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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:24: error: expected ';' before 'cout'
    7 |   if(((a+b)/2)*2==(a+b)
      |                        ^
      |                        ;
    8 |      cout<<abs(b-(a+b)/2);
      |      ~~~~               
a.cc:9:6: error: expected primary-expression before 'else'
    9 |      else
      |      ^~~~
a.cc:8:27: error: expected ')' before 'else'
    8 |      cout<<abs(b-(a+b)/2);
      |                           ^
      |                           )
    9 |      else
      |      ~~~~                  
a.cc:7:5: note: to match this '('
    7 |   if(((a+b)/2)*2==(a+b)
      |     ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
  int A;
  int B;
  
  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:10:16: warning: division by zero [-Wdiv-by-zero]
   10 |   if ( (A+B)/2 %= 0) {
      |        ~~~~~~~~^~~~
a.cc:10:13: error: lvalue required as left operand of assignment
   10 |   if ( (A+B)/2 %= 0) {
      |        ~~~~~^~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:7: error: expected primary-expression before '|' token
   11 |   if (|A-K|==|B-K|) {
      |       ^
a.cc:11:13: error: expected primary-expression before '=' token
   11 |   if (|A-K|==|B-K|) {
      |             ^
a.cc:11:14: error: expected primary-expression before '|' token
   11 |   if (|A-K|==|B-K|) {
      |              ^
a.cc:11:19: error: expected primary-expression before ')' token
   11 |   if (|A-K|==|B-K|) {
      |                   ^
Language: C++

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

int main() {
  int A ,B, K, L, S;
  cin >> A >> B;
  K = A+B;
  L = K%2;
  S = K/2;
  if (L == 0){
      cout << S;
  }
  else {
      cout << "IMPOSSIBLE"
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:27: error: expected ';' before '}' token
   14 |       cout << "IMPOSSIBLE"
      |                           ^
      |                           ;
   15 |   }
      |   ~
Language: C++

#include <iostream>

int main(int argc, char** argv)
{
    int A, B;
    std::cin >> A >> B;

    int k;
    bool a = ((A%2+B%2)%2==0);
    if (a!) {
        std::cout << "IMPOSSIBLE" << std::endl;
    }
    else {
        std::cout << ((A + B) / 2) std::endl;
    }

    return 0;
}

Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:10:10: error: expected ')' before '!' token
   10 |     if (a!) {
      |        ~ ^
      |          )
a.cc:14:35: error: expected ';' before 'std'
   14 |         std::cout << ((A + B) / 2) std::endl;
      |                                   ^~~~
      |                                   ;
Language: C

#include<stdio.h>
int main()
{
  long long int a,b,c,des;
  scanf("%lld %lld",&a,&b);
  if(b>a)
    des=b-a;
  else
    des=a-b;
  if(des%2==1)
    printf("IMPOSSIBLE\n");
  else
  {
    if(b>a)
    	c=a+des/2;
    else
      	c=b+des/2;
    printf("%d\n",c);
  }

Compiler output:
main.c: In function 'main':
main.c:19:3: error: expected declaration or statement at end of input
   19 |   }
      |   ^
Language: C

#include<stdio.h>
int main()
{
  long long int a,b,c,des;
  scanf("%lld %lld",&a,&b);
  if(b>a)
    des=b-a;
  else
    des=a-b;
  if(des%2==1)
    printf("IMPOSSIBLE\n");
  else
  {
    if(b>a)
    	c=a+des/2;
    ekse
      	c=b+des/2;
    printf("%d\n",c);
  }
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:16:5: error: unknown type name 'ekse'
   16 |     ekse
      |     ^~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){

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


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: fixed-point types not supported in C++
   10 |   if(a+b==2k){
      |           ^~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){

  int a,b,k;
  cin >> a >> b;
  
  if(a+b-2*k ==09){
    cout << k << endi;
  }else {
    cout << "IMPOSSIBLE" << endl;
  }
}

Compiler output:
a.cc:10:16: error: invalid digit "9" in octal constant
   10 |   if(a+b-2*k ==09){
      |                ^~
a.cc: In function 'int main()':
a.cc:11:18: error: 'endi' was not declared in this scope
   11 |     cout << k << endi;
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){

  int a,b,k;
  cin >> a >> b;
  
  if(a+b-2*k ==09{
    cout << k << endi;
  }else {
    cout << "IMPOSSIBLE" << endl;
  }
}

