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

#include<bits\stdc++.h>
using namespace std;
typedef long long ll;
const int Max=1e5+5;
const int Mod=1e9+7;
int lst[Max];

int main()
{
	int n;
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		scanf("%d",&lst[i]);
		reverse(lst+1,lst+i+1);
	}
	for(int i=1;i<=n;i++)
	{
		printf("%d ",lst[i]);
	}
	
}

Compiler output:
a.cc:1:9: fatal error: bits\stdc++.h: No such file or directory
    1 | #include<bits\stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <deque>
#include <string>

using namespace std;

typedef false LEFT;
typedef true RIGHT;

int main()	{
  long long n;
  cin >> n;
  long long a[n] = {0};
  for (int i = 0; i < n; i++)	{
    cin >> a[i];
  }
  deque<long long> b;
  bool insert;
  if (n % 2 == 0)	{
    //start insert from left
    insert = LEFT;
  }
  else {
    insert = RIGHT;
  }
  b.push_back(a[0]);
  for (long long i = 1; i < n; i++)	{
    if (insert == RIGHT)	{
      b.push_back(a[i]);
    }
    else	{
      b.push_front(a[i]);
    }
    insert = !insert;
  }
  for (long long i = 0; i < n; i++)	{
    cout << b[i];
  }
  return 0;
}

Compiler output:
a.cc:7:9: error: expected unqualified-id before 'false'
    7 | typedef false LEFT;
      |         ^~~~~
a.cc:8:9: error: expected unqualified-id before 'true'
    8 | typedef true RIGHT;
      |         ^~~~
a.cc: In function 'int main()':
a.cc:21:14: error: 'LEFT' was not declared in this scope
   21 |     insert = LEFT;
      |              ^~~~
a.cc:24:14: error: 'RIGHT' was not declared in this scope
   24 |     insert = RIGHT;
      |              ^~~~~
a.cc:28:19: error: 'RIGHT' was not declared in this scope
   28 |     if (insert == RIGHT)        {
      |                   ^~~~~
Language: C++

n = int(input())
a = list(map(int, input().split()))

pushpush = []
for i in range(n):
    if (i%2 == (n-1)%2):
        pushpush.insert(0, a[i])
    else:
        pushpush.append(a[i])

print(*pushpush)

Compiler output:
a.cc:1:1: error: 'n' does not name a type
    1 | n = int(input())
      | ^
Language: Java

import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception{
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		String[] a = new String[n];
		for(int i=0; i<a.length; i++){
			a[i] = scn.next();
		}
      	ArrayList<String> list = new ArrayList<>();
      	for(int i=0; i<a.length; i++){
          list.add(a[i]);
          Collection.reverse(list);
        }
      	for(int i=0; i<list.size(); i++){
          String ans = list.get(i);
          System.out.print(ans + " ");
        }
	}
}


Compiler output:
Main.java:14: error: cannot find symbol
          Collection.reverse(list);
                    ^
  symbol:   method reverse(ArrayList<String>)
  location: interface Collection
1 error
Language: Java

import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception{
		Scanner scn = new Scanner(System.in);
		int n = scn.nextInt();
		String[] a = new String[n];
		for(int i=0; i<a.length; i++){
			a[i] = scn.next();
		}
      	ArrayList<string> list = new ArrayList<>();
      	for(int i=0; i<a.length; i++){
          list.add(a[i]);
          Collection.reverse(list);
        }
      	for(int i=0; i<list.size(); i++){
          String ans = list.get(i);
          System.out.print(ans + " ");
        }
	}
}

Compiler output:
Main.java:11: error: cannot find symbol
      	ArrayList<string> list = new ArrayList<>();
      	          ^
  symbol:   class string
  location: class Main
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, c) for (int i = 0; i < (int)c; i++)
int main() {
    int n;
    scanf("%d", &n);
    vector<ll> a(n);
    rep(i, n) scanf("%lld", &a[i]);
    deque<ll> ans;
    int temp = 1;
    if(n % 2) temp = 0; //nが奇数なら0、偶数なら1
    rep(i, n) {
        if(i % 2 == temp) ans.push_front(a[i]); //偶奇が一致してたら
        else ans.push_back(a[i]);
    }
    rep(i, n) printf("%lld ", ans[i]);
    printf("\n");
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:12: error: 'll' was not declared in this scope
    7 |     vector<ll> a(n);
      |            ^~
a.cc:7:14: error: template argument 1 is invalid
    7 |     vector<ll> a(n);
      |              ^
a.cc:7:14: error: template argument 2 is invalid
a.cc:8:31: error: invalid types 'int[int]' for array subscript
    8 |     rep(i, n) scanf("%lld", &a[i]);
      |                               ^
a.cc:9:13: error: template argument 2 is invalid
    9 |     deque<ll> ans;
      |             ^
a.cc:13:31: error: request for member 'push_front' in 'ans', which is of non-class type 'int'
   13 |         if(i % 2 == temp) ans.push_front(a[i]); //偶奇が一致してたら
      |                               ^~~~~~~~~~
a.cc:13:43: error: invalid types 'int[int]' for array subscript
   13 |         if(i % 2 == temp) ans.push_front(a[i]); //偶奇が一致してたら
      |                                           ^
a.cc:14:18: error: request for member 'push_back' in 'ans', which is of non-class type 'int'
   14 |         else ans.push_back(a[i]);
      |                  ^~~~~~~~~
a.cc:14:29: error: invalid types 'int[int]' for array subscript
   14 |         else ans.push_back(a[i]);
      |                             ^
a.cc:16:34: error: invalid types 'int[int]' for array subscript
   16 |     rep(i, n) printf("%lld ", ans[i]);
      |                                  ^
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#define ALL(a)    a.begin(), a.end() 
#define rep(i, K, N)  for(int i = K; i < N; i++)
#define ll long long int
using namespace std;

