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

a,b=sorted(map(int, input().split()))
c=(a+b)/2
if c.is_integer():
    print(int(c))
else:
    print("IMPOSSIBLE")


Compiler output:
a.cc:1:1: error: 'a' does not name a type
    1 | a,b=sorted(map(int, input().split()))
      | ^
Language: C++

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


int main(){
	long long a,b;
	cin >> a >> b;
	if((a-c)%2==0) cout << (a-c)/2+a << endl;
	else cout << "IMPOSSIBLE" << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: 'c' was not declared in this scope
    8 |         if((a-c)%2==0) cout << (a-c)/2+a << endl;
      |               ^
Language: C++

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


int main(){
	long long a,b;
	cin >> a >> b;
	if(a<b) swap(a,b);
	if((a-c)%2==0) cout << (a-c)/2+a << endl;
	else cout << "IMPOSSIBLE" << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: 'c' was not declared in this scope
    9 |         if((a-c)%2==0) cout << (a-c)/2+a << endl;
      |               ^
Language: C++

#include <iostream>
using namespace std;

int main()
{
    int a, b;
    cin >> a >> b;



    if ((a - b) % 2 == 1 || a < 0 || b < 0 || a = b)
    {
        cout << "IMPOSSIBLE" << endl;
    }
    else
    {
        cout << (a + b) / 2 << endl;
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:44: error: lvalue required as left operand of assignment
   11 |     if ((a - b) % 2 == 1 || a < 0 || b < 0 || a = b)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
Language: C++

#include <iostream>

using namespace std;

int main()
{
	int a, b, a_rem, b_rem;
	int ans;

	cin >> a >> b;

	a_rem = a % 2;
	b_rem = b % 2;


	if ((a == 0) && (b_rem == 0)) {
		ans = b / 2;
		cout << ans << endl;
	}
	else if ((a_rem == 0) && (b == 0)) {
		ans = a / 2;
		cout << ans << endl;
	}
	else if ((a == 0) || (b == 0)) {
		cout << "IMPOSSIBLE" << endl;
	}
	else if (a_rem == b_rem) {
		ans = (a + b) / 2;
		cout << abs(ans) << endl;
	}
	else if ((a_rem ! = 0) || (b_rem != 0)) {
		cout << "IMPOSSIBLE" << endl;
	}
	else {
		ans = (a - b) / 2;
		cout << abs(ans) << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:24: error: expected ')' before '!' token
   31 |         else if ((a_rem ! = 0) || (b_rem != 0)) {
      |                  ~     ^~
      |                        )
a.cc:33:10: error: expected ')' before 'else'
   33 |         }
      |          ^
      |          )
   34 |         else {
      |         ~~~~
a.cc:31:17: note: to match this '('
   31 |         else if ((a_rem ! = 0) || (b_rem != 0)) {
      |                 ^
a.cc:38:1: error: expected primary-expression before '}' token
   38 | }
      | ^
Language: C++

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

int main() {
  int A,B;
  cin >> A;
  cin >> B;
  
 if(A%2==B%2) {
 cout << (A+B)/2 << endl;
 }
 else {
   cout  << IMPOSSIBLE << endl;
 }

 
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:13: error: 'IMPOSSIBLE' was not declared in this scope
   13 |    cout  << IMPOSSIBLE << endl;
      |             ^~~~~~~~~~
Language: Java

import java.util.Scanner;

public class a{
        public  static void main(String[] args){
                calc();
        }
        static int calc(){
                Scanner sc = new Scanner(System.in);
                int a=sc.nextInt();
                int b=sc.nextInt();
                int c;
                if((a+b)%2==0){
                        c=(a+b)/2;
                        return c;
                }else{
                        System.out.println("IMPOSSIBLE");
                }
                return 0;
        }
}

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

#include <stdio.h>
int main(){
  int K, A, B;
  int X, Y, N;
  scanf("%d %d", &A, &B);
  if(A<B){
    N = B - A;
  }else{
    N = A - B;
  }
  for(K=0; K<=N; K++){
    X = A - K;
    Y = B - K;
    if(X < 0) X = -X;
    if(Y < 0) Y = -Y;
    if(X == Y){
      break;
    }else{
      X=0;
      Y=0;
    }
  }
  if ( X == 0 && Y == 0) printf("IMPOSSIBLE");
  else if(X == Y) printf("%d", K);
  return 0;


Compiler output:
main.c: In function 'main':
main.c:25:3: error: expected declaration or statement at end of input
   25 |   return 0;
      |   ^~~~~~
Language: C++

#include <iostream>
using namespace std;
 
int main(void)
{
  int a,b;
  int swap;
	cin >> a >> b;
 
  if ((a + b) % 2 == 0)
  {
    cout << (a + b) / 2;
  }
  else
  {
  	cout << "IMPOSSIBLE";
  }
}
#include <iostream>

int main(void)
{
  int a,b;
  int swap;
	cin >> a >> b;

  if ((a + b) % 2 == 0)
  {
    cout << (a + b) / 2;
  }
  else
  {
  	cout << "IMPOSSIBLE";
  }
}

Compiler output:
a.cc:21:5: error: redefinition of 'int main()'
   21 | int main(void)
      |     ^~~~
a.cc:4:5: note: 'int main()' previously defined here
    4 | int main(void)
      |     ^~~~
Language: Java

import java.util.Scanner;
 
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nsxtInt();
        int temp = a - b;
        if (temp % 2 == 0) {
            System.out.println(Math.abs(temp / 2));
        } else {
            System.out.println("IMPOSSIBLE");
        }
    }
}