Compiler output:
a.cc:10:16: error: invalid digit "9" in octal constant
   10 |   if(a+b-2*k ==09{
      |                ^~
a.cc: In function 'int main()':
a.cc:10:18: error: expected ')' before '{' token
   10 |   if(a+b-2*k ==09{
      |     ~            ^
      |                  )
a.cc:15:1: error: expected primary-expression before '}' token
   15 | }
      | ^
Language: C++

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

int main(){
  int a,b;
  cin>>a>>b;
  double c=(a+b)/2;
  if(c%1!=0){
    cout <<"IMPOSSIBLE"<<endl;
  }
  else{
    cout <<c<<endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:7: error: invalid operands of types 'double' and 'int' to binary 'operator%'
   10 |   if(c%1!=0){
      |      ~^~
      |      | |
      |      | int
      |      double
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for(int i = 0; i < (int)(n); i++)
int main() {
    // ifstream in("data.txt");
    // cin.rdbuf(in.rdbuf());
    int A, B;
    cin >> A >> B;

    if(A % 2 == B % 2) {
        cout << "IMPOSSIBLE" << endl;
    } else {
        cout << (x + y) / 2 << endl;
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:18: error: 'x' was not declared in this scope
   13 |         cout << (x + y) / 2 << endl;
      |                  ^
a.cc:13:22: error: 'y' was not declared in this scope
   13 |         cout << (x + y) / 2 << endl;
      |                      ^
Language: C++

#include <iostream>

using namespace std;

int main()
{
    int a,b,sum=0,q=0;
    cin>>a>>b;
    if(|a|!=|b|)
    {
        sum=(|a|+|b|)%2;
        q=(|a|+|b|)/2;
        if(sum==0)
        {
            cout<<q;
        }
        else
            cout<<"impossible";
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:8: error: expected primary-expression before '|' token
    9 |     if(|a|!=|b|)
      |        ^
a.cc:9:11: error: expected primary-expression before '!=' token
    9 |     if(|a|!=|b|)
      |           ^~
a.cc:9:13: error: expected primary-expression before '|' token
    9 |     if(|a|!=|b|)
      |             ^
a.cc:9:16: error: expected primary-expression before ')' token
    9 |     if(|a|!=|b|)
      |                ^
a.cc:11:14: error: expected primary-expression before '|' token
   11 |         sum=(|a|+|b|)%2;
      |              ^
a.cc:11:18: error: expected primary-expression before '|' token
   11 |         sum=(|a|+|b|)%2;
      |                  ^
a.cc:11:21: error: expected primary-expression before ')' token
   11 |         sum=(|a|+|b|)%2;
      |                     ^
a.cc:12:12: error: expected primary-expression before '|' token
   12 |         q=(|a|+|b|)/2;
      |            ^
a.cc:12:16: error: expected primary-expression before '|' token
   12 |         q=(|a|+|b|)/2;
      |                ^
a.cc:12:19: error: expected primary-expression before ')' token
   12 |         q=(|a|+|b|)/2;
      |                   ^
Language: C++

#include <iostream>

using namespace std;

int main() {
    ios_base::sync_with_stdio(0); cin.tie(0);
 
    ll A, B; cin >> A >> 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:8:5: error: 'll' was not declared in this scope
    8 |     ll A, B; cin >> A >> B;
      |     ^~
a.cc:8:21: error: 'A' was not declared in this scope
    8 |     ll A, B; cin >> A >> B;
      |                     ^
a.cc:8:26: error: 'B' was not declared in this scope
    8 |     ll A, B; cin >> A >> B;
      |                          ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: lvalue required as left operand of assignment
    8 | if((a+b)%2=0)
      |    ~~~~~^~
Language: C++

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

int main(void) {
  int A,B;
  cin >> A >> B;
  if((A+B) % 2 == 0) {
    cout << (A+B) / 2 << endl;
  }else if((A+B)%2 == 1) {
    cout << "IMPOSSIBLE " << endl;
  }
}

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

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

Compiler output:
main.c:1:9: fatal error: bits/stdc++.h: No such file or directory
    1 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: Java

import java.util.*;

public class Harmony {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a, b;

        a = sc.nextInt();
        b = sc.nextInt();
        sc.close();

        int k;

        for (k = 0; k < 1000000000; k++) {
            if (Math.abs(a - k) == Math.abs(b - k)) {
                System.out.println(k);
                return;
            }
        }
        System.out.println("IMPOSSIBLE");
    }
}


