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

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

int main() {
    int a;
    deque<int> some;
    int n; cin >> n;
    for (int i = 0; i < n; i++) {
        cin >> a;
        if (i % 2 == n % 2) {
            some.push_back(a);
        } else {
            some.push_front(a);
        }
    }
    for (int x:some) {
        cout << x << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

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

int main(void) {
	int n;
	cin >> n;
	int x[200001];
	vector <int> y;
	for (int i = 0; i < n; i++) {
		cin >> x[i];
	}
	for (int i = 0; i < n; i++) {
		y.push_back(x[i]);
		reverse(y.begin(), y.end());
	}
	for (int i = 0; i < n - 1; i++)
		cout << y[i] << " ";
	//printf("%\n", y[n - 1]);
	cout << y[n - 1] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: 'reverse' was not declared in this scope
   16 |                 reverse(y.begin(), y.end());
      |                 ^~~~~~~
Language: C++

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

int main(void) {
	int n;
	scanf("%d", &n);
	int x[200001];
	vector <int> y;
	for (int i = 0; i < n; i++) {
		cin >> x[i];
	}
	for (int i = 0; i < n; i++) {
		y.push_back(x[i]);
		reverse(y.begin(), y.end());
	}
	for (int i = 0; i < n - 1; i++)
		cout << y[i] << " ";
	//printf("%\n", y[n - 1]);
	cout << y[n - 1] << endl;
	return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: 'reverse' was not declared in this scope
   16 |                 reverse(y.begin(), y.end());
      |                 ^~~~~~~
a.cc:22:18: error: expected '}' at end of input
   22 |         return 0;
      |                  ^
a.cc:6:16: note: to match this '{'
    6 | int main(void) {
      |                ^
Language: C++

#define _CRT_SECURE_NO_WARNINGS
#include <iostream>
#include <vector>
#include <string>
using namespace std;

int main(void) {
	int n;
	scanf("%d", &n);
	int x;
	vector <int> y;
	for (int i = 0; i < n; i++) {
		scanf("%d", &x);
		y.push_back(x);
		reverse(y.begin(), y.end());
	}
	for (int i = 0; i < n - 1; i++)
		cout << y[i] << " ";
	//printf("%\n", y[n - 1]);
	cout << y[n - 1] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:17: error: 'reverse' was not declared in this scope
   15 |                 reverse(y.begin(), y.end());
      |                 ^~~~~~~
Language: C++

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

int main() {
	int n;
	cin >> n;
	long long int x;
	vector <long long int> str;
	for (int i = 0; i < n; i++) {
		cin >> x;
		str.push_back(x);
		reverse(str.begin(), str.end());
	}
	for (int i = 0; i < n - 1; i++)
		cout << str[i] << " ";
	cout << str[n - 1] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: 'reverse' was not declared in this scope
   14 |                 reverse(str.begin(), str.end());
      |                 ^~~~~~~
Language: C++

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

int main() {
	int n;
	cin >> n;
	long long int x;
	vector <long long int> str;
	for (int i = 0; i < n; i++) {
		cin >> x;
		str.push_back(x);
		reverse(str.begin(), str.end());
	}
	for (int i = 0; i < n - 1; i++)
		cout << str[i] << " ";
	cout << str[n - 1] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:17: error: 'reverse' was not declared in this scope
   13 |                 reverse(str.begin(), str.end());
      |                 ^~~~~~~
Language: C++

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

using namespace std;

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

int n;
string s[200000];

int main(){
    cin >> n;
    REP(i, n){
        string t;
        cin >> t;
        s[i] = t;
    }

    string o = s[0];
    for(int i=1; i<n; i++){
        if(i%2==0){
            o += " " + s[i];
        } else {
            o = s[i] + " " + o;
        }
    }
    if(n!=1 && (n-1)%2==0) reverse(o.begin(), o.end());

    cout << o << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:28:28: error: 'reverse' was not declared in this scope
   28 |     if(n!=1 && (n-1)%2==0) reverse(o.begin(), o.end());
      |                            ^~~~~~~
Language: C++

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

int main(){

  int n, a;
  deque<int> dp;

  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> a;
    if(i % 2 == (n-1) % 2) dp.push_front(a);
    else dp.push_back(a);
  }
  for(int i = 0; i < n; i++){
    cout << v[i] << ((i == n-1) ? "\n" : " ");
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:13: error: 'v' was not declared in this scope
   17 |     cout << v[i] << ((i == n-1) ? "\n" : " ");
      |             ^
Language: C++

#include<stdio.h>

int array [512345];

int a [212345];

int main () {
 int n;
 scanf ("%d", &n);
 for (int i=0; i<n; ++i) scanf ("%d", &a[i]) ;
 int left =212345 , right = left +1;
 for (int i=0; i<n; ++i){
 if(i%2 == (n -1) %2) {
 array [left - -]=a[i];
 } else {
 array [ right ++]= a[i];
 }
 }
 for (int i= left +1; i< right ; ++i) {
 printf ("%d␣",array [i]) ;
 }
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: expected primary-expression before ']' token
   14 |  array [left - -]=a[i];
      |                 ^
Language: C++

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

int main(){
  int n,a;
  deque<int>sort;
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> a;
    if(i % 2 == n % 2){
      sort.push_back(a);
    }else{
      sort.push_front(a);
    }
  }
  cout << x << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:11: error: 'x' was not declared in this scope
   16 |   cout << x << endl;
      |           ^
Language: C++