Compiler output:
Main.java:7: error: cannot find symbol
        int b = sc.nsxtInt();
                  ^
  symbol:   method nsxtInt()
  location: variable sc of type Scanner
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
  int main () {
  int A ,B;
    
  cin >> A >> B;
  
  if((A + B) % 2 = 0 && B > A){
  cout << B - {(B - A) / 2};
  }
  
  else if ((A + B) % 2 = 0 && A > B){
  cout << A - {(A - B) / 2};
  }
    
  else{
  cout << "IMPOSSIBLE";
  }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: lvalue required as left operand of assignment
    8 |   if((A + B) % 2 = 0 && B > A){
      |      ~~~~~~~~^~~
a.cc:9:15: error: expected primary-expression before '{' token
    9 |   cout << B - {(B - A) / 2};
      |               ^
a.cc:12:20: error: lvalue required as left operand of assignment
   12 |   else if ((A + B) % 2 = 0 && A > B){
      |            ~~~~~~~~^~~
a.cc:13:15: error: expected primary-expression before '{' token
   13 |   cout << A - {(A - B) / 2};
      |               ^
Language: C++

#include <iostream>

int main(void)
{
  int a,b;
  int swap;
	cin >> a >> b;

  if ((a + b) % 2 == 0)
  {
    cout << (a + b) / 2;
  }
  else
  {
  	cout << "IMPOSSIBLE";
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |         cin >> a >> b;
      |         ^~~
      |         std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:11:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |     cout << (a + b) / 2;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:15:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   15 |         cout << "IMPOSSIBLE";
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <iostream>
using namespace std;

int main() {
  int a,b,i=0;
  cin >> a >> b;
  if (a<b) swap(a,b);
  if (a=0||b=0) {
    cout << "IMPOSSIBLE" << endl;
    return 0;
  }
  while (i<a) {
    if ((a-i)*(a-i)=(b-i)*(b-i)) {
      cout << i << endl;
    }
    i++;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:10: error: lvalue required as left operand of assignment
    8 |   if (a=0||b=0) {
      |         ~^~~
a.cc:13:14: error: lvalue required as left operand of assignment
   13 |     if ((a-i)*(a-i)=(b-i)*(b-i)) {
      |         ~~~~~^~~~~~
Language: C++

#include <iostream>
#include <math.h>
#include <vector>
#include <cstdlib>

using namespace std;

int main(int argc, const char * argv[]) {
        int i, j, k;
        int A = 0;
        int B = 0;
        int K = 0;

        scanf("%d %d", &A, &B);

        if(A > B){ k=A;}
        else{ k=B;}

        for(i=0; i<k; i++){
                if(abs(A-i) == abs(B-i)){
                        cout<< i << endl;
                        return 0;
                }
        }

        cout<< IMPOSSIBLE << endl;

        return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:26:16: error: 'IMPOSSIBLE' was not declared in this scope
   26 |         cout<< IMPOSSIBLE << endl;
      |                ^~~~~~~~~~
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
	      int a = sc.nextInt();
	      int b = sc.nextInt();
	      int k;
      
	      if(a == b){
 	  	     System.out.println("IMPOSSIBLE");
          }else if(a < 0){
            System.out.println("IMPOSSIBLE");
          }else if (b > Math.pow(10, 2){
            System.out.println("IMPOSSIBLE");
	      }else{
	        k=(b+a)/2;
			System.out.println(k);
	      } 
	}
}


Compiler output:
Main.java:13: error: ')' expected
          }else if (b > Math.pow(10, 2){
                                       ^
1 error
Language: C++

#include <iosteram>
using namespace std;

int main()
{
  int a, b, k=0;
  cin >> a >> b;
  
  for(k=1;k<1000000000;k++){
    int c=0, d=0;
    if(a>b){
     c=a-k;
     d=b-k;
    }
    else if(a<b){
      c=b-k;
      d=a-k;
    }
    
    if(c==(-d)){
      cout << k;
      return 0;
    }
  }
  cout << "IMPOSSIBLE";
  return 0;
}

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

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main(void)
{
	int a, b,c,d;

	long x,y,z;

	scanf("%d%d", &a, &b);
	
	if (a == 0 || b == 0)printf("IMPOSSIBLE");

	for (x = 0; x < 10000000000;x++) {
		c = a;
		d = b;
		y = c - x;
		z = d - x;
		if (y < 0)y = y * -1;
		if (z < 0)z = z * -1;
		if (y == z) {
			printf("%ld", x);
			break;
		}
		else if (x == 10000000000 && y != z){
			printf("IMPOSSIBLE");
			break;
	}

	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:30:1: error: expected declaration or statement at end of input
   30 | }
      | ^
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
	      int a = sc.nextInt();
	      int b = sc.nextInt();
	      int k;
      
	      if(a == b){
 	  	     System.out.println("IMPOSSIBLE");
          }else if(a < 0){
            System.out.println("IMPOSSIBLE");
          }else if (b > Math.pow(10, 2);
	      }else{
	        k=(b+a)/2;
			System.out.println(k);
	      } 
	}
}


Compiler output:
Main.java:13: error: ')' expected
          }else if (b > Math.pow(10, 2);
                                       ^
Main.java:14: error: illegal start of type
	      }else{
	       ^
Main.java:19: error: class, interface, enum, or record expected
}
^
3 errors
Language: C++

#include<stdio.h>
#include<iostream>

int main(){
    int a,b;
    scanf("%d %d",&a,&b);

    int k;
    int A,B;
    bool flag=false;

    for(int i=0;i<INT_MAX;i++){
        A=std::abs(a-i);
        B=std::abs(b-i);
        if(A==B){
            flag=true;
            k=i;
            break;
        }
    }
    

    if(flag){
        printf("%d\n",k);
    }else{
        printf("%s\n","IMPOSSIBLE");
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:19: error: 'INT_MAX' was not declared in this scope
   12 |     for(int i=0;i<INT_MAX;i++){
      |                   ^~~~~~~
a.cc:3:1: note: 'INT_MAX' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    2 | #include<iostream>
  +++ |+#include <climits>
    3 |
Language: C++

