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

#include <bits/stdc++.h>
using namespace std;
int main(){
  char c [10][10];
  cout << c[0][0], c[1][1], c[2][2] << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:37: error: invalid operands of types 'char' and '<unresolved overloaded function type>' to binary 'operator<<'
    5 |   cout << c[0][0], c[1][1], c[2][2] << endl;
      |                             ~~~~~~~~^~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  char c [9];
  cout << c[1], c[5], c[9] << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:28: error: invalid operands of types 'char' and '<unresolved overloaded function type>' to binary 'operator<<'
    5 |   cout << c[1], c[5], c[9] << endl;
      |                       ~~~~~^~~~~~~
Language: C++

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

using ll = long long int;

const int MAX = (int)(1e5 + 5);
const ll INF = (ll)(1e10 + 5);

int main(void) {
  // Here your code !

  for (int i = 0; i < 9; ++i) {
    int c;
    scanf("%d", &c);

    if (i == 0) {
      printf("%d", c);
    }
    else if (i == 4) {
      printf("%d", d);
    }
    else if (i == 8) {
      printf("%d", d);
    }
  }

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:20: error: 'd' was not declared in this scope
   20 |       printf("%d", d);
      |                    ^
a.cc:23:20: error: 'd' was not declared in this scope
   23 |       printf("%d", d);
      |                    ^
Language: C++

#include <iostream>
#include <stirng>
#include <cmath>
#include <algorithm>
#include <map>
#include <set>
#include <vector>
using namespace std;
#define ll long long


int c[3][3];


int main(){

	for (int i = 0; i < 3; i++){
		for (int j = 0; j < 3; j++){
			cin >> c[i][j];
		}
	}

	cout << c[0][0] << c[1][1] << c[2][2] << endl;

	return 0;
}

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

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

int main(){
  string a,b,c;
  cin >> a >> b >> c;
  cout << "a[0]" << "b[1]" << "c[2]" << endl;
  return 0
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: expected ';' before '}' token
    8 |   return 0
      |           ^
      |           ;
    9 | }
      | ~
Language: C++

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

int main() {
  int c1,c2,c3;
  cin>>c1>>c2>>c3;
  cout<<c1[0]<<c2[1]<<c3[2]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: invalid types 'int[int]' for array subscript
    7 |   cout<<c1[0]<<c2[1]<<c3[2]<<endl;
      |           ^
a.cc:7:18: error: invalid types 'int[int]' for array subscript
    7 |   cout<<c1[0]<<c2[1]<<c3[2]<<endl;
      |                  ^
a.cc:7:25: error: invalid types 'int[int]' for array subscript
    7 |   cout<<c1[0]<<c2[1]<<c3[2]<<endl;
      |                         ^
Language: Java

import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
String C[][]=new String[3][3];
String result="";
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
c[i][j]=sc.next();
}
}
for(int k=0;k<3;k++){
result+=c[k][k];
}
System.out.println(result);
}
}


Compiler output:
Main.java:9: error: cannot find symbol
c[i][j]=sc.next();
^
  symbol:   variable c
  location: class Main
Main.java:13: error: cannot find symbol
result+=c[k][k];
        ^
  symbol:   variable c
  location: class Main
2 errors
Language: Java

import java.util.*;
public class Main{
public static void main(String args[]){
Scanner sc=new Scanner(System.in);
String C[][]=new char[3][3];
String result="";
for(int i=0;i<3;i++){
for(int j=0;j<3;j++){
c[i][j]=sc.next();
}
}
for(int k=0;k<3;k++){
result+=c[k][k];
}
System.out.println(result);
}
}

Compiler output:
Main.java:5: error: incompatible types: char[][] cannot be converted to String[][]
String C[][]=new char[3][3];
             ^
Main.java:9: error: cannot find symbol
c[i][j]=sc.next();
^
  symbol:   variable c
  location: class Main
Main.java:13: error: cannot find symbol
result+=c[k][k];
        ^
  symbol:   variable c
  location: class Main
3 errors
Language: C++