int main() {
ll N, A;cin >> N;
vector<ll> B;

rep(i, 0, N){

cin >> A;

if(i%2 == 0)B.push_back(A);

else B.insert(B.begin(), A);
}

if(N%2 != 0)reverse(ALL(B)):

rep(i, 0, B.size())cout << B[i] << " ";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:28: error: expected ';' before ':' token
   21 | if(N%2 != 0)reverse(ALL(B)):
      |                            ^
      |                            ;
a.cc:23:5: error: 'i' was not declared in this scope
   23 | rep(i, 0, B.size())cout << B[i] << " ";
      |     ^
a.cc:4:38: note: in definition of macro 'rep'
    4 | #define rep(i, K, N)  for(int i = K; i < N; i++)
      |                                      ^
Language: C++

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

int main(){
  int n;
  cin>>n;
  veector<int> vec (n);
  for(int i=0;i<n;++i) cin>>vec[i];
  vector<int> kara(0);
  for(int i=0;i<n;++i){
    kara.push_back(vec[i]);
    reverse(kara.begin(),kara.end());
  }
  for(int i=0;i<n;++i){
    cout<<kara[i];
    if(i+1==0) break;
    cout<<" ";
  }
  cout<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'veector' was not declared in this scope
    7 |   veector<int> vec (n);
      |   ^~~~~~~
a.cc:7:11: error: expected primary-expression before 'int'
    7 |   veector<int> vec (n);
      |           ^~~
a.cc:8:29: error: 'vec' was not declared in this scope
    8 |   for(int i=0;i<n;++i) cin>>vec[i];
      |                             ^~~
a.cc:11:20: error: 'vec' was not declared in this scope
   11 |     kara.push_back(vec[i]);
      |                    ^~~
Language: C++

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

int main(){
  int n;
  cin>>n;
  veector<int> vec (n);
  for(int i=0;i<n;++i) cin>>vec[i];
  vector<int> kara(0);
  for(int i=0;i<n;++i){
    kara.push_back(vec[i]);
    reverse(kara.begin(),kara.end());
  }
  for(int i=0;i<n;++i){
    cout<<kara[i];
    if(i+1==0) break;
    cout<<" ";
  }
  cout<<endl;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #intclude; did you mean #include?
    1 | #intclude <bits/stdc++.h>
      |  ^~~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   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 | #intclude <bits/stdc++.h>
a.cc:7:3: error: 'veector' was not declared in this scope
    7 |   veector<int> vec (n);
      |   ^~~~~~~
a.cc:7:11: error: expected primary-expression before 'int'
    7 |   veector<int> vec (n);
      |           ^~~
a.cc:8:29: error: 'vec' was not declared in this scope
    8 |   for(int i=0;i<n;++i) cin>>vec[i];
      |                             ^~~
a.cc:9:3: error: 'vector' was not declared in this scope
    9 |   vector<int> kara(0);
      |   ^~~~~~
a.cc:1:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
  +++ |+#include <vector>
    1 | #intclude <bits/stdc++.h>
a.cc:9:10: error: expected primary-expression before 'int'
    9 |   vector<int> kara(0);
      |          ^~~
a.cc:11:5: error: 'kara' was not declared in this scope
   11 |     kara.push_back(vec[i]);
      |     ^~~~
a.cc:11:20: error: 'vec' was not declared in this scope
   11 |     kara.push_back(vec[i]);
      |                    ^~~
a.cc:12:5: error: 'reverse' was not declared in this scope
   12 |     reverse(kara.begin(),kara.end());
      |     ^~~~~~~
a.cc:15:5: error: 'cout' was not declared in this scope
   15 |     cout<<kara[i];
      |     ^~~~
a.cc:15:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:15:11: error: 'kara' was not declared in this scope
   15 |     cout<<kara[i];
      |           ^~~~
a.cc:19:3: error: 'cout' was not declared in this scope
   19 |   cout<<endl;
      |   ^~~~
a.cc:19:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:19:9: error: 'endl' was not declared in this scope
   19 |   cout<<endl;
      |         ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | #intclude <bits/stdc++.h>
Language: Java

import java.io.*;
import java.math.*;
import java.util.*;
public class PushPush { 
 
	public static void main(String[] args) { //Ball out dawg
		FastScanner I = new FastScanner(); //Input
		OutPut O = new OutPut(); //Output
		int N  =I.nextInt();
		long[] a = new long[N];
		for (int i = 0; i < N; i++) a[i]  =I.nextLong();
		int ptr = N-1;
		while (ptr>=0) {
			O.p(a[ptr]+" ");
			ptr-=2;
		}
		ptr=N%2;
		while (ptr<N) {
			O.p(a[ptr]+" ");
			ptr+=2;
		}
	}
	public static long ceil(long num, long den) {long ans = num/den; if (num%den!=0) 
	ans++; return ans;}
	public static long GCD(long a, long b) {
		if (a==0||b==0) return Math.max(a,b);
		return GCD(Math.min(a, b),Math.max(a, b)%Math.min(a, b));
	}
	public static long FastExp(long base, long exp, long mod) {
		long ans=1;
		while (exp>0) {
			if (exp%2==1) ans*=base;
			exp/=2;
			base*=base;
			base%=mod;
			ans%=mod;
		}
		return ans;
	}
	public static long ModInv(long num,long mod) {return FastExp(num,mod-2,mod);}
	static class FastScanner {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st=new StringTokenizer("");
		String next() {
			while (!st.hasMoreTokens())
				try {
					st=new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			return st.nextToken();
		}
		int nextInt() {return Integer.parseInt(next());}
		long nextLong() {return Long.parseLong(next());};
	}
	static class OutPut{
		PrintWriter w = new PrintWriter(System.out);
		void pln(int x) {w.println(x);w.flush();}
		void pln(long x) {w.println(x);w.flush();}
		void pln(String x) {w.println(x);w.flush();}
		void pln(char x) {w.println(x);w.flush();}
		void pln(StringBuilder x) {w.println(x);w.flush();}
		void p(int x) {w.print(x);w.flush();}
		void p(long x) {w.print(x);w.flush();}
		void p(String x) {w.print(x);w.flush();}
		void p(char x) {w.print(x);w.flush();}
		void p(StringBuilder x) {w.print(x);w.flush();}
	}
}