#include<bits/stdc++.h);
using namespace std;
#define ll long long
int main(){
  ll a, b,k;
  cin>>a>> b;
  k=(a+b);
  if(k%2==0){
  	cout<<k/2;
  }
  else 
  	cout<<"IMPOSSIBLE";
 return 0; 
}

Compiler output:
a.cc:1:25: error: missing terminating > character
    1 | #include<bits/stdc++.h);
      |                         ^
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>
using namespace std;
int main(){
    int A,B;
    cin>>A>>B;
    if(A-B>0){
        S=A-B;
    }
    else{
        s=B-A;
    }
    if(S%2==0){
        cout<<S/2;
    }
    else{
         cout<<'IMPOSSIBLE';
    }
    freturn 0;
}


Compiler output:
a.cc:16:16: warning: multi-character literal with 10 characters exceeds 'int' size of 4 bytes
   16 |          cout<<'IMPOSSIBLE';
      |                ^~~~~~~~~~~~
a.cc:1:1: error: 'include' does not name a type
    1 | include<iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:5: error: 'cin' was not declared in this scope
    5 |     cin>>A>>B;
      |     ^~~
a.cc:7:9: error: 'S' was not declared in this scope
    7 |         S=A-B;
      |         ^
a.cc:10:9: error: 's' was not declared in this scope
   10 |         s=B-A;
      |         ^
a.cc:12:8: error: 'S' was not declared in this scope
   12 |     if(S%2==0){
      |        ^
a.cc:13:9: error: 'cout' was not declared in this scope
   13 |         cout<<S/2;
      |         ^~~~
a.cc:16:10: error: 'cout' was not declared in this scope
   16 |          cout<<'IMPOSSIBLE';
      |          ^~~~
a.cc:18:5: error: 'freturn' was not declared in this scope
   18 |     freturn 0;
      |     ^~~~~~~
Language: Java

public class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
      	int a1=a/2;
      	int b1=b/2;
      	int sum=a1+b1;
        if (Math.abs(a-sum) == Math.abs(b-sum)) {
          System.out.println(sum);
        }
      else System.out.println("IMPOSSIBLE");
    }
}


Compiler output:
Main.java:4: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include<bits/stdc++.h)
using namespace std;
#define ll long long
int main(){
  ll a, b,k;
  cin>>a>> b;
  k=(a+b);
  if(k%2==0){
  	cout<<k/2;
  }
  else 
  	cout<<"IMPOSSIBLE";
 return 0; 
}

Compiler output:
a.cc:1:24: error: missing terminating > character
    1 | #include<bits/stdc++.h)
      |                        ^
a.cc:1:9: fatal error: bits/stdc++.h): No such file or directory
    1 | #include<bits/stdc++.h)
      |         ^
compilation terminated.
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int 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 INF 2e9
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;

int inputValue(){
    int a;
    cin >> a;
    return a;
}

void inputArray(int * p, int a){
    REP(i, a){
        cin >> p[i];
    }
}

void inputVector(vector<int> * p, int a){
    REP(i, a){
        int input;
        cin >> input;
        p -> push_back(input);
    }
}

int main()
{
  int A = inputValue();
  int B = inputValue();
  if((B-A) % 2 == 1)
    cout << "IMPOSSIBLE" << endl;
  else{
    int K = (A + B) / 2;
    cout << ans << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:13: error: 'ans' was not declared in this scope; did you mean 'abs'?
   38 |     cout << ans << endl;
      |             ^~~
      |             abs
Language: C++

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

int main(){
  ll a, b, c;
  cin >> a >> b;
  c = a+b;
  if(c % 2) cout << "IMPOSSIBLE\n";
  else cout << c/2 << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'll' was not declared in this scope
    5 |   ll a, b, c;
      |   ^~
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a >> b;
      |          ^
a.cc:6:15: error: 'b' was not declared in this scope
    6 |   cin >> a >> b;
      |               ^
a.cc:7:3: error: 'c' was not declared in this scope
    7 |   c = a+b;
      |   ^
Language: Java

import java.util.Scanner;

public class Main {
	  public static void main(String[] args ) throws Exception {
		Scanner sc = new Scanner(System.in);
	
		int A = sc.nextInt();
		int B = sc.nextInt();
		
		int F = Math.abs(A-B);
		
		int ans = -1;
		
		for(int i = 0;i < 10000000000;i++) {
			if(Math.abs(A-i) == Math.abs(B-i)){
				ans = i;
              break;
			}
		}
		if(ans == -1) {
			System.out.println("IMPOSSIBLE");
		}else {
			System.out.println(ans);
		}
	}
}

Compiler output:
Main.java:14: error: integer number too large
		for(int i = 0;i < 10000000000;i++) {
		                  ^
1 error
Language: C

#include<stdio.h>
#include<stdlib.h>
int main()
{
  int a=0;
  int b=0;
  int sum=0;
  double k=0;
  double x=0;
  scanf("%d%d\n",&a,&b);
  a=abs(a);
  b=abs(b);
  sum=a+b;
  k=sum/2;
  x=ceil(double k);
  if(k==x)
  {
    printf("%f\n",k);
  } else
    printf("IMPOSSIBLE\n");
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:15:5: error: implicit declaration of function 'ceil' [-Wimplicit-function-declaration]
   15 |   x=ceil(double k);
      |     ^~~~
main.c:3:1: note: include '<math.h>' or provide a declaration of 'ceil'
    2 | #include<stdlib.h>
  +++ |+#include <math.h>
    3 | int main()
main.c:15:5: warning: incompatible implicit declaration of built-in function 'ceil' [-Wbuiltin-declaration-mismatch]
   15 |   x=ceil(double k);
      |     ^~~~
main.c:15:5: note: include '<math.h>' or provide a declaration of 'ceil'
main.c:15:10: error: expected expression before 'double'
   15 |   x=ceil(double k);
      |          ^~~~~~
Language: C++