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

int main(){
  int n,a;
  deque<int>sort;
  cin >> n;
  for(int i = 0; i < n; i++){
    cin >> a;
    if(i % 2 == n % 2){
      sort.push_back(a);
    }else{
      sort.push_front(a);
    }
  }
  for(int x:some){
    cout << x << endl;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:13: error: 'some' was not declared in this scope
   16 |   for(int x:some){
      |             ^~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <vector>
#include <cstdlib>
#include <iomanip>
#include <cmath>
#include <ctime>
#include <map>
#include <set>
#include <queue>
#include <stack>
using namespace std;
#define lowbit(x) (x&(-x))
#define max(x,y) (x>y?x:y)
#define min(x,y) (x<y?x:y)
#define MAX 100000000000000000
#define MOD 1000000007
#define pi acos(-1.0)
#define ei exp(1)
#define PI 3.141592653589793238462
#define INF 0x3f3f3f3f3f
#define mem(a) (memset(a,0,sizeof(a)))
typedef long long ll;
ll gcd(ll a,ll b){
    return b?gcd(b,a%b):a;
}
const int N=200005;
const int mod=1e9+7;
int a[N];
int main()
{
    std::ios::sync_with_stdio(false);
    while(cin>>n){
        for(int i=1;i<=n;++i){
            cin>>a[i];
        }
        if(n&1){
            cout<<a[n];
            for(int i=n-2;i>=1;i-=2)
                cout<<" "<<a[i];
            for(int i=2;i<=n-1;i+=2)
                cout<<" "<<a[i];
            cout<<endl;
        }else{
            cout<<a[n];
            for(int i=n-2;i>=2;i-=2)
                cout<<" "<<a[i];
            for(int i=1;i<=n-1;i+=2)
                cout<<" "<<a[i];
            cout<<endl;
        }
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:35:16: error: 'n' was not declared in this scope
   35 |     while(cin>>n){
      |                ^
Language: C++

#include <stdio.h>
#include <iostream>
#include <sstream>
#include <algorithm>
#define FOR(x, y, z) for(int x = (z); y; x++)
#define rep(x, y) for(int x = 0; x < (y); x++)
#define all(x) x.begin(), x.end()
#define len(x) (sizeof(x) / sizeof(x[0]))
#define split_str(str, sp_word) istringstream stream(str); string res; while(getline(stream,res,sp_word))
#define rem_space(x) x.erase(remove(all(x), ' '),x.end())
#define scl(x) fgets(x, sizeof x, stdin)
#define down_queue(x) priority_queue<x>
#define up_queue(x) priority_queue<x, vector<x>, greater<x>>
using namespace std;

int main(){
 int N;
 scanf("%d",&N);
 getchar();

 vector<int> ary;
 vector<int> anser;

 string line;
 getline(cin,line);
 split_str(line,' '){
   anser.push_back(atoi(res.c_str()));
   reverse(all(anser));
 }

 rep(i,N - 1) printf("%d ",anser[i]);
 printf("%d\n",anser[N - 1]);
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:2: error: 'vector' was not declared in this scope
   21 |  vector<int> ary;
      |  ^~~~~~
a.cc:5:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    4 | #include <algorithm>
  +++ |+#include <vector>
    5 | #define FOR(x, y, z) for(int x = (z); y; x++)
a.cc:21:9: error: expected primary-expression before 'int'
   21 |  vector<int> ary;
      |         ^~~
a.cc:22:9: error: expected primary-expression before 'int'
   22 |  vector<int> anser;
      |         ^~~
a.cc:27:4: error: 'anser' was not declared in this scope
   27 |    anser.push_back(atoi(res.c_str()));
      |    ^~~~~
a.cc:31:28: error: 'anser' was not declared in this scope
   31 |  rep(i,N - 1) printf("%d ",anser[i]);
      |                            ^~~~~
a.cc:32:16: error: 'anser' was not declared in this scope
   32 |  printf("%d\n",anser[N - 1]);
      |                ^~~~~
Language: Java

import java.util.ArrayDeque;
import java.util.Iterator;
import java.util.Scanner;

// Java8
public class sample
{
	static Scanner sc = new Scanner(System.in);

	public static void main(String[] args) throws Exception
	{
		new sample().run();
	}

	void run()
	{
		int n = sc.nextInt();
		ArrayDeque<Integer> deq = new ArrayDeque<>(n+1);
		for(int i=0; i<n; i++)
		{
			int a = sc.nextInt();
			if((i&1)==0)
			{
				deq.offerLast(a);
			}
			else
			{
				deq.offerFirst(a);
			}
		}
		Iterator<Integer> itr = (n&1)==0 ? deq.iterator() : deq.descendingIterator();
		System.out.print(itr.next());
		while(itr.hasNext())
		{
			System.out.print(" ");
			System.out.print(itr.next());
		}
		System.out.println();
	}
}

Compiler output:
Main.java:6: error: class sample is public, should be declared in a file named sample.java
public class sample
       ^
1 error
Language: Java

import java.util.Scanner;

public class Main3 {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		Scanner scan = new Scanner(System.in);
		String str = "";
		String ans = "";
		String temp = "";
		for(int i = 0;i < n; i++){
			str = str + scan.next();
		}
		for(int i = 0;i < str.length(); i++){
			ans = ans + str.charAt(i);
			for(int j = 1 ; j < ans.length()+1;j++){
				temp = temp + ans.charAt(ans.length()-j);

			}
			ans = temp.substring(0, temp.length());
			temp = "";
		}
		System.out.println(ans);
	}

}


Compiler output:
Main.java:3: error: class Main3 is public, should be declared in a file named Main3.java
public class Main3 {
       ^
1 error
Language: C++

#include <stdio.h>
#include<string.h>

int a[200001];

int main(){
  int n;


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

  for(int i=n-1; i>=0, i-=2){
     printf("%d", a[i]);
  }

  if(n%2! = 0){
     for(int i=2; i <= n; i+=2){
        printf("%d", a[i]);
     }else{
        for(int i=1; i <= n; i+=2){
            printf("%d", a[i]);
        }
     }

  }

  return 0;

