criyle/codenet-compile-errors huggingface dataset:
Language: Java

import java.util.*;

class AtCoder_Group_Contest {
  public static void main(String[] args) {
    Scanner sc = new Scanner("10\n1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000");
    int n = Integer.parseInt(sc.nextLine());
    String[] a = sc.nextLine().split(" ");
    List<String> list = Arrays.asList(a);
    list.sort(Comparator.reverseOrder());
    String[] tmp = (String[]) list.toArray(new String[list.size()]);
    int[] ia = new int[3 * n];
    for (int i = 0; i < 3 * n; i++) {
      ia[i] = Integer.parseInt(tmp[i]);
    }
    long ans = 0;
    for (int i = 1, j = 0; j < n; i += 2, ++j)
      ans += ia[i];
    System.out.println(ans);
  }
}import java.util.*;

class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int n = Integer.parseInt(sc.nextLine());
    String[] a = sc.nextLine().split(" ");
    List<String> list = Arrays.asList(a);
    list.sort(Comparator.reverseOrder());
    String[] tmp = (String[]) list.toArray(new String[list.size()]);
    int[] ia = new int[3 * n];
    for (int i = 0; i < 3 * n; i++) {
      ia[i] = Integer.parseInt(tmp[i]);
    }
    long ans = 0;
    for (int i = 1, j = 0; j < n; i += 2, ++j)
      ans += ia[i];
    System.out.println(ans);
  }
}

Compiler output:
Main.java:20: error: class, interface, enum, or record expected
}import java.util.*;
 ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(void){
  int n;
  cin >> n;
  
  vector<int> v(n * 3);
  for(int i = 0; i < (n * 3); i++) {
    cin >> v.at(i);
  }
  
  sort(v.begin(), v.end(), greater<int>());
  
  long ans = 0;
  for(int i = 0; i < n * 2; i++) {
    if(i % 2 != 0) {
      ans += v.at(i);
    }
  }
  
  cout << ans << endl;


Compiler output:
a.cc: In function 'int main()':
a.cc:22:23: error: expected '}' at end of input
   22 |   cout << ans << endl;
      |                       ^
a.cc:4:15: note: to match this '{'
    4 | int main(void){
      |               ^
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> vec(N*3);
  for(auto& v : vec){
    cin >> v;
  }
  sort(vec.begin(), vec.end(), greater<int>());
  int ans = 0;
  int count = N;
  bool second = false;
  for(auto& v : vec){
    if(second == false){
      second = true;
    }
    else{
      ans += v;
      second = false;
      --count;
      if(count == 0){
        break;
      }
    }
  }
  cout << ans << endl;
}


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

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

int main(){
  int N;
  cin >> N;
  vector<int> vec(N);
  for(auto& v : vec){
    cin >> v;
  }
  sort(vec.begin(), vec.end(), greater<int>());

  int ans = 0;
  int count = N;
  bool second = false;
  for(auto& v : vec){
    if(second == false){
      second = true;
    }
    else{
      ans += v;
      second = false;
      --count;
      if(count == 0){
        break;
      }
    }
  }
  cout << ans << endl;
}


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

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

int main() {
    int n; cin >> n;
    vector<int> a(3*n);
    rep(i,3*n) cin >> a[i];
    sort(a.begin(),a.end());
    reverse(a.begin,a.end());
    int sum=0;
    rep(i,n){
        sum+=a[2*i];
    }
    cout << sum << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: no matching function for call to 'reverse(<unresolved overloaded function type>, std::vector<int>::iterator)'
   10 |     reverse(a.begin,a.end());
      |     ~~~~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algo.h:1083:5: note: candidate: 'void std::reverse(_BIter, _BIter) [with _BIter = __gnu_cxx::__normal_iterator<int*, vector<int> >]'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |     ^~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1083:36: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to '__gnu_cxx::__normal_iterator<int*, std::vector<int> >'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |             ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
In file included from /usr/include/c++/14/algorithm:86:
/usr/include/c++/14/pstl/glue_algorithm_defs.h:249:1: note: candidate: 'template<class _ExecutionPolicy, class _BidirectionalIterator> __pstl::__internal::__enable_if_execution_policy<_ExecutionPolicy, void> std::reverse(_ExecutionPolicy&&, _BidirectionalIterator, _BidirectionalIterator)'
  249 | reverse(_ExecutionPolicy&& __exec, _BidirectionalIterator __first, _BidirectionalIterator __last);
      | ^~~~~~~
/usr/include/c++/14/pstl/glue_algorithm_defs.h:249:1: note:   candidate expects 3 arguments, 2 provided
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long n;
        cin >> n;
        vector<long long> a(n);
  
        for(long long i = 0; i < 3*n; i++) cin >> a[i];
        sort(a.begin(),a.end());
 
