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

#include<iostream>
#include<vector>
#include<algorithm>
usnig namespace std;
int main(){
int N;
cin>>N;
vector<int>a;
  for(int i=0;i<3N;i++){
    int x;
    cin>>x;
  a.push_back(x);}
  sort(a.begin(),a.end());
  int res=0;
  for(int i=3N-1;i>2N-1;i--){
  res+=a[i];}
  cout>>res;
}


Compiler output:
a.cc:4:1: error: 'usnig' does not name a type
    4 | usnig namespace std;
      | ^~~~~
a.cc: In function 'int main()':
a.cc:7:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 | cin>>N;
      | ^~~
      | std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:1: error: 'vector' was not declared in this scope
    8 | vector<int>a;
      | ^~~~~~
a.cc:8:1: note: suggested alternatives:
In file included from /usr/include/c++/14/vector:66,
                 from a.cc:2:
/usr/include/c++/14/bits/stl_vector.h:428:11: note:   'std::vector'
  428 |     class vector : protected _Vector_base<_Tp, _Alloc>
      |           ^~~~~~
/usr/include/c++/14/vector:93:13: note:   'std::pmr::vector'
   93 |       using vector = std::vector<_Tp, polymorphic_allocator<_Tp>>;
      |             ^~~~~~
a.cc:8:8: error: expected primary-expression before 'int'
    8 | vector<int>a;
      |        ^~~
a.cc:9:17: error: unable to find numeric literal operator 'operator""N'
    9 |   for(int i=0;i<3N;i++){
      |                 ^~
a.cc:12:3: error: 'a' was not declared in this scope
   12 |   a.push_back(x);}
      |   ^
a.cc:13:8: error: 'a' was not declared in this scope
   13 |   sort(a.begin(),a.end());
      |        ^
a.cc:13:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   13 |   sort(a.begin(),a.end());
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from a.cc:3:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: 'std::sort' declared here
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
a.cc:15:13: error: unable to find numeric literal operator 'operator""N'
   15 |   for(int i=3N-1;i>2N-1;i--){
      |             ^~
a.cc:15:20: error: unable to find numeric literal operator 'operator""N'
   15 |   for(int i=3N-1;i>2N-1;i--){
      |                    ^~
a.cc:17:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   17 |   cout>>res;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for (int (i) = 0; (i) < (int)(n); i++) 
#define FOR(i, a, b) for(int (i) = a; (i) < (int)b; i++)
#define RREP(i, n) for(int (i)=((int)(n)-1); (i)>=0; i--)
#define RFOR(i, a, b) for(int (i) =((int)(b)-1); (i)>=(int)a; i--)
#define ALL(v) (v).begin(),(v).end()
#define MOD 1000000007
#define NIL -1
#define FI first
#define SE second
#define MP make_pair
#define PB push_back
#define SZ(x)  (int)x.size()
#define SP(x)  setprecision((int)x)


using namespace std ;
typedef long long ll;
typedef vector<int> vint;
typedef vector<vint> vvint;
typedef vector<string> vstr;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll LINF = 1e18;
const double EPS = 1e-9;
ll gcd(ll a, ll b) {return b ? gcd(b, a % b) : a;} //最大公約数
ll lcm(ll a, ll b) {return a / gcd(a, b) * b;} //最小公倍数

//-------------------------------------------------
// 
void yes(){
  cout <<"Yes"<<endl ;
}
void no(){
  cout <<"No"<<endl ;
}


//-------------------------------------------------
// メモ




//-------------------------------------------------


int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n ;
  cin >> n ;
  intm = n*3 ;
  vector<ll> vec(m) ;
  ll ans = 0 ;
  REP(i,m){
    cin >> vec.at(i) ;
  }
  sort(ALL(vec)) ;
  reverse(ALL(vec)) ;
  
  REP(i,n){
    ans += vec.at(i*2+1) ;
  }
  
  cout <<ans <<endl ;
    
    
    
  
  
  
  return 0 ;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:54:3: error: 'intm' was not declared in this scope; did you mean 'int'?
   54 |   intm = n*3 ;
      |   ^~~~
      |   int
a.cc:55:18: error: 'm' was not declared in this scope
   55 |   vector<ll> vec(m) ;
      |                  ^
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for (int (i) = 0; (i) < (int)(n); i++) 
#define FOR(i, a, b) for(int (i) = a; (i) < (int)b; i++)
#define RREP(i, n) for(int (i)=((int)(n)-1); (i)>=0; i--)
#define RFOR(i, a, b) for(int (i) =((int)(b)-1); (i)>=(int)a; i--)
#define ALL(v) (v).begin(),(v).end()
#define MOD 1000000007
#define NIL -1
#define FI first
#define SE second
#define MP make_pair
#define PB push_back
#define SZ(x)  (int)x.size()
#define SP(x)  setprecision((int)x)


using namespace std ;
typedef long long ll;
typedef vector<int> vint;
typedef vector<vint> vvint;
typedef vector<string> vstr;
typedef pair<int, int> pii;
const int INF = 1e9;
const ll LINF = 1e18;
const double EPS = 1e-9;
ll gcd(ll a, ll b) {return b ? gcd(b, a % b) : a;} //最大公約数
ll lcm(ll a, ll b) {return a / gcd(a, b) * b;} //最小公倍数

//-------------------------------------------------
// 
void yes(){
  cout <<"Yes"<<endl ;
}
void no(){
  cout <<"No"<<endl ;
}


//-------------------------------------------------
// メモ




//-------------------------------------------------


int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n ;
  cin >> n ;
  intm = n*3 ;
  vector<ll> vec(m) ;
  ll ans = 0 ;
  REP(i,m){
    cin >> vec.at(i) ;
  }
  sort(ALL(vec)) ;
  reverse(ALL(vec)) ;
  
