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

#include<iostream>
using namespace std;
int main(){
  int N;
  cin>>N;
  int a[N],b[N],c[N];
  for(int i=0;i<N;i++)cin>>a[i];
  for(int i=0;i<N;i++)cin>>b[i];
  for(int i=0;i<N;i++)cin>>c[i];
  int cgb[N];
  for(int j=0;j<N;j++){
    cgb[j]=0;
      for(int r=0;r<N;r++){
        if(b[j]<c[r])cgb[j]+=1;
    }
  }
  int ans;
  for(int i=0;i<N;i++){
    for(int j=0;j<N;j++){
      if(a[i]<b[j])ans+=cgb[j];
    }
  }
  cout<<ans;
  return 0;
}
#include<iostream>
using namespace std;
int main(){
  int N;
  cin>>N;
  int a[N],b[N],c[N];
  for(int i=0;i<N;i++)cin>>a[i];
  for(int i=0;i<N;i++)cin>>b[i];
  for(int i=0;i<N;i++)cin>>c[i];
  a.sort();
  b.sort();
  c.sort();
  int cgb[N];
  for(int j=0;j<N;j++){
    cgb[j]=0;
      for(int r=0;r<N;r++){
        if(b[j]<c[r])cgb[j]+=1;
    }
  }
  int ans;
  for(int i=0;i<N;i++){
    for(int j=0;j<N;j++){
      if(a[i]<b[j])ans+=cgb[j];
    }
  }
  cout<<ans;
  return 0;
}


Compiler output:
a.cc:28:5: error: redefinition of 'int main()'
   28 | int main(){
      |     ^~~~
a.cc:3:5: note: 'int main()' previously defined here
    3 | int main(){
      |     ^~~~
a.cc: In function 'int main()':
a.cc:35:5: error: request for member 'sort' in 'a', which is of non-class type 'int [N]'
   35 |   a.sort();
      |     ^~~~
a.cc:36:5: error: request for member 'sort' in 'b', which is of non-class type 'int [N]'
   36 |   b.sort();
      |     ^~~~
a.cc:37:5: error: request for member 'sort' in 'c', which is of non-class type 'int [N]'
   37 |   c.sort();
      |     ^~~~
Language: C++

#include<iostream>
using namespace std;


int main(){
  string str1,str2;
  int bool a=true;
  for(int i=0;i<3;i++){
    if(str1[i]=str2[2-i]{
      a=false;
      break;
    }
  }
  string ans="NO";
       if(a)ans="YES";
  cout<<ans<<endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: two or more data types in declaration of 'a'
    7 |   int bool a=true;
      |   ^~~
a.cc:9:25: error: expected ')' before '{' token
    9 |     if(str1[i]=str2[2-i]{
      |       ~                 ^
      |                         )
a.cc:13:3: error: expected primary-expression before '}' token
   13 |   }
      |   ^
a.cc:15:11: error: 'a' was not declared in this scope
   15 |        if(a)ans="YES";
      |           ^
Language: C++

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<cmath>
char a[10][10];
int main()
{
	int i,j,n;
    for(i = 0;i <= 2;i++)
    {
    		for(j = 0;j <= 3;j++)
    	{	scanf(" %c",&a[i][j]);
		           }

	   }
	   printf("\n");

	   for(i = 1;i <= 2;i++){

	   	   for(j = 1; i<=3;j++){
           printf("%c ",a[i][j]);}

    if(a[2][3]==[2][1] && a[1][2]==a[2][1] && a[1][1]==a[1][3])
    	{
    		printf("YES");
    		}
    else
    	printf("NO");

}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:24:18: error: expected identifier before numeric constant
   24 |     if(a[2][3]==[2][1] && a[1][2]==a[2][1] && a[1][1]==a[1][3])
      |                  ^
a.cc: In lambda function:
a.cc:24:20: error: expected '{' before '[' token
   24 |     if(a[2][3]==[2][1] && a[1][2]==a[2][1] && a[1][1]==a[1][3])
      |                    ^
a.cc: In function 'int main()':
a.cc:24:20: error: no match for 'operator[]' (operand types are 'main()::<lambda()>' and 'int')
Language: C++

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

char a[6][6];
int main{
	cin >> a[1][1] >> a[1][2] >> a[1][3] >> a[2][1] >> a[2][2] >> a[2][ 3 ] ;
	if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] == a[2][1]){
		cout<<"YES"<<endl;
	}
	else{
		cout<<"NO"<<endl;
	}
}