        Int ans = 0;
        int cnt = 0;
        for(long long i = 3*n-2; i >= 0; i -= 2){
                if(cnt == n) break;
                ans += a[i];
                cnt++;
        }
 
        cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'Int' was not declared in this scope; did you mean 'int'?
   11 |         Int ans = 0;
      |         ^~~
      |         int
a.cc:15:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   15 |                 ans += a[i];
      |                 ^~~
      |                 abs
a.cc:19:17: error: 'ans' was not declared in this scope; did you mean 'abs'?
   19 |         cout << ans << endl;
      |                 ^~~
      |                 abs
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:3:9: error: 'cin' was not declared in this scope
    3 |         cin >> n;
      |         ^~~
a.cc:4:9: error: 'vector' was not declared in this scope
    4 |         vector<long long> a(n);
      |         ^~~~~~
a.cc:4:16: error: expected primary-expression before 'long'
    4 |         vector<long long> a(n);
      |                ^~~~
a.cc:6:51: error: 'a' was not declared in this scope
    6 |         for(long long i = 0; i < 3*n; i++) cin >> a[i];
      |                                                   ^
a.cc:7:14: error: 'a' was not declared in this scope
    7 |         sort(a.begin(),a.end());
      |              ^
a.cc:7:9: error: 'sort' was not declared in this scope; did you mean 'short'?
    7 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
a.cc:9:9: error: 'Int' was not declared in this scope; did you mean 'int'?
    9 |         Int ans = 0;
      |         ^~~
      |         int
a.cc:13:17: error: 'ans' was not declared in this scope
   13 |                 ans += a[i];
      |                 ^~~
a.cc:17:9: error: 'cout' was not declared in this scope
   17 |         cout << ans << endl;
      |         ^~~~
a.cc:17:17: error: 'ans' was not declared in this scope
   17 |         cout << ans << endl;
      |                 ^~~
a.cc:17:24: error: 'endl' was not declared in this scope
   17 |         cout << ans << endl;
      |                        ^~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:2:9: error: 'cin' was not declared in this scope
    2 |         cin >> n;
      |         ^~~
a.cc:2:16: error: 'n' was not declared in this scope
    2 |         cin >> n;
      |                ^
a.cc:3:9: error: 'vector' was not declared in this scope
    3 |         vector<long long> a(n);
      |         ^~~~~~
a.cc:3:16: error: expected primary-expression before 'long'
    3 |         vector<long long> a(n);
      |                ^~~~
a.cc:5:51: error: 'a' was not declared in this scope
    5 |         for(long long i = 0; i < 3*n; i++) cin >> a[i];
      |                                                   ^
a.cc:6:14: error: 'a' was not declared in this scope
    6 |         sort(a.begin(),a.end());
      |              ^
a.cc:6:9: error: 'sort' was not declared in this scope; did you mean 'short'?
    6 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
a.cc:8:9: error: 'Int' was not declared in this scope; did you mean 'int'?
    8 |         Int ans = 0;
      |         ^~~
      |         int
a.cc:12:17: error: 'ans' was not declared in this scope
   12 |                 ans += a[i];
      |                 ^~~
a.cc:16:9: error: 'cout' was not declared in this scope
   16 |         cout << ans << endl;
      |         ^~~~
a.cc:16:17: error: 'ans' was not declared in this scope
   16 |         cout << ans << endl;
      |                 ^~~
a.cc:16:24: error: 'endl' was not declared in this scope
   16 |         cout << ans << endl;
      |                        ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
 
int main(){
  int N;
  cin >> N;
  vector<int> a(3*N);
  int ans = 0;
  int cnt = 0;
  for(int i = 0; i < 3*N; i++){
    cin >> a[i];
  }
  
  sort(a.begin(),a.end());
  
  for(int i = 3N -2; i >= 0 ; i -=2){
    if(cnt == N){
       break;
     }
    ans += a[i];
    cnt++;
    }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:16:15: error: unable to find numeric literal operator 'operator""N'
   16 |   for(int i = 3N -2; i >= 0 ; i -=2){
      |               ^~
Language: C++

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

int main(){
  int N;
  cin >> N;
  vector<int> a(N);
  int ans = 0;
  int cnt = 0;
  for(int i = 0; i < N; i++){
    cin >> a[i];
  }
  
  sort(a.begin(),a.end(),greater<int>());
  
  for(int i = 0; i < N; i++){
    if(i % 2 = 1){
    ans += a[i];
    cnt++;
    }
     if(cnt == N/3){
       break;
     }
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:10: error: lvalue required as left operand of assignment
   17 |     if(i % 2 = 1){
      |        ~~^~~
Language: C++