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

import java.util.Scanner;

public class Harmony {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a, b;

        a = sc.nextInt();
        b = sc.nextInt();
        sc.close();

        int k;

        for (k = 0; k < 1000000000; k++) {
            if (Math.abs(a - k) == Math.abs(b - k)) {
                System.out.println(k);
                return;
            }
        }
        System.out.println("IMPOSSIBLE");
    }
}


Compiler output:
Main.java:3: error: class Harmony is public, should be declared in a file named Harmony.java
public class Harmony {
       ^
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<< endl;
    }
    else {
       cout<<"IMPOSSIBLE"<<endl;
    }
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:8:20: error: expected ';' before '}' token
    8 |       cout << (a+b)//2<< endl;
      |                    ^
      |                    ;
    9 |     }
      |     ~
Language: Java

public class Harmony {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        int a, b;

        a = sc.nextInt();
        b = sc.nextInt();
        sc.close();

        int k;

        for (k = 0; k < 1000000000; k++) {
            if (Math.abs(a - k) == Math.abs(b - k)) {
                System.out.println(k);
                return;
            }
        }
        System.out.println("IMPOSSIBLE");
    }
}

Compiler output:
Main.java:1: error: class Harmony is public, should be declared in a file named Harmony.java
public class Harmony {
       ^
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Harmony
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Harmony
3 errors
Language: C++

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

struct point{
    int x, y;
    point(int x = 0, int y = 0) : x(x), y(y) {}
};

void answer(vector<point>& vec, int size, bool x, bool y, bool s){
    cout << (int)vec.size() << endl;
    for(point p : vec){
        if(s)swap(p.x, p.y);
        if(y)p.y = -p.y;
        if(x)p.x = -p.x;
        cout << p.x << ' ' << p.y << endl;
    }
}

int main(){

    int K, X, Y;
    cin >> K >> X >> Y;

    bool xnegative = false;
    if(X < 0){
        X = -X;
        xnegative = true;
    }
    bool ynegative = false;
    if(Y < 0){
        Y = -Y;
        ynegative = true;
    }
    bool swapped = false;
    if(X < Y){
        swap(X, Y);
        swapped = true;
    }

    int D = X + Y;
    if(K % 2 == 0 and D % 2 == 1){
        cout << -1 << endl;
        return 0;
    }

    int step = 0;

    if(D < K and D % 2 == 1){
        return 0;
    } else {
        if(D < K and D % 2 == 0)step = 2;
        else if(((K - D % K) % K) % 2 == 0)step = (D + K - 1) / K;
        else step = ((D + K - 1) / K) + 1;
        int down = (D - K * step) / 2;
        point now(0, 0);
        while(now.y - K >= down){
            now.y -= K;
        }
        now.x = K - (now.y - down);
        now.y = down;
        while(now.x + K <= X){
            now.x += K;
        }
        now.y = down + K - (X - now.x);
        now.x = X;
        ans.push_back(now);
        int tmp = (Y - now.y) / K;
        assert(tmp * K + now.y == Y); //ここまではREにならない
        rep(i, tmp){
            now.y = now.y + K;
            ans.push_back(now);
        }
        assert(now.y == Y); //ここでRE
    
        return 0;
    }

}


Compiler output:
a.cc: In function 'int main()':
a.cc:71:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
   71 |         ans.push_back(now);
      |         ^~~
      |         abs
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: lvalue required as left operand of assignment
    8 |   if (c%2=0) cout << c/2;
      |       ~^~
Language: C++

#include<iosteream>
using namespace std
int main(){
  long long 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:1:9: fatal error: iosteream: No such file or directory
    1 | #include<iosteream>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
int main()
{
  int a,b;
  cin >> a >> b;
  if(abs(b-a)%2)
    return 0*cout << "IMPOSSIBLE" << endl;
  cout << min(a,b)+abs(b-a)/2;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> a >> b;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:14: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |     return 0*cout << "IMPOSSIBLE" << endl;
      |              ^~~~
      |              std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:7:38: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |     return 0*cout << "IMPOSSIBLE" << endl;
      |                                      ^~~~
      |                                      std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:8:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |   cout << min(a,b)+abs(b-a)/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:8:11: error: 'min' was not declared in this scope; did you mean 'std::min'?
    8 |   cout << min(a,b)+abs(b-a)/2;
      |           ^~~
      |           std::min
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: 'std::min' declared here
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
Language: C++

