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

#inlcude <stdio.h>

int main(){
  int A,B,;
  scanf "%d %d",&A,&B);
  
  if( (A+B)%2==0 ){
    printf("%d\n",(A+B)/2);
  }else{
    printf("IMPOSSIBLE\n");
  }
  return 0;
}

Compiler output:
main.c:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude <stdio.h>
      |  ^~~~~~~
      |  include
main.c: In function 'main':
main.c:4:11: error: expected identifier or '(' before ';' token
    4 |   int A,B,;
      |           ^
main.c:5:3: error: 'scanf' undeclared (first use in this function)
    5 |   scanf "%d %d",&A,&B);
      |   ^~~~~
main.c:5:3: note: each undeclared identifier is reported only once for each function it appears in
main.c:5:8: error: expected ';' before string constant
    5 |   scanf "%d %d",&A,&B);
      |        ^~~~~~~~
      |        ;
main.c:5:22: error: expected statement before ')' token
    5 |   scanf "%d %d",&A,&B);
      |                      ^
main.c:8:5: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    8 |     printf("%d\n",(A+B)/2);
      |     ^~~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'printf'
  +++ |+#include <stdio.h>
    1 | #inlcude <stdio.h>
main.c:8:5: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
    8 |     printf("%d\n",(A+B)/2);
      |     ^~~~~~
main.c:8:5: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:10:5: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
   10 |     printf("IMPOSSIBLE\n");
      |     ^~~~~~
main.c:10:5: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C

#include <stdio.h>

int main(){
  int A,B;
  scanf("%d %d",&A,&B);
  
  int K;
  
  if( (A+B)%2==0){
    printf("%d\n",(A+B)/2);
  }else{
    printf("IMPOSSIBLE\n")
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:27: error: expected ';' before '}' token
   12 |     printf("IMPOSSIBLE\n")
      |                           ^
      |                           ;
   13 |   }
      |   ~
Language: C

#include<stdio.h>

int main(){
  int A,B;
  scanf("%d %d",&A,$B);
        
  if((A+B)%2==0){
    printf("%d\n",(A+B)/2);
  }else{
    printf(impossible);
  }
  return 0；
｝    

Compiler output:
main.c: In function 'main':
main.c:5:20: error: '$B' undeclared (first use in this function); did you mean 'B'?
    5 |   scanf("%d %d",&A,$B);
      |                    ^~
      |                    B
main.c:5:20: note: each undeclared identifier is reported only once for each function it appears in
main.c:10:12: error: 'impossible' undeclared (first use in this function)
   10 |     printf(impossible);
      |            ^~~~~~~~~~
main.c:12:10: error: invalid suffix "；" on integer constant
   12 |   return 0；
      |          ^~~
main.c:12:13: error: expected ';' before '\U0000ff5d'
   12 |   return 0；
      |             ^
      |             ;
   13 | ｝
      | ~~           
main.c:13:1: error: expected declaration or statement at end of input
   13 | ｝
      | ^~
Language: C

#include <stdio.h>

int main(){
  int A,B;
  scanf("%d %d",&A,&B);
  
  int K;
  
  if( (A+B)%2==0){
    printf("%d\n",(A+B)/2);
  }else{
    printf("IMPOOSSIBLE\n")
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:28: error: expected ';' before '}' token
   12 |     printf("IMPOOSSIBLE\n")
      |                            ^
      |                            ;
   13 |   }
      |   ~
Language: C

#include<stdio.h>

int main(){
  int A,B;
  scanf("%d %d",&A,$B);
        
  if((A+B)%2==0){
    printf("%d\n",(A+B)/2);
  }else{
    printf();
  }
  return 0；
｝    

Compiler output:
main.c: In function 'main':
main.c:5:20: error: '$B' undeclared (first use in this function); did you mean 'B'?
    5 |   scanf("%d %d",&A,$B);
      |                    ^~
      |                    B
main.c:5:20: note: each undeclared identifier is reported only once for each function it appears in
main.c:10:5: error: too few arguments to function 'printf'
   10 |     printf();
      |     ^~~~~~
In file included from main.c:1:
/usr/include/stdio.h:363:12: note: declared here
  363 | extern int printf (const char *__restrict __format, ...);
      |            ^~~~~~
main.c:12:10: error: invalid suffix "；" on integer constant
   12 |   return 0；
      |          ^~~
main.c:12:13: error: expected ';' before '\U0000ff5d'
   12 |   return 0；
      |             ^
      |             ;
   13 | ｝
      | ~~           
main.c:13:1: error: expected declaration or statement at end of input
   13 | ｝
      | ^~
Language: C