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

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

int main() {
  long long n;
  cin >> n;
  vector<long long> res;
  for (long long i=0;i<n;i++) {
    long long a;
    cin >> a;
    res.push_back(a);
    sort(res.end(), res.begin());
  }
  for (long long i=0;i<n-1;i++) {
    cout << res[i] << " ";
  }
  cout << res[n-1

Compiler output:
a.cc: In function 'int main()':
a.cc:20:18: error: expected ']' at end of input
   20 |   cout << res[n-1
      |                  ^
      |                  ]
a.cc:20:18: error: expected ';' at end of input
   20 |   cout << res[n-1
      |                  ^
      |                  ;
a.cc:20:18: error: expected '}' at end of input
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
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(){
  int n; cin>>n;
  string b;
  if(n==1){
    int a; cin>>a;
    cout<<a;
    return 0;
  }
  rep(i,n){
    string a; cin>>a;
    b+=a;
    reverse(b.begin(),b.end());
  }
  rep(i,n){
    cout<<b[i]<<" ";
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:21:4: error: expected '}' at end of input
   21 |   }
      |    ^
a.cc:6:11: note: to match this '{'
    6 | int main(){
      |           ^
Language: Java

import java.util.Scanner;
public class Main {
	public static void main(String[] args){
		Scanner scan = new Scanner(System.in);
		int n = Integer.parseInt(scan.next());
     	List<int> b = new ArrayList<int>();
      int a
      
      	for(int i = 0; i < n; i++){
          a = Integer.parseInt(scan.next());
          if(a % 2 == 0){
            list.add(a);
          }else{
            list.add(0, a);
          }
        }
      if(n % 2 == 0){
        for(int i = 0; i<n; i++){
          System.out.println(b.get(i));
        }
      }else{
        for(int i = 0; i < n; i ++){
          System.out.println(b.get(n - i - 1));
        }
      }
    }
}

Compiler output:
Main.java:7: error: ';' expected
      int a
           ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, srt, end) for (long long i = (srt); i < (long long)(end); i++)
#define VL vector<ll>
#define INF 100000000
typedef long long ll;

int main() {
  int n;
  cin>>n;
  vector<int>q;
  for(int i=0;i<n;i++){
    int a;
    cin>>a;
    if(i%2==0){
      q.push_back(a);
    }else{
      q.push_front(a);
    }
  }
  if(n%2==1)reverse(q.begin(),q.end());
  for(int i=0;i<n;i++){
    if(i==n-1)cout<<q[i]<<endl;
    else cout<<q[i]<<" ";
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:9: error: 'class std::vector<int>' has no member named 'push_front'
   18 |       q.push_front(a);
      |         ^~~~~~~~~~
Language: C

#include <bits/stdc++.h>
using ll = long long;
using namespace std;
#define rep(i,n) for(int i=0, i##_len=(int)(n); i<i##_len; i++)
#define reps(i,n) for(int i=1 , i##_len=(int)(n);i<=i##_len;i++)
#define rrep(i,n) for(int i=((int)(n)-1);i>=0;i--)
#define rreps(i,n) for(int i=((int)(n));i>0;i--)
#define repi(i,x) for(auto i=(x).begin(),i##_fin=(x).end();i!=i##_fin;i++)
#define all(x) (x).begin(), (x).end()
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define solve(a) ((a)?"Yes":"No")
typedef vector<int> Vi;
typedef vector<Vi> VVi;
typedef pair<int , int> Pi;
typedef vector<Pi> VPi;
typedef vector<long long> V;
typedef vector<V> VV;
typedef pair<long long , long long> P;
typedef vector<P> VP;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1;} return 0;}
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1;} return 0;}
const long long INFLL = 1LL<<60;
const int INF = 1<<30;
const double PI=acos(-1);
int main(){
	int n;
	int ans=0;
	cin >>n;
	int a;
	deque<int>data;
	rep(i,n){
		cin>>a;
		if(i%2==0){
			data.push_back(a);
		}else{
			data.push_front(a);
		}
	}
	while(!data.empty()){
		if(n%2==0){
			a=data.front();	
			data.pop_front();
		}else{
			a=data.back();
			data.pop_back();
		}

		cout<<a;
		if(data.empty()){
			cout<<endl;
		}else{
			cout<<" ";
		}
	}
}

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

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

#define rep(i, a, b) for(int i = (a); i < (b); ++i)
#define all(x) begin(x), end(x)
typedef long long ll;
typedef pair<int, int> pii;
const int inf=1010001000;
const ll  INF=1001000100010001000;
const int mod=(int)1e9+7;