#include <iostream>
using namespace std;
typedef long long ll
int main() {
    ll a = 0, b = 0;
    cin >> a >> b;
    if(a == b) {
        cout << 0 << endl;
    } else {
        ll t = (a + b) >> 1;
        if(t * 2 == a + b) {
            cout << t << endl;
        } else {
            cout << "IMPOSSIBLE" << endl;
        }
    }
    return 0;
}


Compiler output:
a.cc:4:1: error: expected initializer before 'int'
    4 | int main() {
      | ^~~
Language: Java

import java.util.Scanner;
public class a{
        public  static int main(String[] args){
                Scanner sc = new Scanner(System.in);
                int a=sc.nextInt();
                int b=sc.nextInt();
                int c;
                if((a+b)%2==0){
                        c=(a+b)/2;
                        return c;
                }else{
                        System.out.println("IMPOSSIBLE");
                }
                return 0;
        }
}

Compiler output:
Main.java:2: error: class a is public, should be declared in a file named a.java
public class a{
       ^
1 error
Language: C

#include<stdio.h>
#include<stdlib.h>
int main()
{
  int a=0;
  int b=0;
  int sum=0;
  double k=0;
  double x=0;
  scanf("%d%d\n",&a,&b);
  a=abs(a);
  b=abs(b);
  sum=a+b;
  k=sum/2;
  x=double ceil(double k);
  if(k==x)
  {
    printf("%d\n",k);
  } else
    printf("IMPOSSIBLE\n");
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:15:5: error: expected expression before 'double'
   15 |   x=double ceil(double k);
      |     ^~~~~~
Language: Java

import java.util.Scanner;
public class Solution {
	
	
	public static int findK(int x)
	{
		int k= x/2;
		System.out.println(k);
		return k;
	}
	
	public static void main(String[] args)
	{
		Scanner scann = new Scanner(System.in); 
		int a=scann.nextInt();
		int b=scann.nextInt();
		
		
		int x= a+b;
		if(a==b)
			System.out.println("IMPOSSIBLE");
		else if(x%2==1)
			System.out.println("IMPOSSIBLE");
		else
			 findK(x);
			;
			
			

}
}


Compiler output:
Main.java:2: error: class Solution is public, should be declared in a file named Solution.java
public class Solution {
       ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
	int a,b;
  cin >> a >> b;
  if(a+b % 2 == 0){
    cout << (a + b) / 2;
  }
  else if ((a+b) % 2 != 0){
      cout << "IMPOSSIBLE"; << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:29: error: expected primary-expression before '<<' token
   11 |       cout << "IMPOSSIBLE"; << endl;
      |                             ^~
Language: C++

#inlcude <iostream>
typedef long long ll
using namespace std;
int main() {
  ll a = 0, b = 0;
  cin >> a >> b;
  if(a == b) {
    cout << 0 << endl;
  } else {
    int t = (a + b) >> 1;
    if(t * 2 == a + b) {
      cout << t << endl;
    } else {
      cout << "IMPOSSIBLE" << endl;
    }
  }
  return 0;
}


Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude <iostream>
      |  ^~~~~~~
      |  include
a.cc:3:1: error: expected initializer before 'using'
    3 | using namespace std;
      | ^~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'll' was not declared in this scope
    5 |   ll a = 0, b = 0;
      |   ^~
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> a >> b;
      |   ^~~
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a >> b;
      |          ^
a.cc:6:15: error: 'b' was not declared in this scope
    6 |   cin >> a >> b;
      |               ^
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout << 0 << endl;
      |     ^~~~
a.cc:8:18: error: 'endl' was not declared in this scope
    8 |     cout << 0 << endl;
      |                  ^~~~
a.cc:12:7: error: 'cout' was not declared in this scope
   12 |       cout << t << endl;
      |       ^~~~
a.cc:12:20: error: 'endl' was not declared in this scope
   12 |       cout << t << endl;
      |                    ^~~~
a.cc:14:7: error: 'cout' was not declared in this scope
   14 |       cout << "IMPOSSIBLE" << endl;
      |       ^~~~
a.cc:14:31: error: 'endl' was not declared in this scope
   14 |       cout << "IMPOSSIBLE" << endl;
      |                               ^~~~
Language: C++

#include <iostream>
using namespace std;

int main() {
    int A;
    int B;

    cin >> A >> B;
    if ((A+B) % 2)- 
        cout << "IMPOSSIBLE\n";
    else
        cout << (A + B) / 2 << endl;
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: no match for 'operator-' (operand type is 'std::ostream' {aka 'std::basic_ostream<char>'})
    9 |     if ((A+B) % 2)-
      |                   ^
   10 |         cout << "IMPOSSIBLE\n";
      |         ~~~~       
a.cc:9:19: note: candidate: 'operator-(int)' (built-in)
a.cc:9:19: note:   no known conversion for argument 1 from 'std::ostream' {aka 'std::basic_ostream<char>'} to 'int'
In file included from /usr/include/c++/14/string:48,
                 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/stl_iterator.h:618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__y.base() - __x.base())) std::operator-(const reverse_iterator<_Iterator>&, const reverse_iterator<_IteratorR>&)'
  618 |     operator-(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:618:5: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr decltype ((__x.base() - __y.base())) std::operator-(const move_iterator<_IteratorL>&, const move_iterator<_IteratorR>&)'
 1790 |     operator-(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/14/bits/stl_iterator.h:1790:5: note:   candidate expects 2 arguments, 1 provided
Language: C