#include<iostream>
using namespace std;
int main(){
  vector<vector<char>> a(3,vector<char>(3));
  for(int i=0;i<3;i++){
    for(int j=0;j<3;j++){
      cin>>a.at(i).at(j);
    }
  }
  cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'vector' was not declared in this scope
    4 |   vector<vector<char>> a(3,vector<char>(3));
      |   ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:4:17: error: expected primary-expression before 'char'
    4 |   vector<vector<char>> a(3,vector<char>(3));
      |                 ^~~~
a.cc:7:12: error: 'a' was not declared in this scope
    7 |       cin>>a.at(i).at(j);
      |            ^
a.cc:10:9: error: 'a' was not declared in this scope
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |         ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  vector<vector<char>> a(3,vector<char>(3));
  for(int i=0;i<3;i++){
    for(int j=0;j<3;j++){
      cin>>a.at(i).at(j);
    }
  }
  cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'vector' was not declared in this scope
    4 |   vector<vector<char>> a(3,vector<char>(3));
      |   ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:4:17: error: expected primary-expression before 'char'
    4 |   vector<vector<char>> a(3,vector<char>(3));
      |                 ^~~~
a.cc:7:12: error: 'a' was not declared in this scope
    7 |       cin>>a.at(i).at(j);
      |            ^
a.cc:10:9: error: 'a' was not declared in this scope
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |         ^
a.cc:10:59: error: expected '}' at end of input
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                                           ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  char a[3][3];
  for(int i=0;i<3;i++){
    for(int j=0;j<3;j++){
      cin>>a.at(i).at(j);
    }
  }
  cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
    7 |       cin>>a.at(i).at(j);
      |              ^~
a.cc:10:11: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |           ^~
a.cc:10:26: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                          ^~
a.cc:10:41: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                         ^~
a.cc:10:59: error: expected '}' at end of input
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                                           ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
using namespace std;
int main(){
  char a[3][3];
  for(int i=0;i<3;i++;){
    for(int j=0;j<3;j++){
      cin>>a.at(i).at(j);
    }
  }
  cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:5:22: error: expected ')' before ';' token
    5 |   for(int i=0;i<3;i++;){
      |      ~               ^
      |                      )
a.cc:5:23: error: expected primary-expression before ')' token
    5 |   for(int i=0;i<3;i++;){
      |                       ^
a.cc:10:11: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |           ^~
a.cc:10:26: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                          ^~
a.cc:10:41: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                         ^~
a.cc:10:59: error: expected '}' at end of input
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                                           ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
using namepsace std;
int main(){
  char a[3][3];
  for(int i=0;i<3;i++;){
    for(int j=0;j<3;j++){
      cin>>a.at(i).at(j);
    }
  }
  cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namepsace'
    2 | using namepsace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:5:22: error: expected ')' before ';' token
    5 |   for(int i=0;i<3;i++;){
      |      ~               ^
      |                      )
a.cc:5:23: error: expected primary-expression before ')' token
    5 |   for(int i=0;i<3;i++;){
      |                       ^
a.cc:10:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |   ^~~~
      |   std::cout
In file included from a.cc:1:
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:10:11: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |           ^~
a.cc:10:26: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                          ^~
a.cc:10:41: error: request for member 'at' in 'a', which is of non-class type 'char [3][3]'
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                         ^~
a.cc:10:54: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                                      ^~~~
      |                                                      std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:10:59: error: expected '}' at end of input
   10 |   cout<<a.at(0).at(0)<<a.at(1).at(1)<<a.at(2).at(2)<<endl;
      |                                                           ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

,+[->,+]<<<<<<<<<<<<.>>>>>.>>>>>.

Compiler output:
a.cc:1:1: error: expected unqualified-id before ',' token
    1 | ,+[->,+]<<<<<<<<<<<<.>>>>>.>>>>>.
      | ^
a.cc:1:2: error: expected unqualified-id before '+' token
    1 | ,+[->,+]<<<<<<<<<<<<.>>>>>.>>>>>.
      |  ^
Language: C++

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <cstdlib>
#include <cmath>
#include <numeric>
#include <tuple>
#include <stack>

#define rep(i,n) for (int i = 0; i < (n); ++i)
#define all(x) x.begin(),x.end()
#define print(s) cout << s << endl
typedef long long ll;
using namespace std;

int ctoi(char c) {
	if (c >= '0' && c <= '9') {
		return c - '0';
	}
	return 0;
}

int main() {
	int s1,s2,s3; cin >> s1 >> s2 >> s3;
	cout << s1[0] << s2[1] << s3[2] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:19: error: invalid types 'int[int]' for array subscript
   26 |         cout << s1[0] << s2[1] << s3[2] << endl;
      |                   ^
a.cc:26:28: error: invalid types 'int[int]' for array subscript
   26 |         cout << s1[0] << s2[1] << s3[2] << endl;
      |                            ^
a.cc:26:37: error: invalid types 'int[int]' for array subscript
   26 |         cout << s1[0] << s2[1] << s3[2] << endl;
      |                                     ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s,t,u;
  cin>>s;
  cin>>t;
  cin>>u
  cout<<s.at(0)<<t.at(1)<<u.at(2);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: expected ';' before 'cout'
    7 |   cin>>u
      |         ^
      |         ;
    8 |   cout<<s.at(0)<<t.at(1)<<u.at(2);
      |   ~~~~
Language: C

#include<stdio.h>
int main(void){
  int i;
  char a[9];
  for(i=1;i<=3,i++){
    scanf("%c%c%c",&a[i],&a[i+1],&a[i+2]);
  }
  printf("%c%c%c",a[1],a[5],a[9]);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:19: error: expected ';' before ')' token
    5 |   for(i=1;i<=3,i++){
      |                   ^
      |                   ;
Language: C++

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

int main(){
  string S,T,U;
  cin >> S >> T >> U;
  cout << S.at(0) << T.at(1) << U.at(2) << endl;
}

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

#include<bits/stdc++.h>
using namespace std;
int main(){
 string c;
  cin>>c;
  cout<<"c.at(0)<<c.at(4)<<c.at(8)<<endl;"
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:43: error: expected ';' before '}' token
    6 |   cout<<"c.at(0)<<c.at(4)<<c.at(8)<<endl;"
      |                                           ^
      |                                           ;
    7 | }
      | ~
Language: C++