#include <stdio.h>
#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
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.begin(),a.end());
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: request for member 'begin' in 'a', which is of non-class type 'int [(n * 3)]'
   13 |         sort(a.begin(),a.end());
      |                ^~~~~
a.cc:13:26: error: request for member 'end' in 'a', which is of non-class type 'int [(n * 3)]'
   13 |         sort(a.begin(),a.end());
      |                          ^~~
Language: C++

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

int main(){
    int n;
    cin >> n;
    vector<int> a(3*n);
    for (int i=0;i<3*n;++i) cin >> a[i];
  	sort(a.begin(),a.end());
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
Language: C++

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

int main(){
    int n;
    cin >> n;
    vector(int) a(3*n);
    for (int i=0;i<3*n;++i) cin >> a[i];
  	sort(a.begin(),a.end());
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: missing template arguments before '(' token
   10 |     vector(int) a(3*n);
      |           ^
a.cc:10:12: error: expected primary-expression before 'int'
   10 |     vector(int) a(3*n);
      |            ^~~
a.cc:11:36: error: 'a' was not declared in this scope
   11 |     for (int i=0;i<3*n;++i) cin >> a[i];
      |                                    ^
a.cc:12:14: error: 'a' was not declared in this scope
   12 |         sort(a.begin(),a.end());
      |              ^
a.cc:12:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
Language: C++

int main(){
    int n;
    cin >> n;
    vector(int) a(3*n);
    for (int i=0;i<3*n;++i) cin >> a[i];
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


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:4:12: error: expected primary-expression before 'int'
    4 |     vector(int) a(3*n);
      |            ^~~
a.cc:4:5: error: 'vector' was not declared in this scope
    4 |     vector(int) a(3*n);
      |     ^~~~~~
a.cc:5:36: error: 'a' was not declared in this scope
    5 |     for (int i=0;i<3*n;++i) cin >> a[i];
      |                                    ^
a.cc:7:34: error: 'a' was not declared in this scope
    7 |     for (int i=1;i<n;++i) sum += a[3*i-2];
      |                                  ^
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout << sum << endl;
      |     ^~~~
a.cc:8:20: error: 'endl' was not declared in this scope
    8 |     cout << sum << endl;
      |                    ^~~~
Language: C++

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

int main(){
    int n;
    cin >> n;
    int a[1000000000];
    for (int i=0;i<3*n;++i) cin >> a[i];
  	sort(a.begin(),a.end());
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:16: error: request for member 'begin' in 'a', which is of non-class type 'int [1000000000]'
   12 |         sort(a.begin(),a.end());
      |                ^~~~~
a.cc:12:26: error: request for member 'end' in 'a', which is of non-class type 'int [1000000000]'
   12 |         sort(a.begin(),a.end());
      |                          ^~~
a.cc:12:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |         sort(a.begin(),a.end());
      |         ^~~~
      |         short
Language: C++

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

int main(){
    int n;
    cin >> n;
    int a[1000000000];
    for (int i=0;i<3*n;++i) cin >> a[i];
  	a.sort(a.begin(),a.end());
    int sum = 0;
    for (int i=1;i<n;++i) sum += a[3*i-2];
    cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: request for member 'sort' in 'a', which is of non-class type 'int [1000000000]'
   12 |         a.sort(a.begin(),a.end());
      |           ^~~~
a.cc:12:18: error: request for member 'begin' in 'a', which is of non-class type 'int [1000000000]'
   12 |         a.sort(a.begin(),a.end());
      |                  ^~~~~
a.cc:12:28: error: request for member 'end' in 'a', which is of non-class type 'int [1000000000]'
   12 |         a.sort(a.begin(),a.end());
      |                            ^~~
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: request for member 'sort' in 'a', which is of non-class type 'int [(n * 3)]'
   12 |         a.sort(a.begin(),a.end());
      |           ^~~~
a.cc:12:18: error: request for member 'begin' in 'a', which is of non-class type 'int [(n * 3)]'
   12 |         a.sort(a.begin(),a.end());
      |                  ^~~~~
a.cc:12:28: error: request for member 'end' in 'a', which is of non-class type 'int [(n * 3)]'
   12 |         a.sort(a.begin(),a.end());
      |                            ^~~
Language: C++

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

int main(){
  int n;
  cin >> n;
  
  vector<int> tsuyosa(3*n);
  for (int i=0; i<3*n; i++){
    cin >> tsuyosa.at(i);
  }
  
  sort(tsuyosa.begin(), tsuyosa.end(), greater<int>());
  
  int sum = 0;
  
  for(int i = 0; i < 2 * n; i++) {
    if (i % 2 == 1) {
      sum += tsuyosa(i);
    }
  }
  
  cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:21: error: no match for call to '(std::vector<int>) (int&)'
   19 |       sum += tsuyosa(i);
      |              ~~~~~~~^~~
Language: C++