} 
  

Compiler output:
a.cc: In function 'int main()':
a.cc:16:28: error: expected ';' before ')' token
   16 |   for(int i=n-1; i>=0, i-=2){
      |                            ^
      |                            ;
a.cc:20:9: error: expected ')' before '!' token
   20 |   if(n%2! = 0){
      |     ~   ^
      |         )
a.cc:23:7: error: expected '}' before 'else'
   23 |      }else{
      |       ^~~~
a.cc:20:15: note: to match this '{'
   20 |   if(n%2! = 0){
      |               ^
a.cc: At global scope:
a.cc:31:3: error: expected unqualified-id before 'return'
   31 |   return 0;
      |   ^~~~~~
a.cc:33:1: error: expected declaration before '}' token
   33 | }
      | ^
Language: C++



#include <iostream>
#include <vector>
#include <string>
#include <limits.h>

using namespace std;

int main(void) {
 
    int N; cin >> N;
    vector<int> v;
    
    for (int i = 0; i < N; ++i) {
        
        cin >> v[i];
        
        reverse(v.begin(), v.end());
        
    }
    
    for (auto i : v) {
        
        cout << i << ' ';
        
    }
    
    cout << endl;
    
    return 0;
    
}

















Compiler output:
a.cc: In function 'int main()':
a.cc:19:9: error: 'reverse' was not declared in this scope
   19 |         reverse(v.begin(), v.end());
      |         ^~~~~~~
Language: C

    #include <stdio.h>
     
    int main(void) {
    int n,j;
    scanf("%d", &n); 
    int a[n];
    j =n;
    for (int i = 0; i < n; i++) {
       scanf("%d", &a[i]);
       j = 0;
       while (j =! i) { 
         a[j] = a[i-j];
         j++;
       }
    }
    for (int c = 0; c < n; c++) {
       printf("%d ",a[c]);
    }
     
    return 0
     
        
    } 
     
     
     
     
     
    }

Compiler output:
main.c: In function 'main':
main.c:20:13: error: expected ';' before '}' token
   20 |     return 0
      |             ^
      |             ;
......
   23 |     }
      |     ~        
main.c: At top level:
main.c:29:5: error: expected identifier or '(' before '}' token
   29 |     }
      |     ^
Language: C

#include <stdio.h>
int a[200001];
int main(){
  int n,i;
  scanf("%d",&n);
  for(i=0;i<n;i++)scanf("%d",&a[i]);
  i=0;
  if(n>1){
    for(i=n-1;i>=0;i-=2)printf("%d ",a[i]);
    i=(i==-1)?0:1;
    for(;i<n-2;i+=2)printf("%d ",a[i]);
  }
  printf("%d\n",a[i]);
  r

Compiler output:
main.c: In function 'main':
main.c:14:3: error: 'r' undeclared (first use in this function)
   14 |   r
      |   ^
main.c:14:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:14:4: error: expected ';' at end of input
   14 |   r
      |    ^
      |    ;
main.c:14:3: error: expected declaration or statement at end of input
   14 |   r
      |   ^
Language: C++

#include<iostream>
#include<deque>
using namespace std;
int main(){
	int a;
	deque<int>some;
	int n;
	for(int i=0;i<n;i++){
		cin>>a;
		if(i%2==n%2){
			some.push_back(a);
		}
		else{
			some.push=back(a);
		}
	}
	for(int x:some){
		cout<<x<<endl;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:30: error: 'class std::deque<int>' has no member named 'push'
   14 |                         some.push=back(a);
      |                              ^~~~
a.cc:14:35: error: 'back' was not declared in this scope
   14 |                         some.push=back(a);
      |                                   ^~~~
Language: C++

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

list<int> ans;
int n;
int x;

int main()
{
	scanf("%d" , &n);
	bool flag = 0;
	if(n & 1)
		flag = 0;
	else
		flag = 1;
	for(int i = 1 ; i <= n ; ++i)
	{
		scanf("%d" , &x);
		if(flag)
		{
			ans.push_back(x);
			flag = !flag;
			//printf("flag1:%d" , flag);
		}
		else
		{
			ans.push_front(x);
			flag = !flag;
			//printf("flag2:%d" , flag);
		}
	}

	for(auto t:ans)
	{
		printf("%d " , t);
	}


Compiler output:
a.cc: In function 'int main()':
a.cc:36:10: error: expected '}' at end of input
   36 |         }
      |          ^
a.cc:9:1: note: to match this '{'
    9 | {
      | ^
Language: C++

#include<cstdio>
#include<iostream>
using namespace std;
int main(){
	long long int i,j,a[200000],b[200000],temp[200000],n;
	cin>>n;
	for(i=0;i<n;i++) cin>>a[i];
	i=0;
	while(1){
		if(i==n)break
		b[i]=a[i];
		for(j=0;j<=i;j++)temp[j]=b[j];
		for(j=i;j>=0;j--)b[i-j]=temp[j];
		i++;
	}
	for(i=0;i<n-1;i++) cout<<b[i]<<' ';
	cout<<b[n-1]<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:30: error: expected ';' before 'b'
   10 |                 if(i==n)break
      |                              ^
      |                              ;
   11 |                 b[i]=a[i];
      |                 ~
Language: C++

//AtCoder Beginner Contest 066 C
#include <iostream>
#include <string>
#include <deque>

using namespace std;


int main() {
	
	int n;
	cin >> n;
	int a[200010];

	for (int i = 0; i < n; i++) {
		scanf_s("%d",&a[i]);
	}

	deque<int>que;
	int flag = 0;
	if (a[n-1] % 2 == 0) {//最後が偶数なら偶数はすべて前に挿入
		flag = 1;
	}
	for (int i = 0; i < n;i++) {
		if (flag == 1) {
			if (a[i] % 2 == 0) que.push_front(a[i]);//偶数なら前に
			else que.push_back(a[i]);//奇数なら後ろに
		}
		else {
			if (a[i] % 2 != 0) que.push_front(a[i]);//奇数なら前に
			else que.push_back(a[i]);//偶数なら後ろに

