverse(X.begin(),X.end());
      |                         ^~~
a.cc:17:10: error: request for member 'at' in 'X', which is of non-class type 'int'
   17 |     A+=X.at(0);
      |          ^~
a.cc:19:10: error: request for member 'at' in 'X', which is of non-class type 'int'
   19 |     B+=X.at(0);
      |          ^~
Language: C++

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N,A,B;
  cin >> N;
  A,B = 0
  vector<int> a(N);
  for (int i = 0; i < N; i++;){
    cin >> a[i];
  }
  sort(a.begin(),a.end());
  reverse(a.begin(),a.end());
  cout << A;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:10: error: expected ';' before 'vector'
    8 |   A,B = 0
      |          ^
      |          ;
    9 |   vector<int> a(N);
      |   ~~~~~~  
a.cc:10:29: error: expected ')' before ';' token
   10 |   for (int i = 0; i < N; i++;){
      |       ~                     ^
      |                             )
a.cc:10:30: error: expected primary-expression before ')' token
   10 |   for (int i = 0; i < N; i++;){
      |                              ^
a.cc:13:8: error: 'a' was not declared in this scope
   13 |   sort(a.begin(),a.end());
      |        ^
Language: C++

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
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 >> a[i]
  }
  sort(a.begin(),a.end());
  reverse(a.begin(),a.end());
  for (int i = 0; i < N; i++;){
    if(i%2 == 0) A += a[i];
    else B += a[i];
  }
  cout << A - B;
}

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:9:30: error: expected primary-expression before ')' token
    9 |   for (int i = 0; i < N; i++;){
      |                              ^
a.cc:14:29: error: expected ')' before ';' token
   14 |   for (int i = 0; i < N; i++;){
      |       ~                     ^
      |                             )
a.cc:14:30: error: expected primary-expression before ')' token
   14 |   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());
  reverse(a.begin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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.bigin(),a.end());
  reverse(a.bigin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(a.bigin(),a.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(a.bigin(),a.end());
      |             ^~~~~
      |             begin
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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.bigin(),a.end());
  reverse(a.bigin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(a.bigin(),a.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(a.bigin(),a.end());
      |             ^~~~~
      |             begin
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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(i);
    }
 
  sort(a.bigin(),a.end());
  reverse(a.bigin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: no match for call to '(std::vector<int>) (int&)'
   10 |       cin >> a(i);
      |              ~^~~
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(a.bigin(),a.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(a.bigin(),a.end());
      |             ^~~~~
      |             begin
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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(i);
    }
 
  sort(a.bigin(),a.end());
  reverse(a.bigin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: expected ';' before 'a'
   10 |       cin a(i);
      |          ^~
      |          ;
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(a.bigin(),a.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(a.bigin(),a.end());
      |             ^~~~~
      |             begin
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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(i);
    }

  sort(a.bigin(),a.end());
  reverse(a.bigin(),a.end());
  
  int A=0,B=0;
  
  for(int i=0;i<N;i++){
    if(1%2=0){
      A+=a(i);
    }
    else{
      B+=a(i);
    }
  }
  
  cout << A - B <<endl;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: expected ',' or ';' before 'for'
    9 |     for(int i=0; i<N; i++) {
      |     ^~~
a.cc:9:18: error: 'i' was not declared in this scope
    9 |     for(int i=0; i<N; i++) {
      |                  ^
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(a.bigin(),a.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(a.bigin(),a.end());
      |             ^~~~~
      |             begin
a.cc:19:9: error: lvalue required as left operand of assignment
   19 |     if(1%2=0){
      |        ~^~
a.cc:20:11: error: no match for call to '(std::vector<int>) (int&)'
   20 |       A+=a(i);
      |          ~^~~
a.cc:23:11: error: no match for call to '(std::vector<int>) (int&)'
   23 |       B+=a(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.bigin(),A.end());
  reverse(A.bigin(),A.end());
  