#include <iostream>
#include <algorithm>

using namespace std;

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

    vector<long long> arr(3 * n);

    for(int i = 0; i < 3 * n; i++){
        cin >> arr[i];
    }

    sort(arr.begin(), arr.end());

    long long ans = 0;

    for(int i = 3 * n - 2; i >= n; i -= 2){
        ans += arr[i];
    }

    cout << ans << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'vector' was not declared in this scope
   11 |     vector<long long> arr(3 * n);
      |     ^~~~~~
a.cc:3:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    2 | #include <algorithm>
  +++ |+#include <vector>
    3 | 
a.cc:11:12: error: expected primary-expression before 'long'
   11 |     vector<long long> arr(3 * n);
      |            ^~~~
a.cc:14:16: error: 'arr' was not declared in this scope
   14 |         cin >> arr[i];
      |                ^~~
a.cc:17:10: error: 'arr' was not declared in this scope
   17 |     sort(arr.begin(), arr.end());
      |          ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
long long n;
cin>>n;
long long a[n*3];
for(long long &x:a)cin>>x;
long long sum=0;
for(int i=0;i<(n*3)-1;i+=3){
sort(a+i,a+(i+3));
sum+=a[i+1];
}
cout<<fixed<<setprecision(0)<<sum;
return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:14:10: error: expected '}' at end of input
   14 | return 0;
      |          ^
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 ;
  double a,b;
  cin >> a >> b;
  
 vector<double> x (N);
  vector<double> y (N);
  for(int i=0;i<N;i++){
    cin >> x[i] >> y[i] ;
  }
  
  vector<double> kirokuX(N);
  vector<double> kirokuY(N);
  for(int i=0;i<N;i++){
    kirokuX[i] = x[i] - a;
    kirokuY[i] = y[i] - b;
  }
  
  vector<double> derutaX(N-1);
  vector<double> derutaY(N-1);
  for(int i=0;i<N-1;i++){
    derutaX[i] = x[i] -x[i+1];
    derutaY[i] = y[i] -y[i+1];
  }
  
  vector<double> sokudoX(N-1);
  vector<double> sokudoY(N-1);
  for(int i=0;i<N-1;i++){
    sokudoX[i] = kirokuX[i+1] / 0.05*(i+1) ;
    sokudoY[i] = kirokuY[i+1] / 0.05*(i+1) ;
  }
  for(int i=0;i<N;i++){
    cout << kirokuX[i] << " " << kirokuY[i] << endl;
  }
  cout <<  << endl;
  for(int i=0;i<N-1;i++){
    cout << derutaX[i] << " " << derutaY[i] << endl;
  }
  cout << << endl;
  for(int i=0;i<N-1;i++){
    cout << sokudoX[i] << " " <<sokudoY[i] << endl;
  }
  return 0;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:39:12: error: expected primary-expression before '<<' token
   39 |   cout <<  << endl;
      |            ^~
a.cc:43:11: error: expected primary-expression before '<<' token
   43 |   cout << << endl;
      |           ^~
Language: C++

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

int main(){
	int n;cin>>n;
    vector<long long>v(3*n);
  	for(auto&& w:v)cin>>w;
  sort(begin(v),end(v),greater<long long>());
  long long ans=0ll;
  for(int i=0;i<n;i++){
  ans+=v[2*i+1];
  }
  cout<<ans<<endl;
}

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

#include <iostream>
using namespace std;

int main(){
	int n;cin>>n;
    vector<long long>v(3*n);
  	for(auto&& w:v)cin>>w;
  sort(begin(v),end(v),greater<long long>());
  long long ans=0ll;
  for(int i=0;i<n;i++){
  ans+=v[2*i+1];
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:5: error: 'vector' was not declared in this scope
    6 |     vector<long long>v(3*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:6:12: error: expected primary-expression before 'long'
    6 |     vector<long long>v(3*n);
      |            ^~~~
a.cc:7:22: error: 'v' was not declared in this scope
    7 |         for(auto&& w:v)cin>>w;
      |                      ^
a.cc:8:14: error: 'v' was not declared in this scope
    8 |   sort(begin(v),end(v),greater<long long>());
      |              ^
a.cc:8:3: error: 'sort' was not declared in this scope; did you mean 'short'?
    8 |   sort(begin(v),end(v),greater<long long>());
      |   ^~~~
      |   short
Language: C++

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

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


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

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

// AGC 012 A
int main() {
  int N;
  int a[100000];
  cin >> N;
  for (int i = 0; i < N; i++) cin >> a[i];

  sort(a, a + N, greater<int>());
  int sum = 0;
  for (int i = 0; i < N; i++) {
    if (i % 3 == 1) sum = a[i];
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   17 |   cout << ans << endl;
      |           ^~~
      |           abs
Language: C++