#include<stdio.h>
#include<math.h>
int main()
{
  int a=0;
  int b=0;
  int sum=0;
  double k=0;
  double x=0;
  scanf("%d%d\n",&a,&b);
  a=abs(a);
  b=abs(b);
  sum=a+b;
  k=sum/2;
  x=double ceil(double k);
  if(K==x)
  {
    printf("%d\n",k);
  } else
    printf("IMPOSSIBLE\n");
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:5: error: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
   11 |   a=abs(a);
      |     ^~~
main.c:3:1: note: include '<stdlib.h>' or provide a declaration of 'abs'
    2 | #include<math.h>
  +++ |+#include <stdlib.h>
    3 | int main()
main.c:15:5: error: expected expression before 'double'
   15 |   x=double ceil(double k);
      |     ^~~~~~
main.c:16:6: error: 'K' undeclared (first use in this function)
   16 |   if(K==x)
      |      ^
main.c:16:6: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#inlcude <iostream>
typedef long long ll;
using namespace std;
int main() {
  ll a = 0, b = 0;
  cin >> a >> b;
  if(a == b) {
    cout << 0 << endl;
  } else {
    int t = (a + b) >> 1;
    if(t * 2 == a + b) {
      cout << t << endl;
    } else {
      cout << "IMPOSSIBLE" << endl;
    }
  }
  return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude <iostream>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> a >> b;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | #inlcude <iostream>
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout << 0 << endl;
      |     ^~~~
a.cc:8:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:8:18: error: 'endl' was not declared in this scope
    8 |     cout << 0 << endl;
      |                  ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | #inlcude <iostream>
a.cc:12:7: error: 'cout' was not declared in this scope
   12 |       cout << t << endl;
      |       ^~~~
a.cc:12:7: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:12:20: error: 'endl' was not declared in this scope
   12 |       cout << t << endl;
      |                    ^~~~
a.cc:12:20: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
a.cc:14:7: error: 'cout' was not declared in this scope
   14 |       cout << "IMPOSSIBLE" << endl;
      |       ^~~~
a.cc:14:7: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:14:31: error: 'endl' was not declared in this scope
   14 |       cout << "IMPOSSIBLE" << endl;
      |                               ^~~~
a.cc:14:31: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: Java

import java.io.*;

public class OnlineTest {

  public static void main(String[] args){

    try{
      String str;
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
      str = br.readLine();
String[] ss = str.split(" ");
      //int sample = Integer.parseInt(str);
      func(Integer.parseInt(ss[0]),Integer.parseInt(ss[1]));
    } catch(IOException e){
      e.printStackTrace();
    }
  }

  public static void func(int a, int b){
    if((a+b)%2 == 0){
System.out.println(Math.abs((a+b)/2));
} else System.out.println("IMPOSSIBLE");
  }
}


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

#include <bits/stdc++.h>

using namespace std;

int main(){
  int a, b;
  cin >> a >> b;
  
  //int k = ( a + b ) / 2;
  int n = ( a + b ) % 2

  if ( n == 0 ){
    cout << ( a + b ) / 2;
  }else {
    cout << "IMPOSSIBLE" << endl;
  }

  return 0;
}

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>
#define int int64_t
using namespace std;
typedef pair<int, int> P;
const int INF = 100000000;
// " ", ' '

// プロトタイプ宣言
// int myfunc(int, vector<vector<int>>);

// グローバル変数

// 関数：

signed main() {
	ios::sync_with_stdio(false);
	cin.tie(0);
	
	int A, B, K;
 	cin >> A >> B;
  
  	if (abs(A-B)%2 = 1) cout << "IMPOSSIBLE";
  	if (A>=0 && B>=0) K = abs(A-B)/2;
  	else if (A>=0 && B<0) K = abs(A-abs(B))/2; 
  	else if (A<0 && B>=0) K = abs(abs(A)-B)/2;
  	else K = abs(abs(A)-abs(B))/2;
  
  	cout << K << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:21: error: lvalue required as left operand of assignment
   22 |         if (abs(A-B)%2 = 1) cout << "IMPOSSIBLE";
      |             ~~~~~~~~^~
Language: C++

#include <iostream>
#include <cmath>
#include <vector>
#include <cstdio>
#include <algorithm>
#include <string>

using namespace std;

typedef long long LL;
typedef unsigned int UI;

#define rSort(a) 		sort(a.rbegin(),a.rend())
#define Sort(a) 		sort(a.begin(),a.end())
#define Reverse(a) 		reverse(a.begin(),a.end())
#define Sum(a)  		accumulate(a.begin(), a.end(), 0)
#define REP(i, n) 		for(UI i = 0;i < n;i++)
#define REPR(i, n) 		for(UI i = n;i >= 0;i--)
#define FOR(i, m, n) 	for(UI i = m;i < n;i++)
#define pb(i) 			push_back(i)

#define MOD  			(LL)1e9 + 7;
#define INF  			(LL)1 << 62;


int _tmain(int argc, char* argv[])
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	LL A,B;

	cin >> A >> B;

	if(fabs((float)A-B) / 2 - abs(A-B) / 2 > 0){
		cout << "IMPOSSIBLE" << endl;
	}else{
		cout << abs(B - abs(A-B) / 2) << endl;
	}

	return 0;
}


Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

#include<iostream>
using namespace std;

int main()
{
  int A,B;
  cin >> A >> B;
  int C = (A+B) % 2;
  
  if(C==0)
    cout << (A+B)/2;
  else
    cout <<"IMPOSSIBLE";
  
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:15:12: error: expected '}' at end of input
   15 |   return 0;
      |            ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

#include<iostream>
using namespace std;

int main() {
	int A;
	int B;
	int K;
	cin >> A >> B;
	if (A = B) {
		K = A;
		for (K = 1;) {
			cout << K << endl;
			K = K - 1;
		}
	}
	else {
		cout << "IMPOSSIBLE" << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:28: error: expected primary-expression before ')' token
   11 |                 for (K = 1;) {
      |                            ^
a.cc:11:28: error: expected ';' before ')' token
   11 |                 for (K = 1;) {
      |                            ^
      |                            ;
Language: C++

#include <iostream>
#include <cmath>
#include <vector>
#include <cstdio>
#include <algorithm>
#include <string>

using namespace std;

typedef long long LL;
typedef unsigned int UI;