Compiler output:
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:81: error: expected '}' before ';' token
    6 |         cin >> a[1][1] >> a[1][2] >> a[1][3] >> a[2][1] >> a[2][2] >> a[2][ 3 ] ;
      |                                                                                 ^
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:6:68: error: invalid user-defined conversion from 'std::basic_istream<char>' to 'int' [-fpermissive]
    6 |         cin >> a[1][1] >> a[1][2] >> a[1][3] >> a[2][1] >> a[2][2] >> a[2][ 3 ] ;
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~
In file included from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/istream:40,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_ios.h:121:16: note: candidate is: 'std::basic_ios<_CharT, _Traits>::operator bool() const [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  121 |       explicit operator bool() const
      |                ^~~~~~~~
/usr/include/c++/14/bits/basic_ios.h:121:16: note:   return type 'bool' of explicit conversion function cannot be converted to 'int' with a qualification conversion
a.cc:7:9: error: expected unqualified-id before 'if'
    7 |         if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] == a[2][1]){
      |         ^~
a.cc:10:9: error: expected unqualified-id before 'else'
   10 |         else{
      |         ^~~~
a.cc:13:1: error: expected declaration before '}' token
   13 | }
      | ^
Language: C

#include <cstdio>
#include <cmath>
#include <cstring>
#include <algorithm>
int main(){
  	  char a[5];
      scanf("%c%c%c\n",&a[0],&a[1],&a[2]);
      scanf("%c%c%c",&a[3],&a[4],&a[5]);
  	  if (a[0]==a[5]&&a[1]==a[4]&&a[2]==a[3])
  	  	  printf("YES\n");
  	  	  else
  	  	  	  printf("No\n");


  	  	  	  return 0;

              }


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

#include<stdio.h>
#include<string.h>
int main()
{
	char a[100], b[100] = { 0 }, c[100] = { 0 };
	scanf("%s", a);
	getchar();
	int len = strlen(a);
	for (int i = 0; i <len; i++)
	{
		c[i] = a[len-i-1];
	}
	gets(b);
    if (strcmp(c, b)==0)printf("YES\n");
	else printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   13 |         gets(b);
      |         ^~~~
      |         getw
Language: C++

#include<algorithm>
#include<cmath>
using namespace std;

int main()
{
	int i,j;
	char a[2][3];
	for( i=1;i<=2;i++)
	{
		printf("please input string:");
		for( j=1;j<=3;j++)
		{
 	     scanf("%s",&a[i][j]);
 	    }
 	    continue;
	}
	if(a[1][1]==a[2][3])
		printf("YES");
    	 else
 	  printf("NO\n");
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: 'printf' was not declared in this scope
   11 |                 printf("please input string:");
      |                 ^~~~~~
a.cc:3:1: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
    2 | #include<cmath>
  +++ |+#include <cstdio>
    3 | using namespace std;
a.cc:14:14: error: 'scanf' was not declared in this scope
   14 |              scanf("%s",&a[i][j]);
      |              ^~~~~
a.cc:19:17: error: 'printf' was not declared in this scope
   19 |                 printf("YES");
      |                 ^~~~~~
a.cc:19:17: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
a.cc:21:11: error: 'printf' was not declared in this scope
   21 |           printf("NO\n");
      |           ^~~~~~
a.cc:21:11: note: 'printf' is defined in header '<cstdio>'; this is probably fixable by adding '#include <cstdio>'
Language: C++

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

char a[6][6];
int main{
	cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
	if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
		cout<<"YES"<<endl;
	}
	else{
		cout<<"NO"<<endl;
	}
}

Compiler output:
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:66: error: expected '}' before ';' token
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                                                  ^
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:6:57: error: invalid user-defined conversion from 'std::basic_istream<char>' to 'int' [-fpermissive]
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/istream:40,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_ios.h:121:16: note: candidate is: 'std::basic_ios<_CharT, _Traits>::operator bool() const [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  121 |       explicit operator bool() const
      |                ^~~~~~~~
/usr/include/c++/14/bits/basic_ios.h:121:16: note:   return type 'bool' of explicit conversion function cannot be converted to 'int' with a qualification conversion
a.cc:7:9: error: expected unqualified-id before 'if'
    7 |         if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
      |         ^~
a.cc:10:9: error: expected unqualified-id before 'else'
   10 |         else{
      |         ^~~~
a.cc:13:1: error: expected declaration before '}' token
   13 | }
      | ^
Language: C++

#include<stdio.h>
#pragma warning (disable:4996)
#include<string.h>
int main()
{
	char a[100], b[100] = { 0 }, c[100] = { 0 };
	
	scanf("%s", a);
	getchar();
	int len = strlen(a);
	for (int i = 0; i <len; i++)
	{
		c[i] = a[len-i-1];
	}
	gets(b);
    if (strcmp(c, b)==0)printf("YES\n");
	else printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   15 |         gets(b);
      |         ^~~~
      |         getw
Language: C++

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

char a[3][4];
int main{
	cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
	if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
		cout<<"YES"<<endl;
	}
	else{
		cout<<"NO"<<endl;
	}


Compiler output:
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:66: error: expected '}' before ';' token
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                                                  ^
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:6:57: error: invalid user-defined conversion from 'std::basic_istream<char>' to 'int' [-fpermissive]
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/ios:46,
                 from /usr/include/c++/14/istream:40,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_ios.h:121:16: note: candidate is: 'std::basic_ios<_CharT, _Traits>::operator bool() const [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  121 |       explicit operator bool() const
      |                ^~~~~~~~
/usr/include/c++/14/bits/basic_ios.h:121:16: note:   return type 'bool' of explicit conversion function cannot be converted to 'int' with a qualification conversion
a.cc:7:9: error: expected unqualified-id before 'if'
    7 |         if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
      |         ^~
a.cc:10:9: error: expected unqualified-id before 'else'
   10 |         else{
      |         ^~~~
Language: C++