#include<bits/stdc++.h>
#define rep(i,n) for(int i=0;i<(int)n;i++)
#define all(c) (c).begin(),(c).end()
#define pb push_back
#define dbg(...) do{cerr<<__LINE__<<": ";dbgprint(#__VA_ARGS__, __VA_ARGS__);}while(0);

using namespace std;

namespace std{template<class S,class T>struct hash<pair<S,T>>{size_t operator()(const pair<S,T>&p)const{return ((size_t)1e9+7)*hash<S>()(p.first)+hash<T>()(p.second);}};template<class T>struct hash<vector<T>>{size_t operator()(const vector<T> &v)const{size_t h=0;for(auto i : v)h=h*((size_t)1e9+7)+hash<T>()(i)+1;return h;}};}
template<class T>ostream& operator<<(ostream &os, const vector<T> &v){os<<"[ ";rep(i,v.size())os<<v[i]<<(i==v.size()-1?" ]":", ");return os;}template<class T>ostream& operator<<(ostream &os,const set<T> &v){os<<"{ "; for(const auto &i:v)os<<i<<", ";return os<<"}";}
template<class T,class U>ostream& operator<<(ostream &os,const map<T,U> &v){os<<"{";for(const auto &i:v)os<<" "<<i.first<<": "<<i.second<<",";return os<<"}";}template<class T,class U>ostream& operator<<(ostream &os,const pair<T,U> &p){return os<<"("<<p.first<<", "<<p.second<<")";}
void dbgprint(const string &fmt){cerr<<endl;}template<class H,class... T>void dbgprint(const string &fmt,const H &h,const T&... r){cerr<<fmt.substr(0,fmt.find(","))<<"= "<<h<<" ";dbgprint(fmt.substr(fmt.find(",")+1),r...);}
typedef long long ll;typedef vector<int> vi;typedef pair<int,int> pi;const int inf = (int)1e9;const double INF = 1e12, EPS = 1e-9;

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

Compiler output:
a.cc:20:35: warning: missing terminating " character
   20 |                 cout << IMPOSSIBLE" << endl;
      |                                   ^
a.cc:20:35: error: missing terminating " character
   20 |                 cout << IMPOSSIBLE" << endl;
      |                                   ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:20:25: error: 'IMPOSSIBLE' was not declared in this scope
   20 |                 cout << IMPOSSIBLE" << endl;
      |                         ^~~~~~~~~~
Language: C++

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

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

 if(A % 2 != B % 2) {
cout << "IMPOSSIBLE" << endl;
 }
  else {
cout << (A + B) / 2 << endl; 
} 
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'A' was not declared in this scope
    8 |  if(A % 2 != B % 2) {
      |     ^
a.cc:8:14: error: 'B' was not declared in this scope
    8 |  if(A % 2 != B % 2) {
      |              ^
Language: Java

public class Main{

    

        
    

    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long[] ms = new long[n+1];
        long[] hs = new long[n];

        for(int i=0;i<n+1;i++){
            ms[i] = sc.nextLong();
        }
        
        for(int i=0;i<n;i++){
            hs[i] = sc.nextLong();
        }

        long tot = 0;
        long min;

        for(int i = n;i>=0;i--){
            
            if(i<=n-1){
                min = Math.min(ms[i],hs[i]);
                ms[i] -= min;
                hs[i] -= min;
                tot += min;
            }
            

            if(i > 0){
                min = Math.min(ms[i],hs[i-1]);
                ms[i] -= min;
                hs[i-1] -= min;
                tot += min;
            }
            
        }

      
        System.out.println(tot);



        sc.close();
    }
}

Compiler output:
Main.java:9: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:9: 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;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: 'IMPOSSIBLE' was not declared in this scope
    8 |   else cout<<IMPOSSIBLE<<endl;
      |              ^~~~~~~~~~
Language: C++

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

int main (){
  int a,b,ret = 0;
  cin >> a>> b;
  if((a-b)%2 == 1)
    cout << "IMMPOSIBLE";
  else{
    
    cout << abs((a+b)/2);
    }
  }
  return 0;
}


Compiler output:
a.cc:15:3: error: expected unqualified-id before 'return'
   15 |   return 0;
      |   ^~~~~~
a.cc:16:1: error: expected declaration before '}' token
   16 | }
      | ^
Language: C++