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

int main(void){
  string s1,s2,s3;
  cin>>s1>>s2>>s3;
  cou<<s1[0]<<s2[1]<<s1[2]<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'cou' was not declared in this scope; did you mean 'cos'?
    7 |   cou<<s1[0]<<s2[1]<<s1[2]<<endl;
      |   ^~~
      |   cos
Language: C++

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

int main(void){
  string s1,s2,s3;
  cin>>s1>>s2>>s3;
  cou<<s1[0]+s2[1]+s1[2]<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'cou' was not declared in this scope; did you mean 'cos'?
    7 |   cou<<s1[0]+s2[1]+s1[2]<<endl;
      |   ^~~
      |   cos
Language: C++

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

int main(void){
  string s1,s2,s3;
  cin>>s1>>s2>>s3;
  cou<<s1[0]<<s2[1]<<s1[2];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'cou' was not declared in this scope; did you mean 'cos'?
    7 |   cou<<s1[0]<<s2[1]<<s1[2];
      |   ^~~
      |   cos
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(Void){
  
  string p,q,r;
  cin >> p >> q >> r;
  
  cout << p[0] << q[1] << r[2] << endl;
  
  return 0;
}


Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main(Void){
      |     ^~~~
a.cc:4:10: error: 'Void' was not declared in this scope; did you mean 'void'?
    4 | int main(Void){
      |          ^~~~
      |          void
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{

        string ans = "";
        for(int i = 0 ; i < 3; i++){
                string a;
                cin >> a;
                ans += a[i];
        }

        cout << ans << endl;
        return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:14:18: error: expected '}' at end of input
   14 |         return 0;
      |                  ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  vector<int> a(3);
  for(int i=0;i<3;i++)cin>>a.at(i);
  cout<<a[0][0]<<a[1][1]<<a[2][2]<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:13: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
    6 |   cout<<a[0][0]<<a[1][1]<<a[2][2]<<endl;
      |             ^
a.cc:6:22: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
    6 |   cout<<a[0][0]<<a[1][1]<<a[2][2]<<endl;
      |                      ^
a.cc:6:31: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<int>, int>::value_type {aka int}[int]' for array subscript
    6 |   cout<<a[0][0]<<a[1][1]<<a[2][2]<<endl;
      |                               ^
Language: C++

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

int main(){
  vector<char>vec1(3);
  vector<char>vec2(3);
  vector<char>vec3(3);
  
  for(int i=0;i<3;i++){
    cin>>vec1[i];
  }
   for(int i=0;i<3;i++){
    cin>>vec2[i];
  }
   for(int i=0;i<3;i++){
    cin>>vec3[i];
  }
  
  cout<<vec1[1]<<vec2[2]<<vec3[3]<<endl;
}

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

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

int main() {
  string c1, c2, c3; cin >> c1 >> c2 >> c3;
  
  cout << c1[0] << c2[1] << c3[2] << endl;
}

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

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

int main() {
  strign C1, C2, C3;
  cin >> C1 >> C2 >> C3;
  cout << C1.at(0) << C2.at(1) << C3.at(2); 
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'strign' was not declared in this scope; did you mean 'strspn'?
    5 |   strign C1, C2, C3;
      |   ^~~~~~
      |   strspn
a.cc:6:10: error: 'C1' was not declared in this scope; did you mean 'y1'?
    6 |   cin >> C1 >> C2 >> C3;
      |          ^~
      |          y1
a.cc:6:16: error: 'C2' was not declared in this scope
    6 |   cin >> C1 >> C2 >> C3;
      |                ^~
a.cc:6:22: error: 'C3' was not declared in this scope
    6 |   cin >> C1 >> C2 >> C3;
      |                      ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  vecter<char> x(9);
for(int i=0;i<9;i++){cin>>x.at(i);}
  
  
  cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'vecter' was not declared in this scope
    5 |   vecter<char> x(9);
      |   ^~~~~~
a.cc:5:10: error: expected primary-expression before 'char'
    5 |   vecter<char> x(9);
      |          ^~~~
a.cc:6:27: error: 'x' was not declared in this scope
    6 | for(int i=0;i<9;i++){cin>>x.at(i);}
      |                           ^
a.cc:9:9: error: 'x' was not declared in this scope
    9 |   cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
      |         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  vecter<char> x(9);
for(int i=0;i<9;i++){cin>>x.at(i);}
  
  
  cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'vecter' was not declared in this scope
    5 |   vecter<char> x(9);
      |   ^~~~~~
a.cc:5:10: error: expected primary-expression before 'char'
    5 |   vecter<char> x(9);
      |          ^~~~
a.cc:6:27: error: 'x' was not declared in this scope
    6 | for(int i=0;i<9;i++){cin>>x.at(i);}
      |                           ^
a.cc:9:9: error: 'x' was not declared in this scope
    9 |   cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
      |         ^
a.cc: At global scope:
a.cc:11:1: error: expected declaration before '}' token
   11 | }
      | ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  vecter<char> x(9);
  for(int i=0;i<9;i++)cin>>x.at(i);
  
  
  cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'vecter' was not declared in this scope
    5 |   vecter<char> x(9);
      |   ^~~~~~
a.cc:5:10: error: expected primary-expression before 'char'
    5 |   vecter<char> x(9);
      |          ^~~~
a.cc:6:28: error: 'x' was not declared in this scope
    6 |   for(int i=0;i<9;i++)cin>>x.at(i);
      |                            ^
a.cc:9:9: error: 'x' was not declared in this scope
    9 |   cout<<x.at(0)<<x.at(4)<<x.at(8)<<endl;
      |         ^
a.cc: At global scope:
a.cc:11:1: error: expected declaration before '}' token
   11 | }
      | ^
Language: C