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
int main()
{
    int A,B,K,res1,res2;
    scanf("%d %d",&A, &B);
    K = (A+B)/2;
    res1 = abs(A-K);
    res2 = abs(B-K);
    if(abs(A-K) == abs(B-K)){
        printf("\n%d\n",K);
        if(K < pow(10,5))
        printf("|%d-%d| = %d and |%d-%d| = %d, so %d satisfies the condition.\n",A,K, res1,B,K,res2,K);
    }else if(abs(A-K) != abs(B-K)){
        printf("IMPOSSIBLE\n);
        printf("No integer satisfies the condition.\n");
    }else
    exit(0);
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:16:16: warning: missing terminating " character
   16 |         printf("IMPOSSIBLE\n);
      |                ^
main.c:16:16: error: missing terminating " character
   16 |         printf("IMPOSSIBLE\n);
      |                ^~~~~~~~~~~~~~~
main.c:17:56: error: expected ')' before ';' token
   17 |         printf("No integer satisfies the condition.\n");
      |                                                        ^
      |                                                        )
main.c:16:15: note: to match this '('
   16 |         printf("IMPOSSIBLE\n);
      |               ^
main.c:17:9: error: passing argument 1 of 'printf' makes pointer from integer without a cast [-Wint-conversion]
   17 |         printf("No integer satisfies the condition.\n");
      |         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      |         |
      |         int
In file included from main.c:1:
/usr/include/stdio.h:363:43: note: expected 'const char * restrict' but argument is of type 'int'
  363 | extern int printf (const char *__restrict __format, ...);
      |                    ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
main.c:17:57: error: expected ';' before '}' token
   17 |         printf("No integer satisfies the condition.\n");
      |                                                         ^
      |                                                         ;
   18 |     }else
      |     ~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:13:11: error: unable to find string literal operator 'operator""endl' with 'const char [11]', 'long unsigned int' arguments
   13 |     cout<<"IMPOSSIBLE"endl;
      |           ^~~~~~~~~~~~~~~~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:31: error: operands to '?:' have different types 'int' and 'const char*'
    7 |   cout << (((a + b) % 2 == 0) ? (a + b) / 2 : "IMPOSSIBLE") << endl;
      |            ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
Language: C

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


Compiler output:
main.c:1:9: fatal error: iostream: No such file or directory
    1 | #include<iostream>
      |         ^~~~~~~~~~
compilation terminated.
Language: C++

//nani?
#include<bits/stdc++.h>
#define pi acos(-1);
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define f(i,a,b) for( int i = a; i < b ; i++ )
#define sor(a) sort( a.begin(), a.end() )
#define rsor(a) sort( a.rbegin(), a.rend() )
#define fastio ios_base::sync_with_stdio(0);cin.tie(0)
//#define inf 1LL<<62
typedef long long ll;
typedef double ld;
using namespace std;
const ll inf=1e10+6;
const ll MOD=1e9+7;
const ll mod=998244353;
// ac cmtr;
const int MAX_N = 1e6+5;
const int LG = 25;

#define TRACE
#ifdef TRACE
#define trace(...) __f(#__VA_ARGS__, __VA_ARGS__)
template <typename Arg1>
void __f(const char* name, Arg1&& arg1) {
  cout << name << " : " << arg1 << endl;}
 
template <typename Arg1, typename... Args>
void __f(const char* names, Arg1&& arg1, Args&&... args) {
  const char* comma = strchr(names + 1, ',');
  cout.write(names, comma - names) << " : " << arg1<<" | ";
  __f(comma+1, args...);}
#else
#define trace(...)
#endif
//---------------------------

ll a[MAX_N];

int main(){
    fastio;
    ll a,b;
    cin>>a>>b;
    if((a+b)&1) cout<<(a+b)/2<<endl;
    else cout<<"IMPOSSIBLE"

}






Compiler output:
a.cc: In function 'int main()':
a.cc:47:28: error: expected ';' before '}' token
   47 |     else cout<<"IMPOSSIBLE"
      |                            ^
      |                            ;
   48 | 
   49 | }
      | ~
Language: C

#include <stdio.h>

int main() {
int A, B;
scanf("%d %d", &A,&B);
int sum = A + B;
if (sum % 2 == 0) {
  printf("%d", & sum/2);
  } else {
  printf("IMPOSSIBLE")
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:21: error: invalid operands to binary / (have 'int *' and 'int')
    8 |   printf("%d", & sum/2);
      |                ~~~~~^
      |                |
      |                int *
main.c:10:23: error: expected ';' before '}' token
   10 |   printf("IMPOSSIBLE")
      |                       ^
      |                       ;
   11 |   }
      |   ~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: lvalue required as left operand of assignment
   11 |    if (c%2=!0) {
      |        ~^~
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main(){
        long long  a,b;
        int k;

        cin >> a >> b;

        k = (a + b) / 2;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:18:10: error: expected '}' at end of input
   18 |         }
      |          ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:32: error: 'edml' was not declared in this scope
    9 |   else cout << "IMPOSSIBLE" << edml;
      |                                ^~~~
Language: C

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cassert>
#include <algorithm>
#include <numeric>
#include <random>
#include <vector>
#include <array>
#include <bitset>
#include <queue>
#include <set>
#include <unordered_set>
#include <map>
#include <unordered_map>
 
using namespace std;
using uint = unsigned int;
using ll = long long;
using ull = unsigned long long;

int main() {
    ll a, b;
    cin >> a >> b;
    for(ll i = 0; i <= a; i++){
        if(abs(a-i) == abs(b-i)){
            cout << i;
            return 0;
        }
    }
    cout << "IMPOSSIBLE";
    return 0;
}