#define rSort(a) 		sort(a.rbegin(),a.rend())
#define Sort(a) 		sort(a.begin(),a.end())
#define Reverse(a) 		reverse(a.begin(),a.end())
#define Sum(a)  		accumulate(a.begin(), a.end(), 0)
#define REP(i, n) 		for(UI i = 0;i < n;i++)
#define REPR(i, n) 		for(UI i = n;i >= 0;i--)
#define FOR(i, m, n) 	for(UI i = m;i < n;i++)
#define pb(i) 			push_back(i)

#define MOD  			(LL)1e9 + 7;
#define INF  			(LL)1 << 62;


int _tmain(int argc, _TCHAR* argv[]) 
{
	cin.tie(0);
	ios::sync_with_stdio(false);

	LL A,B;

	cin >> A >> B;

	if(fabs((float)A-B) / 2 - abs(A-B) / 2 > 0){
		cout << "IMPOSSIBLE" << endl;
	}else{
		cout << abs(B - abs(A-B) / 2) << endl;
	}

	return 0;
}


Compiler output:
a.cc:26:22: error: '_TCHAR' has not been declared
   26 | int _tmain(int argc, _TCHAR* argv[])
      |                      ^~~~~~
Language: C++

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

int main(){
  double a, b;
  long long k, i;
  cin >> a >> b;

  if((a%2!=0 && b%2==0) || (a%2==0 && b%2!=0)) cout << "IMPOSSHIBLE" << endl;
  else{
    if(a<b){
      k = ((b-a)/2)+a;
    }else{
      k = ((a-b)/2)+b;
    }
    cout << k << endl;

  }


  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:8: error: invalid operands of types 'double' and 'int' to binary 'operator%'
    9 |   if((a%2!=0 && b%2==0) || (a%2==0 && b%2!=0)) cout << "IMPOSSHIBLE" << endl;
      |       ~^~
      |       | |
      |       | int
      |       double
a.cc:9:18: error: invalid operands of types 'double' and 'int' to binary 'operator%'
    9 |   if((a%2!=0 && b%2==0) || (a%2==0 && b%2!=0)) cout << "IMPOSSHIBLE" << endl;
      |                 ~^~
      |                 | |
      |                 | int
      |                 double
a.cc:9:30: error: invalid operands of types 'double' and 'int' to binary 'operator%'
    9 |   if((a%2!=0 && b%2==0) || (a%2==0 && b%2!=0)) cout << "IMPOSSHIBLE" << endl;
      |                             ~^~
      |                             | |
      |                             | int
      |                             double
a.cc:9:40: error: invalid operands of types 'double' and 'int' to binary 'operator%'
    9 |   if((a%2!=0 && b%2==0) || (a%2==0 && b%2!=0)) cout << "IMPOSSHIBLE" << endl;
      |                                       ~^~
      |                                       | |
      |                                       | int
      |                                       double
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
	      int a = sc.nextInt();
	      int b = sc.nextInt();
	      int k;
      
	      if(a == b){
 	  	     System.out.println("IMPOSSIBLE");
	      }else{
	        k=(b+a)/2;
	 　      System.out.println(k);
	      }        
	}
}


Compiler output:
Main.java:13: error: illegal character: '\u3000'
	 ?      System.out.println(k);
	 ^
1 error
Language: C++

#include<iostream>
using namespace std;

int main() {
	int A;
	int B;
	int K;
	cin >> A >> B;
	if (A = B) {
		K = A;
		for (K = 1) {
			cout << K << endl;
			K = K - 1;
		}
	}
	else {
		cout << "IMPOSSIBLE" << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:27: error: expected ';' before ')' token
   11 |                 for (K = 1) {
      |                           ^
      |                           ;
a.cc:15:9: error: expected primary-expression before '}' token
   15 |         }
      |         ^
a.cc:14:18: error: expected ';' before '}' token
   14 |                 }
      |                  ^
      |                  ;
   15 |         }
      |         ~         
a.cc:15:9: error: expected primary-expression before '}' token
   15 |         }
      |         ^
a.cc:14:18: error: expected ')' before '}' token
   14 |                 }
      |                  ^
      |                  )
   15 |         }
      |         ~         
a.cc:11:21: note: to match this '('
   11 |                 for (K = 1) {
      |                     ^
a.cc:15:9: error: expected primary-expression before '}' token
   15 |         }
      |         ^
Language: C++


def main():
	a, b = [int(f) for f in input().split()]
	
	c = (a + b) / 2
	if c.is_integer():
		print(int(c))
	else:
		print("IMPOSSIBLE") 


if __name__ == "__main__":
	main()

Compiler output:
a.cc:2:1: error: 'def' does not name a type
    2 | def main():
      | ^~~
Language: Java

import java.util.Scanner;

public class A {
	public static void main(String[] args){

		Scanner sc = new Scanner(System.in);
		double a = sc.nextInt();
		double b = sc.nextInt();

		double k;

		if(a==b) {
			System.out.println("0");
		}else {
			k=(a*a-b*b)/(2*a-2*b);
			if(k%1==0) {
				System.out.println((int)k);
			}else {
				System.out.print("IMPOSSIBLE");
			}
		}

	}
}


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

#include <bits/stdc++.h>
using namespace std;
 
int a,b;
cin>>a>>b;
if ((a+b)%2==0) { 
    cout<<(a+b)/2<<endl;
}
else {
    cout<<"IMPOSSIBLE"<<endl;
}

Compiler output:
a.cc:5:1: error: 'cin' does not name a type
    5 | cin>>a>>b;
      | ^~~
a.cc:6:1: error: expected unqualified-id before 'if'
    6 | if ((a+b)%2==0) {
      | ^~
a.cc:9:1: error: expected unqualified-id before 'else'
    9 | else {
      | ^~~~
Language: C++