  REP(i,n){
    ans += vec.at(i*2) ;
  }
  
  cout <<ans <<endl ;
    
    
    
  
  
  
  return 0 ;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:54:3: error: 'intm' was not declared in this scope; did you mean 'int'?
   54 |   intm = n*3 ;
      |   ^~~~
      |   int
a.cc:55:18: error: 'm' was not declared in this scope
   55 |   vector<ll> vec(m) ;
      |                  ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N, sum;
  sum = 0;
  cin >> N;
  vector<int> player(3*N);
  for(int i = 0; i < 3*N; i++){
   cin >> player.at(i); 
  }
  sort(player.begin(), player.end());
  reverse(player.begin(), player.end());
   int j = N;
  for(int i = 1; i < N, j++){  
   sum += player.at(i);
    i += 2;
  }
  cout << sum << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:28: error: expected ';' before ')' token
   15 |   for(int i = 1; i < N, j++){
      |                            ^
      |                            ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N, sum;
  sum = 0;
  cin >> N;
  vector<int> player(3*N);
  for(int i = 0; i < 3*N; i++){
   cin >> player.at(i); 
  }
  sort(player.begin(), player.end());
  reverse(player.begin(), player.end());
   int j = N;
  for(int i = 1; i < N, j++){
   
   sum += player.at(i);
    i += 2;
  }
  cout << sum << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:28: error: expected ';' before ')' token
   15 |   for(int i = 1; i < N, j++){
      |                            ^
      |                            ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N, sum;
  sum = 0;
  cin >> N;
  vector<int> player(3*N);
  for(int i = 0; i < 3*N; i++){
   cin >> player.at(i); 
  }
  sort(player.begin(), player.end());
  reverse(player.begin(), player.end());
   int j = N;
  for(int i = 1; i < N, i){
   
   sum += player.at(i);
    i += 2;
  }
  cout << sum << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:26: error: expected ';' before ')' token
   15 |   for(int i = 1; i < N, i){
      |                          ^
      |                          ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N, sum;
  sum = 0;
  cin >> N;
  vector<int> player(3*N);
  for(int i = 0; i < 3*N; i++){
   cin >> player.at(i); 
  }
  sort(player.begin(), player.end());
  reverse(player.begin(), player.end());
   int j = N;
  for(int i = 1; i < N){
   
   sum += player.at(i);
    i += 2;
  }
  cout << sum << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:23: error: expected ';' before ')' token
   15 |   for(int i = 1; i < N){
      |                       ^
      |                       ;
Language: C++

#include<iostream>
#include <bits/stdc++.h>

using namespace std;

int main()
{
  int n;
  cin >> n  ;
  int a[3*n] ;  
  for(int i=0;i<3*n;i++)
    cin >> a[i] ;
  
  sort(a,a+3*n,greater<int>) ; 
  int ans =0;  
  for(int i=0;i<=2*n;i++){
    if(i%2==0)ans+=a[i];
  }
    
  cout << ans << endl ;
  
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:28: error: expected primary-expression before ')' token
   14 |   sort(a,a+3*n,greater<int>) ;
      |                            ^
Language: C++

include <bits/stdc++.h>

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


int main(){
    int N;
    cin>>N;
    vector<int> a(3);
    rep(i,3*N)cin>>a[i];
    sort(a.begin(),a.begin()+3*N,greater<int>());
    llint ans=0;
    for (int i = 1; i < 2*N; )
    {
        ans+=a[i];
        i+=2;
    }
    cout<<ans<<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:10:5: error: 'cin' was not declared in this scope
   10 |     cin>>N;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | include <bits/stdc++.h>
a.cc:11:5: error: 'vector' was not declared in this scope
   11 |     vector<int> a(3);
      |     ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | include <bits/stdc++.h>
a.cc:11:12: error: expected primary-expression before 'int'
   11 |     vector<int> a(3);
      |            ^~~
a.cc:12:20: error: 'a' was not declared in this scope
   12 |     rep(i,3*N)cin>>a[i];
      |                    ^
a.cc:13:10: error: 'a' was not declared in this scope
   13 |     sort(a.begin(),a.begin()+3*N,greater<int>());
      |          ^
a.cc:13:34: error: 'greater' was not declared in this scope
   13 |     sort(a.begin(),a.begin()+3*N,greater<int>());
      |                                  ^~~~~~~
a.cc:13:42: error: expected primary-expression before 'int'
   13 |     sort(a.begin(),a.begin()+3*N,greater<int>());
      |                                          ^~~
a.cc:13:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |     sort(a.begin(),a.begin()+3*N,greater<int>());
      |     ^~~~
      |     short
a.cc:14:5: error: 'llint' was not declared in this scope; did you mean 'int'?
   14 |     llint ans=0;
      |     ^~~~~
      |     int
a.cc:17:9: error: 'ans' was not declared in this scope
   17 |         ans+=a[i];
      |         ^~~
a.cc:20:5: error: 'cout' was not declared in this scope
   20 |     cout<<ans<<endl;
      |     ^~~~
a.cc:20:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:20:11: error: 'ans' was not declared in this scope
   20 |     cout<<ans<<endl;
      |           ^~~
a.cc:20:16: error: 'endl' was not declared in this scope
   20 |     cout<<ans<<endl;
      |                ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | include <bits/stdc++.h>
Language: C++

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

long long ans, res;
long long n, m;
long long a[3e5 + 21];

int main() {
  	cin >> n;
  	m = n * 3;
  	for (int i = 1; i <= m; i++)
    	cin >> a[i];  
  	for (int i = 2; i <= m; i += 3)
  		ans += a[i];
  	for (int i = n + 1; i <= 2 * n; i++)
      	res += a[i];
  	cout << max(ans, res) << '\n';
 	return 0; 
}