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

#include <bits/stdc++.h>
using namespace std;
int main()
{
	ll a, b;
	scanf("%lld%lld", &a, &b);
	if(a % 2 != b % 2) printf("Impossible\n");
	else {
		int ans = (a + b) / 2;
		printf("%d\n", ans);
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'll' was not declared in this scope
    5 |         ll a, b;
      |         ^~
a.cc:6:28: error: 'a' was not declared in this scope
    6 |         scanf("%lld%lld", &a, &b);
      |                            ^
a.cc:6:32: error: 'b' was not declared in this scope
    6 |         scanf("%lld%lld", &a, &b);
      |                                ^
Language: C++

#include <iosream>

using namespace std;

int main(){
  int a, b;
  
  int diff = abs(a - b);
  
  if(diff % 2 == 0){
    cout << diff / 2 << endl;
  }
  else{
    cout << "IMPOSSIBLE" << endl;
  }
}

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

#include<bist/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:1:9: fatal error: bist/stdc++.h: No such file or directory
    1 | #include<bist/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++h>
using namespace std;
int main(){
    long long int a,b,ans;
    cin >> a >> b ;
    ans=(a+b)/2 ;
    cout  << ans << endl;
    return 0;
}

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>
using namespace std;
int main(){
    long long int a,b,ans;
    cin >> a >> b ;
    cout  << (a+b)/2 << endl;
    return 0;
}

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++

// https://leetcode.com/problems/count-complete-tree-nodes/

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

#define forn(i, n) for (int i=0; i < (int)n; i++)
#define fora(x, arr) for(auto& x:arr)
using matrix = std::vector<vector<int>>;
using ll = long long;


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

	ll a, b; cin >> a >> b;

	if (a > b) int max = a;
	else int max = b;

	ll x = abs(a-b);
	ll z = x >> 1;

	for (ll i = z; i <= x+max; i++) {

		if (abs(a-i) == abs(b-i)) {
			cout << i;
			return 0;
		}

	}

	cout << "IMPOSSIBLE";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:30: error: invalid operands of types 'll' {aka 'long long int'} and '<unresolved overloaded function type>' to binary 'operator+'
   24 |         for (ll i = z; i <= x+max; i++) {
      |                             ~^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
#define lvector vector<ll>
#define cvector vector<char>
#define svector vector<string>
#define lque queue<ll>
#define lpque priority_queue<ll>
#define dlpque priority_queue<ll,lvector,greater<ll>>
#define P pair<ll,ll>
#define ALL(a) a.begin(),a.end()
#define RALL(a) a.rbegin(),a.rend()
#define rep(i,n) for(ll i=0; i<n; ++i)
#define print(a) cout << (a) << endl

int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  ll a,b;cin>>a>>b;
  if(a!=b) print(0);
  else print(((a+b)%2==0)?(a+b)/2:"IMPOSSIBLE");
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:26: error: operands to '?:' have different types 'long long int' and 'const char*'
   21 |   else print(((a+b)%2==0)?(a+b)/2:"IMPOSSIBLE");
      |              ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
a.cc:14:27: note: in definition of macro 'print'
   14 | #define print(a) cout << (a) << endl
      |                           ^
Language: C++

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;
int main()
{
          ll a,b
          cin>>a>>b;
          if(a%2!=b%2)cout<<"IMPOSSIBLE"<<endl;
          else 
                    cout<<(a+b)/2<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: expected initializer before 'cin'
    8 |           cin>>a>>b;
      |           ^~~
a.cc:9:19: error: 'b' was not declared in this scope
    9 |           if(a%2!=b%2)cout<<"IMPOSSIBLE"<<endl;
      |                   ^
Language: C++

#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
#include<map>
#include<set>
#include<string>
#include<queue>
#include<stack>
#include<iomanip>

#define fast_io ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

using namespace std;

#define debug(x) cout<<(#x)<<"="<<(x)<<", ";
#define debug1(x) debug(x) cout<<'\n';
#define debug2(x1, x2) debug(x1) debug(x2) cout<<'\n';
#define debug3(x1, x2, x3) debug(x1) debug(x2) debug(x3) cout<<'\n';
#define debug4(x1, x2, x3, x4) debug(x1) debug(x2) debug(x3) debug(x4) cout<<'\n';
#define debug5(x1, x2, x3, x4, x5) debug(x1) debug(x2) debug(x3) debug(x4) debug(x5) cout<<'\n';

#define fcout cout<<fixed<<setprecision(15)
#define repp(i,j,k) for(int i=j; i<k; ++i)
#define rep(i,j) repp(i,0,j)
#define rrep(i,j,k) for(int i=j; i>=k; --i)
#define all(x) (x).begin(), (x).end()
#define sort(x) sort(x.begin(), x.end())
#define lb(x,val) lower_bound(x.begin(), x.end(), val)
#define ub(x,val) upper_bound(x.begin(), x.end(), val)
#define pb(x) emplace_back(x);

typedef long long int lli;
typedef pair<int,int> pii;
typedef pair<lli,lli> pll;
typedef vector<int> vi;
typedef vector<lli> vl;
typedef tuple<int, int, lli> tiil;