#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cin >> a >> b;
    if ((a+b)%2) {
      cout << "IMPOSSIBLE"
    } else {
      cout << (a+b)/2;
    }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:27: error: expected ';' before '}' token
    8 |       cout << "IMPOSSIBLE"
      |                           ^
      |                           ;
    9 |     } else {
      |     ~
Language: C++

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

int main(){

 long long  A,B;
 cin>>A>>B;
int c=abs(A-B)
if (c%2==0)  {
cout<<(A+B)/2;
return 0;
}

cout<<"IMPOSSIBLE";
return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:1: error: expected ',' or ';' before 'if'
    9 | if (c%2==0)  {
      | ^~
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){

      int a = sc.nextInt();
      int b = sc.nextInt();
      int k;
      
      if(a == b){
        System.out.println("IMPOSSIBLE");
      }else if(a < b){
        // a-k<0, b-k>0
        k=(b+a)/2;
         System.out.println(k);
      }
        
	}
}

Compiler output:
Main.java:5: error: cannot find symbol
      int a = sc.nextInt();
              ^
  symbol:   variable sc
  location: class Main
Main.java:6: error: cannot find symbol
      int b = sc.nextInt();
              ^
  symbol:   variable sc
  location: class Main
2 errors
Language: C++

#include<iostream>
using namespace std;

int main(){
    int a,b;
    cin >> a >> b;
    if((a+b)%2==0){
        cout << (a+b)/2 << endl;
    }else{
        cout << "IMPOSSIBLE"　<< endl;
    }
    return 0;
}

Compiler output:
a.cc:10:17: error: extended character 　 is not valid in an identifier
   10 |         cout << "IMPOSSIBLE"　<< endl;
      |                 ^
a.cc: In function 'int main()':
a.cc:10:17: error: unable to find string literal operator 'operator""\U00003000' with 'const char [11]', 'long unsigned int' arguments
   10 |         cout << "IMPOSSIBLE"　<< endl;
      |                 ^~~~~~~~~~~~~~
Language: Java

import java.util.Scanner;

public class Main {
	public static void solution(int x, int y) {
		if((x+y)%2==0) {
			System.out.prtintln((x+y)%2);
		}
		else {
			System.out.println("IMPOSSIBLE");
		}
	}
		
	
	public static void main(String args []) {
		Scanner obj = new Scanner(System.in);
		int x = obj.nextInt();
		int y = obj.nextInt();
		solution(x,y);
	}
}

Compiler output:
Main.java:6: error: cannot find symbol
			System.out.prtintln((x+y)%2);
			          ^
  symbol:   method prtintln(int)
  location: variable out of type PrintStream
1 error
Language: C

#include<stdio.h>

int main(){

int a,b,k;
double d;
scanf("%d %d",&a,&b);

if(a-b!=0){
d=(a*a)-(b*b);
d=d/(2*(a-b));
k=(int)d;
if(k==d)printf("%d",k);
else{printf("IMPOSSIBLE");}
return 0;

}


Compiler output:
main.c: In function 'main':
main.c:17:1: error: expected declaration or statement at end of input
   17 | }
      | ^
Language: Java

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int a = sc.nextInt();
		int b = sc.nextInt();
		int k = (a+b)/2;
		
		if((a+b)%2 == 0) {
			System.out.println(k);
		}else {
			System.out.println("IMPOSSIBLE");
		}
	}
}

Compiler output:
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
		Scanner sc = new Scanner(System.in);
		                 ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: C++

#include<iostream>
using namespace std;

int main(){
    int a,b;
    cin >> a >> b;
    if((A+B)%2==0){
        cout << (A+B)/2 << endl;
    }else{
        cout << "IMPOSSIBLE"　<< endl;
    }
    return 0;
}

Compiler output:
a.cc:10:17: error: extended character 　 is not valid in an identifier
   10 |         cout << "IMPOSSIBLE"　<< endl;
      |                 ^
a.cc: In function 'int main()':
a.cc:7:9: error: 'A' was not declared in this scope
    7 |     if((A+B)%2==0){
      |         ^
a.cc:7:11: error: 'B' was not declared in this scope
    7 |     if((A+B)%2==0){
      |           ^
a.cc:10:17: error: unable to find string literal operator 'operator""\U00003000' with 'const char [11]', 'long unsigned int' arguments
   10 |         cout << "IMPOSSIBLE"　<< endl;
      |                 ^~~~~~~~~~~~~~
Language: C++

#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cin >> a >> b;
    if ((a+b)%2) {
      cout << 'IMPOSSIBLE'
    } else {
      cout << (a+b)/2;
    }
}

Compiler output:
a.cc:8:15: warning: multi-character literal with 10 characters exceeds 'int' size of 4 bytes
    8 |       cout << 'IMPOSSIBLE'
      |               ^~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:8:27: error: expected ';' before '}' token
    8 |       cout << 'IMPOSSIBLE'
      |                           ^
      |                           ;
    9 |     } else {
      |     ~
Language: Java

import java.util.Scanner;

public class main {
	public static void Main(String[] args) {
		Scanner sc = new Scanner(System.in);
	
		int A = sc.nextInt();
		int B = sc.nextInt();
		
		int F = Math.abs(A-B);
		
		int ans = -1;
		
		for(int i = 0;i < F;i++) {
			if((A-i) == (B-i)){
				ans = i;
			}
		}
		if(ans == -1) {
			System.out.println("IMPOSSHIBLE");
		}else {
			System.out.println(ans);
		}
	}
}

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

#include<stdio.h>

int main(){

int a,b,k;
double d;
scanf("%d %d",&a,&b);

if(a-b!==0){
d=(a*a)-(b*b);
d=d/(2(a-b));
k=(int)d;
if(k==d)printf("%d",k);
else{printf("IMPOSSIBLE");}
return 0;