Compiler output:
a.cc:6:17: error: conversion from 'double' to 'long unsigned int' in a converted constant expression
    6 | long long a[3e5 + 21];
      |             ~~~~^~~~
a.cc:6:17: error: could not convert '(3.0e+5 + (double)21)' from 'double' to 'long unsigned int'
    6 | long long a[3e5 + 21];
      |             ~~~~^~~~
      |                 |
      |                 double
a.cc:6:17: error: size of array 'a' has non-integral type 'double'
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<int> a(3*N);
  for (int i= 0; i < 3*N; i++) {
    cin >> a.at(i);
  }
  sort(a.begin(), a.end());
  reverse(a.begin(), a.end());
  
  int64 sum = 0;
  for (int i = 1; i < 2*N; i+=2) {
    sum += a.at(i);
  }
  cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:3: error: 'int64' was not declared in this scope
   14 |   int64 sum = 0;
      |   ^~~~~
a.cc:16:5: error: 'sum' was not declared in this scope
   16 |     sum += a.at(i);
      |     ^~~
a.cc:18:11: error: 'sum' was not declared in this scope
   18 |   cout << sum << endl;
      |           ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int N;cin>>N;long long int x=0;
  vector<int>a(3*N);
  for(int i=0;i<3*N;i++)cin>>A.at(i);
  sort(A.begin(),A.end());
  for(int i=N;i<2*N;i++)x+=A.at(i);
  cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:30: error: 'A' was not declared in this scope
    6 |   for(int i=0;i<3*N;i++)cin>>A.at(i);
      |                              ^
a.cc:7:8: error: 'A' was not declared in this scope
    7 |   sort(A.begin(),A.end());
      |        ^
Language: C++

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

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll n;
  cin >> n;
  vector<ll> vec(3 * n);
  for (ll i = 0; i < 3 * n; ++i) {
    cin >> vec[i];
  }
  sort(vec.begin(), vec.end());
  ll ans = 0;
  for(long j=3* n-2;n-1<j;j-=2)
    ans += a[j];
//  debug(ans);
  cout << ans << '\n';
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:12: error: 'a' was not declared in this scope
   18 |     ans += a[j];
      |            ^
Language: C++

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

int main()
{
  long long N;
  cin >> N;
  long long N3 = N * 3;
  long a[N3];
  for (int i = 0; i < N * 3; i++)
  {
    cin >> a[i];
  }
  
  sort(a, a　+　N3, greater<long long>()); //vectorにするとa+N3ができない。
  long long ans = 0;
  for (int i = 0; i < N; i++)
  {
    ans += a[i * 2 + 1];
  }
  cout << ans << endl;
}

Compiler output:
a.cc:17:11: error: extended character 　 is not valid in an identifier
   17 |   sort(a, a　+　N3, greater<long long>()); //vectorにするとa+N3ができない。
      |           ^
a.cc:17:15: error: extended character 　 is not valid in an identifier
   17 |   sort(a, a　+　N3, greater<long long>()); //vectorにするとa+N3ができない。
      |               ^
a.cc: In function 'int main()':
a.cc:17:11: error: 'a\U00003000' was not declared in this scope
   17 |   sort(a, a　+　N3, greater<long long>()); //vectorにするとa+N3ができない。
      |           ^~~
a.cc:17:15: error: '\U00003000N3' was not declared in this scope
   17 |   sort(a, a　+　N3, greater<long long>()); //vectorにするとa+N3ができない。
      |               ^~~~
Language: C++

#include <iostream>
using namespace std;


int main() {
  int N;
  cin >> N;
  int a[3*N];
for (int i=0; i < 3*N; i++) cin >> a[i];


sort(a, a+3*N);
int sum=0;
for(int i=N; i<2*N; i++){
    sum += a[i];
  }
  
  cout << sum << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:12:1: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 | sort(a, a+3*N);
      | ^~~~
      | short
Language: C++

#include <iostream>
using namespace std;


int main() {
  int N;
  cin >> N;
  int a[3*N];
for (int i=0; i < 3*N; i++) cin >> a[i];


sort(a, a+3*N, greater<int>());
int sum=0;
for(int i=N; i<2*N; i++){
    sum += a[i];
  }
  
  cout << sum << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:12:1: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 | sort(a, a+3*N, greater<int>());
      | ^~~~
      | short
Language: Java

import java.util.Scanner;
import java.util.Arrays;
public class Main{
  public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    long sum = 0;
    long[] scoreList = new long[N*3 +100];
    for(int i =0; i < N*3; i++)
      scoreList[i] = sc.nextLong();
    
    Arrays.sort(scoreList);
    for(i = N; i < N*2; i++){
      sum += scoreList[i];
    }   
    System.out.println(scoreList); 
  }
}


Compiler output:
Main.java:13: error: cannot find symbol
    for(i = N; i < N*2; i++){
        ^
  symbol:   variable i
  location: class Main
Main.java:13: error: cannot find symbol
    for(i = N; i < N*2; i++){
               ^
  symbol:   variable i
  location: class Main
Main.java:13: error: cannot find symbol
    for(i = N; i < N*2; i++){
                        ^
  symbol:   variable i
  location: class Main
Main.java:14: error: cannot find symbol
      sum += scoreList[i];
                       ^
  symbol:   variable i
  location: class Main
4 errors
Language: Java

import java.util.Scanner;
import java.util.Arrays;
public class Main{
  public static void main(String[] args){
	Scanner sc = new Scanner(System.in);
    int N = sc.nextInt();
    long sum = 0;
    long[] scoreList = new long[N*3 +100];
    for(int i =0; i < N*3; i++)
      long[i] = sc.nextLong();
    