//const lli M=998244353ll;
const lli M=1000000007ll;
const double D=1.0;

int main(){
	fast_io
	int a,b; cin>>a>>b;
	double d=(a+b)/(2*D);
	if(ceil(d)==floor(d)) cout<<ceil(d)
	else cout<<"IMPOSSIBLE";
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:48:44: error: expected ';' before 'else'
   48 |         if(ceil(d)==floor(d)) cout<<ceil(d)
      |                                            ^
      |                                            ;
   49 |         else cout<<"IMPOSSIBLE";
      |         ~~~~
Language: C++

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

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

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

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'll' was not declared in this scope
    5 |   ll a,b; cin>>a>>b;
      |   ^~
a.cc:5:16: error: 'a' was not declared in this scope
    5 |   ll a,b; cin>>a>>b;
      |                ^
a.cc:5:19: error: 'b' was not declared in this scope
    5 |   ll a,b; cin>>a>>b;
      |                   ^
Language: C

#include <iostream>

int main(void) {
  int A,B,ans,X;
  scanf("%d %d",&A ,&B);
  ans=A+B;
  X=(A+B)/2;
  if(ans%2==0)
  printf("%d\n",X);
  else 
  printf("Impossible");

  return 0;
}

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

#include <stdio.h>

int main(void) {
    int A, B;
       scanf("%d ,%d",&A ,&B);
     if ((A+B)%2==0)
      printf("%d",(A+B)/2);
      else
      printf("IMPOSSIBLE");





  
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:16:12: error: expected '}' at end of input
   16 |   return 0;
      |            ^
a.cc:3:16: note: to match this '{'
    3 | int main(void) {
      |                ^
Language: C++

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

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


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

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

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

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=1)
      |      ~~~~~^~
a.cc:12:2: error: expected '}' at end of input
   12 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
int A;
 cin >> A;
vector<int> B(A);
for(int i = 0;i < A;i++){
cin >> A[i];
}
 int count = 0;
for(int i = 0;i < A;i++){
  if(A[i] != i + 1){
    count++;
  }
}
 if(count <= 2){
   cout << "YES" << endl;
 }
 if(count > 2){
   cout << "NO"
 }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: invalid types 'int[int]' for array subscript
    9 | cin >> A[i];
      |         ^
a.cc:13:7: error: invalid types 'int[int]' for array subscript
   13 |   if(A[i] != i + 1){
      |       ^
a.cc:21:16: error: expected ';' before '}' token
   21 |    cout << "NO"
      |                ^
      |                ;
   22 |  }
      |  ~
Language: C++

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

int main() {
int A;
 cin >> A;
vector<int> B(A);
for(int i = 0;i < A;i++){
cin >> A[i];
}
 int count = 0;
for(int i = 0;i < (int)n;i++){
  if(A[i] != i + 1){
    k++;
  }
}
 if(count <= 2){
   cout << "YES" << endl;
 }
 if(count > 2){
   cout << "NO"
 }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: invalid types 'int[int]' for array subscript
    9 | cin >> A[i];
      |         ^
a.cc:12:24: error: 'n' was not declared in this scope
   12 | for(int i = 0;i < (int)n;i++){
      |                        ^
a.cc:13:7: error: invalid types 'int[int]' for array subscript
   13 |   if(A[i] != i + 1){
      |       ^
a.cc:14:5: error: 'k' was not declared in this scope
   14 |     k++;
      |     ^
a.cc:21:16: error: expected ';' before '}' token
   21 |    cout << "NO"
      |                ^
      |                ;
   22 |  }
      |  ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  cin >> S;
  int A = S.size();
  int count = 0;
  
  for(int i= 0;i < A;i++){
    if(S[i] == i + 1){
      count++;
    }
    
    if(count < 3){
      cout << "YES" << endl;
    }
    
    if(count > 2){
      cout << "NO" << endl;
    }
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:22:4: error: expected '}' at end of input
   22 |   }
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  cin >> S;
  int A = S.(size);
  int count = 0;
  
  for(int i= 0;i < A;i++){
    if(S[i] == i + 1){
      count++;
    }
    
    if(i < 3){
      cout << "YES" << endl;
    }
    
    if(i > 2){
      cout << "NO" << endl;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: expected unqualified-id before '(' token
    7 |   int A = S.(size);
      |             ^
a.cc:21:4: error: expected '}' at end of input
   21 |   }
      |    ^
a.cc:10:26: note: to match this '{'
   10 |   for(int i= 0;i < A;i++){
      |                          ^
a.cc:21:4: error: expected '}' at end of input
   21 |   }
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C

#include<stdio.h>
int main()
{
int A,B,X,Y;
scanf("%d %d",&A,&B);
X=A+B;
if(X%2==0)
{
Y=X/2;
printf("%d\n |%d-%d|=%d and |%d-%d|=%d , so %d satisfies the condition",Y,A,Y,Y-A,B,Y,B-Y,Y);
}
else
{
printf("IMPOSSIBLE\n No integer satisfies the condition") 
}


return 0;
}

Compiler output:
main.c: In function 'main':
main.c:14:58: error: expected ';' before '}' token
   14 | printf("IMPOSSIBLE\n No integer satisfies the condition")
      |                                                          ^
      |                                                          ;
   15 | }
      | ~
Language: C++