#include <stdio.h>
 
int main(void){
  int l1 = [3];
  int i;
  
  for (i = 0;i < 9;i += 3){
    scanf("%d", &l1[i]);
  }
  print("%d%d%d\n", l1[0], l1[1], l1[2]);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:12: error: expected expression before '[' token
    4 |   int l1 = [3];
      |            ^
main.c:8:20: error: subscripted value is neither array nor pointer nor vector
    8 |     scanf("%d", &l1[i]);
      |                    ^
main.c:10:3: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   10 |   print("%d%d%d\n", l1[0], l1[1], l1[2]);
      |   ^~~~~
      |   printf
main.c:10:23: error: subscripted value is neither array nor pointer nor vector
   10 |   print("%d%d%d\n", l1[0], l1[1], l1[2]);
      |                       ^
main.c:10:30: error: subscripted value is neither array nor pointer nor vector
   10 |   print("%d%d%d\n", l1[0], l1[1], l1[2]);
      |                              ^
main.c:10:37: error: subscripted value is neither array nor pointer nor vector
   10 |   print("%d%d%d\n", l1[0], l1[1], l1[2]);
      |                                     ^
Language: C++

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

int main() {
  int A, B, n;
  cin >> A >> B;
  n = 0
  for (int x = A; x <= B; x++) {
    int a, b, d, e;
    a = x / 10000;
    b = (x % 10000) / 1000;
    d = (x % 100) / 10;
    e = x % 10;
    if (a == e && b == d) {
      n++;
    }
  }
  cout << n << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: expected ';' before 'for'
    7 |   n = 0
      |        ^
      |        ;
    8 |   for (int x = A; x <= B; x++) {
      |   ~~~   
a.cc:8:19: error: 'x' was not declared in this scope
    8 |   for (int x = A; x <= B; x++) {
      |                   ^
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main(){
 vector<vector<char>> c(3,vector<char>(3));
  
  for(int i = 0; i < 3; i++){
    for(int j = 0; j < 3; j++{
      cin >> c[i][j];
    }
  }
  
  cout << c[0][0] << c[1][1] << c[2][2] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:30: error: expected ')' before '{' token
   10 |     for(int j = 0; j < 3; j++{
      |        ~                     ^
      |                              )
Language: C++

#include <iostream>

using namespace std;

int main(){
 vector<vector<char>> c(3,vector<char>(3));
  
  for(int i = 0; i < 3; i++){
    for(j = 0; j < 3; j++{
      cin >> c[i][j];
    }
  }
  
  cout << c[0][0] << c[1][1] << c[2][2] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'vector' was not declared in this scope
    6 |  vector<vector<char>> c(3,vector<char>(3));
      |  ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include <iostream>
  +++ |+#include <vector>
    2 | 
a.cc:6:16: error: expected primary-expression before 'char'
    6 |  vector<vector<char>> c(3,vector<char>(3));
      |                ^~~~
a.cc:9:9: error: 'j' was not declared in this scope
    9 |     for(j = 0; j < 3; j++{
      |         ^
a.cc:9:26: error: expected ')' before '{' token
    9 |     for(j = 0; j < 3; j++{
      |        ~                 ^
      |                          )
a.cc:10:14: error: 'c' was not declared in this scope
   10 |       cin >> c[i][j];
      |              ^
a.cc:14:11: error: 'c' was not declared in this scope
   14 |   cout << c[0][0] << c[1][1] << c[2][2] << endl;
      |           ^
Language: C++

#include <iostream>

using namespace std;

int main(){
 vector<vector<char>> c(3,vector<char>(3));
  
  rep(i,3){
    rep(j,3){
      cin >> c[i][j];
    }
  }
  
  cout << c[0][0] << c[1][1] << c[2][2] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:2: error: 'vector' was not declared in this scope
    6 |  vector<vector<char>> c(3,vector<char>(3));
      |  ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include <iostream>
  +++ |+#include <vector>
    2 | 
a.cc:6:16: error: expected primary-expression before 'char'
    6 |  vector<vector<char>> c(3,vector<char>(3));
      |                ^~~~
a.cc:8:7: error: 'i' was not declared in this scope
    8 |   rep(i,3){
      |       ^
a.cc:8:3: error: 'rep' was not declared in this scope
    8 |   rep(i,3){
      |   ^~~
a.cc:14:11: error: 'c' was not declared in this scope
   14 |   cout << c[0][0] << c[1][1] << c[2][2] << endl;
      |           ^
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <stack>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <math.h>
#include <stdio.h>
#include <ctype.h>
#include <ios> 
#include <iomanip>
using namespace std;