}


Compiler output:
main.c: In function 'main':
main.c:9:9: error: expected expression before '=' token
    9 | if(a-b!==0){
      |         ^
main.c:11:6: error: called object is not a function or function pointer
   11 | d=d/(2(a-b));
      |      ^
main.c:17:1: error: expected declaration or statement at end of input
   17 | }
      | ^
Language: C++

#include<stdio.h>
#include<iostream>
#include<algorithm>
#include<string>
#include<string.h>
#include<math.h>
#include<stdlib.h>
#include<vector>
#include<queue>
using namespace std;

int a,b;
cin>>a>>b;
if((a+b)%2==0){
    cout<<(a+b)/2<<endl;
}
else {
    cout<<"IMPOSSIBLE"<<endl;
}

Compiler output:
a.cc:13:1: error: 'cin' does not name a type
   13 | cin>>a>>b;
      | ^~~
a.cc:14:1: error: expected unqualified-id before 'if'
   14 | if((a+b)%2==0){
      | ^~
a.cc:17:1: error: expected unqualified-id before 'else'
   17 | else {
      | ^~~~
Language: C++

#include<iostream>
using namespace std;
int main()
{
    int a,b;
    cin >> b >> c;
    if ((a+b)%2) {
      cout << 'IMPOSSIBLE'
    } else {
      cout << (a+b)/2;
    }
}

Compiler output:
a.cc:8:15: warning: multi-character literal with 10 characters exceeds 'int' size of 4 bytes
    8 |       cout << 'IMPOSSIBLE'
      |               ^~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:6:17: error: 'c' was not declared in this scope
    6 |     cin >> b >> c;
      |                 ^
a.cc:8:27: error: expected ';' before '}' token
    8 |       cout << 'IMPOSSIBLE'
      |                           ^
      |                           ;
    9 |     } else {
      |     ~
Language: Java

public class Main {
	public static void solution(int x, int y) {
		if((x+y)%2==0) {
			System.out.prtintln((x+y)/2);
		}
		else {
			System.out.println("IMPOSSIBLE");
		}
	}
		
	
	public static void main(String args []) {
		Scanner obj = new Scanner(System.in);
		int x = obj.nextInt();
		int y = obj.nextInt();
		solution(x,y);
	}
}

Compiler output:
Main.java:4: error: cannot find symbol
			System.out.prtintln((x+y)/2);
			          ^
  symbol:   method prtintln(int)
  location: variable out of type PrintStream
Main.java:13: error: cannot find symbol
		Scanner obj = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class Main
Main.java:13: error: cannot find symbol
		Scanner obj = new Scanner(System.in);
		                  ^
  symbol:   class Scanner
  location: class Main
3 errors
Language: C

include<stdio.h>

int main(){

int a,b,k;
double d;
scanf("%d %d",&a,&b);

if(a-b!==0){
d=(a*a)-(b*b);
d=d/(2(a-b));
k=(int)d;
if(k==d)printf("%d",k);
else{printf("IMPOSSIBLE");}
return 0;

}

Compiler output:
main.c:1:8: error: expected '=', ',', ';', 'asm' or '__attribute__' before '<' token
    1 | include<stdio.h>
      |        ^
Language: Java

import java.io.*;

public class OnlineTest {

  public static void main(String[] args){

    try{
      String str;
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in, "UTF-8"));
      str = br.readLine();
      //int sample = Integer.parseInt(str);
      System.out.println(sample);
    } catch(IOException e){
      e.printStackTrace();
    }
  }

  public static int func(int a, int b){
    return Math.abs(b-a);
  }
}

Compiler output:
Main.java:3: error: class OnlineTest is public, should be declared in a file named OnlineTest.java
public class OnlineTest {
       ^
Main.java:12: error: cannot find symbol
      System.out.println(sample);
                         ^
  symbol:   variable sample
  location: class OnlineTest
2 errors
Language: Java

public class codeforces {
	public static void solution(int x, int y) {
		if((x+y)%2==0) {
			System.out.prtintln((x+y)/2);
		}
		else {
			System.out.println("IMPOSSIBLE");
		}
	}
		
	
	public static void main(String args []) {
		Scanner obj = new Scanner(System.in);
		int x = obj.nextInt();
		int y = obj.nextInt();
		solution(x,y);
	}
}

Compiler output:
Main.java:1: error: class codeforces is public, should be declared in a file named codeforces.java
public class codeforces {
       ^
Main.java:4: error: cannot find symbol
			System.out.prtintln((x+y)/2);
			          ^
  symbol:   method prtintln(int)
  location: variable out of type PrintStream
Main.java:13: error: cannot find symbol
		Scanner obj = new Scanner(System.in);
		^
  symbol:   class Scanner
  location: class codeforces
Main.java:13: error: cannot find symbol
		Scanner obj = new Scanner(System.in);
		                  ^
  symbol:   class Scanner
  location: class codeforces
4 errors
Language: C++

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

int main(){
  longlong a, b, k, i;
  cin >> a >> b;

  if((a%2==1 && b%2==0) || (a%2==0 && b%2==1)) cout << "IMPOSSHIBLE" << endl;
  else{
    if(a<b){
      k = ((b-a)/2)+a;
    }else{
      k = ((a-b)/2)+b;
    }
    cout << k << endl;

  }


  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'longlong' was not declared in this scope
    5 |   longlong a, b, k, i;
      |   ^~~~~~~~
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a >> b;
      |          ^
a.cc:6:15: error: 'b' was not declared in this scope
    6 |   cin >> a >> b;
      |               ^
a.cc:11:7: error: 'k' was not declared in this scope
   11 |       k = ((b-a)/2)+a;
      |       ^
a.cc:13:7: error: 'k' was not declared in this scope
   13 |       k = ((a-b)/2)+b;
      |       ^
a.cc:15:13: error: 'k' was not declared in this scope
   15 |     cout << k << endl;
      |             ^