    #include<stdio.h>
    main()
    {
    char  a,b,c,d,e,f;
    printf("input c11,c12,c13,c21,c22,c23\n");
    scanf("%c,%c,%c,%c,%c,%c"&a,&b,&c,&d,&e,&f);
    if ((a = f)&&(b =e)&&(c = d))
    printf("yes\n");
    else
    printf("no\n");
    return 0;
    }

Compiler output:
a.cc:2:5: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    2 |     main()
      |     ^~~~
a.cc: In function 'int main()':
a.cc:6:30: error: invalid operands of types 'const char [18]' and 'char' to binary 'operator&'
    6 |     scanf("%c,%c,%c,%c,%c,%c"&a,&b,&c,&d,&e,&f);
      |           ~~~~~~~~~~~~~~~~~~~^~
      |           |                   |
      |           const char [18]     char
Language: C++

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

char a[3][4];
int main{
	cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
	if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
		cout<<"YES"<<endl;
	}
	else{
		cout<<"NO"<<endl;
	}
}

Compiler output:
a.cc:2:20: error: expected ';' before '?' token
    2 | using namespace std?
      |                    ^
      |                    ;
a.cc:2:20: error: expected unqualified-id before '?' token
a.cc:5:5: error: cannot declare '::main' to be a global variable
    5 | int main{
      |     ^~~~
a.cc:6:14: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |              ^
a.cc:6:23: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                       ^
a.cc:6:32: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                ^
a.cc:6:41: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                         ^
a.cc:6:50: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                                  ^
a.cc:6:59: error: 'a' was not declared in this scope
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                                           ^
a.cc:6:66: error: expected '}' before ';' token
    6 |         cin>>a[1][1]>>a[1][2]>>a[1][3]>>a[2][1]>>a[2][2]>>a[3][2];
      |                                                                  ^
a.cc:5:9: note: to match this '{'
    5 | int main{
      |         ^
a.cc:7:9: error: expected unqualified-id before 'if'
    7 |         if(a[1][1]==a[2][3] && a[1][2]==a[2][2] && a[1][3] ==a[2][3]){
      |         ^~
a.cc:10:9: error: expected unqualified-id before 'else'
   10 |         else{
      |         ^~~~
a.cc:13:1: error: expected declaration before '}' token
   13 | }
      | ^
Language: C++


#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<cstring>
#include<string>
#define ll long long
#define INF 0x3f3f3f3f
#define N 100005
using namespace std;
int main()
{
	char s[100],s1[100];
	scanf("%s%s",s,s1);
	strrev(s1);
	if(strcmp(s,s1)==0)
	printf("YES\n");
	else
	printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'strrev' was not declared in this scope; did you mean 'strsep'?
   15 |         strrev(s1);
      |         ^~~~~~
      |         strsep
Language: C++

#include<cstdio>
using namespace std;
int main()
{
	char A,B,C,D,E,F;
	scanf("%d%d%d",&A,&B,&C);
	printf("%d%d%d",A,B,C);
	scanf("%d%d%d",&D,&E,&F);
	printf("%d%d%d",D,E,F);
	if(a==f&&b==e&&c==d)
		printf("yes");
	else
		printf("no");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: 'a' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |            ^
a.cc:10:15: error: 'f' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |               ^
a.cc:10:18: error: 'b' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |                  ^
a.cc:10:21: error: 'e' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |                     ^
a.cc:10:24: error: 'c' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |                        ^
a.cc:10:27: error: 'd' was not declared in this scope
   10 |         if(a==f&&b==e&&c==d)
      |                           ^
Language: C++

nclude<cstdio>
char a[10][10];
int main()
{
	for(int n=0;n<2;n++)
	{
		for(int i=0;i<3;i++)
		{
			scnaf("%c",&a[n][i]);
		}
	}
	for(int n=0;n<2;n++)
	{
		for(int i=0;i<3;i++)
		{
			if(a[n][i]==a[n+1][i+2]&&a[n][i+1]==a[n+1][i+1]&&a[n][i+2]==a[n+1][i])
			printf("YES\n);
			else
			printf("NO\n);
		}
	}
	return 0;