#include <iostream>
#include <cstdlib>

int main (){
  int a,b,ret = 0;
  cin << a<< b;
  if(abs(a) == abs(b))
    cout >> ret;
  else{
    if(abs(b) < abs(a)){
      int h;
    h=a;a=b;b=h;
    }
  do{
    a--;b--;ret++;
  }while(abs(a) != abs(b) && abs(a)  <abs(b));
    if(abs(b) < abs(a))
      cout >>"IMPPOSIBLE";
    else cout >> ret;
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin << 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:8:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |     cout >> ret;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |       cout >>"IMPPOSIBLE";
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:19:10: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |     else cout >> ret;
      |          ^~~~
      |          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>
#include <cstdlib>

int main (){
  int a,b,ret = 0;
  cin >> a>> b;
  if(abs(a) == abs(b))
    cout << ret;
  else{
    if(abs(b) < abs(a)){
      int h;
    h=a;a=b;b=h;
    }
  do{
    a--;b--;ret++;
  }while(abs(a) != abs(b) && abs(a)  <abs(b));
    if(abs(b) < abs(a))
      cout <<"IMPPOSIBLE";
    else cout << ret;
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> 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:8:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |     cout << ret;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |       cout <<"IMPPOSIBLE";
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:19:10: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |     else cout << ret;
      |          ^~~~
      |          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>
#include <cstdlib>

int main (){
  int a,b,ret = 0;
  cin >> a>> b;
  if(abs(a) == abs(b))
    cout << ret;
  else{
    if(abs(b) < abs(a)){
      int h;
    h=a;a=b;b=h;
    }
  do{
    a--;b--;ret++;
  }while(abs(a) != abs(b) && abs(a)  <abs(b));
    if(abs(b) < abs(a))
      cout <<"IMPPOSIBLE";
    else cout << ret;
  }
  return 0;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> 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:8:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |     cout << ret;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |       cout <<"IMPPOSIBLE";
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:19:10: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 |     else cout << ret;
      |          ^~~~
      |          std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(void){
  long long int x,y;
  cin>>x>>y;
  cout<<(((x+y)&1LL)?"IMPOSSIBLE":(x+y)/2LL)<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:21: error: operands to '?:' have different types 'const char*' and 'long long int'
    6 |   cout<<(((x+y)&1LL)?"IMPOSSIBLE":(x+y)/2LL)<<endl;
      |          ~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(void){
  long long int x,y;
  cin>>x>>y;
  cout<<(((x+y)&1)?"IMPOSSIBLE":(x+y)/2)<<endl;
  return ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:19: error: operands to '?:' have different types 'const char*' and 'long long int'
    6 |   cout<<(((x+y)&1)?"IMPOSSIBLE":(x+y)/2)<<endl;
      |          ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
a.cc:7:3: error: return-statement with no value, in function returning 'int' [-fpermissive]
    7 |   return ;
      |   ^~~~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: lvalue required as left operand of assignment
    7 |   if((a+b)%2=0) cout<<(a+b)/2;
      |      ~~~~~^~
Language: C++

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

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inclede; did you mean #include?
    1 | #inclede <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 | #inclede <iostream>
a.cc:7:18: error: 'cout' was not declared in this scope
    7 |   if((a+b)%2==0) cout<<(a+b)/2;
      |                  ^~~~
a.cc:7:18: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:8:8: error: 'cout' was not declared in this scope
    8 |   else cout<<"IMPOSSIBLE";
      |        ^~~~
a.cc:8:8: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

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


Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inclede; did you mean #include?
    1 | #inclede <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 | #inclede <iostream>
a.cc:7:11: error: lvalue required as left operand of assignment
    7 |   if((a+b)%2=0) cout<<(a+b)/2;
      |      ~~~~~^~
a.cc:7:17: error: 'cout' was not declared in this scope
    7 |   if((a+b)%2=0) cout<<(a+b)/2;
      |                 ^~~~
a.cc:7:17: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:8:8: error: 'cout' was not declared in this scope
    8 |   else cout<<"IMPOSSIBLE";
      |        ^~~~
a.cc:8:8: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