    Arrays.sort(scoreList);
    for(i = N; i < 2N; i++){
      sum += scoreList[i];
    }   
    System.out.println(scoreList); 
  }
}

Compiler output:
Main.java:10: error: ']' expected
      long[i] = sc.nextLong();
           ^
Main.java:10: error: ';' expected
      long[i] = sc.nextLong();
            ^
Main.java:13: error: ';' expected
    for(i = N; i < 2N; i++){
                    ^
Main.java:13: error: ')' expected
    for(i = N; i < 2N; i++){
                     ^
Main.java:13: error: ';' expected
    for(i = N; i < 2N; i++){
                          ^
5 errors
Language: C++

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

int main(){
    int n;
    cin >> n;
    long long numTeam = n * 3;
    vector<long long> a(numTeam);
    long long ans = 0;
    for (long long i = 0; i < numTeam; i++) cin >> a.at(i);
    
    sort(a.begin(), a.end());
    
    for (long long i = n + 1; i < 2n + 1; i++){
        ans += a.at(i);
    }
    
    cout << ans << endl;
    
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:35: error: unable to find numeric literal operator 'operator""n'
   14 |     for (long long i = n + 1; i < 2n + 1; i++){
      |                                   ^~
Language: C++

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

int main(){
    int n;
    cin >> n;
    int numTeam = n * 3;
    vector<long long> a(numTeam);
    long long ans = 0;
    for (int i = 0; i < numTeam; i++) cin >> a.at(i);
    
    sort(a.begin(), a.end());
    
    for (int i = n + 1; i < 2n + 1; i++){
        ans += a.at(i);
    }
    
    cout << ans << endl;
    
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:29: error: unable to find numeric literal operator 'operator""n'
   14 |     for (int i = n + 1; i < 2n + 1; i++){
      |                             ^~
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(void){
   int n;
   cin >> n;
   int a[3*n];
   for(int i=0;i<n;++i){
	  cin >> a[i];
   }
   std::sort(a,a+n,greater<int>());
   int sum1=0;
   for(int i=0;i<2*n;++i){
	  if(i%2==1){
	  	sum1 += a[i];
	  }
   cout << sum1 <<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:2: error: expected '}' at end of input
   20 | }
      |  ^
a.cc:5:15: note: to match this '{'
    5 | int main(void){
      |               ^
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(void){
   int n;
   cin >> n;
   int a[3*n];
   for(int i=0;i<n;++i){
	  cin >> a[i];
   }
   std::sort(v,v+n,greater<int>());
   int sum1=0;
   for(int i=0;i<2*n;++i){
	  if(i%2==1){
	  	sum1 += a[i];
	  }
   cout << sum1 <<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:14: error: 'v' was not declared in this scope
   12 |    std::sort(v,v+n,greater<int>());
      |              ^
a.cc:20:2: error: expected '}' at end of input
   20 | }
      |  ^
a.cc:5:15: note: to match this '{'
    5 | int main(void){
      |               ^
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
using namespace std;
int main(void){
   int n;
   cin >> n;
   int v[3*n];
   for(int i=0;i<n;++i){
	  cin >> a[i];
   }
   std::sort(v,v+n,greater<int>());
   int sum1=0;
   for(int i=0;i<2*n;++i){
	  if(i%2==1){
	  	sum1 += a[i];
	  }
   cout << sum1 <<endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:18: error: 'a' was not declared in this scope
   10 |           cin >> a[i];
      |                  ^
a.cc:16:25: error: 'a' was not declared in this scope
   16 |                 sum1 += a[i];
      |                         ^
a.cc:20:2: error: expected '}' at end of input
   20 | }
      |  ^
a.cc:5:15: note: to match this '{'
    5 | int main(void){
      |               ^
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(ll i = 0; i < (ll)n; i++)
#define FOR(i, a, b) for(ll i = (a); i < (ll)b; i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define INF (1ll << 60)
#define sz(x) int(x.size())
using namespace std;
typedef long long ll;
using vl = vector<ll>;
using vvl = vector<vl>;
typedef double db;
typedef string str;
typedef pair<ll, ll> p;
constexpr int MOD = 1000000007;
using ll = long long;
template <class T> inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T> inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

void print(const std::vector<int> &v) {
    std::for_each(v.begin(), v.end(), [](int x) { std::cout << x << " "; });
    std::cout << std::endl;
}