int main(){
    int n;
    cin>>n;
    vector<int>a(n);
    deque<int> b;
    rep(i,0,n){
        cin>>a.at(i);
    }
    rep(i,0,n){
        if(i%2==0)b.push_front;
        else b.push_back(a.at(i));
    }
    if(n%2==0)reverse(all(b));
    rep(i,0,n){
        cout<<b.at(i)<<' ';
    }
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:21: error: statement cannot resolve address of overloaded function
   21 |         if(i%2==0)b.push_front;
      |                   ~~^~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  list<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      A.push_front(a);
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for_each(A.cbegin(), A.cend(), [](long long x){
    cout << x << " ";
  })
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:5: error: expected ';' before '}' token
   22 |   })
      |     ^
      |     ;
   23 | }
      | ~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  list<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      A.push_front(a);
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for_each(ls.cbegin(), ls.cend(), [](long long x){
    cout << x << " ";
  })
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:12: error: 'ls' was not declared in this scope
   20 |   for_each(ls.cbegin(), ls.cend(), [](long long x){
      |            ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  list<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      A.push_front(a);
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for(int i=0;i<N;i++){
    cout<<A[i]<<" ";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:12: error: no match for 'operator[]' (operand types are 'std::__cxx11::list<long long int>' and 'int')
   21 |     cout<<A[i]<<" ";
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  list<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      A.push_front(a);
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for(int i=0;i<N;i++){
    cout<<A.at(i)<<" ";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:21:13: error: 'class std::__cxx11::list<long long int>' has no member named 'at'
   21 |     cout<<A.at(i)<<" ";
      |             ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  vector<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      auto it;
      it = A.begin();    
      it = A.insert(it,a); 
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for(int i=0;i<N;i++){
    cout<<A.at(i)<<" ";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:7: error: declaration of 'auto it' has no initializer
   14 |       auto it;
      |       ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long N;
  cin>>N;
  vector<long long>A;
  for(int i=0;i<N;i++){
    long long a;
    cin>>a;
    if(i%2==0){
      A.push_back(a);
    }
    else{
      it = A.begin();    
      it = A.insert(it,a); 
    }
  }
  if(N%2==1){
    reverse(A.begin(),A.end());
  }
  for(int i=0;i<N;i++){
    cout<<A.at(i)<<" ";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:7: error: 'it' was not declared in this scope; did you mean 'i'?
   14 |       it = A.begin();
      |       ^~
      |       i
Language: C++

#define rep(i, n) for(int i=0; i<n; ++i)
using namespace std;
using ll = int64_t;
using vi = vector<int>;
using vvi = vector<vi>;


int main() {
    int n;
    cin >> n;
    vi a(n);
    rep(i, n) {
        cin >> a[i];
    }

    vi b;
    rep(i, n) {
        if(i+1 <= (n+1)/2) {
            b.push_back(a[n-2*i-1]);
        } else {
            b.push_back(a[n-2*(n-i)]);
        }
    }

    rep(i, n-1) {
        cout << b[i] << ' ';
    }
    cout << b[n-1] << '\n';
}

Compiler output:
a.cc:3:12: error: 'int64_t' does not name a type
    3 | using ll = int64_t;
      |            ^~~~~~~
a.cc:1:1: note: 'int64_t' is defined in header '<cstdint>'; this is probably fixable by adding '#include <cstdint>'
  +++ |+#include <cstdint>
    1 | #define rep(i, n) for(int i=0; i<n; ++i)
a.cc:4:12: error: 'vector' does not name a type
    4 | using vi = vector<int>;
      |            ^~~~~~
a.cc:5:13: error: 'vector' does not name a type
    5 | using vvi = vector<vi>;
      |             ^~~~~~
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 | #define rep(i, n) for(int i=0; i<n; ++i)
a.cc:11:5: error: 'vi' was not declared in this scope
   11 |     vi a(n);
      |     ^~
a.cc:13:16: error: 'a' was not declared in this scope
   13 |         cin >> a[i];
      |                ^
a.cc:16:7: error: expected ';' before 'b'
   16 |     vi b;
      |       ^~
      |       ;
a.cc:19:13: error: 'b' was not declared in this scope
   19 |             b.push_back(a[n-2*i-1]);
      |             ^
a.cc:19:25: error: 'a' was not declared in this scope
   19 |             b.push_back(a[n-2*i-1]);
      |                         ^
a.cc:21:13: error: 'b' was not declared in this scope
   21 |             b.push_back(a[n-2*(n-i)]);
      |             ^
a.cc:21:25: error: 'a' was not declared in this scope
   21 |             b.push_back(a[n-2*(n-i)]);
      |                         ^
a.cc:26:9: error: 'cout' was not declared in this scope
   26 |         cout << b[i] << ' ';
      |         ^~~~
a.cc:26:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:26:17: error: 'b' was not declared in this scope
   26 |         cout << b[i] << ' ';
      |                 ^
a.cc:28:5: error: 'cout' was not declared in this scope
   28 |     cout << b[n-1] << '\n';
      |     ^~~~
a.cc:28:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:28:13: error: 'b' was not declared in this scope
   28 |     cout << b[n-1] << '\n';
      |             ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int n;
  cin >> n;
  int a[n];
  for(int i=0;i<n;i++){
    cin >> a[i];
  }
  if(i%2==0){
    for(int i=n-1;i>0;i=i-2){
      cout << a[i] << ' ';
    }
    for(int i=0;i<n;i=i+2){
      cout << a[i] << ' ';
    }
  }
  else{
    for(int i=n-1;i>0;i=i-2){
      cout << a[i] << ' ';
    }
    for(int i=1;i<n;i=i+2){
      cout << a[i] << ' ';
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:6: error: 'i' was not declared in this scope
   10 |   if(i%2==0){
      |      ^
Language: C++