#define N_MAX   (100000)
#define LL_MAX_NUM (1LL<<60)
#define INF 1e7

typedef long long ll;
typedef long long int lli;

int main() {
	string c1 ,c2, c3;
	cin >> c1 >> c2 >> c3;
	cout << c1[0] << c2[1] << c[2] << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:35: error: 'c' was not declared in this scope; did you mean 'c3'?
   26 |         cout << c1[0] << c2[1] << c[2] << endl;
      |                                   ^
      |                                   c3
Language: C++

#include<iostream>

using namespace std;

int main(void){
  char a[4],b[4],c[4];
  
  cin>>a>>b>>c;
  cout<<a[0],b[1],c[2]<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:23: error: invalid operands of types 'char' and '<unresolved overloaded function type>' to binary 'operator<<'
    9 |   cout<<a[0],b[1],c[2]<<endl;
      |                   ~~~~^~~~~~
Language: C++

#include<iostream>

using namespace std;

int main(void){
  char a[4],b[4],c[4];
  
  cin>>a>>b>>c;
  cout<<a[0] ¥bb[1] ¥bc[2]<<endl;
  return 0;
}

Compiler output:
a.cc:9:14: error: extended character ¥ is not valid in an identifier
    9 |   cout<<a[0] ¥bb[1] ¥bc[2]<<endl;
      |              ^
a.cc:9:21: error: extended character ¥ is not valid in an identifier
    9 |   cout<<a[0] ¥bb[1] ¥bc[2]<<endl;
      |                     ^
a.cc: In function 'int main()':
a.cc:9:13: error: expected ';' before '\U000000a5bb'
    9 |   cout<<a[0] ¥bb[1] ¥bc[2]<<endl;
      |             ^~~~
      |             ;
Language: C++

#include<iostream>

using namespace std;

int main(void){
  char a[4],b[4],c[4];
  
  cin>>a>>b>>c;
  cout<<a[0]b[1]c[2]<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: expected ';' before 'b'
    9 |   cout<<a[0]b[1]c[2]<<endl;
      |             ^
      |             ;
Language: C++

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

int main(){
  vector<char> s(9);
  for(int i=0;i<9;i++){  
    cin >> s(i);
  }
  
  cout << s(0)<<s(4)<<s(8) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: no match for call to '(std::vector<char>) (int&)'
    7 |     cin >> s(i);
      |            ~^~~
a.cc:10:12: error: no match for call to '(std::vector<char>) (int)'
   10 |   cout << s(0)<<s(4)<<s(8) << endl;
      |           ~^~~
a.cc:10:18: error: no match for call to '(std::vector<char>) (int)'
   10 |   cout << s(0)<<s(4)<<s(8) << endl;
      |                 ~^~~
a.cc:10:24: error: no match for call to '(std::vector<char>) (int)'
   10 |   cout << s(0)<<s(4)<<s(8) << endl;
      |                       ~^~~
Language: C++

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

int main() {
  char a,b,c,d,e,f,g,h,i;
  vector<vector<char>> p(3, vector<char(3));
  for (int  k = 0; k < 3; k++) for ( int l = 0; l < 3; l++) cin >> p.at(k).at(l);
  
  cout << p.at(0).at(0) << p.at(1).at(1) << p.at(2).at(2);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:42: error: type/value mismatch at argument 1 in template parameter list for 'template<class _Tp, class _Alloc> class std::vector'
    6 |   vector<vector<char>> p(3, vector<char(3));
      |                                          ^
a.cc:6:42: note:   expected a type, got ''\003''
a.cc:6:42: error: template argument 2 is invalid
Language: C++

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

int main(){
  int a,b;
  cin>>a>>b;
  int i=0;
  for(a;a<b;a++){
    if (a/10000==a%10)&&(a/1000==a/10%10)
      i++;
  }
  cout<<i<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: expected identifier before '(' token
    9 |     if (a/10000==a%10)&&(a/1000==a/10%10)
      |                         ^
Language: C++

#include <string>
#include <bits/stdc++.h>
#include <stdio.h>
#include<math.h>
#include <ctype.h>
#include <algorithm> // sort
#include <map> // pair
using namespace std;
 
int main() {
  vector<char> vec(9);
  for(int i=0;i<9;i++){
    cin >> a.at(i);
  }
  cout << vec.at(0) << vec.at(4) << vec.at(8) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:12: error: 'a' was not declared in this scope
   13 |     cin >> a.at(i);
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
    string A,B,C; cin >> A >> B >> C;
    cout << A.at(0) + B.at(1) << C,at(2) << endl;
    return 0;
}   

Compiler output:
a.cc: In function 'int main()':
a.cc:5:36: error: 'at' was not declared in this scope
    5 |     cout << A.at(0) + B.at(1) << C,at(2) << endl;
      |                                    ^~
Language: C++