// http://drken1215.hatenablog.com/entry/2019/03/28/014100

int main() {
    int N;
    cin >> N;
    vector<ll> A(3 * N);
    REP(i, 3 * N) { cin >> A[i]; }
    sort(A.begin(), A.end());
    ll ans = 0;
    REP(N, 2 * N) { ans += A[i]; }
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:45:30: error: 'i' was not declared in this scope
   45 |     REP(N, 2 * N) { ans += A[i]; }
      |                              ^
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<long int> a(3 * n);
  for(int i = 0; i < 3 * n; i++){
    cin >> a.at(i);
  }
  sort<a.begin(),a.end()>;
  long int out = 0;
  for(int i = 0; i < n; i++){
    out += a.at(i * 3 + 1);
  }
  cout << out;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:15: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]'
   11 |   sort<a.begin(),a.end()>;
      |        ~~~~~~~^~
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:873:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]' declared here
  873 |       begin() _GLIBCXX_NOEXCEPT
      |       ^~~~~
a.cc:11:23: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]'
   11 |   sort<a.begin(),a.end()>;
      |                  ~~~~~^~
/usr/include/c++/14/bits/stl_vector.h:893:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]' declared here
  893 |       end() _GLIBCXX_NOEXCEPT
      |       ^~~
a.cc:11:3: error: statement cannot resolve address of overloaded function
   11 |   sort<a.begin(),a.end()>;
      |   ^~~~~~~~~~~~~~~~~~~~~~~
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<long int> a(n);
  for(int i = 0; i < 3 * n; i++){
    cin >> a.at(i);
  }
  sort<a.begin(),a.end()>;
  long int out = 0;
  for(int i = 0; i < n; i++){
    out += a.at(i * 3 + 1);
  }
  cout << out;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:15: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]'
   11 |   sort<a.begin(),a.end()>;
      |        ~~~~~~~^~
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:873:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::begin() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]' declared here
  873 |       begin() _GLIBCXX_NOEXCEPT
      |       ^~~~~
a.cc:11:23: error: call to non-'constexpr' function 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]'
   11 |   sort<a.begin(),a.end()>;
      |                  ~~~~~^~
/usr/include/c++/14/bits/stl_vector.h:893:7: note: 'std::vector<_Tp, _Alloc>::iterator std::vector<_Tp, _Alloc>::end() [with _Tp = long int; _Alloc = std::allocator<long int>; iterator = std::vector<long int>::iterator]' declared here
  893 |       end() _GLIBCXX_NOEXCEPT
      |       ^~~
a.cc:11:3: error: statement cannot resolve address of overloaded function
   11 |   sort<a.begin(),a.end()>;
      |   ^~~~~~~~~~~~~~~~~~~~~~~
Language: C++

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

int main() {
	int n; cin >> n;
	vector<int>a(3*n); for (auto&& x : a)cin >> x;
	sort(a.begin(), a.end());
	long long ans = 0;
	for (int i = 3 * n - 2, cnt = 0; cnt < n; i -= 2, cnt++) {
		ans += a[i];
	}
	cout << ans << endl;

	return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:16:18: error: expected '}' at end of input
   16 |         return 0;
      |                  ^
a.cc:6:12: note: to match this '{'
    6 | int main() {
      |            ^
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<long long> a(3*N);
  REP(i, 0, 3*N) cin >> a.at(i);
  sort(a.begin(), a.end(), greater<int>);
  long long ans = 0;
  REP(i, 0, N) ans += a.at(N+i+1);
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:40: error: expected primary-expression before ')' token
   10 |   sort(a.begin(), a.end(), greater<int>);
      |                                        ^
Language: C++

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

int main () {
  int N;
  std::cin >> N;
  std::vector<int> data(3*N);
  for (int i=0; i<3*N; i++) {
    std::cin >> data.at(i);
  }
  std::sort(data.begin(), data.rend());
  int sum = 0;
  for (int i=1; i<2*N+1; i+=2) {
    sum += data.at(i);
  }
  std::cout << sum << std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:12: error: no matching function for call to 'sort(std::vector<int>::iterator, std::vector<int>::reverse_iterator)'
   12 |   std::sort(data.begin(), data.rend());
      |   ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:4762:5: note: candidate: 'template<class _RAIter> void std::sort(_RAIter, _RAIter)'
 4762 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last)
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4762:5: note:   template argument deduction/substitution failed:
a.cc:12:12: note:   deduced conflicting types for parameter '_RAIter' ('__gnu_cxx::__normal_iterator<int*, std::vector<int> >' and 'std::reverse_iterator<__gnu_cxx::__normal_iterator<int*, std::vector<int> > >')
   12 |   std::sort(data.begin(), data.rend());
      |   ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note: candidate: 'template<class _RAIter, class _Compare> void std::sort(_RAIter, _RAIter, _Compare)'
 4793 |     sort(_RandomAccessIterator __first, _RandomAccessIterator __last,
      |     ^~~~
/usr/include/c++/14/bits/stl_algo.h:4793:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator, class _Compare> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator, _Compare)'
  292 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last, _Compare __comp);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:292:1: note:   candidate expects 4 arguments, 2 provided
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note: candidate: 'template<class _ExecutionPolicy, class _RandomAccessIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::sort(_ExecutionPolicy&&, _RandomAccessIterator, _RandomAccessIterator)'
  296 | sort(_ExecutionPolicy&& __exec, _RandomAccessIterator __first, _RandomAccessIterator __last);
      | ^~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:296:1: note:   candidate expects 3 arguments, 2 provided
Language: Java

package AGC_A;

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

public class AtCoderGroupContest {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		Long[] a = new Long[N*3];
		
		for(int i = 0; i < N*3 ;i++) {
			a[i] = sc.nextLong();
		}
		
		Arrays.sort(a);
		
		long ans = 0;
		int index = 0;
		
		for(int i = N*3 ; i-2 > index ; i -= 2 ) {
			ans += a[i-2];
			index++;
		}
		System.out.println(ans);
	}
}


Compiler output:
Main.java:6: error: class AtCoderGroupContest is public, should be declared in a file named AtCoderGroupContest.java
public class AtCoderGroupContest {
       ^
1 error
Language: C++

#include<bits/stdc++.h>

using namespace std;

int main(){
  int n;
  cin >> n;
  
  int a[n];
  for (int i =0; i < n * 3; ++i) cin >> a[i];
  
  sort(a, a + n, greater<int>());
  int cnt = 0;
  int cur = n * 3 - 2;
  long long ans = 0;
  while (cnt < n) {
    ans += a[cur]
    cnt++;
    cur -= 2;
  }
  
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:18: error: expected ';' before 'cnt'
   17 |     ans += a[cur]
      |                  ^
      |                  ;
   18 |     cnt++;
      |     ~~~
Language: C++