#include <bits/stdc++.h>
#include<chrono>
using namespace std;
using ll = long long;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define rep2(i, s, n) for (int i = (s); i < (int)(n); i++)

int main() {
    int n;
    cin >> n;
    deque<ll> A;
    if (n % 2 == 0) {
        rep(i, n/2) {
            ll a1, a2; 
            cin >> a1 >> a2;
            A.push_back(a1);
            A.pop_front(a2);
        }
    }
    else {
        ll a;
        cin >> a;
        A.push_front(a);
        rep(i, (n-1)/2) {
            ll a2, a3;
            cin >> a2 >> a3;
            A.push_back(a2);
            A.push_front(a3);
        }
    }
    rep(i, n) {
        if (i == n-1) {
            cout << A[i] << endl;
            return 0;
        }
        cout << A[i] << " ";
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:24: error: no matching function for call to 'std::deque<long long int>::pop_front(ll&)'
   17 |             A.pop_front(a2);
      |             ~~~~~~~~~~~^~~~
In file included from /usr/include/c++/14/deque:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:139,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_deque.h:1574:7: note: candidate: 'void std::deque<_Tp, _Alloc>::pop_front() [with _Tp = long long int; _Alloc = std::allocator<long long int>]'
 1574 |       pop_front() _GLIBCXX_NOEXCEPT
      |       ^~~~~~~~~
/usr/include/c++/14/bits/stl_deque.h:1574:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<long long> a;
  vector<long long> b;
  
  for (int i=1;i<=n;++i){
    int n;
    cin >> n;
    b.push_back(a);
    sort(b.begin(),b.end());
    cout << b[i] << endl;
  }
}
    


Compiler output:
a.cc: In function 'int main()':
a.cc:13:16: error: no matching function for call to 'std::vector<long long int>::push_back(std::vector<long long int>&)'
   13 |     b.push_back(a);
      |     ~~~~~~~~~~~^~~
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:1283:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; value_type = long long int]'
 1283 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1283:35: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'const std::vector<long long int>::value_type&' {aka 'const long long int&'}
 1283 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1300:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(value_type&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; value_type = long long int]'
 1300 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1300:30: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'std::vector<long long int>::value_type&&' {aka 'long long int&&'}
 1300 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~
Language: C++

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

int main(){
  int n;
  cin >> n;
  vector<long long> a(n);
  for (int i=1;i<=n;++i) cin >> a[i];
  vector<long long> b(n);
  
  for (int i=1;i<=n;++i){
    b.push_back(a);
    sort(b.begin(),b.end());
    cout << b[i] << endl;
  }
}
    


Compiler output:
a.cc: In function 'int main()':
a.cc:12:16: error: no matching function for call to 'std::vector<long long int>::push_back(std::vector<long long int>&)'
   12 |     b.push_back(a);
      |     ~~~~~~~~~~~^~~
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:1283:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; value_type = long long int]'
 1283 |       push_back(const value_type& __x)
      |       ^~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1283:35: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'const std::vector<long long int>::value_type&' {aka 'const long long int&'}
 1283 |       push_back(const value_type& __x)
      |                 ~~~~~~~~~~~~~~~~~~^~~
/usr/include/c++/14/bits/stl_vector.h:1300:7: note: candidate: 'void std::vector<_Tp, _Alloc>::push_back(value_type&&) [with _Tp = long long int; _Alloc = std::allocator<long long int>; value_type = long long int]'
 1300 |       push_back(value_type&& __x)
      |       ^~~~~~~~~
/usr/include/c++/14/bits/stl_vector.h:1300:30: note:   no known conversion for argument 1 from 'std::vector<long long int>' to 'std::vector<long long int>::value_type&&' {aka 'long long int&&'}
 1300 |       push_back(value_type&& __x)
      |                 ~~~~~~~~~~~~~^~~
Language: C++

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

int main(){
  int n; scanf("%d", &n);
  deque<int> d;
  rep(i, n){
    int a; scanf("%d", &a);
    if(i & 1) d.push_front(a);
    else d.push_back(a);
  }
  if(n & 1){
    rep(i, n){
      printf("%d", d.front());
      d.pop_front();
      if(i < n-1) printf(" ");
    }
  }
  else{
    rep(i, n){
      printf("%d", d.back());
      d.pop_back();
      if(i < n-1) printf(" ");
    }
  }
  printf("\n")
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:15: error: expected ';' before 'return'
   27 |   printf("\n")
      |               ^
      |               ;
   28 |   return 0;
      |   ~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
   int N;
  cin>>N;
  vector<int>A(N);
  for(int i=0;i<N;i++)
    cin>>A.at(i);
  vector<int>B(N);
  for(int i=0;i<N){
  if(i<=(N-1)/2){
  B.at(i)=A.at(N-1-2*i);
  }else{
  B.at(i)=A.at((N%2)+2*(i-(N+1)/2));
  }
  }for(int i=0;i<N;i++)
    cout<<B.at(i)<<" ";
  cout<<B.at(N-1)<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:18: error: expected ';' before ')' token
   10 |   for(int i=0;i<N){
      |                  ^
      |                  ;
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<deque>
#include<math.h>
using namespace std;
#define ll long long
int main(){
    ll n,a;
    cin >> n;
    ll i;
    for(i=0;i<n;i++){
        cin >> a[i];
    }
    for(i=0;i<=n/2;i++){
        cout << a[n-1-2*i] << " ";
    }
    for(i=0;i<n/2;i++){
        cout << a[n%2+2*i] << " ";
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:17: error: invalid types 'long long int[long long int]' for array subscript
   19 |         cin >> a[i];
      |                 ^
a.cc:22:18: error: invalid types 'long long int[long long int]' for array subscript
   22 |         cout << a[n-1-2*i] << " ";
      |                  ^
a.cc:25:18: error: invalid types 'long long int[long long int]' for array subscript
   25 |         cout << a[n%2+2*i] << " ";
      |                  ^
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<deque>
#include<math.h>
using namespace std;
#define ll long long
int main(){
    ll n,a;
    ll i;
    for(i=0;i<n;i++){
        cin >> a[i];
    }
    for(i=0;i<=n/2;i++){
        cout << a[n-1-2*i];
    }
    for(i=0;i<n/2;i++){
        cout << a[n%2+2*i];
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:17: error: invalid types 'long long int[long long int]' for array subscript
   18 |         cin >> a[i];
      |                 ^
a.cc:21:18: error: invalid types 'long long int[long long int]' for array subscript
   21 |         cout << a[n-1-2*i];
      |                  ^
a.cc:24:18: error: invalid types 'long long int[long long int]' for array subscript
   24 |         cout << a[n%2+2*i];
      |                  ^
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<list>
#include<map>
#include<deque>
#include<math.h>
using namespace std;
#define ll long long
int main(){
    ll n,a;
    for(i=0;i<n;i++){
        cin >> a[i];
    }
    for(i=0;i<=n/2;i++){
        cout << a[n-1-2*i];
    }
    for(i=0;i<n/2;i++){
        cout << a[n%2+2*i];
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: 'i' was not declared in this scope
   16 |     for(i=0;i<n;i++){
      |         ^
a.cc:19:9: error: 'i' was not declared in this scope
   19 |     for(i=0;i<=n/2;i++){
      |         ^
a.cc:22:9: error: 'i' was not declared in this scope
   22 |     for(i=0;i<n/2;i++){
      |         ^
Language: C++