		}
	}

	for (int i = 0; i < que.size();i++) {
		if (i == n - 1) cout << que[i] << endl;
		else cout << que[i] << " ";
	}

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:17: error: 'scanf_s' was not declared in this scope; did you mean 'scanf'?
   16 |                 scanf_s("%d",&a[i]);
      |                 ^~~~~~~
      |                 scanf
Language: C++

#include <bits/stdc++.h>
//#ifdef MYDEBUG
#define debug(x) cout<<#x<<": "<<x<<endl
#define ifcin(x) std::ifstream cin(x)
#else
#define debug(x)
#define ifcin(x)
#endif
#define ll long long
#define esp 1e-14
#define all(x) x.begin(),x.end()
#define rep(i,from,to) for(int i=from;i<to;++i)
#define REP(i,from,to) for(int i=from;i<=to;++i)
using namespace std;

int n, a, b;
const int MAX = 1000000001;
vector<int> Y, T;
void solve() {
	cin >> n;
	if (n % 2 == 0) {
		rep(i,0,n/2)
		{
			cin >> a >> b;
			Y.push_back(a);
			T.push_back(b);
		}
			for (int i = n / 2 - 1; i >= 0; --i) {
				cout << T[i] << " ";
			}
			for (int i = 0; i < n / 2 ; ++i) {
				if(i>0)cout<<" ";
				cout << Y[i] ;
			}
			cout<<endl;

	} else {
		rep(i,0,n/2-1)
		{
			cin >> a >> b;
			Y.push_back(a);
			T.push_back(b);
		}
		cin>>a;
			Y.push_back(a);
			for (int i = n / 2 + 1; i >= 0; --i) {
				cout << Y[i] << " ";
			}
			for (int i = 0; i < n / 2 ; ++i) {
				if(i>0)cout<<" ";
				cout << T[i];
			}
			cout<<endl;

	}

}
int main() {
	solve();
	return 0;
}


Compiler output:
a.cc:5:2: error: #else without #if
    5 | #else
      |  ^~~~
a.cc:6:9: warning: "debug" redefined
    6 | #define debug(x)
      |         ^~~~~
a.cc:3:9: note: this is the location of the previous definition
    3 | #define debug(x) cout<<#x<<": "<<x<<endl
      |         ^~~~~
a.cc:7:9: warning: "ifcin" redefined
    7 | #define ifcin(x)
      |         ^~~~~
a.cc:4:9: note: this is the location of the previous definition
    4 | #define ifcin(x) std::ifstream cin(x)
      |         ^~~~~
a.cc:8:2: error: #endif without #if
    8 | #endif
      |  ^~~~~
Language: C++

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

int main()
{
  int n; cin >> n;
  vector<int> a, b;
  for (int i = 0; i < n; i++) {
    int stdin;
    cin >> stdin;
    a.push_back(stdin);
  }

  for (int i = 0; i < n; i++) {
    b.push_back(a[i]);
    reverse(b.begin(), b.end());
  }

  for (int i = 0; i < n; i++) {
    cout << b[i] << " ";
  }
  cout << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:5: error: 'reverse' was not declared in this scope
   17 |     reverse(b.begin(), b.end());
      |     ^~~~~~~
Language: C++

import Data.Maybe
import qualified Data.ByteString.Char8 as B
main=putStrLn.unwords.map show.solve.map (fst.fromJust.B.readInt).B.words=<<B.getContents
solve (n:as)
  |odd n=reverse a1s++a2s
  |otherwise=reverse a2s++a1s
  where (a1s,a2s)=(f odd&&&f even)as
f g=map snd.filter (g.fst).zip [1..]

Compiler output:
a.cc:8:33: error: too many decimal points in number
    8 | f g=map snd.filter (g.fst).zip [1..]
      |                                 ^~~
a.cc:1:1: error: 'import' does not name a type
    1 | import Data.Maybe
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++

#include <iostream>
#include <queue>
#include <stack>
#include <string>
#include <set>
#include <map>
#include <cctype>
#include <deque>
#define rep(i,a,b) for(int i=a; i<b; i++)
#define rrep(i,a,b) for(int i=a; i>=b; i--)
using namespace std;

int main(){
    deque<int> dq;
    int n,a;
    cin>>n;
    rep(i,0,n){
        cin>>a;
        if(i%2==1){
            dq.push_back(a);
        }else{
            dq.push_front(a);
        }
    }
    if(n%2==0){
        reverse(dq.begin(),dq.end());
    }
    rep(i,0,n){
        if(i)cout<<" ";
        cout<<dq[i];
    }
    cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:9: error: 'reverse' was not declared in this scope
   26 |         reverse(dq.begin(),dq.end());
      |         ^~~~~~~
Language: C++

#include <iostream>
#include <queue>
#include <stack>
#include <string>
#include <set>
#include <map>
#include <cctype>
#include <deque>
#define rep(i,a,b) for(int i=a; i<b; i++)
#define rrep(i,a,b) for(int i=a; i>=b; i--)
using namespace std;

int main(){
    deque<int> dq={};
    int n,a;

    cin>>n;
    rep(i,0,n){
        cin>>a;
        if(i%2==1){
            dq.push_back(a);
        }else{
            dq.push_front(a);
        }
    }
    if(n%2==0){
        reverse(dq.begin(),dq.end());
    }
    rep(i,0,n){
        if(i)cout<<" ";
        cout<<dq[i];
    }
    cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:9: error: 'reverse' was not declared in this scope
   27 |         reverse(dq.begin(),dq.end());
      |         ^~~~~~~
Language: C++