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

int main(void){
    char c[3][3];;
    for(int i=0;i<3;i++){
        for(int j=0;j<3;j++){
            cin>>c[i][j];
        }
    }
    cout<<c[0][0]<<c[1][1]<<c[2][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

    #include<stdio.h>
    #include<string.h>
    int main(void){
    int A,B,C,D,E,N,M,x,y,i,j,cou=0,cou2,v[1000000],w[1000000],min_i,en=0;
        char S[100],W[100],s[10],X,Y;
       for(i=0;i<3;i++){
            scanf("%s",&S[i]);
    }
    printf("%c%c%c",S[0][0],S[1][1],S[2][2]);
    return 0;
    }

Compiler output:
main.c: In function 'main':
main.c:9:25: error: subscripted value is neither array nor pointer nor vector
    9 |     printf("%c%c%c",S[0][0],S[1][1],S[2][2]);
      |                         ^
main.c:9:33: error: subscripted value is neither array nor pointer nor vector
    9 |     printf("%c%c%c",S[0][0],S[1][1],S[2][2]);
      |                                 ^
main.c:9:41: error: subscripted value is neither array nor pointer nor vector
    9 |     printf("%c%c%c",S[0][0],S[1][1],S[2][2]);
      |                                         ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
//#define int long long
#define rep(i, n) for(int i = 0; i < (n); ++i)
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define ALL(v) (v).begin(), (v).end()
#define ios() ios::sync_with_stdio(0); cin.tie(0); cout.tie(0)
using ll = long long;
using ull = unsigned long long;
using vi = vector<int>;
using vvi = vector<vi>;
using pii = pair<int,int>;
constexpr ll MOD = 10e9+7;
constexpr ll INF = 1LL << 60;
constexpr int Inf = 1e9;
inline int in() {int x; cin >> x; return x;}
template <typename T> inline void out(const T& x) {cout << x << endl;}
template <class T> inline bool chmin(T &a, T b){if (a > b){a = b;return 1;}return 0;}
template <class T> inline bool chmax(T &a, T b){if (a < b){a = b;return 1;}return 0;}
//UP = 0;RIGHT = 1; DOWN = 2; LEFT =3;
const int dx[] = {0, 1, 0, -1, 1, -1, 1, -1}, dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
int gcd(int a, int b)
{
  if (a < b)
    gcd(b, a);
  int r;
  while ((r = a % b))
  {
    a = b;
    b = r;
  }
  return b;
}
void eratos(bool * isPrime,int max){
  fill(isPrime,isPrime + max,true);
  isPrime[0] = false; 
  isPrime[1] = false; 
  for(int i=2; i<=max/i; ++i) 
      if(isPrime[i]) 
          for(int j=2; j<=max/i; ++j) 
              isPrime[i*j] = false;    
}
//

signed main()
{
  ios();
  char A[3][3];
  rep(i,3)rep(j,3)cin >> A[i][j];
  rep(i,3)cout << A[i][i];
  cout << endl;


Compiler output:
a.cc: In function 'int main()':
a.cc:51:16: error: expected '}' at end of input
   51 |   cout << endl;
      |                ^
a.cc:46:1: note: to match this '{'
   46 | {
      | ^
Language: C++

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

int main (){
  string s1,s2,s3 ;
  cin >> s1 >> s2 >> s3 ;
  cout << s1[0] << s2[1] << s[2] << endl ;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:29: error: 's' was not declared in this scope; did you mean 's3'?
    7 |   cout << s1[0] << s2[1] << s[2] << endl ;
      |                             ^
      |                             s3
Language: C++

#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#define For(i, n) for(int i = 0; i < (n); i ++)
#define Range(container) container.begin(), container.end()
#define Cin(T, x) T x; cin >> x;
#define Cins(T, n, xs) vector<T> xs(n); For(i, n) cin >> xs[i];
#define Cout(val) cout << (val) << "\n";
using namespace std;
using ll = long long;

int main(void){
    Cins(string, s);
    Cout(s[0][0] + s[1][1] + s[2][2]);
}

Compiler output:
a.cc:14:19: error: macro "Cins" requires 3 arguments, but only 2 given
   14 |     Cins(string, s);
      |                   ^
a.cc:8:9: note: macro "Cins" defined here
    8 | #define Cins(T, n, xs) vector<T> xs(n); For(i, n) cin >> xs[i];
      |         ^~~~
a.cc: In function 'int main()':
a.cc:14:5: error: 'Cins' was not declared in this scope
   14 |     Cins(string, s);
      |     ^~~~
a.cc:15:10: error: 's' was not declared in this scope
   15 |     Cout(s[0][0] + s[1][1] + s[2][2]);
      |          ^
a.cc:9:28: note: in definition of macro 'Cout'
    9 | #define Cout(val) cout << (val) << "\n";
      |                            ^~~
Language: C++

#include <iostream>
using namespace std;

void main() {
    for (int i = 0; i < 3; i++) {
        string s;
        cin >> s;
        cout << s[i];
    }
}