import numpy as np
n = int(input())
a = [int(i) for i in input().split()]

begin = a[0::2]
end =a[1::0]

if n%2 == 0:
    end = end[:-1]
    ans = np.concatenate(end,begin)
else:
    begin = begin[::-1]
    ans = np.concatenate(begin,end)
    
print(ans)
    

Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import numpy as np
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++

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

signed main(void)
{
	long long n;
	cin >> n;
	long long a[n];
	deque<long long> dq;
	bool ok;
	rep(i, n) cin >> a[i];
	ok = false;

	rep(i, n)
	{
		ok ^= 1;
		if (i % 2 == 0)
			dq.push_back(a[i]);
		else
			dq.push_front(a[i]);
	}
	if (ok)
		reverse(dq.begin(), dq.end());
	while(!dq.empty())
	{
		prlong longf("%d ", dq.front());
		dq.pop_front();
	}
	cout << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:17: error: 'prlong' was not declared in this scope; did you mean 'ulong'?
   27 |                 prlong longf("%d ", dq.front());
      |                 ^~~~~~
      |                 ulong
Language: C++

#include<bits/stdc++.h>
#define rep(i,n)for(int i=0;i<n;++i)
#include<string>
#include<vector>
using namespace std;
typedef long long ll;
typedef pair<int, int>P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
//max=({});
//条件式が真ならwhileの中身を回し続ける
//printf("%d\n", ans);

//pairの入力
//vector<pair<ll, ll>>work(n);
//rep(i, n) {
//	ll a, b;
//	cin >> a >> b;
//	work[i] = make_pair(a, b);
//for(auto p:mp)(mapの探索)
//printf("%.10f\n",なんちゃら)

int g[15][15];
const int INF = 1001001001;
const int dx[4] = { -1,0,1,0 };
const int dy[4] = { 0,-1,0,1 };

//最大公約数
ll gcd(ll x, ll y) {
	return y ? gcd(y, x % y) : x;
}

ll lcm(ll x, ll y) {
	if (x == 0 || y == 0)return 0;
	return (x / gcd(x, y) * y);
}

//素因数分解
vector<pair<ll, int>>factorize(ll n) {
	vector<pair<ll, int>>res;
	for (ll i = 2;i * i <= n;++i) {
		if (n % i)continue;
		res.emplace_back(i, 0);
		while (n % i == 0) {
			n /= i;
			res.back().second++;
		}
	}
	if (n != 1)res.emplace_back(n, 1);
	return res;
}

int bingo[3][3];
bool flag[3][3];
int cnt[2][105];
int h, w;
int choco[1010][1010];
int s[11][11];

int main() {
	int n;
	cin >> n;
	vector<int>a(n);
	deque<int>deq;
	rep(i, n) {
		cin >> a[i];
	}
	rep(i, n) {
		if (i % 2 == 0)deq.push_back(a[i]);
		else deq.push_front(a[i]);
	}
	if (n % 2 != 0) {
		for (i = n - 1;i >= 0;--i) {
			cout << deq[i] << endl;
		}
	}
	else {
		rep(i, n) {
			cout << deq[i] << endl;
		}
	}
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:73:22: error: 'i' was not declared in this scope
   73 |                 for (i = n - 1;i >= 0;--i) {
      |                      ^
Language: C++

#include<iostream>
#include<algorithm>
#include<string>
#include<vector>
#include<stack>
#include<queue>
#include<map>
#include<set>
#include<cmath>
#define ll long long
#define rep(i,a,n) for(int i=(a);i<(n);i++)
using namespace std;

int main() {
	int n;
	cin >> n;
	vector<int> a(n),ans;
	
	rep(i, 1,n+1) {
		cin >> a[i-1];
		if ((n - i) % 2 == 1) ans.emplace_back(0,a[i-1]);
		else ans.push_back(a[i - 1]);
	}
	rep(i, 0, n) {
		cout << ans[i] << endl;
	}