#include <iostream>

using namespace std;

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





	return 0;										
}


Compiler output:
a.cc:11:10: error: expected unqualified-id before 'else'
   11 |         }else{
      |          ^~~~
a.cc:19:9: error: expected unqualified-id before 'return'
   19 |         return 0;
      |         ^~~~~~
a.cc:20:1: error: expected declaration before '}' token
   20 | }
      | ^
Language: C++

#include <bits\stdc++.h>

using namespace std;

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





	return 0;										
}


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

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

int main(){
  long long 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:10:14: error: 'A' was not declared in this scope
   10 |     cout << (A + B) / 2 << endl;
      |              ^
a.cc:10:18: error: 'B' was not declared in this scope
   10 |     cout << (A + B) / 2 << endl;
      |                  ^
Language: C++

#include<algorithm>//sort,二分探索,など
#include<bitset>//固定長bit集合
#include<cmath>//pow,logなど
#include<complex>//複素数
#include<deque>//両端アクセスのキュー
#include<functional>//sortのgreater
#include<iomanip>//setprecision(浮動小数点の出力の誤差)
#include<iostream>//入出力
#include<iterator>//集合演算(積集合,和集合,差集合など)
#include<map>//map(辞書)
#include<numeric>//iota(整数列の生成),gcdとlcm(c++17)
#include<queue>//キュー
#include<set>//集合
#include<stack>//スタック
#include<string>//文字列
#include<unordered_map>//イテレータあるけど順序保持しないmap
#include<unordered_set>//イテレータあるけど順序保持しないset
#include<utility>//pair
#include<vector>//可変長配列

// vectorの重複削除
// std::sort(test.begin(), test.end());
// test.erase(std::unique(test.begin(), test.end()), test.end());

using namespace std;
using ll = long long;
using P = pair<int, int>; // vector<P> ba(n); みたいな感じですぐ使える ba[i] = P(a, b); make_pairをしなくてもいい
// typedef vector<int> v;
template <class T>ostream &operator<<(ostream &o,const vector<T>&v){o<<"{";for(int i=0;i<(int)v.size();i++)o<<(i>0?", ":"")<<v[i];o<<"}";return o;}
#define debug(v) {cerr<<"\033[1;36m[debug]\033[m "<<#v<<" : "<<v<<endl;}
#define rep(i, c) for(int i = 0; i < int(c); i++)
#define ALL(x) (x).begin(), (x).end() //sort(ALL(obj))みたいな
#define SIZE(x) ((ll)(x).size()) //sizeをsize_tからllに直しておく
#define MAX(x) *max_element(ALL(x)) //最大値
#define pb push_back //
// const int MOD = 1000000007;
// string alpha="ABCDEFGHIJKLMNOPQRSTUVWXYZ";
// printf("%.20f\n", ans); あれ
// const double PI = 3.141592653589793238462643383;

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


Compiler output:
a.cc: In function 'int main()':
a.cc:46:23: error: expected ';' before ')' token
   46 |     cout << abs(a+b)/2) << endl;
      |                       ^
      |                       ;
Language: C++

#include <stdio.h>

int main(void) {
	// your code goes here
	int a, b, k;
	scanf("%d %d", &a, &b);
	k = (a+b)/2;
	int tm1, tm2;
	tm1 = abs(a-k);
	tm2 = abs(b-k); 
	if(tm1 == tm2){
	printf("%d\n", k);
	}
	else {
		printf("IMPOSSIBLE\n");
	}
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: 'abs' was not declared in this scope
    9 |         tm1 = abs(a-k);
      |               ^~~
Language: C

#include<bits/stdc++.h>

using namespace std;

int main(){
    long long int A, B, K;
    cin>>A>>B;
    if((A+B)%2==0){
        K=(A+B)/2;
        cout<<K<<endl;
    }
    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: C

#include <bits/stdc++.h>

using namespace std;

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

    if ( A%2 == B%2 )
    {
        cout << (A+B)/2 << endl;
    }
    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>
using namespace std;
int main() {
	long long 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:14:11: error: expected ';' before '}' token
   14 |   return 0
      |           ^
      |           ;
   15 | }
      | ~
Language: C++

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


int main()
{
    int n,a,b,x,y;
    double k;


    cin>>a>>b;
    if(a!=b)
    {
        k=(a+b)*0.5;
        if(k==(int)k)
        {
            x=abs(a-k);
            y=abs(b-k);
            if(x==y)
            {
                cout<<fixed<<setprecision(0)<<k<<endl;
            }
            else {
                cout<<"IMPOSSIBLE"<<endl;
            }

        }
        else{
            cout<<"IMPOSSIBLE"<<endl;}
    }

    return 0;
}}

Compiler output:
a.cc:33:2: error: expected declaration before '}' token
   33 | }}
      |  ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   11 |     ans="IMPOSSIBLE";
      |         ^~~~~~~~~~~~
      |         |
      |         const char*
Language: C++

#include <iostream>

using namespace std;

#define RAJVI ios_base::sync_with_stdio(false);
#define DAIICT cin.tie(NULL);cout.tie(NULL);