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

int int_len(int n) {
  int s=0;
  while(n!=0) s++, n/=10;
  return s;
}

int int_sum(int n) {
  int m=0,s=0,a=n;
  while(a!=0) s++, a/=10;
  for(int i=s-1;i>=0;i--) m+=n/((int)pow(10,i))-(n/((int)pow(10,i+1)))*10;
  return m;
}

int vec_sum(vector<int> v){
  int n,ans=0;
  for(int i=0;i<v.size();i++) n+=v[i];
  return n;
}

int main() {
  int n;
  cin>>n;
  vector<int> v(n);
  rep(i,n*3) cin>>v[i];
  rep(i,n){
    if(v[i*3]<=v[i*3+1] && v[i*3+1]<=v[i*3+2] || v[i*3+2]<=v[i*3+1] && v[i*3+1] <= v[i*3]){
      ans+=v[i*3+1];
    }else if(v[i*3+1]<=v[i*3+2] && v[i*3+2]<=v[i*3] || v[i*3]<=v[i*3+2] && v[i*3+2] <= v[i*3+1]){
      ans+=v[i*3+2];
    }else{
      ans+=v[i*3];
    }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   31 |       ans+=v[i*3+1];
      |       ^~~
      |       abs
a.cc:33:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   33 |       ans+=v[i*3+2];
      |       ^~~
      |       abs
a.cc:35:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   35 |       ans+=v[i*3];
      |       ^~~
      |       abs
a.cc:38:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   38 |   cout<<ans<<endl;
      |         ^~~
      |         abs
Language: C++

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

#define rep(i, n) for(int i = 0; i < (int)n; i++)
#define rep2(i, m, n) for(int i = (int)m; i < (int)n; i++)
typedef unsigned long long ll;
typedef long double ld;
typedef vector<int> vi;
typedef vector<vi> vii; //2次元配列
typedef vector<ll> vll;
typedef vector<string> vs;


/*FUNCs=================================================*/


/*MAIN==================================================*/
int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);   //cin cout 高速化

    ll n, cnt = 0; cin >> n;
    vll a(3*n);
    rep(i,3*n) cin >> a[i];
    sort(a.begin(), a.end());
    for(int i = n, i < (2*n)-1; i += 2) cnt += a[i];
    cout << cnt <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:21: error: expected ';' before '<' token
   26 |     for(int i = n, i < (2*n)-1; i += 2) cnt += a[i];
      |                     ^~
      |                     ;
a.cc:26:22: error: expected primary-expression before '<' token
   26 |     for(int i = n, i < (2*n)-1; i += 2) cnt += a[i];
      |                      ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n,a,cnt=0;
vector<int> v;
int main(){
	scanf("%d",&n);
	for(int i=1;i<3*n;i++){
		scanf("%d",&a);
		v.push_back(-a);
	}
	sort(v.begin(),v.end());
	for(int i=0;i<v.size();i++){
		v[i]=-v[i];
	}
	for(int i=1;i<=n;i++){
		cnt+=[2*i-1];
	}
	printf("%d",cnt);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:23: error: expected identifier before numeric constant
   16 |                 cnt+=[2*i-1];
      |                       ^
a.cc: In lambda function:
a.cc:16:29: error: expected '{' before ';' token
   16 |                 cnt+=[2*i-1];
      |                             ^
a.cc: In function 'int main()':
a.cc:16:20: error: no match for 'operator+=' (operand types are 'int' and 'main()::<lambda()>')
   16 |                 cnt+=[2*i-1];
      |                 ~~~^~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, j, n) for (ll i = j; i < n; i++)
#define all(x) (x).begin(),(x).end()
#define INF (1000000000)
#define MOD (1000000007)
#define MAX (100000)
#define pii pair<int, int>

/////////////////////////////////////////////////////////

class XY{
public:
  ll x, y;
  XY() {x = y = 0;}
  XY(ll u, ll v) {x = u; y = v;}
};

template<typename T1, typename T2>
void chmin(T1 &a, T2 b) {if(a > b) a = b;}
template<typename T1, typename T2>
void chmax(T1 &a, T2 b) {if(a < b) a = b;}

template<typename T1, typename T2>
ll mypow(T1 a, T2 n){
  if(n == 0) return 1;
  if(n == 1) return a;
  if(n % 2) return a * mypow(a, n - 1);
  ll tmp = mypow(a, n / 2);
  return tmp * tmp;
}

template<typename T>
int BS(vector<T> V, int left, int right, T key){
  int mid = (left + right) / 2;
  if(V[mid] <= key) left = mid;
  else right = mid;
  if(right - mid == 1) return left;
  else return BS(V, left, right, key);
}

ll comb(ll n, ll r){
	ll res = 1;
  rep(i, 0, r){
    res *= n - i;
    res /= i + 1;
  }
  return res;
}

/////////////////////////////////////////////////////////

void Main() {
  int N; cin >> N;
  vector<ll> A(3 * N);
  rep(i, 0, 3 * N) cin >> A[i];
  sort(all(A), greater<ll>());

  ll res = 0:
  rep(i, 0, N){
    res += A[2 * i + 1];
  }
  cout << res << endl;
}

/////////////////////////////////////////////////////////

int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << std::fixed << std::setprecision(15);

  Main();
}


Compiler output:
a.cc: In function 'void Main()':
a.cc:60:13: error: expected ',' or ';' before ':' token
   60 |   ll res = 0:
      |             ^
a.cc:61:7: error: 'i' was not declared in this scope
   61 |   rep(i, 0, N){
      |       ^
a.cc:4:37: note: in definition of macro 'rep'
    4 | #define rep(i, j, n) for (ll i = j; i < n; i++)
      |                                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, j, n) for (ll i = j; i < n; i++)
#define all(x) (x).begin(),(x).end()
#define INF (1000000000)
#define MOD (1000000007)
#define MAX (100000)
#define pii pair<int, int>