	return 0;
}

Compiler output:
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/c++allocator.h:33,
                 from /usr/include/c++/14/bits/allocator.h:46,
                 from /usr/include/c++/14/string:43,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/new_allocator.h: In instantiation of 'void std::__new_allocator<_Tp>::construct(_Up*, _Args&& ...) [with _Up = int; _Args = {int, int&}; _Tp = int]':
/usr/include/c++/14/bits/alloc_traits.h:575:17:   required from 'static void std::allocator_traits<std::allocator<_CharT> >::construct(allocator_type&, _Up*, _Args&& ...) [with _Up = int; _Args = {int, int&}; _Tp = int; allocator_type = std::allocator<int>]'
  575 |           __a.construct(__p, std::forward<_Args>(__args)...);
      |           ~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/vector.tcc:117:30:   required from 'std::vector<_Tp, _Alloc>::reference std::vector<_Tp, _Alloc>::emplace_back(_Args&& ...) [with _Args = {int, int&}; _Tp = int; _Alloc = std::allocator<int>; reference = int&]'
  117 |             _Alloc_traits::construct(this->_M_impl, this->_M_impl._M_finish,
      |             ~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  118 |                                      std::forward<_Args>(__args)...);
      |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:21:41:   required from here
   21 |                 if ((n - i) % 2 == 1) ans.emplace_back(0,a[i-1]);
      |                                       ~~~~~~~~~~~~~~~~^~~~~~~~~~
/usr/include/c++/14/bits/new_allocator.h:191:11: error: new initializer expression list treated as compound expression [-fpermissive]
  191 |         { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); }
      |           ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C++

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


int main() {
  ll n; cin >> n;
  vector<ll> vec1;
  vector<ll> vec2;
  for (ll i = 0;i<n;i++) {
    ll a;
    cin >> a;
    if (i%2==0) {
      vec1.push_back(a);
    }
    else vec2.push_back(a);
  }
  reverse(vec2.begin(),vec2.end());
  for (ll i = 0;i<vec2.size();i++) cout << vec2.at(i) << " ";
  for (ll i = 0;i<vec1.size();i++) cout << vec1.at(i) << " ";
  }
}
  
  
    



Compiler output:
a.cc:22:1: error: expected declaration before '}' token
   22 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define rep2(i, a, n) for(ll i = a; i < (ll)(n); i++)
#define memi cout << endl
#define kono(n) cout << fixed << setprecision(n)
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define hina cout << ' '
#define in(n) cin >> n
#define in2(n, m) cin >> n >> m
#define in3(n, m, l) cin >> n >> m >> l
#define out(n) cout << n
const ll mei = (ll)1e9 + 7;

int main(){
  ll n;
  in(n);
  vector<ll> a(n), c, d;
  rep(i, n)
    in(a[i]);
  rep(i, n){
    if(i % 2 == 0)
      c.pb(a[i]);
    else
      d.pb(a[i]);
  }
  if(n % 2 == 0){
    rep(i, c.size()){
      out(c[c.size - 1 - i]);
      hina;
    }
    rep(i, d.size()){
      out(d[i]);
      hina;
    }
  }
  else{
    rep(i, d.size()){
      out(d[d.size() - 1 - i]);
      hina;
    }
    rep(i, c.size()){
      out(c[i]);
      hina;
    }
  }
  memi;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:15: error: invalid use of member function 'std::vector<_Tp, _Alloc>::size_type std::vector<_Tp, _Alloc>::size() const [with _Tp = long long int; _Alloc = std::allocator<long long int>; size_type = long unsigned int]' (did you forget the '()' ?)
   31 |       out(c[c.size - 1 - i]);
      |             ~~^~~~
a.cc:14:24: note: in definition of macro 'out'
   14 | #define out(n) cout << n
      |                        ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
long long a[200003],l,r,n,g;
int main(){
cin>>n;
l=n/2-1,r=n/2+1,g=?;
cin>>a[n/2];
for(int i=1;i<n;i++){
if(g==0) cin>>a[l],l--;
else cin>>a[r],r++;
g=!g;}
for(int i=0;i<n;i++) cout<<a[i]<<" ";}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:19: error: expected primary-expression before '?' token
    6 | l=n/2-1,r=n/2+1,g=?;
      |                   ^
a.cc:6:20: error: expected primary-expression before ';' token
    6 | l=n/2-1,r=n/2+1,g=?;
      |                    ^
a.cc:6:20: error: expected ':' before ';' token
    6 | l=n/2-1,r=n/2+1,g=?;
      |                    ^
      |                    :
a.cc:6:20: error: expected primary-expression before ';' token
Language: C++


#include <bits/stdc++.h>

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

using namespace std;
typedef long long ll;
typedef pair<ll, ll> pi;

//vector<vector<ll> > comb(ll n, ll b){
void comb(vector<vector <ll> > &v, ll n){
  cout << v.size();
  rep(i, n){
    v[i][0] = 1;
    v[i][i] = 1;
  }

  rep(j, n) {
    rep(k,j) {
      v[j][k] = (v[j-1][k-1] + v[j-1][k]);
    }
  }
}


int main(){
  ll n;
  cin >> n;
  ll ans;
  vector<ll> v(n);

  if (n==1) {
    cin >> ans;
    cout << ans << endl;
      return 0;
  }

  if (n%2==0){
    rep(i,n) {
      if (i%2==0) cin >> v.at(i/2+n/2-1);
      else cin >> v.at(-i/2+n/2);
    }
  else {
    rep(i,n){
    if (i==1) cin >> v.at(n/2);
    else if (i%2==0) cin >> v.at(i/2+n/2+1);
    else cin >> v.at(-i/2+n/2-1);
  }
  }
  rep(i,n) cout << v.at(i) << " ";
  cout << endl;
  }

}

Compiler output:
a.cc: In function 'int main()':
a.cc:43:3: error: expected '}' before 'else'
   43 |   else {
      |   ^~~~
a.cc:38:14: note: to match this '{'
   38 |   if (n%2==0){
      |              ^
a.cc: At global scope:
a.cc:54:1: error: expected declaration before '}' token
   54 | }
      | ^
Language: C++