{
    RAJVI
    DAIICT;
    
    int a=0,b=0,k=-1;
    cin>>a>>b;
    if((a+b)%2==0)
    {
     k=(a+b)/2;
     cout<<k;
        
    }
    else 
    {
        cout<<"IMPOSSIBLE";
        
    }
    
}

Compiler output:
a.cc:8:1: error: expected unqualified-id before '{' token
    8 | {
      | ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: expected ';' before '}' token
    9 |  cout << "IMPOSSIBLE"
      |                      ^
      |                      ;
   10 |   }
      |   ~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: expected '}' before 'else'
    9 |   else{
      |   ^~~~
a.cc:7:51: note: to match this '{'
    7 |   if((A%2 ==0 && B%2 ==0)||(A%2 == 1 && B%2 ==1)) {
      |                                                   ^
Language: C++

#include<bits/stdc++.h>
#define rep(i,a,b) for(int i=a;i<b;i++)
#define rrep(i,a,b) for(int i=a;i>=b;i--)
#define fore(i,a) for(auto &i:a)
#define all(x) (x).begin(),(x).end()
//#pragma GCC optimize ("-O3")
using namespace std;

int main() {
  
  int a,b,c,d,x;
  long long la.lb
  double da,db;
  string s,ss,sss;
  
  int ans = 0;
  string anss = "";
  
  cin >> la >> lb;
  
  int ab [] = {0 , 1 , 3 , 1 , 2 , 1 , 2 , 1 , 1 , 2 , 1 , 2 , 1};
  int result3 = std::max({a, b, c});
//--------------------------------------------------------------------------------

  if((la+lb)%2 == 0) cout << (la+lb)/2 << endl;
  else cout << "IMPOSSIBLE" << endl;

  //cout << a*a*3 << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:15: error: expected initializer before '.' token
   12 |   long long la.lb
      |               ^
a.cc:19:10: error: 'la' was not declared in this scope; did you mean 'a'?
   19 |   cin >> la >> lb;
      |          ^~
      |          a
a.cc:19:16: error: 'lb' was not declared in this scope; did you mean 'b'?
   19 |   cin >> la >> lb;
      |                ^~
      |                b
Language: Java

import java.util.Scanner;


public class Main {
    
    public static void main(String[] args) {
        
        Scanner  input = new Scanner(System.in);
        
        int A = input.nextInt();
        int B = input.nextInt();
        
        int count = 0; int i ;
        if(A>B){
        
            for ( i = 0; i >= 0; i++) {
                int x= Math.abs(A - i);
                int y = Math.abs(B - i);
                Math.abs(x);
                Math.abs(y);
                System.out.println(x+" "+y);
                if (x == y){
                count ++;
                break;
                }
            }
            if (count > 0 ){
            System.out.println(i); }
            else{
                System.out.println("IMPOSSIBLE");
            }
        }
            if (count > 0 ){
            System.out.println(i); }
            else{
                System.out.println("IMPOSSIBLE");
            }
        }
        
    }
}

Compiler output:
Main.java:41: error: class, interface, enum, or record expected
}
^
1 error
Language: C

#include<stdio.h>
 #include <math.h>
int main()
{
	int A,B,R;
	scanf("%d%d",&A,&B);
 
	if(abs(B-A)%2==0)
	{
		R =abs(B-A)/2;
		if (A<B){ 
            R=A+R;
            }
		else 
		{
		    R=B+R;
		}
		printf("%d", R);
	}
 
	else
	{
		printf("IMPOSSIBLE\n");
	}

Compiler output:
main.c: In function 'main':
main.c:8:12: error: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    8 |         if(abs(B-A)%2==0)
      |            ^~~
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:24:9: error: expected declaration or statement at end of input
   24 |         }
      |         ^
Language: C

#include<stdio.h>
 
int main()
{
	int A,B,R;
	scanf("%d %d",&A,&B);
 
	if(abs(B-A)%2==0)
	{
		R =abs(B-A)/2;
		if (A<B){ 
            R=A+R;
            }
		else 
		{
		    R=B+R;
		}
		printf("%d", R);
	}
 
	else
	{
		printf("IMPOSSIBLE\n");
	}

Compiler output:
main.c: In function 'main':
main.c:8:12: error: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    8 |         if(abs(B-A)%2==0)
      |            ^~~
main.c:2:1: note: include '<stdlib.h>' or provide a declaration of 'abs'
    1 | #include<stdio.h>
  +++ |+#include <stdlib.h>
    2 | 
main.c:24:9: error: expected declaration or statement at end of input
   24 |         }
      |         ^
Language: C

#include<stdio.h>
 
int main()
{
	int A,B,R;
	scanf("%d%d",&A,&B);
 
	if(abs(B-A)%2==0)
	{
		R =abs(B-A)/2;
		if (A<B){ 
            R=A+R;
            }
		else 
		{
		    R=B+R;
		}
		printf("%d", R);
	}
 
	else
	{
		printf("IMPOSSIBLE\n");
	}

Compiler output:
main.c: In function 'main':
main.c:8:12: error: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    8 |         if(abs(B-A)%2==0)
      |            ^~~
main.c:2:1: note: include '<stdlib.h>' or provide a declaration of 'abs'
    1 | #include<stdio.h>
  +++ |+#include <stdlib.h>
    2 | 
main.c:24:9: error: expected declaration or statement at end of input
   24 |         }
      |         ^
Language: C