Compiler output:
a.cc:17:32: warning: missing terminating " character
   17 |                         printf("YES\n);
      |                                ^
a.cc:17:32: error: missing terminating " character
   17 |                         printf("YES\n);
      |                                ^~~~~~~~
a.cc:19:32: warning: missing terminating " character
   19 |                         printf("NO\n);
      |                                ^
a.cc:19:32: error: missing terminating " character
   19 |                         printf("NO\n);
      |                                ^~~~~~~
a.cc:1:1: error: 'nclude' does not name a type
    1 | nclude<cstdio>
      | ^~~~~~
a.cc: In function 'int main()':
a.cc:9:37: error: 'a' was not declared in this scope
    9 |                         scnaf("%c",&a[n][i]);
      |                                     ^
a.cc:9:25: error: 'scnaf' was not declared in this scope
    9 |                         scnaf("%c",&a[n][i]);
      |                         ^~~~~
a.cc:16:28: error: 'a' was not declared in this scope
   16 |                         if(a[n][i]==a[n+1][i+2]&&a[n][i+1]==a[n+1][i+1]&&a[n][i+2]==a[n+1][i])
      |                            ^
a.cc:18:25: error: expected primary-expression before 'else'
   18 |                         else
      |                         ^~~~
a.cc:22:18: error: expected '}' at end of input
   22 |         return 0;
      |                  ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char st[5],st2[5];
int main()
{

   scanf("%s%s",st,st2);
    //puts(st);
    int flag=1;
    int len2=strlen(st2);
    for(int i=0; i<strlen(st); i++)
        if(st[i]!=st2[len2-i-1])
        {
            flag=0;
            break;
        }
    if(flag==0)
        cout<<"NO"<<endl;
    else cout<<"YES"<<endl;

    return 0;
}
#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char st[5],st2[5];
int main()
{

   scanf("%s%s",st,st2);
    //puts(st);
    int flag=1;
    int len2=strlen(st2);
    for(int i=0; i<strlen(st); i++)
        if(st[i]!=st2[len2-i-1])
        {
            flag=0;
            break;
        }
    if(flag==0)
        cout<<"NO"<<endl;
    else cout<<"YES"<<endl;

    return 0;
}


Compiler output:
a.cc:29:6: error: redefinition of 'char st [5]'
   29 | char st[5],st2[5];
      |      ^~
a.cc:5:6: note: 'char st [5]' previously declared here
    5 | char st[5],st2[5];
      |      ^~
a.cc:29:12: error: redefinition of 'char st2 [5]'
   29 | char st[5],st2[5];
      |            ^~~
a.cc:5:12: note: 'char st2 [5]' previously declared here
    5 | char st[5],st2[5];
      |            ^~~
a.cc:30:5: error: redefinition of 'int main()'
   30 | int main()
      |     ^~~~
a.cc:6:5: note: 'int main()' previously defined here
    6 | int main()
      |     ^~~~
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
	char s[100],s1[100];
	scanf("%s%s",s,s1);
	strrev(s1);
	if(strcmp(s,s1)==0)
	printf("YES\n");
	else
	printf("NO\n");
}

Compiler output:
main.c: In function 'main':
main.c:7:9: error: implicit declaration of function 'strrev'; did you mean 'strsep'? [-Wimplicit-function-declaration]
    7 |         strrev(s1);
      |         ^~~~~~
      |         strsep
Language: C++

#include <iostream>
    #include <cstdio>
    #include <cstring>
    using namespace std;
    char st[5],st2[5];
    int main()
    {
     
        gets(st);
        gets(st2);
        //puts(st);
        int flag=1;
        int len2=strlen(st2);
        for(int i=0; i<strlen(st); i++)
            if(st[i]!=st2[len2-i-1])
            {
                flag=0;
                break;
            }
        if(flag==0)
            cout<<"NO"<<endl;
        else cout<<"YES"<<endl;
     
        return 0;
    }

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

#include <cstdio>
int main()
{
	char a[10],b[10];
    for(int i = 1; i <= 3; i++)
	    scanf("%c", a[i]);

    for(int j = 1;j <= 3; j++)
	  	scanf("%c", b[j]);

	if(a[1]=b[3] && a[2]=b[2] && a[3]=b[1])
		printf("YES\n");
	else
		printf("NO\n");

	return 0;
	  	
		 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:35: error: lvalue required as left operand of assignment
   11 |         if(a[1]=b[3] && a[2]=b[2] && a[3]=b[1])
      |                              ~~~~~^~~~~~~
Language: C++

#include <stdio.h>
int main()
{
    char a[100],b[100];
    gets(a);
    gets(b);
    if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
    {
        printf("Yes");
    }
    else
    {
        printf("No");
    }
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:5:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 |     gets(a);
      |     ^~~~
      |     getw
Language: C++

#include<stdio.h>
main()
{
char  a,b,c,d,e,f;
printf("input c11,c12,c13,c21,c22,c23");
scanf("%c,%c,%c,%c,%c,%c"&a,&b,&c,&d,&e,&f);
if ((a = f)&&(b =e)&&(c = d))
printf("yes");
else
printf("no");
return 0;
}

Compiler output:
a.cc:2:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    2 | main()
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:26: error: invalid operands of types 'const char [18]' and 'char' to binary 'operator&'
    6 | scanf("%c,%c,%c,%c,%c,%c"&a,&b,&c,&d,&e,&f);
      |       ~~~~~~~~~~~~~~~~~~~^~
      |       |                   |
      |       const char [18]     char
Language: Java

public class Rotation {

	public static void main(String[] args) {
		char[][] x = new char[2][3];
		for(int i=0; i<args.length; i++){
			x[i] = args[i].toCharArray();
		}

		int p = 0;
		for(int j=0; j<3; j++){
			if(x[0][j] != x[1][2-j]){
				System.out.println("NO");
				p = 1;
				break;
			}
		}
		if(p == 0){
			System.out.println("YES");
		}