#pragma GCC optimize("Ofast")
#include<bits/stdc++.h>
using namespace std;
using ll=long long;
using ld=long double;
const ll LL_MAX=LLONG_MAX;
struct In{
    template<typename T>
    operator T(){
        T x;
        cin >> x;
        return x;
    }
};

template <typename T,typename U>
void forin(T* x,U n){
    for (U i=0;i<n;i++) cin >> x[i];
}

template <typename T>
int div1(T x) {
    return x%1000000007;
}

template <typename T>
void out(T x){
    cout << x << endl;
}

int main(){
    In in;
    int n=in,a[n];
    forin(a,n);
    deque<int> ans;
    bool m=true;
    for (int i=0;i<n;i++){
        if (m){
            ans.push_back(a[i]);
            m=false;
        }
        else{
            ans.push_front(a[i]);
            m=true;
        }
    }
    if (i%2!=0) reverse(ans.begin(),ans.end());
    for (int i=0;i<n;i++){
        cout << ans[i] << ' ';
    }
    cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:9: error: 'i' was not declared in this scope
   47 |     if (i%2!=0) reverse(ans.begin(),ans.end());
      |         ^
Language: C++

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

#define pb push_back
#define pf push_front

int n, t;
deque<int> b;
bool rev;

int main(void)
{
	cin >> n;
	for (int i = 0; i < n; i++) {
		cin >> t;
		if (!rev) {
			b.pb(t);
			rev = true;
		} else {
			b.pf(t);
			rev = false;
		}
	}
	if (!rev) {
		for (int i = 0; i < b.size(); i++)
			cout << b[i] << " ";
		cout << "\n";
    } else {
      	for (int i = b.size() - 1; i <= 0; i--)
          cout << b[i] << " ";
      cout << "\n";
    }
}
}

Compiler output:
a.cc:35:1: error: expected declaration before '}' token
   35 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define all(x) x.begin(),x.end()
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
template<class T> inline bool chmax(T&a,T b){if(a<b){a=b;return 1;}return 0;}
template<class T> inline bool chmin(T&a,T b){if(a>b){a=b;return 1;}return 0;}
typedef long long ll;

int n,m,k;
string s,t;

int main() {
  cin >> n;
  int a[201010];
  rep(i,n) cin >> a[i];
  deque<int> b;
  rep(i,n){
    if(i%2==0) b.push_back(a[i]);
    else b.push_front(a[i]);
  }
  rep(i,n){
    int x;
    if(n%2==0) x=b.front(),b,pop_front();
    else x=b.back(),b.pop_back();
    cout << x << " ";
  }
  cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:30: error: 'pop_front' was not declared in this scope
   23 |     if(n%2==0) x=b.front(),b,pop_front();
      |                              ^~~~~~~~~
Language: Java

import java.util.*;
public class Main{
 public static void main(String[] args){
   Scanner sc = new Scanner(System.in);
 
   int N = sc.nextInt();
   int[] m = new int[N];
   int[] ans = new int[]; 
   for(int i=0;i<N;i++) 
   {
     m[i] = sc.nextInt();
   } 

   if(N%2==0)
   {
     for(int i =0;i<N/2;i++) ans[i] = m[N-1-2*i];
     for(int i =0;i<N/2;i++) ans[i+N/2]= m[2*i];
   }
   else
   {
     for(int i= 0;i<(N+1)/2;i++) ans[i] = m[N-1-2*i];
     for(int i= 0;i<(N-1)/2;i++) ans[i] = m[2+2*i];
   }
   for(int i=0;i<N;i++)System.out.println(ans[i]+" ");
 }
}

Compiler output:
Main.java:8: error: array dimension missing
   int[] ans = new int[]; 
                        ^
1 error
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 print(vector<int> vec){
  int n = SZ(vec) ;
  REP(i,n){
    cout << vec.at(i) <<" " ;
  }
  cout <<endl ;
}
  


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


int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  int n ;
  cin >> n ;
  vector<int> a(n) ;
  REP(i,n){
    cin >> a.at(i) ;
  }
  deque<int> deq ;
  vector<int> ans ;
  REP(i,n){
    if(i%2==0){
      deq.push_front(a.at(i)) ;
    }
    else{
      deq.push_back(a.at(i)) ;
    }
  }
  if(n%2==0){
    REP(i,n){
      ans.push_back(deq.back()) ;
      deq.pop_back() ;
    }
  }
  else{
    REP(i,n){
      ans.push_back(dqq.front()) ;
      deq.pop_front() ;
      }
  }
  print(ans) ;      
    
      
  
  
  return 0 ;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:72:21: error: 'dqq' was not declared in this scope; did you mean 'deq'?
   72 |       ans.push_back(dqq.front()) ;
      |                     ^~~
      |                     deq
Language: C++

#include <bits/stdc++.h>
#define maxn 200005
#define ll long long
using namespace std;

int main()
{
  int n;
  cin>>n;
  vector<int> v;
  for(int i=0;i<n;i++){
    cin>>pre[i];
  }
  int i;
  for(i=n-1;i>=0;i-=2){
    v.push_back(pre[i]);
  }
  i ++;
  if(n % 2 == 1) i += 2;
  for(;i<=n-2;i+=2){
    v.push_back(pre[i]);
  }
  for(int i=0;i<v.size();i++){
    cout<<v[i]<<" ";
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:10: error: 'pre' was not declared in this scope; did you mean 'pread'?
   12 |     cin>>pre[i];
      |          ^~~
      |          pread
a.cc:16:17: error: 'pre' was not declared in this scope; did you mean 'pread'?
   16 |     v.push_back(pre[i]);
      |                 ^~~
      |                 pread
a.cc:21:17: error: 'pre' was not declared in this scope; did you mean 'pread'?
   21 |     v.push_back(pre[i]);
      |                 ^~~
      |                 pread