// #include <iostream>
// #include <string>
// #include <math.h>
// #include <map>
// #include <vector>
// #include <tuple>
// #include <algorithm>
// #include <queue>
#include<bits/stdc++.h>
using namespace std;
#define lli long long int
#define vi vector<int>
#define vlli vector<lli>
#define pii pair<int, int>
#define plli pair <lli, lli>
#define F(i,n) for(lli (i)=0;(i)<(n);(i)++)
#define FR(i,n) for(lli (i)=(n)-1;(i)>=0;(i)--)
#define FSG(i,a,b) for(lli (i)=(a);(i)<(b);(i)++)
#define FSGR(i,a,b) for(lli (i)=(b)-1;(i)>=(a);(i)--)
#define VAL(n) cout << n << endl;
#define VALD(n) cout << #n << ": " << n << endl;
void remove(std::vector<T>& vector, unsigned int index)
{
    vector.erase(vector.begin() + index);
}
int main(){
  int a, b;
  cin >> a >> b;
  int big = max(a, b);
  int sm = min(a, b);
  if((big - sm)%2 == 0){
    cout << (big - sm) / 2 << endl;
  }
  else{
    cout << "IMPOSSIBLE" << endl;
  }
  return 0;
}


Compiler output:
a.cc:22:25: error: 'T' was not declared in this scope
   22 | void remove(std::vector<T>& vector, unsigned int index)
      |                         ^
a.cc:22:26: error: template argument 1 is invalid
   22 | void remove(std::vector<T>& vector, unsigned int index)
      |                          ^
a.cc:22:26: error: template argument 2 is invalid
a.cc: In function 'void remove(int&, unsigned int)':
a.cc:24:12: error: request for member 'erase' in 'vector', which is of non-class type 'int'
   24 |     vector.erase(vector.begin() + index);
      |            ^~~~~
a.cc:24:25: error: request for member 'begin' in 'vector', which is of non-class type 'int'
   24 |     vector.erase(vector.begin() + index);
      |                         ^~~~~
Language: Java


public class Main{
    public static void main(String[] args){
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        if(a == b) {
            System.out.print("0");
        }
        else{
            int max = Math.max(a,b);
            int min = Math.min(a,b);
            if((max-min) % 2 == 0){
                System.out.print((max-min)/2);
            }
            else{
                System.out.print("IMPOSSIBLE");
            }
            
        }
        scan.close();
    }
}

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

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'S' was not declared in this scope
    7 |   S = (A + B)/2;
      |   ^
Language: C++

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

int main() {
  int a, b;
  cin >> a >> b;
  if((a - b) % 2 = 1)
    cout << "IMPOSSIBLE" << endl;
  else
    cout << (a + b) / 2 << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: lvalue required as left operand of assignment
    7 |   if((a - b) % 2 = 1)
      |      ~~~~~~~~^~~
Language: C++

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

int main(){
	int n,m;
  	cin >> n >> m;
  	cout <<(n+m%2?(n+m)/2:"IMPOSSIBLE")<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: operands to '?:' have different types 'int' and 'const char*'
    7 |         cout <<(n+m%2?(n+m)/2:"IMPOSSIBLE")<< endl;
      |                 ~~~~~^~~~~~~~~~~~~~~~~~~~~
Language: C++

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

int main()
{
  cin >> a >> b;
  if (a % 2 == b % 2) cout << (a + b) / 2 << '\n';
  else cout << "IMPOSSIBLE\n";
}


Compiler output:
a.cc: In function 'int main()':
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;
      |               ^
Language: C++

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

int main()
{
#ifdef LOCAL
    // 以降 cin の入力元が 'xxx.txt' になる
    std::ifstream in("in.txt");
    std::cin.rdbuf(in.rdbuf());
#endif

    int A, B;
    cin >> A >> B;

    int K = 0;

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

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:33: error: expected ';' before '}' token
   25 |             cout << "IMPOSSIBLE"
      |                                 ^
      |                                 ;
   26 |         }
      |         ~
Language: C++

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

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


Compiler output:
a.cc:8:1: error: extended character   is not valid in an identifier
    8 |     int a, b; cin >> a >> b;
      | ^
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc:8:1: error: extended character   is not valid in an identifier
a.cc: In function 'int main()':
a.cc:8:1: error: '\U000000a0\U000000a0\U000000a0\U000000a0int' was not declared in this scope
    8 |     int a, b; cin >> a >> b;
      | ^~~~~~~
a.cc:8:22: error: 'a' was not declared in this scope
    8 |     int a, b; cin >> a >> b;
      |                      ^
a.cc:8:27: error: 'b' was not declared in this scope
    8 |     int a, b; cin >> a >> b;
      |                           ^
Language: C++