#include <iostream>
#include <algorithm>

using namespace std;

int main(){
    int N;
    int a[3*(10^5)+10];
    cin >> N;
    for(int i = 0; i < (3*N); i++){
        cin >> a[i];
    }

    sort(a, a+(3*N), greater<int>);



//例で考える 1 2 5 5 5 8
//(125), (558); (128), (555)


//1 2 3 4 5 6 90 91 92
//               *     

// 気持ち: 一番大きいのをいつ使うかで場合分け
// hoge hoge maxだとして、

// 要は,a[N]+a[N+2]+ ..... +a[3N-1]

    long long int ans = 0;
/*
    for(int i =0; i< N; i++){
        ans = ans + a[N+(2*i)];
    }
*/
    for(int i = 0; i< N; i++){
        ans = ans +a[2*i];
    }

    cout << ans << endl;
/*
    for(int i = 0; i < 3*N; i++){
        cout << a[i] << endl;
    }
*/
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: warning: result of '10^5' is 15; did you mean '1e5'? [-Wxor-used-as-pow]
    8 |     int a[3*(10^5)+10];
      |                ^
      |              ---
      |              1e
a.cc:8:14: note: you can silence this warning by using a hexadecimal constant (0xa rather than 10)
    8 |     int a[3*(10^5)+10];
      |              ^~
      |              0xa
a.cc:14:34: error: expected primary-expression before ')' token
   14 |     sort(a, a+(3*N), greater<int>);
      |                                  ^
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());
  int ans =0;
  for(int i=0; i <2N ; i++){
    if(i%2 ==0){
      ans += A.at(N+i);
    }
  }
  cout<< ans <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:19: error: unable to find numeric literal operator 'operator""N'
   13 |   for(int i=0; i <2N ; i++){
      |                   ^~
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());
  int ans =0;
  for(int i=0; i < 2*N; i++){
    if(i%2 ==1){
      ans += A.(i);
    }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:16: error: expected unqualified-id before '(' token
   16 |       ans += A.(i);
      |                ^
Language: C++

n=gets.to_i/3
puts gets.split[n,2*n].map(&:to_i).each_cons(2){|x,y| x}.inject(&:+)

Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n=gets.to_i/3
      | ^
a.cc:2:57: error: expected unqualified-id before '.' token
    2 | puts gets.split[n,2*n].map(&:to_i).each_cons(2){|x,y| x}.inject(&:+)
      |                                                         ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'N' was not declared in this scope
    8 |   N = M / 3;
      |   ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'N' was not declared in this scope
    8 |   N = M / 3;
      |   ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected ',' or ';' before 'cin'
    7 |   cin >> M;
      |   ^~~
a.cc:8:3: error: 'N' was not declared in this scope
    8 |   N = M / 3;
      |   ^
Language: C++

10
1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000 1000000000

Compiler output:
a.cc:1:1: error: expected unqualified-id before numeric constant
    1 | 10
      | ^~
Language: Java

import java.util.ArrayList;
import java.util.Collections;
import java.util.Scanner;

public class A012 {

	public static void Main(String[] args) {
		// TODO 自動生成されたメソッド・スタブ

		Scanner scanner = new Scanner(System.in);
		int N = scanner.nextInt();

		ArrayList<Long> list = new ArrayList<>();
		for(int i = 0; i < 3 * N; i++) {
			list.add(scanner.nextLong());
		}

		//どうソートする？
		Collections.sort(list, Collections.reverseOrder());

		long sum = 0;
		for(int i = 0; i < N; i++) {
			sum += list.get(1 + (2 * i));
		}

		System.out.println(sum);
	}

}

Compiler output:
Main.java:5: error: class A012 is public, should be declared in a file named A012.java
public class A012 {
       ^
1 error
Language: C++

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

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

  vector<int> data(3 * N - 1);
  long counter = 0;

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

  sort(str.begin(),str.end());

  for(int i = N;i < 2 * N - 1;i++){
    counter += data[i];
  }

  cout << counter << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:8: error: 'str' was not declared in this scope; did you mean 'std'?
   17 |   sort(str.begin(),str.end());
      |        ^~~
      |        std
Language: C++