#include<stdio.h>
 
int main()
{
	int A,B,R;
	scanf("%d%d",&A,&B);
 
	if(abs(B-A)%2==0)
	{
		R =abs(B-A)/2;
		if (A<B){ 
            R=A+R;
            }
		else 
		{
		    R=B+R;
		}
		printf("%d", res);
	}
 
	else
	{
		printf("IMPOSSIBLE\n")
	}

Compiler output:
main.c: In function 'main':
main.c:8:12: error: implicit declaration of function 'abs' [-Wimplicit-function-declaration]
    8 |         if(abs(B-A)%2==0)
      |            ^~~
main.c:2:1: note: include '<stdlib.h>' or provide a declaration of 'abs'
    1 | #include<stdio.h>
  +++ |+#include <stdlib.h>
    2 | 
main.c:18:30: error: 'res' undeclared (first use in this function)
   18 |                 printf("%d", res);
      |                              ^~~
main.c:18:30: note: each undeclared identifier is reported only once for each function it appears in
main.c:23:39: error: expected ';' before '}' token
   23 |                 printf("IMPOSSIBLE\n")
      |                                       ^
      |                                       ;
   24 |         }
      |         ~                              
main.c:24:9: error: expected declaration or statement at end of input
   24 |         }
      |         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
long long 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:11:11: error: expected '}' at end of input
   11 |  return 0;
      |           ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:10: error: expected primary-expression before '%' token
    7 |   if(a+b)%2!=0){
      |          ^
a.cc:12:4: error: expected '}' at end of input
   12 |   }
      |    ^
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(A%2=0 && B%2!=0 || A%2!=0 && B%2=0){
    cout << "IMPOSSIBLE" << endl;
  }
  
  else cout << (A+B)/2 << endl;
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:22: error: lvalue required as left operand of assignment
    8 |   if(A%2=0 && B%2!=0 || A%2!=0 && B%2=0){
      |          ~~~~~~~~~~~~^~~~~~~~~~~~~~~~
Language: C++

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

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

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

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:11: error: expected unqualified-id before ',' token
    5 |     int A,,B;
      |           ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main() {
  int a,b;
  for(int i=-100000000;i<100000000;i++) {
    if(abs(a-i)==abs(b-i) {
      cout<<i<<endl;
    }
       else{
         cout<<"IMPOSSIBLE"<<endl;
       }
       }
       return 0; 
       }

Compiler output:
a.cc: In function 'int main()':
a.cc:6:26: error: expected ')' before '{' token
    6 |     if(abs(a-i)==abs(b-i) {
      |       ~                  ^~
      |                          )
a.cc:12:8: error: expected primary-expression before '}' token
   12 |        }
      |        ^
Language: C

#include<stdio.h>
int main()
  { 
    int a,b,k,s;
    scanf("%d",&a);
    scanf("%d",&b);
    k=a+b;
    s=k/2;
    if(a<s&&s>b);
      printf("%d",s);
    else
      printf("impossible");
  return 0;
  }

Compiler output:
main.c: In function 'main':
main.c:11:5: error: 'else' without a previous 'if'
   11 |     else
      |     ^~~~
Language: C

#include<stdio.h>
int main()
  { 
    int a,b,k,s;
    scanf("%d",&a);
    scanf("%d",&b);
    k=a+b;
    s=k/2;
    if(a<s&&s>b);
      printf("%d",s);
    if-else(a>s&&s<b);
      printf("%d",s);
    else
      printf("impossible");
  return 0;
  }

Compiler output:
main.c: In function 'main':
main.c:11:7: error: expected '(' before '-' token
   11 |     if-else(a>s&&s<b);
      |       ^
      |       (
main.c:13:5: error: 'else' without a previous 'if'
   13 |     else
      |     ^~~~
Language: C

#include<stdio.h>
int main()
  { 
     int a,b,r,s;
     scanf("%d",&a);
     scanf("%d",&b);
     a-r=r-b;
     a-s=b-s; 
     printf("%d %d",r,s);
     return 0;
  }


Compiler output:
main.c: In function 'main':
main.c:7:9: error: lvalue required as left operand of assignment
    7 |      a-r=r-b;
      |         ^
main.c:8:9: error: lvalue required as left operand of assignment
    8 |      a-s=b-s;
      |         ^
Language: Java

import java.util.*;