  for(int i=0, i<N; i+=1){
    int Alice;
    Alice += A.at(i);
  }
    
  for(int i=1; i<N; i+=1){
    int Bob; 
    Bob += A.at(i);
  }
  
  cout << Alice - Bob << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:10: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   13 |   sort(A.bigin(),A.end());
      |          ^~~~~
      |          begin
a.cc:14:13: error: 'class std::vector<int>' has no member named 'bigin'; did you mean 'begin'?
   14 |   reverse(A.bigin(),A.end());
      |             ^~~~~
      |             begin
a.cc:16:17: error: expected ';' before '<' token
   16 |   for(int i=0, i<N; i+=1){
      |                 ^
      |                 ;
a.cc:16:17: error: expected primary-expression before '<' token
a.cc:26:11: error: 'Alice' was not declared in this scope
   26 |   cout << Alice - Bob << endl;
      |           ^~~~~
a.cc:26:19: error: 'Bob' was not declared in this scope
   26 |   cout << Alice - Bob << endl;
      |                   ^~~
Language: C++

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

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

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

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

int main() {
    int N;
    cin >> N;
    
    std::vector<int> data(N);
    for (int i = 0; i > N; i++) {
        cin >> data.at(i);
    }
    
    for (int i= 0; i > N - 1; i++) {
        if (data.at(i) > data.at(i + 1)) swap(data.at(i), data.at(i+1);
    }
    
    int Alice = 0;
    int Bob = 0;
    for(int i= 0; i > N; i++) {
        if (i % 2 == 0) {
            Alice += data.at(i);
        } else {
            Bob += data.at(i);
        }
    }
    
    cout << Alice - Bob << endl;
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:71: error: expected ')' before ';' token
   14 |         if (data.at(i) > data.at(i + 1)) swap(data.at(i), data.at(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<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==1){
            alice+=a.at(i);
        }
        else{
            bob+=a.at(i);
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:31: error: expected ';' before 'int'
   12 |     reverse(a.begin(),a.end())
      |                               ^
      |                               ;
   13 |     int alice=0,bob=0;
      |     ~~~                        
a.cc:16:13: error: 'alice' was not declared in this scope
   16 |             alice+=a.at(i);
      |             ^~~~~
a.cc:19:13: error: 'bob' was not declared in this scope
   19 |             bob+=a.at(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);
    }
    int max=0;
    int alice=0;
    int bob=0;
    for(int i=0;i<N;i++){
        if(max<=a.at(i)){
            max=a.at(i);
        }
        a.pop_back(max);
        if(i%2==1){
            alice+=max;
        }
        else if(i%2==0){
            bob+=max;
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:19: error: no matching function for call to 'std::vector<int>::pop_back(int&)'
   18 |         a.pop_back(max);
      |         ~~~~~~~~~~^~~~~
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:1324:7: note: candidate: 'void std::vector<_Tp, _Alloc>::pop_back() [with _Tp = int; _Alloc = std::allocator<int>]'
 1324 |       pop_back() _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1324:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> number(N);
  
  for (int i = 0; i < N; i++) {
    cin >> number.at(i) ;
  }
  sort(number.begin(), number.end());
  reverse(number.begin(), number.end());
  
  int sumA = 0, sumB = 0;
  
  for (int j = 0; j < N; j++) {
    if ((2 * i) < N) {
      break;
    }
    sumA += number.at(2 * i);
  }
  
  for (int k = 0; k < N; k++) {
    if((2 * i + 1) < N) {
      break;
    }
    sumB += number.at(2 * i + 1);
  }
  
  cout << sumA - sumB << endl;
}
    
  
  
    