#include <iostream>
#include <algorithm>

typedef long long ll;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |   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:14:3: error: 'sort' was not declared in this scope; did you mean 'std::sort'?
   14 |   sort(a,a+k);
      |   ^~~~
      |   std::sort
In file included from /usr/include/c++/14/algorithm:86,
                 from a.cc:2:
/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:19:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |   cout << ans << endl;
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:19:18: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   19 |   cout << ans << endl;
      |                  ^~~~
      |                  std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#inclue <bits/stdc++.h>
using namespace std;
int main(){
long long int n,ans=0;
  cin >> n;
  long long int a[3*n];
  for (int i=0;i<3*n;i++)cin >> a[i];
  sort(a,a+n);
  reverse(a,a+n);
  for (int i=0;i<n;i++)ans+=a[1+2*n];
  cout << ans <<endl;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inclue; did you mean #include?
    1 | #inclue <bits/stdc++.h>
      |  ^~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   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 | #inclue <bits/stdc++.h>
a.cc:8:3: error: 'sort' was not declared in this scope; did you mean 'short'?
    8 |   sort(a,a+n);
      |   ^~~~
      |   short
a.cc:9:3: error: 'reverse' was not declared in this scope
    9 |   reverse(a,a+n);
      |   ^~~~~~~
a.cc:11:3: error: 'cout' was not declared in this scope
   11 |   cout << ans <<endl;
      |   ^~~~
a.cc:11:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:11:17: error: 'endl' was not declared in this scope
   11 |   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 | #inclue <bits/stdc++.h>
Language: C++

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

#define int long long

int main(void) {
  int N;
  int a[100010];
  cin >> 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 = 1; i < 2*N; i += 2) {
    sum += a[i];
    //cout << a[i] << endl;
  }
  cout << sum << endl;
  
  return 0;
}

Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

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

#define MAX 1000000
typedef long long ll;

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

  sort(a, a+N);

  for(int i=0; i<=N; ++i) {}
    sum += a[N*2-2*(i+1)];

  cout << sum << endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:21: error: 'i' was not declared in this scope
   21 |     sum += a[N*2-2*(i+1)];
      |                     ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: expected ';' before '}' token
    9 |     cin >> vec.at(i)}
      |                     ^
      |                     ;
a.cc:14:18: error: expected ';' before '}' token
   14 |     m +=vec.at(i)}
      |                  ^
      |                  ;
Language: C++

#include <iostream>
#include <vector>
 
int main()
{
  int N;
  std::cin >> N;
  std::vector<long long> a(3 * N);
  for (int i = 0; i < 3 * N; i++)
    std::cin >> a[i];
  std::sort(a.begin(), a.end());
  long long ans = 0;
  for (int i = N; i < 3 * N; i += 2)
    ans += a[i];
  std::cout << ans << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:8: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   11 |   std::sort(a.begin(), a.end());
      |        ^~~~
      |        qsort
Language: C++

#include <iostream>
 
int main()
{
  int N;
  std::cin >> N;
  std::vector<long long> a(3 * N);
  for (int i = 0; i < 3 * N; i++)
    std::cin >> a[i];
  std::sort(a.begin(), a.end());
  long long ans = 0;
  for (int i = N; i < 3 * N; i += 2)
    ans += a[i];
  std::cout << ans << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: 'vector' is not a member of 'std'
    7 |   std::vector<long long> a(3 * 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 | 
a.cc:7:15: error: expected primary-expression before 'long'
    7 |   std::vector<long long> a(3 * N);
      |               ^~~~
a.cc:9:17: error: 'a' was not declared in this scope
    9 |     std::cin >> a[i];
      |                 ^
a.cc:10:8: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   10 |   std::sort(a.begin(), a.end());
      |        ^~~~
      |        qsort
a.cc:10:13: error: 'a' was not declared in this scope
   10 |   std::sort(a.begin(), a.end());
      |             ^
Language: C++

#include <iostream>
 
int main()
{
  int N;
  cin >> N;
  std::vector<long long> a(3 * N);
  for (int i = 0; i < 3 * N; i++)
    std::cin >> a[i];
  std::sort(a.begin(), a.end());
  long long ans = 0;
  for (int i = N; i < 3 * N; i += 2)
    ans += a[i];
  std::cout << ans << std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> N;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:8: error: 'vector' is not a member of 'std'
    7 |   std::vector<long long> a(3 * 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 | 
a.cc:7:15: error: expected primary-expression before 'long'
    7 |   std::vector<long long> a(3 * N);
      |               ^~~~
a.cc:9:17: error: 'a' was not declared in this scope
    9 |     std::cin >> a[i];
      |                 ^
a.cc:10:8: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   10 |   std::sort(a.begin(), a.end());
      |        ^~~~
      |        qsort
a.cc:10:13: error: 'a' was not declared in this scope
   10 |   std::sort(a.begin(), a.end());
      |             ^
Language: C++