	}

}


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

#include<iostream>
#include<algorithm>
using namespace std;
int main(){
    string s,t;
    cin>>s>>t;
    if(s[0]==t[2]){
    if(s[1]==t[1]){
    if(s[2]==t[0]){
    cout<<"YES";break<<endl;
    }
    }
    }
      cout<<"NO"<<endl;
      return 0;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:17: error: break statement not within loop or switch
   10 |     cout<<"YES";break<<endl;
      |                 ^~~~~
a.cc:10:22: error: expected ';' before '<<' token
   10 |     cout<<"YES";break<<endl;
      |                      ^~
      |                      ;
a.cc:10:22: error: expected primary-expression before '<<' token
   10 |     cout<<"YES";break<<endl;
      |                      ^~
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
	char s[100],s1[100];
	scanf("%s%s",s,s1);
	if(strcmp(s,strrev(s1))==0)
	printf("YES\n");
	else
	printf("NO\n");
}

Compiler output:
main.c: In function 'main':
main.c:7:21: error: implicit declaration of function 'strrev'; did you mean 'strsep'? [-Wimplicit-function-declaration]
    7 |         if(strcmp(s,strrev(s1))==0)
      |                     ^~~~~~
      |                     strsep
main.c:7:21: error: passing argument 2 of 'strcmp' makes pointer from integer without a cast [-Wint-conversion]
    7 |         if(strcmp(s,strrev(s1))==0)
      |                     ^~~~~~~~~~
      |                     |
      |                     int
In file included from main.c:2:
/usr/include/string.h:156:50: note: expected 'const char *' but argument is of type 'int'
  156 | extern int strcmp (const char *__s1, const char *__s2)
      |                                      ~~~~~~~~~~~~^~~~
Language: C

#include <staio.h>
char a[3];
char b[3];
int main(void){
	scanf("%s",a);
	scanf("%s",b);
	if(a[1]=b[3] && a[2]=b[2] && a[3]=b[1]){
	printf("YES\n");
	}else{
	printf("NO\n");

	return 0
}

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

#include <iostream>
#include <string>
using namespace std;
int main(void)
{ 
  string first,sec;
  cin >> first;
  cin >> sec;
  reverse(first.begin(), first.end());
  if(first == sec)
    cout << "YES" << endl;
  else
   cout << "NO" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'reverse' was not declared in this scope
    9 |   reverse(first.begin(), first.end());
      |   ^~~~~~~
Language: C++

#include<stdio.h>
#include<string.h>
int main()
{
	char s[100],s1[100];
	scanf("%s%s",s,s1);
	if(strcmp(s,strrev(s1))==0)
	printf("YES\n");
	else
	printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:21: error: 'strrev' was not declared in this scope; did you mean 'strsep'?
    7 |         if(strcmp(s,strrev(s1))==0)
      |                     ^~~~~~
      |                     strsep
Language: C++

#include<stdio.h>
main()
{
char  a,b,c,d,e,f;
printf('input c11,c12,c13,c21,c22,c23");
scanf("%c,%c,%c,%c,%c,%c",&a,&b,&c,&d,&e,&f);
if ((a = f)&&(b =e)&&(c = d))
printf("yes");
else
printf("no");
return 0;
}

Compiler output:
a.cc:5:8: warning: missing terminating ' character
    5 | printf('input c11,c12,c13,c21,c22,c23");
      |        ^
a.cc:5:8: error: missing terminating ' character
    5 | printf('input c11,c12,c13,c21,c22,c23");
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
a.cc:2:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    2 | main()
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:45: error: expected ')' before ';' token
    6 | scanf("%c,%c,%c,%c,%c,%c",&a,&b,&c,&d,&e,&f);
      |                                             ^
      |                                             )
a.cc:5:7: note: to match this '('
    5 | printf('input c11,c12,c13,c21,c22,c23");
      |       ^
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char st[5],st2[5];
int main()
{

    gets(st);
    gets(st2);
    //puts(st);
    int flag=1;
    int len2=strlen(st2);
    for(int i=0; i<strlen(st); i++)
        if(st[i]!=st2[len2-i-1])
        {
            flag=0;
            break;
        }
    if(flag==0)
        cout<<"NO"<<endl;
    else cout<<"YES"<<endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |     gets(st);
      |     ^~~~
      |     getw
Language: C++

#include <stdio.h>
#include <math.h>
#include <string.h>
int main()
{
	int i,flag,l;
    char a[200];
    char b[200];
	while(gets(a)!=NULL)
	{
		flag=1;
		getchar();
		gets(b);
		l=strlen(a);
		for(i=0;i<l;i++)
		{
			if(a[i]==b[l-1-i])
			flag=0;
		}
		if(flag==1)
		printf("YES\n");
		else
		printf("NO\n");
		a[0]='\n';
		b[0]='\n';
		