#include<bits/stdc++.h>

#define ll long long
#define vi vector<int>
#define vc vector<char>
#define vt vector<string>
#define si set<int>
#define sc set<char>
#define st set<string>
#define pii pair<int,int>
#define fi first
#define se second
#define pb push_back;

using namespace std;
int main()
{
    int a,b;
    cin>>a>>b;
    cout<<(((b-a)&1)?"IMPOSSIBLE":(b-a)/2);
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:20:21: error: operands to '?:' have different types 'const char*' and 'int'
   20 |     cout<<(((b-a)&1)?"IMPOSSIBLE":(b-a)/2);
      |            ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b;
  long long int i=0;
  for(i=0;i<(a>b?a:b);i++){
    if(abs(a-i)==abs(b-i)){
      cout << i << endl;
      return 0;
    }
  }
  cout << "IMPOSSIBLE"

}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:23: error: expected ';' before '}' token
   12 |   cout << "IMPOSSIBLE"
      |                       ^
      |                       ;
   13 | 
   14 | }
      | ~
Language: Java

import java.util.*;
public class test9 {
public static void main(String args[])
{
  Scanner sp=new Scanner(System.in);
   int a=sp.nextInt();
    int b=sp.nextInt();
    int l=0;
     int n=0;
    if(a<b)
    {
        l=b;
    }
    else
    {
        l=a;
    }
   for(int k=0;k<l;k++)
   {
      if(Math.abs(a-k)==Math.abs(b-k))
       {
           n=k;
       }
      
   }
   if(!(n==0))
   {
       System.out.println(n);
   }
   else{
       System.out.println("IMPOSSIBLE");
   }
   
   

}
}


Compiler output:
Main.java:2: error: class test9 is public, should be declared in a file named test9.java
public class test9 {
       ^
1 error
Language: C++

#include <stdio.h>
#include <cmath.h>
using namespace srd;

int main(){
  int A,B;
  cin >> A >> B;
  int K = abs(A - B);
  if(abs(A - K) == abs (B - K)){
    cout << K << endl;
    return 0;
  }else{
    cout << "IMPOSSIBLE" << endl;
    return 0;
}


Compiler output:
a.cc:2:10: fatal error: cmath.h: No such file or directory
    2 | #include <cmath.h>
      |          ^~~~~~~~~
compilation terminated.
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: expected '}' at end of input
   11 |     cout<<"IMPOSSIBLE";
      |                        ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: expected '}' at end of input
   11 |     cout<<"IMPOSSIBLE";
      |                        ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:25: error: lvalue required as left operand of assignment
    6 |   if((max(A,B)-min(A,B))%2=0){
      |      ~~~~~~~~~~~~~~~~~~~^~
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{
    cout<<"IMPOSSIBLE";
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: lvalue required as left operand of assignment
    6 |   if((A-B)%2=0){
      |      ~~~~~^~
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: warning: division by zero [-Wdiv-by-zero]
    6 |   if(A*B%=0){
      |      ~~~^~~
a.cc:6:7: error: lvalue required as left operand of assignment
    6 |   if(A*B%=0){
      |      ~^~
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: expected primary-expression before '=' token
    6 |   if(A*B%==0){
      |           ^
Language: C

#include<stdio.h>
int main(void){
  int a,b;
  scanf("%d %d",&a,&b);
  if((a+b)%2==1){
    printf("impossible");
  }else{
    printf("%d",(a+b)2);
  }
}

Compiler output:
main.c: In function 'main':
main.c:8:22: error: expected ')' before numeric constant
    8 |     printf("%d",(a+b)2);
      |           ~          ^
      |                      )
Language: C++

#include <iostream>
using namespace std;
#include <cmath>
int main (){
  int a, b,i = 0,j = 0;
  cin >> a >> b;
  if(a > b){
    j = a;
    a = b;
    b = j;
    j = 0;
  }
    
  for(i = 0; j == 0;i++){
    a--;
    b--;
    if(abs(a) == abs(b)){
      cout << i;
      j = 1;
    }
    else if(abs(a) > abs(b)){
      cout << "IMPOSSIBLE";
      j++;
    }
 