#include <stdio.h>
#include <stdlib.h>
int main()
{
	int *S,*T;
	int i,n,j,t;
	scanf("%d",&n);
	S=malloc(sizeof(int)*n);
	T=malloc(sizeof(int)*n);
	for(i=0;i<n;i++)
		scanf("%d",&S[i]);
	for(i=0;i<n;i++){
		T[i]=S[i];
		for(j=0;j<((i+1)/2);j++){
			t=T[j];
			T[j]=T[i-j];
			T[i-j]=t;
		}
	}
	for(i=0;i<n;i++)
		printf("%d ",T[i]);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
    8 |         S=malloc(sizeof(int)*n);
      |           ~~~~~~^~~~~~~~~~~~~~~
      |                 |
      |                 void*
a.cc:9:17: error: invalid conversion from 'void*' to 'int*' [-fpermissive]
    9 |         T=malloc(sizeof(int)*n);
      |           ~~~~~~^~~~~~~~~~~~~~~
      |                 |
      |                 void*
Language: C++

#include<iostream>
using namespace std;
int main() {
	int n,ba=100001,fr=99999;
	int a[200000];int b[200001];cin >> n;
	for (int i = 0; i < n; i++) cin >> a[i];
	b[100000] = a[0];
	for (int i = 1; i < n; i++) {
		if (i % 2 == n % 2) { b[ba] = a[i];ba++;}else {b[fr] = a[i];fr--;}}
	for (int i = fr + 1; i < ba - 1; i++) {cout << b[i] << " ";}cout << b[ba - 1] << endl;}

Compiler output:
a.cc:9:38: error: extended character   is not valid in an identifier
    9 |                 if (i % 2 == n % 2) { b[ba] = a[i];ba++;}else {b[fr] = a[i];fr--;}}
      |                                      ^
a.cc: In function 'int main()':
a.cc:9:38: error: '\U000000a0b' was not declared in this scope
    9 |                 if (i % 2 == n % 2) { b[ba] = a[i];ba++;}else {b[fr] = a[i];fr--;}}
      |                                      ^~
Language: C++

#include <iostream>
#include <array>

int main(){
  std::array <int,200000> a;
  int n;
  std::cin>>n;
  for (int i;i<n;i++){
    std::cin>>a.at(i);
  }
  bool flag = true;
  while(flag){
    flag = true;
    n -=2;
    for(int i,i<n/2;i++){
      if(a.at(i)!=a.at(i+n/2)){
	  flag=false;
	}
    }
 }
    std::cout<<n<<std::endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:16: error: expected ';' before '<' token
   15 |     for(int i,i<n/2;i++){
      |                ^
      |                ;
a.cc:15:16: error: expected primary-expression before '<' token
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 a[]=new int[n];
            int i,j;
            for(i=0;i<n;i++){
            a[i]=sc.nextInt();
           }
           int b[],c[];
           for(i=1;i<=n;i++){
           b=new int[i];
           c=new int[i];
           for(j=0;j<i;j++){
           b[j]=a[j];
          }
           for(j=0;j<i;j++){
           c[i]=b[i-j-1];
          }
    }
          for(i=0;i<n;i++){
         System.out.print(c[i]+" ");
        }
    }
}

Compiler output:
Main.java:23: error: variable c might not have been initialized
         System.out.print(c[i]+" ");
                          ^
1 error
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 a[]=new int[n];
            int i,j;
            for(i=0;i<n;i++){
            a[i]=sc.nextInt();
           }
           int b[],c[];
           for(i=1;i<=n;i++){
           b[]=new int[i];
           c[]=new int[i];
           for(j=0;j<i;j++){
           b[j]=a[j];
          }
           for(j=0;j<i;j++){
           c[i]=b[i-j-1];
          }
    }
          for(i=0;i<n;i++){
         System.out.print(c[i]+" ");
        }
    }
}

Compiler output:
Main.java:13: error: not a statement
           b[]=new int[i];
            ^
Main.java:13: error: ';' expected
           b[]=new int[i];
              ^
Main.java:13: error: not a statement
           b[]=new int[i];
               ^
Main.java:14: error: not a statement
           c[]=new int[i];
            ^
Main.java:14: error: ';' expected
           c[]=new int[i];
              ^
Main.java:14: error: not a statement
           c[]=new int[i];
               ^
6 errors
Language: Java

int N=sc.nextInt();
		int[]a=new int[N];
		for(int i=0;i<N;i++){
			a[i]=sc.nextInt();
		}
		
		Deque<Integer> ad=new ArrayDeque<Integer>();
		
		for(int i=0;i<N;i++){
			if(i%2==N%2){
				ad.offerLast(a[i]);
			}else{
				ad.offerFirst(a[i]);
			}
		}
		for(Integer num : ad){
			System.out.print(num+" ");
		}
		System.out.println();

Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
int N=sc.nextInt();
^
  (use --enable-preview to enable unnamed classes)
Main.java:3: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		^
Main.java:3: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		            ^
Main.java:3: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		                ^
Main.java:5: error: class, interface, enum, or record expected
		}
		^
Main.java:9: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		^
Main.java:9: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		            ^
Main.java:9: error: class, interface, enum, or record expected
		for(int i=0;i<N;i++){
		                ^
Main.java:12: error: class, interface, enum, or record expected
			}else{
			^
Main.java:14: error: class, interface, enum, or record expected
			}
			^
Main.java:18: error: class, interface, enum, or record expected
		}
		^
11 errors
Language: C++

main(){
    int N;
    list<int> nums;
    scanf("%d",&N);
    int reverse = 0;//反転フラグ
    for(int i = 0;i < N;i++){
        int num;
        scanf("%d",&num);
        if(reverse){
            nums.push_front(num);
        }else{
            nums.push_back(num);
        }
        reverse = !reverse;
    }
    //出力
    list<int>::iterator itr;
    if(reverse){
        itr = nums.end();
    }else{
        itr = nums.begin();
    }
    for(int i = 0;i < N;i++){
        if(reverse){
            itr--;
        }else{
            itr++;
        }
        printf("%s%d",i!=0?" ":"",*itr);
    }
    printf("\n");
}