#include <iostream>

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> N;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:8: error: 'vector' is not a member of 'std'
    7 |   std::vector<ll> a(3 * 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 | 
a.cc:7:15: error: 'll' was not declared in this scope
    7 |   std::vector<ll> a(3 * N);
      |               ^~
a.cc:7:19: error: 'a' was not declared in this scope
    7 |   std::vector<ll> a(3 * N);
      |                   ^
a.cc:10:8: error: 'sort' is not a member of 'std'; did you mean 'qsort'?
   10 |   std::sort(a.begin(), a.end());
      |        ^~~~
      |        qsort
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  long long N;
  cin >> N;
  vector<long long> a(3*N);
  for(int i=1;i<=3*N;i++){cin >> a[i];}
  sort(a.begin(), a.end());
  long long s=0;
  for(long long i=3*N;i>=N+1;i--){
    if(i%2==1){s+=a[i];}
  }
  cout <<

Compiler output:
a.cc: In function 'int main()':
a.cc:14:10: error: expected primary-expression at end of input
   14 |   cout <<
      |          ^
a.cc:14:10: error: expected '}' at end of input
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
int main() {
	int N, A[3*N];
	cin >> N;
	for (int i = 0; i < 3 * N; i++) {
		cin >> A[i];
	}
	sort(A, A + 3 * N);
	long long ans=0;
	for (int i = N; i < 2 * N; i++) {
		ans+=A[i]
	}
	cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:26: error: expected ';' before '}' token
   13 |                 ans+=A[i]
      |                          ^
      |                          ;
   14 |         }
      |         ~
Language: C++

#include<iostream>
#include<aldorithm>
using namespace std;
int main() {
	int N, A[3*N];
	cin >> N;
	for (int i = 0; i < 3 * N; i++) {
		cin >> A[i];
	}
	sort(A, A + 3 * N);
	long long ans=0;
	for (int i = N; i < 2 * N; i++) {
		ans+=A[i]
	}
	cout << ans << endl;
}

Compiler output:
a.cc:2:9: fatal error: aldorithm: No such file or directory
    2 | #include<aldorithm>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C++

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

int N;
int a[1000000000];
int ans = 0;

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


Compiler output:
/tmp/ccNy1eAS.o: in function `main':
a.cc:(.text+0xbe): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccNy1eAS.o
a.cc:(.text+0xc6): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccNy1eAS.o
a.cc:(.text+0xdd): relocation truncated to fit: R_X86_64_PC32 against symbol `ans' defined in .bss section in /tmp/ccNy1eAS.o
collect2: error: ld returned 1 exit status
Language: C++

#include <bits/stdc++.h>

#define pb push_back
#define mp make_pair

#define all(x) (x).begin(), (x).end()

#define fi first
#define se second

using namespace std;

typedef long long ll;

const int MAXN = (int)1e5 + 5;

bool comp(int a, int b){
	return a >= b;
}

void solve() {                   
	ll n;
	ll a[10050000];
	//855521
	cin >> n;
	for(int i=1;i<=3*n;i++){
		cin >> a[i];
	}
	sort(a + 1, a + 3 * n + 1, comp);
	int cnt = n;
	ll res = 0;
	for(int i=2;i<=2 * n;i+=2){
		res += a[i];
		cout << res;
} 	

int main() {    
    int tt = 1;

    while (tt--) {
        solve();
    }

    return 0;
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:37:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   37 | int main() {
      |         ^~
a.cc:37:9: note: remove parentheses to default-initialize a variable
   37 | int main() {
      |         ^~
      |         --
a.cc:37:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:37:12: error: a function-definition is not allowed here before '{' token
   37 | int main() {
      |            ^
a.cc:45:2: error: expected '}' at end of input
   45 | }
      |  ^
a.cc:21:14: note: to match this '{'
   21 | void solve() {
      |              ^
Language: C++

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

typedef long long ll;

ll a[100001];

int main()
{
    ll n;
    scanf("%lld", &n );

    for ( int i = 0; i < n * 3; ++i ) {
        scanf("%lld", &a[i] );
    }

    sort( a.begin(), a.end(), greater<ll>() );

    ll sum = 0;
    for ( int i = 1; i <= n * 2; i += 2 ) {
        sum += a[i];
    }

    printf("%lld\n", sum );

    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:17:13: error: request for member 'begin' in 'a', which is of non-class type 'll [100001]' {aka 'long long int [100001]'}
   17 |     sort( a.begin(), a.end(), greater<ll>() );
      |             ^~~~~
a.cc:17:24: error: request for member 'end' in 'a', which is of non-class type 'll [100001]' {aka 'long long int [100001]'}
   17 |     sort( a.begin(), a.end(), greater<ll>() );
      |                        ^~~
Language: Java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class main {
	public static void main(String[] args) throws Exception{
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		int n = Integer.parseInt(br.readLine());
		ArrayList<Integer> alist = new ArrayList<Integer>();
		long answer = 0;

		for( String str:br.readLine().split(" ") ){
			alist.add(Integer.parseInt(str));
		}
		Collections.sort(alist, Comparator.reverseOrder());

		for(int i=0;i<n;i++){
			int num = (2*i)+1;
			answer += alist.get(num);
		}

		System.out.println(answer);
	}
}


Compiler output:
Main.java:7: error: class main is public, should be declared in a file named main.java
public class main {
       ^
1 error
Language: C++