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

Compiler output:
Main.java:9: error: illegal character: '\u3000'
              System.out.println((N + M)?/ 2);
                                        ^
1 error
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: expected '(' before '{' token
   10 |   else if {
      |           ^
      |           (
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: expected primary-expression before '<' token
   11 |     cout<<<"IMPOSSIBLE"<<endl;
      |           ^
a.cc:11:24: error: invalid operands of types 'const char [11]' and '<unresolved overloaded function type>' to binary 'operator<<'
   11 |     cout<<<"IMPOSSIBLE"<<endl;
      |            ~~~~~~~~~~~~^~~~~~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: expected primary-expression before '|' token
    7 |   if(|A-K|==|B-K|){
      |      ^
a.cc:7:12: error: expected primary-expression before '=' token
    7 |   if(|A-K|==|B-K|){
      |            ^
a.cc:7:13: error: expected primary-expression before '|' token
    7 |   if(|A-K|==|B-K|){
      |             ^
a.cc:7:18: error: expected primary-expression before ')' token
    7 |   if(|A-K|==|B-K|){
      |                  ^
a.cc:11:11: error: expected primary-expression before '<' token
   11 |     cout<<<"IMPOSSIBLE"<<endl;
      |           ^
a.cc:11:24: error: invalid operands of types 'const char [11]' and '<unresolved overloaded function type>' to binary 'operator<<'
   11 |     cout<<<"IMPOSSIBLE"<<endl;
      |            ~~~~~~~~~~~~^~~~~~
Language: C++

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

#include<stdio.h>

int main(void)
  {
  int A,B;
  scanf("%d %d",&A,&B);
  if(A % 2 = B % 2)printf("%d\n",B - A / 2);
  else printf("IMPOSSIBLE");
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: lvalue required as left operand of assignment
    7 |   if(A % 2 = B % 2)printf("%d\n",B - A / 2);
      |            ^
Language: C

#include<stdio.h>

int main(void)
  {
  int A,B;
  scanf("%d %d",&A,&B);
  if(A % 2 = B % 2)printf("%d",B - A / 2);
  else printf("IMPOSSIBLE");
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:12: error: lvalue required as left operand of assignment
    7 |   if(A % 2 = B % 2)printf("%d",B - A / 2);
      |            ^
Language: C++

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

int main(void){
  int a,b; cin>> a >> b;
  int c = abs(a-b);
  if(c % 2 == 1) cout <<"IMPOSSIBLE" << endl:
  else cout << min(a,b) + c /2 << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:45: error: expected ';' before ':' token
   10 |   if(c % 2 == 1) cout <<"IMPOSSIBLE" << endl:
      |                                             ^
      |                                             ;
Language: C++


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

int main()
{
	long double a,b;
	cin >> a >> b ;
	for (int i = 0; i <=max(a,b); i++)
	{
		if(abs(a - i) == abs(b - 1)){
			cout << i<< endl;
			retuen 0;
		}
		/* code */
	}
	

	cout << "IMPOSSIBLE"<< endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:25: error: 'retuen' was not declared in this scope
   13 |                         retuen 0;
      |                         ^~~~~~
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 c = Math.max(a-b,b-a);
        if(c%2==0){system.out.println(Math.max(a,b)-c/2);}
		else{System.out.println("IMPOSSIBLE");}
	}
}


Compiler output:
Main.java:8: error: package system does not exist
        if(c%2==0){system.out.println(Math.max(a,b)-c/2);}
                         ^
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:13:25: error: expected ';' before 'endl'
   13 |     cout << "IMPOSSIBLE" endl;
      |                         ^~~~~
      |                         ;
Language: Java

import java.util.Scanner;


public class ABC135_A {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		int A = input.nextInt();
		int B = input.nextInt();
		if ((A + B) % 2 ==0) {
			System.out.print((A+B)/2);
			
		}else {
			System.out.print("IMPOSSIBLE");
		}

	}

}

Compiler output:
Main.java:4: error: class ABC135_A is public, should be declared in a file named ABC135_A.java
public class ABC135_A {
       ^
1 error
Language: C++

#include <bits/stdc++.h/.
#define lli long long int
using namespace std;
int main(){
   ios_base::sync_with_stdio(false); 
    cin.tie(NULL);  
  cout.tie(0);
  lli a,b;
  cin>>a>>b;
  if((a+b)%2==0){
    cout<<(a+b)/2;
  }
  else{
    cout<<"IMPOSSIBLE";
  }
}

Compiler output:
a.cc:1:26: error: missing terminating > character
    1 | #include <bits/stdc++.h/.
      |                          ^
a.cc:1:10: fatal error: bits/stdc++.h/.: No such file or directory
    1 | #include <bits/stdc++.h/.
      |          ^
compilation terminated.
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
using ll = long long int;

int main() {
  ll a, b;
  cin >> a >> b;
  constexpr ll LAST = 1e9;
  
  ll sum = 0;
  for (ll i = 0; i < 1e9; i++) {
    if (abs(a-i) = abs(b-i)) {
      sum = i;
    }
  }
  cout << sum << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:12: error: lvalue required as left operand of assignment
   13 |     if (abs(a-i) = abs(b-i)) {
      |         ~~~^~~~~
Language: C++

#include <iostream>
#include <cmath>
using namespace std;
using ll = long long int;

int main() {
  ll a, b;
  cin >> a >> b;
  constexpr ll LAST = 1e9;
  
  ll sum = 0;
  for (ll i = 0; i < 1e9; i++) {
    if (abs(a-i) == abs(b-i)) {
      sum = i
    }
  }
  cout << sum << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:14: error: expected ';' before '}' token
   14 |       sum = i
      |              ^
      |              ;
   15 |     }
      |     ~