Compiler output:
a.cc:1:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    1 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:3:5: error: 'list' was not declared in this scope
    3 |     list<int> nums;
      |     ^~~~
a.cc:3:10: error: expected primary-expression before 'int'
    3 |     list<int> nums;
      |          ^~~
a.cc:4:5: error: 'scanf' was not declared in this scope
    4 |     scanf("%d",&N);
      |     ^~~~~
a.cc:10:13: error: 'nums' was not declared in this scope; did you mean 'num'?
   10 |             nums.push_front(num);
      |             ^~~~
      |             num
a.cc:12:13: error: 'nums' was not declared in this scope; did you mean 'num'?
   12 |             nums.push_back(num);
      |             ^~~~
      |             num
a.cc:17:10: error: expected primary-expression before 'int'
   17 |     list<int>::iterator itr;
      |          ^~~
a.cc:19:9: error: 'itr' was not declared in this scope
   19 |         itr = nums.end();
      |         ^~~
a.cc:19:15: error: 'nums' was not declared in this scope
   19 |         itr = nums.end();
      |               ^~~~
a.cc:21:9: error: 'itr' was not declared in this scope
   21 |         itr = nums.begin();
      |         ^~~
a.cc:21:15: error: 'nums' was not declared in this scope
   21 |         itr = nums.begin();
      |               ^~~~
a.cc:25:13: error: 'itr' was not declared in this scope
   25 |             itr--;
      |             ^~~
a.cc:27:13: error: 'itr' was not declared in this scope
   27 |             itr++;
      |             ^~~
a.cc:29:36: error: 'itr' was not declared in this scope
   29 |         printf("%s%d",i!=0?" ":"",*itr);
      |                                    ^~~
a.cc:29:9: error: 'printf' was not declared in this scope
   29 |         printf("%s%d",i!=0?" ":"",*itr);
      |         ^~~~~~
a.cc:1:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
  +++ |+#include <cstdio>
    1 | main(){
a.cc:31:5: error: 'printf' was not declared in this scope
   31 |     printf("\n");
      |     ^~~~~~
a.cc:31:5: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
Language: C++

#include <cctype>
#include <cmath>
#include <algorithm>
#include <bitset>
#include <complex>
#include <deque>
#include <exception>
#include <iostream>
#include <iterator>
#include <list>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>
#define REP(i, n) for(LL i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define FORR(i, m, n) for(int i = m;i >= n;i--)
#define SORT(v, n) sort(v, v+n);
#define VSORT(v) sort(v.begin(), v.end());
#define LL long long
#define pb(a) push_back(a)
#define INF 999999999
using namespace std;
typedef pair<int, int> P;
typedef pair<LL, LL> LP;
typedef pair<int, P> PP;
typedef pair<LL, LP> LPP;
 
int dy[]={0, 0, 1, -1, 0};
int dx[]={1, -1, 0, 0, 0};
 
int main(){
	LL n;
	cin >> n;
 
	vector<int> b;
 
	REP(i, n){
		int x;
		cin >> x;
	
		if((i % 2 == 0 && n % 2 == 0) ||
			(i % 2 == 1 && n % 2 == 1)){
			b.pb(x);
		}else{
			b.insert(b.begin(), x);
		}
	}
 
	REP(i, n){
		cout << b[i];
		if(i != n - 1){
			cout << " ";
		}
	}
	cout << endl;
 


Compiler output:
a.cc: In function 'int main()':
a.cc:59:22: error: expected '}' at end of input
   59 |         cout << endl;
      |                      ^
a.cc:35:11: note: to match this '{'
   35 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
int main(void){
	int n,temp;
	int a[200000];
	int b[200000];
	int	c[200000];
	
	cin >> n;
	for (int i = 0; i < n; i++) cin >> a[i];

	for (int i = 0; i < n; i++) {

		b[i] = a[i];

		for (int d = 0, int e = i; d < e; i++, e--)
		{
			temp = b[d];
			b[d] = b[e];
			b[e] = temp;
		}


	}

	for (int i = 0; i < n - 1; i++) {
		cout << b[i] << " ";
	}
	cout << b[n];
	cout << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:33: error: expected unqualified-id before 'int'
   16 |                 for (int d = 0, int e = i; d < e; i++, e--)
      |                                 ^~~
a.cc:16:32: error: expected ';' before 'int'
   16 |                 for (int d = 0, int e = i; d < e; i++, e--)
      |                                ^~~~
      |                                ;
a.cc:16:49: error: expected ')' before ';' token
   16 |                 for (int d = 0, int e = i; d < e; i++, e--)
      |                     ~                           ^
      |                                                 )
a.cc:16:56: error: 'e' was not declared in this scope
   16 |                 for (int d = 0, int e = i; d < e; i++, e--)
      |                                                        ^
Language: C

#include <iostream>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */
using namespace std;
int main(int argc, char** argv) {
long long  n;
cin>>n;
long long flag=n;
long long  a[n]={0},b[n]={0};
int t=1,count=0;
while(n--){
	cin>>a[t];
	b[t]=a[t];
	if(t>=2){
		int temp1=t;
		if(t%2==0){
			int i=1;
			while(i<t){
				int swap=0;
				swap=b[i];b[i]=b[t];b[t]=swap;
				i++;t--;
			}
			t=temp1;
		}
		else if(t%2!=0){
			int j=1;
			while(j!=t){
				int swap=0;
				swap=b[j];b[j]=b[t];b[t]=swap;
			
				j++;t--;
			}
			t=temp1;
		}
	}
	t++;
		
		}
	for(int k=1;k<flag;k++){
		cout<<b[k]<<" ";
	}
	cout<<b[flag];	

	

	return 0;
}

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

#include <iostream>
#include <vector>
#define MAX_NUM 1000000000
using namespace std;

int n;
int a[MAX_NUM];
int b[MAX_NUM];

int main()
{
    cin >> n;
    for (int i = 0; i < n; ++i) {
        cin >> a[i];
    }
    for (int i = 0; i < n; ++i) {
        b[i] = a[i];
        for (int j = 0; j < n / 2; ++j) {
            int tmp = b[i];
            b[i] = b[n-i-1];
            b[n-i-1] = tmp;
        }
    }
    for (int i = 0; i < n - 1; ++i) {
        cout << b[i] << " ";
    }
    cout << b[n-1] << endl;
    return 0;
}