/////////////////////////////////////////////////////////

class XY{
public:
  ll x, y;
  XY() {x = y = 0;}
  XY(ll u, ll v) {x = u; y = v;}
};

template<typename T1, typename T2>
void chmin(T1 &a, T2 b) {if(a > b) a = b;}
template<typename T1, typename T2>
void chmax(T1 &a, T2 b) {if(a < b) a = b;}

template<typename T1, typename T2>
ll mypow(T1 a, T2 n){
  if(n == 0) return 1;
  if(n == 1) return a;
  if(n % 2) return a * mypow(a, n - 1);
  ll tmp = mypow(a, n / 2);
  return tmp * tmp;
}

template<typename T>
int BS(vector<T> V, int left, int right, T key){
  int mid = (left + right) / 2;
  if(V[mid] <= key) left = mid;
  else right = mid;
  if(right - mid == 1) return left;
  else return BS(V, left, right, key);
}

ll comb(ll n, ll r){
	ll res = 1;
  rep(i, 0, r){
    res *= n - i;
    res /= i + 1;
  }
  return res;
}

/////////////////////////////////////////////////////////

void Main() {
  int N; cin >> N;
  vector<ll> A(3 * N);
  rep(i, 0, 3 * N) cin >> A[i];
  sort(all(A), greater<ll>);

  ll res = 0:
  rep(i, 0, N){
    res += A[2 * i + 1];
  }
  cout << res << endl;
}

/////////////////////////////////////////////////////////

int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << std::fixed << std::setprecision(15);

  Main();
}


Compiler output:
a.cc: In function 'void Main()':
a.cc:58:27: error: expected primary-expression before ')' token
   58 |   sort(all(A), greater<ll>);
      |                           ^
a.cc:60:13: error: expected ',' or ';' before ':' token
   60 |   ll res = 0:
      |             ^
a.cc:61:7: error: 'i' was not declared in this scope
   61 |   rep(i, 0, N){
      |       ^
a.cc:4:37: note: in definition of macro 'rep'
    4 | #define rep(i, j, n) for (ll i = j; i < n; i++)
      |                                     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, j, n) for (ll i = j; i < n; i++)
#define all(x) (x).begin(),(x).end()
#define INF (1000000000)
#define MOD (1000000007)
#define MAX (100000)
#define pii pair<int, int>

/////////////////////////////////////////////////////////

class XY{
public:
  ll x, y;
  XY() {x = y = 0;}
  XY(ll u, ll v) {x = u; y = v;}
};

template<typename T1, typename T2>
void chmin(T1 &a, T2 b) {if(a > b) a = b;}
template<typename T1, typename T2>
void chmax(T1 &a, T2 b) {if(a < b) a = b;}

template<typename T1, typename T2>
ll mypow(T1 a, T2 n){
  if(n == 0) return 1;
  if(n == 1) return a;
  if(n % 2) return a * mypow(a, n - 1);
  ll tmp = mypow(a, n / 2);
  return tmp * tmp;
}

template<typename T>
int BS(vector<T> V, int left, int right, T key){
  int mid = (left + right) / 2;
  if(V[mid] <= key) left = mid;
  else right = mid;
  if(right - mid == 1) return left;
  else return BS(V, left, right, key);
}

ll comb(ll n, ll r){
	ll res = 1;
  rep(i, 0, r){
    res *= n - i;
    res /= i + 1;
  }
  return res;
}

/////////////////////////////////////////////////////////

void Main() {
  int N; cin >> N;
  vector<ll> A(3 * N);
  rep(i, 0, 3 * N) cin >> A[i];
  sort(all(A), greater<ll>)

  int res = 0:
  rep(i, 0, N){
    res += A[2 * i + 1];
  }
  cout << res << endl;
}

/////////////////////////////////////////////////////////

int main(){
  cin.tie(nullptr);
  ios_base::sync_with_stdio(false);
  cout << std::fixed << std::setprecision(15);

  Main();
}


Compiler output:
a.cc: In function 'void Main()':
a.cc:58:27: error: expected primary-expression before ')' token
   58 |   sort(all(A), greater<ll>)
      |                           ^
a.cc:61:7: error: 'i' was not declared in this scope
   61 |   rep(i, 0, N){
      |       ^
a.cc:4:37: note: in definition of macro 'rep'
    4 | #define rep(i, j, n) for (ll i = j; i < n; i++)
      |                                     ^
a.cc:64:11: error: 'res' was not declared in this scope; did you mean 'rep'?
   64 |   cout << res << endl;
      |           ^~~
      |           rep
Language: C++

#include<iostream>
using namespace std ;

void Sort(int length[], int N){
  int i,j,k,m ;
  for(i=1;i<N;i++){
    k=i ;
    m=length[i] ;
    j=i-1 ;
    while(length[j]<m && j>=0){
      length[j+1] = length[j] ;
      j-- ;
    }
    length[j+1] = m ;
  }
}


int main(){
  int N,i,sum=0;
  int a[300001] ;

  cin >> N ;
  for(i=0;i<3*N;i++){
    cin >> a[i] ;
  }

  Sort(a,3*N) ;


  for(i=0;3i+1<3*N;i++){
    sum = sum + a[3i+1] ;
  }


  cout << sum ;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:15: error: invalid operands of types '__complex__ int' and 'int' to binary 'operator<'
   31 |   for(i=0;3i+1<3*N;i++){
      |               ^~~~
      |                 |
      |                 int
a.cc:32:18: error: invalid types 'int [300001][__complex__ int]' for array subscript
   32 |     sum = sum + a[3i+1] ;
      |                  ^
Language: C++