Compiler output:
a.cc:4:1: error: '::main' must return 'int'
    4 | void main() {
      | ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c;
  cin>>a>>b>>c;
  
  cout<<a[0]<<b[1]<<c[2]<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:10: error: invalid types 'int[int]' for array subscript
    7 |   cout<<a[0]<<b[1]<<c[2]<<endl;
      |          ^
a.cc:7:16: error: invalid types 'int[int]' for array subscript
    7 |   cout<<a[0]<<b[1]<<c[2]<<endl;
      |                ^
a.cc:7:22: error: invalid types 'int[int]' for array subscript
    7 |   cout<<a[0]<<b[1]<<c[2]<<endl;
      |                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c,d,e,f,g,h,i;
  cin>>a>>b>>c>>d>>e>>f>>g>>h>>i;
  cout<<a<<e<<i<<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:18: error: expected primary-expression before '<' token
    6 |   cout<<a<<e<<i<<<endl;
      |                  ^
Language: C++

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

int main(void){
  string x,y,z
  cin >> x >> y >> z;
  cout << x[0] << y[1] << z[2] << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected initializer before 'cin'
    7 |   cin >> x >> y >> z;
      |   ^~~
a.cc:8:27: error: 'z' was not declared in this scope
    8 |   cout << x[0] << y[1] << z[2] << endl;
      |                           ^
Language: Java

import java.util.*;

public class Main {
    public static void main(String[] args) throws Exception {
        Scanner scan = new Scanner(System.in);
        String[] c;
        c = new String[3];
        for(int i=0;i<c.length;i++)
        {
            c[3]=scan.next();
            System.out.print(c.charAt(i)); 
        }
        System.out.println("");
    }
}

Compiler output:
Main.java:11: error: cannot find symbol
            System.out.print(c.charAt(i)); 
                              ^
  symbol:   method charAt(int)
  location: variable c of type String[]
1 error
Language: C++

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

int main() {
  vector<string> c(9);
  cin >>c.at(0)>>c.at(1)>>c.at(2)c.at(3)>>c.at(4)>>c.at(5)>>c.at(6)>>c.at(7)>>c.at(8);
    
  cout << c.at(0) + c.at(4) + c.at(8);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:34: error: expected ';' before 'c'
    6 |   cin >>c.at(0)>>c.at(1)>>c.at(2)c.at(3)>>c.at(4)>>c.at(5)>>c.at(6)>>c.at(7)>>c.at(8);
      |                                  ^
      |                                  ;
Language: C++

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

int main() {
  vector<string> c(9);
  cin >>c.at(0)>>c.at(1)>>c.at(2)c.at(3)>>c.at(4)>>c.at(5)>>c.at(6)>>c.at(7)>>c.at(8)>>;
    
  cout << c.at(0) + c.at(4) + c.at(8);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:34: error: expected ';' before 'c'
    6 |   cin >>c.at(0)>>c.at(1)>>c.at(2)c.at(3)>>c.at(4)>>c.at(5)>>c.at(6)>>c.at(7)>>c.at(8)>>;
      |                                  ^
      |                                  ;
Language: C++

#include <iostream>

int main() {
 int c[5][5];
 
 for(int i=0; i<3; ++i) {
  for(int j=0; j<3; ++j) {
	cin >> c[i][j];
  }
 }

 cout << c[0][0] << c[1][1] << c[2][2] << "\n";
 
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |         cin >> c[i][j];
      |         ^~~
      |         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:12:2: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   12 |  cout << c[0][0] << c[1][1] << c[2][2] << "\n";
      |  ^~~~
      |  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<stdio.h.

int main(){
  char s1[4], s2[4], s3[4], s4[4];
  
  scanf("%s %s %s", s1, s2, s3);
  
  s4[0] = s1[0];
  s4[1] = s2[1];
  s4[2] = s3[2];
  s4[3] = '\0';
  
  printf("%s", s4);
  
  return 0;
}

Compiler output:
main.c:1:18: error: missing terminating > character
    1 | #include<stdio.h.
      |                  ^
main.c:1:9: fatal error: stdio.h.: No such file or directory
    1 | #include<stdio.h.
      |         ^
compilation terminated.
Language: C

#include<stdio.h.

int main(){
  char s1[4], s2[4], s3[4], s4[4];
  
  scanf("%d %d %d", s1, s2, s3);
  
  s4[0] = s1[0];
  s4[1] = s2[1];
  s4[2] = s3[2];
  s4[3] = '\0';
  
  printf("%s", s4);
  
  return 0;
}

Compiler output:
main.c:1:18: error: missing terminating > character
    1 | #include<stdio.h.
      |                  ^
main.c:1:9: fatal error: stdio.h.: No such file or directory
    1 | #include<stdio.h.
      |         ^
compilation terminated.
Language: C

#include <stdio.h>

int main(void)
{
	int x,y,z,a,b,d;
	char c[3][3]
	for(x=0;x<3;x++) scanf("%s",c[x]);
	for(x=0;x<3;x++) printf("%c",c[x][x]);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:9: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'for'
    7 |         for(x=0;x<3;x++) scanf("%s",c[x]);
      |         ^~~
main.c:7:37: error: 'c' undeclared (first use in this function)
    7 |         for(x=0;x<3;x++) scanf("%s",c[x]);
      |                                     ^
main.c:7:37: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include <stdio.h>
int (){
char a[3],b[3],c[3];
 for (int d=0;d<3;d++){
 scanf ("%s",a[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",b[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",c[d]);
 }
  printf ("%s%s%s",a[1],b[2],c[3]);
  return 0;
}