	}
	
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |         while(gets(a)!=NULL)
      |               ^~~~
      |               getw
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
using namespace std;
char st[3],st2[3];
int main()
{

    gets(st);
    gets(st2);
    //puts(st);
    int flag=1;
    for(int i=0; i<strlen(st); i++)
        if(st[i]!=st2[2-i])
        {
            flag=0;
            break;
        }
    if(flag==0)
        cout<<"NO"<<endl;
    else cout<<"YES"<<endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |     gets(st);
      |     ^~~~
      |     getw
Language: C

#include <staio.h>
char a[3];
char b[3];
int main(void){
	scanf("%s",&a);
	scanf("%s",&b);
	if(a[1]=b[3] && a[2]=b[2] && a[3]=b[1]){
	printf("YES\n");
	}else{
	printf("NO\n");

	return 0
}

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

import java.util.Scanner;

public class Main {

    public static void main (String[] argv){

        Scanner scan = new Scanner (System.in);

        String original = scan.nextLine();
        String inverse  = scan.nextLine();

        if (isInverse(original, inverse)){
            System.out.println("YES");
        }
        else {
            System.out.println("NO");
        }
    }

    public static boolean isInverse (String s1, String s2){
        if (s1.length() != s2.length()) return false;

        for (int i = 0; i < s1.length(); i++){
            if (s1.charAt(i) != s2.charAt(s2.length() - 1 - i)) return false;
        }
        return true;
    }

}


Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.Scanner;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: expected unqualified-id before 'public'
    3 | public class Main {
      | ^~~~~~
Language: C++

#include<stdio.h>
#include<string.h>
#include<math.h>
#include<algorithm>
using namespace std;
int main(){
	__int64 a,i;
	while(scanf("%I64d",&a)!=EOF){
		for(i=1;i<=100000;i++){
			if(i*i<=a&&(i+1)*(i+1)>a){
				printf("%I64d\n",i*i);
				break;
			}
		}
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: '__int64' was not declared in this scope; did you mean '__ynf64'?
    7 |         __int64 a,i;
      |         ^~~~~~~
      |         __ynf64
a.cc:8:30: error: 'a' was not declared in this scope
    8 |         while(scanf("%I64d",&a)!=EOF){
      |                              ^
a.cc:9:21: error: 'i' was not declared in this scope
    9 |                 for(i=1;i<=100000;i++){
      |                     ^
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
#include <math.h>
using namespace std;

int main()
{
    double n;

    cin >> n;

    for (n ; n > 0 ; n++){
      if(sqrt(n)%1 == 0) cout << n << endl;
    }

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:17: error: invalid operands of types 'double' and 'int' to binary 'operator%'
   14 |       if(sqrt(n)%1 == 0) cout << n << endl;
      |          ~~~~~~~^~
      |              |   |
      |              |   int
      |              double
Language: C++

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

char mat[3][3];

int main() {
    for (int i = 0; i < 2; i++) {
        for (int j = 0; j <3; j++){
            cin >>mat[i][j];
        }
    }
    bool flag = false;
    if (mat[0][2] != mat[1][0]) flag = true;
    if (mat[0][0] ! =mat[1][3]) flag = true;
    if (mat[0][1] ! = mat[1][1]) flag = true;;
    if (flag) cout <<"NO" <<endl;
    else cout <<"YES" <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:18: error: expected ')' before '!' token
   14 |     if (mat[0][0] ! =mat[1][3]) flag = true;
      |        ~         ^~
      |                  )
a.cc:15:18: error: expected ')' before '!' token
   15 |     if (mat[0][1] ! = mat[1][1]) flag = true;;
      |        ~         ^~
      |                  )
Language: C++

#include <string.h>
#include <stdio.h>
#include <iostream>
using namespace std;
#define REP(i,n) for(int i=0; i< int(n); (i)++)
int main()
{
    char a[4]={0},b[4]={0};
    gets(a);
    gets(b);
    REP(i,3)
    {
        if(a[i]!=b[2-i])
        {
            cout << i << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |     gets(a);
      |     ^~~~
      |     getw
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main{
  string s,t;
  cin>>s>>t;
  if(s[1]==t[3]&&s[2]==t[2]&&s[3]==t[1])cout<<"Yes";
  else cout<<"No";
  return 0;
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:5:10: error: expected primary-expression before 's'
    5 |   string s,t;
      |          ^
a.cc:5:10: error: expected '}' before 's'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:6:3: error: 'cin' does not name a type
    6 |   cin>>s>>t;
      |   ^~~
a.cc:7:3: error: expected unqualified-id before 'if'
    7 |   if(s[1]==t[3]&&s[2]==t[2]&&s[3]==t[1])cout<<"Yes";
      |   ^~
a.cc:8:3: error: expected unqualified-id before 'else'
    8 |   else cout<<"No";
      |   ^~~~
a.cc:9:3: error: expected unqualified-id before 'return'
    9 |   return 0;
      |   ^~~~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: Java