#include<iostream>
using namespace std ;

void Sort(int length[], int N){
  int i,j,k,m ;
  for(i=1;i<N;i++){
    k=i ;
    m=length[i] ;
    j=i-1 ;
    while(length[j]<m && j>=0){
      length[j+1] = length[j] ;
      j-- ;
    }
    length[j+1] = m ;
  }
}


int main(){
  int N,i,sum=0;
  int a[300001] ;

  cin >> N ;
  for(i=0;i<3*N;i++){
    cin >> a[i] ;
  }

  Sort(a,3*N) ;


  for(i=0;3i+1<3*N;i++){
    sum = sum + a[3i+1]
  }


  cout << sum ;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:31:15: error: invalid operands of types '__complex__ int' and 'int' to binary 'operator<'
   31 |   for(i=0;3i+1<3*N;i++){
      |               ^~~~
      |                 |
      |                 int
a.cc:32:18: error: invalid types 'int [300001][__complex__ int]' for array subscript
   32 |     sum = sum + a[3i+1]
      |                  ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;cin>>n;
  int a[3*n];for(int i=0;i<3*n;i++)cin>>a[i];
  sort(a,a+(3*n));
  int score = 0;
  for(int i=0;i<=2*n;i++){((i%2==0&&i>0)?score+=a[i]:);}
  cout<<score<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:54: error: expected primary-expression before ')' token
    8 |   for(int i=0;i<=2*n;i++){((i%2==0&&i>0)?score+=a[i]:);}
      |                                                      ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;cin>>n;
  int a[3*n];for(int i=0;i<3*n;i++)cin>>a[i];
  sort(a,a+(3*n));
  int score = 0;
  for(int i=0;i<3*n;i++){((i%2==0&&i>0)?score+=a[i]:);}
  cout<<score<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:53: error: expected primary-expression before ')' token
    8 |   for(int i=0;i<3*n;i++){((i%2==0&&i>0)?score+=a[i]:);}
      |                                                     ^
Language: C++

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

int main(){
  int N; cin>>N;
  vector<int> L(3N);
  for (int i=0;i<3N;++i){
    cin>>L[i];
  }
  sort(L.begin(),L.end());
  int ans=0;
  for (int i=N;i<2N;++i){
    ans+=L[i];
  }
  cout<<ans<<endl;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: unable to find numeric literal operator 'operator""N'
    8 |   vector<int> L(3N);
      |                 ^~
a.cc:9:18: error: unable to find numeric literal operator 'operator""N'
    9 |   for (int i=0;i<3N;++i){
      |                  ^~
a.cc:14:18: error: unable to find numeric literal operator 'operator""N'
   14 |   for (int i=N;i<2N;++i){
      |                  ^~
Language: C++

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

int main(){
  int N; cin>>N;
  vector<int> L(3N);
  for (int i=0;i<3N;++i){
    cin>>L[i];
  }
  sort(L.begin(),L.end());
  int ans=0+
  for (int i=N;i<2N;++i){
    ans+=L[i];
  }
  cout<<ans<<endl;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: unable to find numeric literal operator 'operator""N'
    8 |   vector<int> L(3N);
      |                 ^~
a.cc:9:18: error: unable to find numeric literal operator 'operator""N'
    9 |   for (int i=0;i<3N;++i){
      |                  ^~
a.cc:14:3: error: expected primary-expression before 'for'
   14 |   for (int i=N;i<2N;++i){
      |   ^~~
a.cc:14:16: error: 'i' was not declared in this scope
   14 |   for (int i=N;i<2N;++i){
      |                ^
a.cc:14:18: error: unable to find numeric literal operator 'operator""N'
   14 |   for (int i=N;i<2N;++i){
      |                  ^~
Language: C++

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

using namespace std;
using ll = long long;

int main() {
	ll n;
	cin >> n;
	vector<int> a(3 * n);
	for (int i = 0; i < 3 * n; i++) {
		cin >> a[i];
	}
	ll ans = 0;
	sort(a.begin(), a.end());
	for (int i = n; i < 3 * n; i+=2) {
		ans += a[i];

	}
	cout << ans << endl;

	return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:23:18: error: expected '}' at end of input
   23 |         return 0;
      |                  ^
a.cc:8:12: note: to match this '{'
    8 | int main() {
      |            ^
Language: C++

int main() {
    int n;
    cin >> n;
    vector<int> l(3*n);
    for (auto &c:l) {cin >> c;}
    sort(l.begin(),l.end());

    long long count=0;
    for (int i=0;i<n;i++) {count += l[3*n-2-2*i];}
    cout << count << endl;
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:3:5: error: 'cin' was not declared in this scope
    3 |     cin >> n;
      |     ^~~
a.cc:4:5: error: 'vector' was not declared in this scope
    4 |     vector<int> l(3*n);
      |     ^~~~~~
a.cc:4:12: error: expected primary-expression before 'int'
    4 |     vector<int> l(3*n);
      |            ^~~
a.cc:5:18: error: 'l' was not declared in this scope
    5 |     for (auto &c:l) {cin >> c;}
      |                  ^
a.cc:6:10: error: 'l' was not declared in this scope
    6 |     sort(l.begin(),l.end());
      |          ^
a.cc:6:5: error: 'sort' was not declared in this scope; did you mean 'short'?
    6 |     sort(l.begin(),l.end());
      |     ^~~~
      |     short
a.cc:10:5: error: 'cout' was not declared in this scope; did you mean 'count'?
   10 |     cout << count << endl;
      |     ^~~~
      |     count
a.cc:10:22: error: 'endl' was not declared in this scope
   10 |     cout << count << endl;
      |                      ^~~~
a.cc:11:14: error: expected '}' at end of input
   11 |     return 0;
      |              ^
a.cc:1:12: note: to match this '{'
    1 | int main() {
      |            ^