Compiler output:
/tmp/ccGRkiuL.o: in function `main':
a.cc:(.text+0x96): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0xb6): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0xd9): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0xf1): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0x111): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0x163): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
a.cc:(.text+0x1b8): relocation truncated to fit: R_X86_64_PC32 against symbol `b' defined in .bss section in /tmp/ccGRkiuL.o
collect2: error: ld returned 1 exit status
Language: C

#include <stdio.h>

int main(void)
{
	int n, a[100000], b[100000], i, j = 0;

	scanf("%d", &n);

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

	for (i = n - 1;i >= 1;i -= 2) {
		b[j] = a[i];
		j++;
	}

	for (i = 0;i < n - 1;i + = 2) {
		b[j] = a[i];
	}

	for (i = 0; i < n - 1; i++) {
		printf("%d ", b[i]);
	}

	printf("%d\n", b[i]);

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:18:34: error: expected expression before '=' token
   18 |         for (i = 0;i < n - 1;i + = 2) {
      |                                  ^
Language: C++

#include <iostream>

using namespace std;

int main()
{
   int n;
   int a[200000];
   int b[200000];
   int i,k;
   cin>>n;
   for(i=1;i<=n;i++){
       cin>>a[i];
   }
   for(i=1;i<=n;i++){
       b[i]=a[i];
       for(k=0;k<(j/2);k++){
           b[1+k]=b[i-k];
       }
   }
   for(i=1;i<=n;i++){
       cout<<b[i]<<" ";
   }
   cout<<endl;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:19: error: 'j' was not declared in this scope
   17 |        for(k=0;k<(j/2);k++){
      |                   ^
Language: C++

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

using namespace std;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n, tmp;
    cin >> n;
    vector<int> b;
    for (int i = 0; i < n; ++i){
        cin >> tmp;
        b.push_back(tmp);
        reverse(b.begin(), *b[i]);
    }

    cout << b[0];
    for (int j = 1; j < n; ++j) cout << ' ' << b[j];
    cout << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:28: error: invalid type argument of unary '*' (have '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type' {aka 'int'})
   17 |         reverse(b.begin(), *b[i]);
Language: C++

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

using namespace std;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(false);

    int n, tmp;
    cin >> n;
    vector<int> b;
    for (int i = 0; i < n; ++i){
        cin >> tmp;
        b.push_back(tmp);
        reverse(b.begin(), b[i]);
    }

    cout << b[0];
    for (int j = 1; j < n; ++j) cout << ' ' << b[j];
    cout << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:16: error: no matching function for call to 'reverse(std::vector<int>::iterator, __gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type&)'
   17 |         reverse(b.begin(), b[i]);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:1083:5: note: candidate: 'template<class _BIter> void std::reverse(_BIter, _BIter)'
 1083 |     reverse(_BidirectionalIterator __first, _BidirectionalIterator __last)
      |     ^~~~~~~
/usr/include/c++/14/bits/stl_algo.h:1083:5: note:   template argument deduction/substitution failed:
a.cc:17:16: note:   deduced conflicting types for parameter '_BIter' ('__gnu_cxx::__normal_iterator<int*, std::vector<int> >' and 'int')
   17 |         reverse(b.begin(), b[i]);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~
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 <stdio.h>

/* run this program using the console pauser or add your own getch, system("pause") or input loop */

int main(int argc, char** argv) {
long   n=0;
scanf("%d",&n);
long  flag=n;
long   a[n]={0};
int t=1;
while(n--){
	scanf("%d",&a[t]);
	
	if(t>=2){
		int temp1=t;
		if(t%2==0){
			int i=1;
			while(i<t){
				int swap=0;
				swap=a[i];a[i]=a[t];a[t]=swap;
				i++;t--;
			}
			t=temp1;
		}
		else if(t%2!=0){
			int j=1;
			while(j!=t){
				int swap=0;
				swap=a[j];a[j]=a[t];a[t]=swap;
			
				j++;t--;
			}
			t=temp1;
		}
	}
	t++;
		
		}

	for(int k=1;k<flag;k++){
		printf("%d ",a[k]);
	}
printf("%d",a[flag]);

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:13: error: variable-sized object may not be initialized except with an empty initializer
    9 | long   a[n]={0};
      |             ^
Language: C++

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

int n;
vector<int> a;
vector<int> b;

void operation(int i)
{
    b.push_back(a[i]);
    reverse(b.begin(), b.end());
    return;
}

int main()
{
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int tmp;
        cin >> tmp;
        a.push_back(tmp);
    }
    for (int i = 0; i < n; ++i) {
        operation(i);
    }
    for (int i = 0; i < n - 1; ++i) {
        cout << b[i] << " ";
    }
    cout << b[n-1] << endl;
    return 0;
}


Compiler output:
a.cc: In function 'void operation(int)':
a.cc:12:5: error: 'reverse' was not declared in this scope
   12 |     reverse(b.begin(), b.end());
      |     ^~~~~~~
Language: C++

#include<iostream>
#include<string>
#include<algorithm>
#include<cstring>
using namespace std;
int main()
{
	int n, c = 1, flag = 1, i;
	char e;
	string line;
	cin >> n;
	while (n--)
	{
		cin >> e;
			line += e;
			reverse(line.begin(), line.end());
	}
	for (i = 0; i != line.length(); i++)
	{
		if (i) cout << ' ';
		cout << line[i];
	}
return 0；
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:8: error: unable to find numeric literal operator 'operator""\U0000ff1b'
   23 | return 0；
      |        ^~~
a.cc:23:11: error: expected ';' before '}' token
   23 | return 0；
      |           ^
      |           ;
   24 | }
      | ~
Language: C++