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 文字列の入力
		char ch1[];
		char ch2[];
		String str1 = sc.next();
		ch1=str1.toCharArray();

		String str2 = sc.next();
		ch2=str2.toCharArray();
		// 出力

		for(int i=0;i<ch1.length;i++){
			if(ch1[i]!=ch2[ch2.length-i-1]) {
				System.out.println("NO");
				System.exit(0);
			}
		}
		System.out.println("YES");
	}


Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
	public static void main(String[] args){
	              ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: C++

#include <iostream>
using namespace std;
#define REP(i,n) for(int i=0; i< int(n); (i)++)
int main()
{
    char a[4]={0},b[4]={0};
    gets(a);
    gets(b);
    REP(i,3)
    {
        if(a[i]!=b[2-i])
        {
            cout << i << "NO" << endl;
            return 0;
        }
    }
    cout << "YES" << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |     gets(a);
      |     ^~~~
      |     getw
Language: C++

#include <string.h>
#include <cstring>
#include <iostream>
using namespace std;

int main()
{
	string a,b;
	cin>>a;
	cin>>b;
	reverse(a.begin(),a.end());
	if(a==b)
		cout<<"YES";
	else
		cout<<"NO";
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'reverse' was not declared in this scope
   11 |         reverse(a.begin(),a.end());
      |         ^~~~~~~
Language: C++

#include<iostream>
#include<string>
#include<cstring>
using namespace std;
const int m = 200010;
char s1[m], s2[m];
bool dfs(char *a,char *b,int n)
{
   if (strncmp(a, b, n) == 0)              //比较字符串
       return true;
   if (n % 2 != 0)                          //判断字符串长度为偶数还是奇数
       return false;
   int len = n / 2;                        //平分字符串
   
   if (dfs(a, b + len, len) && dfs(a + len, b, len))
       return true;                                    
   if (dfs(a, b, len) && dfs(a + len, b + len, len))    //拆分后的字符串比较
       return true;
   return false;
}
int main()
{
    cin >> s1;
    cin >> s2;
    cout <<( dfs(s1, s2, strlen(s1)) ? "YES" : "NO") << endl;   
    return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:26:14: error: expected '}' at end of input
   26 |     return 0;
      |              ^
a.cc:22:1: note: to match this '{'
   22 | {
      | ^
Language: Java

import java.util.Scanner;

public class q1 {

	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// 文字列の入力
		char ch1[];
		char ch2[];
		String str1 = sc.next();
		ch1=str1.toCharArray();

		String str2 = sc.next();
		ch2=str2.toCharArray();
		// 出力

		for(int i=0;i<ch1.length;i++){
			if(ch1[i]!=ch2[ch2.length-i-1]) {
				System.out.println("NO");
				System.exit(0);
			}
		}
		System.out.println("YES");
	}

}


Compiler output:
Main.java:3: error: class q1 is public, should be declared in a file named q1.java
public class q1 {
       ^
1 error
Language: C

#include<iostream>
#include<string>
#include<cstring>
using namespace std;
const int m = 200010;
char s1[m], s2[m];
bool dfs(char *a,char *b,int n)
{
   if (strncmp(a, b, n) == 0)              //比较字符串
       return true;
   if (n % 2 != 0)                          //判断字符串长度为偶数还是奇数
       return false;
   int len = n / 2;                        //平分字符串
   
   if (dfs(a, b + len, len) && dfs(a + len, b, len))
       return true;                                    
   if (dfs(a, b, len) && dfs(a + len, b + len, len))    //拆分后的字符串比较
       return true;
   return false;
}
int main()
{
    cin >> s1;
    cin >> s2;
    cout <<( dfs(s1, s2, strlen(s1)) ? "YES" : "NO") << endl;   
    return 0;

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

#include <iostream>
using namespace std;

int main() {
	string s1,s2;
	cin>>s1>>s2;
	for(int i=0;i<3;i++)
	if(s[i]!=s[2-i])
	{
		cout<<"NO";
		return 0
	}
	cout<<"YES";
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:12: error: 's' was not declared in this scope
    8 |         if(s[i]!=s[2-i])
      |            ^
a.cc:11:25: error: expected ';' before '}' token
   11 |                 return 0
      |                         ^
      |                         ;
   12 |         }
      |         ~
Language: C++

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

int main()
{
    string c１,c2;

    cin >> c1 >> c2;

    reverse(c1.begin(), c1.end());

    if (c1 == c2){
      cout << "YES" << endl;
    } else {
      cout << "NO" << endl;
    }

    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: 'c1' was not declared in this scope; did you mean 'c2'?
   10 |     cin >> c1 >> c2;
      |            ^~
      |            c2
Language: C++

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

char g[5][5];
char og[5][5];

int main()
{
    gets(g[0]);
    gets(g[1]);

    if(g[0][0] == g[1][2] && g[0][1] == g[1][1] && g[0][2] == g[1][0])
        printf("YES\n");
    else
        printf("NO\n");
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |     gets(g[0]);
      |     ^~~~
      |     getw
Language: C++