Compiler output:
main.c:2:6: error: expected identifier or '(' before ')' token
    2 | int (){
      |      ^
Language: C

#include <stdio.h>
int (){
char a[3],b[3],c[3];
 for (int d=0;d<3;d++){
 scanf ("%s",&a[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",&b[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",&c[d]);
 }
  printf ("%s%s%s",a[1],b[2],c[3]);
  return 0;
}

Compiler output:
main.c:2:6: error: expected identifier or '(' before ')' token
    2 | int (){
      |      ^
Language: C

#include <stdio.h>
int (){
char a[3]b[3],c[3];
 for (int d=0;d<3;d++){
 scanf ("%s",&a[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",&b[d]);
 }
   for (int d=0;d<3;d++){
 scanf ("%s",&c[d]);
 }
  printf ("%s%s%s",a[1],b[2],c[3]);
  return 0;
}

Compiler output:
main.c:2:6: error: expected identifier or '(' before ')' token
    2 | int (){
      |      ^
Language: C++

#include "bits/stdc++.h"
using namespace std;
int main(){
  string a,b,c;
  cin>>a>>b>>c;
  string ans=a[0]+b[1]+c[2];
  cout<<ans<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:23: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    6 |   string ans=a[0]+b[1]+c[2];
Language: C++

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

int main(){
  char a[3][3]
  cin >> a[0] >> a[1] >> a[2];
  cout << a[0][0] + a[1][1] + a[2][2] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: expected initializer before 'cin'
    7 |   cin >> a[0] >> a[1] >> a[2];
      |   ^~~
a.cc:8:11: error: 'a' was not declared in this scope
    8 |   cout << a[0][0] + a[1][1] + a[2][2] << endl;
      |           ^
Language: C++

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

int main(){
  string c;
  for(int i = 0 ; i<= 2; i++){
    for(int j = 0; j <= 2; j++){
      cin >> c[i][j];
      cout << c[1][1] + c[2][2] + c[3][3] << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:18: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    9 |       cin >> c[i][j];
      |                  ^
a.cc:10:19: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   10 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                   ^
a.cc:10:29: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   10 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                             ^
a.cc:10:39: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   10 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                                       ^
Language: C++

#include<bits/stdc++.h>
#include<string>
using namespace std;
string c;
int main(){
  for(int i = 0 ; i<= 2; i++){
    for(int j = 0; j <= 2; j++){
      cin >> c[i][j];
      cout << c[1][1] + c[2][2] + c[3][3] << endl;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |       cin >> c[i][j];
      |                  ^
a.cc:9:19: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    9 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                   ^
a.cc:9:29: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    9 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                             ^
a.cc:9:39: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    9 |       cout << c[1][1] + c[2][2] + c[3][3] << endl;
      |                                       ^
Language: C++

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

int main(){
  vector<int> N;
  for(int i=0; i<9; i++) cin>>N[i];
  cout<<N[0]<<N[4]<<[8];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: expected identifier before numeric constant
    7 |   cout<<N[0]<<N[4]<<[8];
      |                      ^
a.cc: In lambda function:
a.cc:7:24: error: expected '{' before ';' token
    7 |   cout<<N[0]<<N[4]<<[8];
      |                        ^
Language: C++

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

int main(){
  vector<int> N;
  for(int i=0; i<9; i++) cin>>N[i]
  cout<<N[0]<<N[4]<<[8];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:35: error: expected ';' before 'cout'
    6 |   for(int i=0; i<9; i++) cin>>N[i]
      |                                   ^
      |                                   ;
    7 |   cout<<N[0]<<N[4]<<[8];
      |   ~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){

  for(int i=0,string s;cin>>s;i++) cout<<s[i];
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:21: error: expected ';' before 's'
    5 |   for(int i=0,string s;cin>>s;i++) cout<<s[i];
      |                     ^~
      |                     ;
a.cc:5:22: error: 's' was not declared in this scope
    5 |   for(int i=0,string s;cin>>s;i++) cout<<s[i];
      |                      ^
a.cc:5:30: error: expected ')' before ';' token
    5 |   for(int i=0,string s;cin>>s;i++) cout<<s[i];
      |      ~                       ^
      |                              )
a.cc:5:31: error: 'i' was not declared in this scope
    5 |   for(int i=0,string s;cin>>s;i++) cout<<s[i];
      |                               ^
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Manin {

	public static void main(String[] args) throws NumberFormatException, IOException {
		// TODO 自動生成されたメソッド・スタブ
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String a = (br.readLine());
		String b = (br.readLine());
		String c = (br.readLine());

		System.out.println(a.charAt(0) + b.charAt(1) + c.charAt(2));

	}

}


Compiler output:
Main.java:5: error: class Manin is public, should be declared in a file named Manin.java
public class Manin {
       ^
1 error