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

int main(void){

  //input
  int n;scanf("%d",&n);
  vector<int> v;
  
  for(int i=0; i<n ; i++){
    int tmp;scanf("%d",&tmp);
    v.push_back(tmp);
    reverse(begin(v),end(v));
  }

  //output
  for(int i=0; i<n ; i++){
    cout << v[i] << " "; 
  }
  cout << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'reverse' was not declared in this scope
   16 |     reverse(begin(v),end(v));
      |     ^~~~~~~
Language: C++

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

int main() {
  int n;
  vector<int> v;
  cin >> n;
  for(int i=0; i<n; i++) {
    int a;
    cin >> a;
    v.push_back(a);
  }
  vector<int> v2;
  for(int i=0; i<n; i++) {
    if(i==0) {
      v2.push_back(v[i]);
    }else {
      v2.push_back(v[i]);
      reverse(v2.begin(),v2.end());
      //cout << v2[0] << v2[1] << endl;                                                            
    }
  }

  for(int i=0; i<n; i++) {
    if(i<n-1) cout << v2[i] << " ";
    else cout << v2[i] << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:7: error: 'reverse' was not declared in this scope
   21 |       reverse(v2.begin(),v2.end());
      |       ^~~~~~~
Language: C++

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

int main(void){

  //input
  int n;scanf("%d",&n);
  vector<int> v;
  
  for(int i=0; i<n ; i++){
    int tmp;scanf("%d",&tmp);
    v.push_back(tmp);
    reverse(begin(v),end(v));
  }

  //output
  for(int i=0; i<n ; i++){
    cout << v[i] << " "; 
  }
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: 'reverse' was not declared in this scope
   16 |     reverse(begin(v),end(v));
      |     ^~~~~~~
Language: C++

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

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

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

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

using namespace std;

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


Compiler output:
a.cc: In function 'int main()':
a.cc:21:5: error: 'reverse' was not declared in this scope; did you mean 'evens'?
   21 |     reverse(odds.begin(), odds.end());
      |     ^~~~~~~
      |     evens
a.cc:28:5: error: 'reverse' was not declared in this scope; did you mean 'evens'?
   28 |     reverse(evens.begin(), evens.end());
      |     ^~~~~~~
      |     evens
Language: C++

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

int main() {
  int n;
  cin >> n;
  vector<int> a(n);
  vector<int> b;
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
  }
  for (int i = 0; i < n; ++i) {
    b.push_back(a[i]);
    std::reverse(b.begin(), b.end());
  }
  for (int i = 0; i < n; ++i) {
    cout << b[i];
    if (i != n - 1) {
      cout << " ";
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:10: error: 'reverse' is not a member of 'std'
   15 |     std::reverse(b.begin(), b.end());
      |          ^~~~~~~
Language: C++

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

int main(void){

  //input
  int n;scanf("%d",&n);
  vector<int> v;
  
  for(int i=0; i<n ; i++){
    int tmp;scanf("%d",&tmp);
    v.push_back(tmp);
    reverse(begin(v),end(v));
  }

  //output
  for(int i=0; i<n ; i++){
    cout << v[i] << " "; 
  }
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: 'reverse' was not declared in this scope
   15 |     reverse(begin(v),end(v));
      |     ^~~~~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;
#define MAXN 200002

int main()
{
    int n;
    cin>>n;
    int a[MAXN];
    int x;
    for(int i=1;i<=n;++i)   cin>>a[i];
    for(int i=n;i>0;i-=2)
    {
        cout<<a[i]<<' ';
        x = i+2;
    }
    for(x;x<n;x+=2)
    {
        cout<<a[x]<<' ';
    }


    return 0;
}#include <bits/stdc++.h>

using namespace std;
#define MAXN 200002

int main()
{
    int n;
    cin>>n;
    int a[MAXN];
    int x;
    for(int i=1;i<=n;++i)   cin>>a[i];
    for(int i=n;i>0;i-=2)
    {
        cout<<a[i]<<' ';
        x = i+2;
    }
    for(x;x<n;x+=2)
    {
        cout<<a[x]<<' ';
    }


    return 0;
}

Compiler output:
a.cc:25:2: error: stray '#' in program
   25 | }#include <bits/stdc++.h>
      |  ^
a.cc:25:3: error: 'include' does not name a type
   25 | }#include <bits/stdc++.h>
      |   ^~~~~~~
a.cc:30:5: error: redefinition of 'int main()'
   30 | int main()
      |     ^~~~
a.cc:6:5: note: 'int main()' previously defined here
    6 | int main()
      |     ^~~~
Language: C++

#include <iostream>
#include <fstream>
#include <cstdio>
#include <cassert>
#include <complex>
#include <cmath>
#include <algorithm>
#include <vector>
#include <string>
#include <cstdlib>
#include <cstring>
#include <iomanip>
#include <numeric>
#include <sstream>
#include <ctime>
#include <cctype>
#include <set>
#include <map>
#include <queue>
#include <bitset>
#include <deque>
#include <stack>
#include <memory.h>
#include <_mingw.h>
using namespace std;
#define long long ll
int a[200005],n,b[200005];
int main()
{
	cin>>n;
	for(int i=0;i<n;i++){
		cin>>a[i];
	}
	int eo=(n-1)%2;
	int cnt1=0;
	int cnt2=1;
	for(int i=n-1;i>=0;i--){
		if(i%2==eo){
			b[cnt1]=a[i];
			cnt1++;
		}
		if(i%2!=eo){
			b[n-cnt2]=a[i];
			cnt2++;
		}
	}
	for(int i=0;i<n;i++){
		cout<<b[i]<<" ";
	}
    return 0;
}

Compiler output:
a.cc:24:10: fatal error: _mingw.h: No such file or directory
   24 | #include <_mingw.h>
      |          ^~~~~~~~~~
compilation terminated.