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:27:2: error: expected '}' at end of input
   27 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main (){
      |            ^
Language: C++

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

int main() {
    long long A, B;
    cin >> A >> B;

    if ((A + B)/2 == 0) {
        cout << (A + B)/2 <<endl;
    }
    else {
        cout << "IMPOSSIBLE" <<endl;
    }
    retutn0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'retutn0' was not declared in this scope
   14 |     retutn0;
      |     ^~~~~~~
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 <<endl;
    }
    else {
        cout << "IMPOSSIBLE" <<endl;
    }
    retutn0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'retutn0' was not declared in this scope
   14 |     retutn0;
      |     ^~~~~~~
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();
        if(a+b % 2){
            System.out.println((a+b)/2);
        }else{
            System.out.println("IMPOSSIBLE");
        }
        
    }
}

Compiler output:
Main.java:8: error: incompatible types: int cannot be converted to boolean
        if(a+b % 2){
            ^
1 error
Language: C++

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

#define repr(i,a,b) for(int i=a, i##_len=(b); i<i##_len; ++i)
#define rep(i,n) for(int i=0, i##_len=(n); i<i##_len; ++i)
#define irepr(i,a,b) for(int i=a, i##_len=(b); i>=i##_len; --i)
#define irep(i,n) for(int i=n, i>=0; --i)

#define printline(str) cout << str << "\n"

#define lint longlong

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  int A, B;
  cin >> A >> B;
  if( abs(A-B)%2 != 0){
    printline("IMPOSSIBLE");
    return;
  }

  printline(abs(A+B)/2);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:5: error: return-statement with no value, in function returning 'int' [-fpermissive]
   20 |     return;
      |     ^~~~~~
Language: C++

#include "bits/stdc++.h"
using namespace std;
#define fast ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0)
#define ll long long int
#define int ll
//#define slld(t) scanf("%lld",&t)
//#define sd(t) scanf("%d",&t)
//#define pd(t) printf("%d\n",t)
//#define plld(t) printf("%lld\n",t)
#define vec vector < int >
#define vecp vector < pair < int , int > >
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define debug(x)   cerr<<#x<<": "<<x<<endl
#define pii pair < int , int >
#define pll pair < ll , ll > 
#define debug(x)   cerr<<#x<<": "<<x<<endl
// #define mod  1000000007
#define N 102
// #define MAX 200005
#define mod1 1000000007
#define mod2 998244353
#define bitcnt __builtin_popcount
#define PI acos(-1)
//#define endl "\n"
const int inf = (int)1e18 + 10;
signed main(){
  fast;
  int a , b;
   cin >> a >> b;
   if(a == b){
    cout << 1 << endl;
   }
   else{
    int c = ( a + b);
    if(c%2 == 0){
      cout << (c/2) << endl;
    else
      cout << "IMPOSSIBLE\n";
    }
   }

}	

Compiler output:
a.cc: In function 'int main()':
a.cc:40:5: error: expected '}' before 'else'
   40 |     else
      |     ^~~~
a.cc:38:17: note: to match this '{'
   38 |     if(c%2 == 0){
      |                 ^
a.cc: At global scope:
a.cc:45:1: error: expected declaration before '}' token
   45 | }
      | ^
Language: C++

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

int main(){
  int a,b;
  cin >> a >> b;
  if((a+b)%2==1)
    cout << "IMPOSSIBLE";
  else
    cout << (a+b)/2;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #iclude; did you mean #include?
    1 | #iclude <bits/stdc++.h>
      |  ^~~~~~
      |  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 | #iclude <bits/stdc++.h>
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout << "IMPOSSIBLE";
      |     ^~~~
a.cc:8:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout << (a+b)/2;
      |     ^~~~
a.cc:10:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#iclude <bits/stdc++.h>
usin namespace std;

int main(){
  int a,b;
  cin >> a >> b;
  if((a+b)%2==1)
    cout << "IMPOSSIBLE";
  else
    cout << (a+b)/2;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #iclude; did you mean #include?
    1 | #iclude <bits/stdc++.h>
      |  ^~~~~~
      |  include
a.cc:2:1: error: 'usin' does not name a type
    2 | usin namespace std;
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> a >> b;
      |   ^~~
a.cc:8:5: error: 'cout' was not declared in this scope
    8 |     cout << "IMPOSSIBLE";
      |     ^~~~
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout << (a+b)/2;
      |     ^~~~