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

int N;
int main(){
	cin >> N;
	vector<long long> v(3*N);
	for(int i=0;i<3*N;i++){
		cin >> v[i];
	}
	sort(v.begin(),v.end());
	long long ans = 0;
	int count = 0,r = 3*N-1;
	while(count<N){
		ans += v[r-1];
		r -= 2;
		count++;
	}
	cout << ans << endl;
}

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

#include<bits/stdc++.h>
using namespace std;
#define ll long long
ll sum = 0;
ll a[3 * 123456];
bool cmd(ll x, ll y)
{
	return x > y;
}
int n;
inline void _read(int &x)
{
	x = 0;
	char t = getchar();
	while (!isdigit(t)) t = getchar();
	while (isdigit(t))
	{
		x = x * 10 + t - '0';
		t = getchar();
	}
}
int main()
{
	_read(n);
	for (int i = 1; i <= 3 * n; i++) _read(a[i]);
	int i = 2;
	sort(a + 1, a + 1 + 3 * n, cmd);
	while (n--)
	{
		sum += a[i];
		i += 2;
	}
	printf("%lld", sum);
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:51: error: cannot bind non-const lvalue reference of type 'int&' to a value of type 'long long int'
   25 |         for (int i = 1; i <= 3 * n; i++) _read(a[i]);
      |                                                ~~~^
a.cc:11:24: note:   initializing argument 1 of 'void _read(int&)'
   11 | inline void _read(int &x)
      |                   ~~~~~^
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define fi first
#define sec second
#define rep(i,a,n) for(int i=a;i<n;i++)
#define per(i,a,n) for(int i=n-1;i>=a;i--)
#define pb push_back
#define pii pair<int,int>
#define sit set<int>:: iterator
#define IOS ios_base::sync_with_stdio(false),cin.tie(0),cout.tie(0)
using namespace std;
const int MAXLOG=60;

ll pw[MAXLOG];
int main(){
    int n;
    cin>>n;
    pw[0]=1;
    rep(i,1,MAXLOG)
        pw[i]=pw[i-1]*2;

    int cnt=1;
    per(i,0,MAXLOG)
        if(pw[i]<=n){
            rep(j,0,i+1)
                V.pb(cnt);
            cnt++;
            n-=pw[i];
        }
    cout<<V.size()<<endl;
    for(auto tmp:V)
        cout<<tmp<<' ';

    cout<<endl;
    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:17: error: 'V' was not declared in this scope
   26 |                 V.pb(cnt);
      |                 ^
a.cc:30:11: error: 'V' was not declared in this scope
   30 |     cout<<V.size()<<endl;
      |           ^
Language: C++

#include <iostream>
using namespace std;

int main() {
    int32_t n;
    cin >> n;
    int32_t a[3 * n];
    
    for (int32_t i = 0; i < 3 * n; i++) {
        cin >> a[i];
    }
    sort(a, a + 3 * n);

    int64_t answer = 0;
    for (int32_t i = 1; i <= n; i++) {
        answer += a[3 * n - 2 * i];
    }
    cout << answer << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |     sort(a, a + 3 * n);
      |     ^~~~
      |     short
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
#include <map>
#include <cmath>
#include <queue>
using namespace std;
#define FOR(i,a,b) for(int (i)=(a);(i)<=(b);(i)++)
#define FFOR(i,a,b) for(int (i)=(a);(i)>=(b);(i)--)
#define rep(i,n) FOR(i,0,n-1)
#define int long long
#define MOD 998244353
#define MAXN  100005
#define P pair<int,int>

int a[MAXN];

signed main(){
	
	int n;cin >>n;
	
	int ans = 0;
	int cnt = 0;
	int pret = 0;
	
	rep(i,n) cin>>a[i];
	sort(a,a+n);
	reverse(a,a+n);
	
	rep(i,n) ans += a[1+2*i]
	
	
	
	cout << ans << endl;
		
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:33: error: expected ';' before 'cout'
   31 |         rep(i,n) ans += a[1+2*i]
      |                                 ^
      |                                 ;
......
   35 |         cout << ans << endl;
      |         ~~~~
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<int> a(3*n);
  for(int i=0;i<3*n;i++) cin >> a[i];
  sort(a.begin(),b.begin());
  cout << a[n] << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:18: error: 'b' was not declared in this scope
   11 |   sort(a.begin(),b.begin());
      |                  ^