Compiler output:
a.cc: In function 'int main()':
a.cc:18:14: error: 'i' was not declared in this scope
   18 |     if ((2 * i) < N) {
      |              ^
a.cc:21:27: error: 'i' was not declared in this scope
   21 |     sumA += number.at(2 * i);
      |                           ^
a.cc:25:13: error: 'i' was not declared in this scope
   25 |     if((2 * i + 1) < N) {
      |             ^
a.cc:28:27: error: 'i' was not declared in this scope
   28 |     sumB += number.at(2 * i + 1);
      |                           ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:16:7: error: 'j' was not declared in this scope
   16 |   for(j=0;j<N;j++){
      |       ^
Language: C++

nt main(){
    int N;
    cin >> N;
    int AA[N];
    int Alice = 0;
    int Bob = 0;

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

    sort(AA, AA + N);
    // sort(AA, AA + N, greater<int>());

    for (int i=0; i<N; i++){
        int j = N - i - 1;
        if (j % 2 == 0){
            Alice += AA[j];
        } else {
            Bob += AA[j];
        }
    }
    cout << Alice - Bob << endl;
}

Compiler output:
a.cc:1:1: error: 'nt' does not name a type; did you mean 'int'?
    1 | nt main(){
      | ^~
      | int
Language: C++

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

int main() {
  int N,A,B;
  cin >> N;
  vector<int> a(N);
  vector<int> allzero(N,0);
  for (int i = 0; i < M; i++) {
    cin >> a.at(i);
  }

  while(a != allzero){

	sort(a.begin(), a.end());
  	reverse(a.begin(), a.end());
  	
  	A += a.at(0);
  	a.at(0) = 0;

  	B += a.at(1);
  	a.at(1) = 0;
  }

  cout << A-B << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: error: 'M' was not declared in this scope
   11 |   for (int i = 0; i < M; i++) {
      |                       ^
Language: C++

#include<iostream>
using namespace std;

int main() {
  int N
  cin >> N;
  vector<int> a(N);
  for(int i=0;i<N;++i){
    cin >> a[i];
  }
  sort(a.begin(),a.end());
  
  int al,bo;
  al = 0;
  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:6:3: error: expected initializer before 'cin'
    6 |   cin >> N;
      |   ^~~
a.cc:7:3: error: 'vector' was not declared in this scope
    7 |   vector<int> a(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:7:10: error: expected primary-expression before 'int'
    7 |   vector<int> a(N);
      |          ^~~
a.cc:8:17: error: 'N' was not declared in this scope
    8 |   for(int i=0;i<N;++i){
      |                 ^
a.cc:9:12: error: 'a' was not declared in this scope
    9 |     cin >> a[i];
      |            ^
a.cc:11:8: error: 'a' was not declared in this scope
   11 |   sort(a.begin(),a.end());
      |        ^
a.cc:11:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   11 |   sort(a.begin(),a.end());
      |   ^~~~
      |   short
a.cc:16:17: error: 'N' was not declared in this scope
   16 |   for(int i=0;i<N;++i){
      |                 ^
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 整数の入力
		int n = sc.nextInt();
        List<Integer> list = new ArrayList<>();
        for (int i = 0; i <= n; i++) {
            list.add(sc.nextInt());
        }
        Collections.sort(list);
		// Alice,Bob got poit.
		int a = 0;
        int b = 0;
        for (int i = 0; i <= n; i+=2) {
            a += list.get(i);
            if (i < n) {
                b += list.get(i+1);
            }
        }
		// 出力
		System.out.println((a-b);
	}
}


Compiler output:
Main.java:22: error: ')' or ',' expected
		System.out.println((a-b);
		                        ^
1 error
Language: C++

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

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

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.begin(), a.end());
      |     ^~~~
      |     short
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());
  int sumA=0,sumB=0;
  for(int i=0;i<N;i+=2){
    sumA+=v.at(i);
  }
  for(int i=1;i<N;i+=2){
    sumB+=v.at(i):
  }
  if(sumA>=sumB)cout<<sumA-sumB<<endl;
  else cout<<sumB-sumA<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:18: error: expected ';' before ':' token
   17 |     sumB+=v.at(i):
      |                  ^
      |                  ;