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

int main()
{
    string string c１,c2;

    cin >> c1 >> c2;

    reverse(c1.begin(), c1.end());

    if (c1 == c2){
      cout << "YES" << endl;
    } else {
      cout << "NO" << endl;
    }

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: expected initializer before 'c\U0000ff11'
    8 |     string string c１,c2;
      |                   ^~~
a.cc:10:12: error: 'c1' was not declared in this scope
   10 |     cin >> c1 >> c2;
      |            ^~
a.cc:10:18: error: 'c2' was not declared in this scope
   10 |     cin >> c1 >> c2;
      |                  ^~
Language: C

#include <stdio.h>
int main(){
  char a[4],b[4];
  scanf("%s\n%s",a,b);
  for(int i=0;i<3;i++){
    if(a[i]!=b[2-i]){
      printf("NO");
      return 0;
    }
  }
  printf8("YES");
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:3: error: implicit declaration of function 'printf8'; did you mean 'printf'? [-Wimplicit-function-declaration]
   11 |   printf8("YES");
      |   ^~~~~~~
      |   printf
Language: C++

#include "stdio.h"
#include "string.h"
int main(){
	char c,a[3],b[3];
	gets(a);
	gets(b);
	if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])printf("YES\n");
	else printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main{
  string s,t;
  cin>>s1>>s2;
  if(s[1]==t[3]&&s[2]==t[2]&&s[3]==t[1])cout<<"Yes";
  else cout<<"No";
  return 0;
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:5:10: error: expected primary-expression before 's'
    5 |   string s,t;
      |          ^
a.cc:5:10: error: expected '}' before 's'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:6:3: error: 'cin' does not name a type
    6 |   cin>>s1>>s2;
      |   ^~~
a.cc:7:3: error: expected unqualified-id before 'if'
    7 |   if(s[1]==t[3]&&s[2]==t[2]&&s[3]==t[1])cout<<"Yes";
      |   ^~
a.cc:8:3: error: expected unqualified-id before 'else'
    8 |   else cout<<"No";
      |   ^~~~
a.cc:9:3: error: expected unqualified-id before 'return'
    9 |   return 0;
      |   ^~~~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main{
  string s1,s2;
  cin>>s1>>s2;
  if(s1[1]==s2[3]&&s1[2]==s2[2]&&s1[3]==s[1])cout<<"Yes";
  else cout<<"No";
  return 0;
}

Compiler output:
a.cc:4:5: error: cannot declare '::main' to be a global variable
    4 | int main{
      |     ^~~~
a.cc:5:10: error: expected primary-expression before 's1'
    5 |   string s1,s2;
      |          ^~
a.cc:5:10: error: expected '}' before 's1'
a.cc:4:9: note: to match this '{'
    4 | int main{
      |         ^
a.cc:6:3: error: 'cin' does not name a type
    6 |   cin>>s1>>s2;
      |   ^~~
a.cc:7:3: error: expected unqualified-id before 'if'
    7 |   if(s1[1]==s2[3]&&s1[2]==s2[2]&&s1[3]==s[1])cout<<"Yes";
      |   ^~
a.cc:8:3: error: expected unqualified-id before 'else'
    8 |   else cout<<"No";
      |   ^~~~
a.cc:9:3: error: expected unqualified-id before 'return'
    9 |   return 0;
      |   ^~~~~~
a.cc:10:1: error: expected declaration before '}' token
   10 | }
      | ^
Language: C++

#include <queue>
#include <set>
#include <string>
#include <unordered_map>
#include <vector>

using namespace std;

using ll = long long;

string A, B;
string ans = "YES";

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

    for (int i = 0; i < 3; i++) {
        if (A[i] != B[2 - i]) { ans = "NO"; break; }
    }

    cout << ans << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: 'cin' was not declared in this scope
   15 |     cin >> A;
      |     ^~~
a.cc:5:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    4 | #include <unordered_map>
  +++ |+#include <iostream>
    5 | #include <vector>
a.cc:22:5: error: 'cout' was not declared in this scope
   22 |     cout << ans << endl;
      |     ^~~~
a.cc:22:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:22:20: error: 'endl' was not declared in this scope
   22 |     cout << ans << endl;
      |                    ^~~~
a.cc:5:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    4 | #include <unordered_map>
  +++ |+#include <ostream>
    5 | #include <vector>
Language: C++

#include <stdio.h>
int main()
{
    char a[4],b[4];
    gets(a);
    gets(b);
    if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
    {
        printf("Yes\n");
    }
    else
    {
        printf("No\n");
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 |     gets(a);
      |     ^~~~
      |     getw
Language: C

#include<stdio.h>
#include<string.h>
int main()
{
    int i,l,x=1;
    char a[10],b[20];
    scanf("%s",a);
    scanf("%s",b);
    l=strlen(a);
    for(i=0;i<l;i++)
    {
        if(a[i]!=b[l-i]) x=0;
    }
    if(x==1) printf("YES\n") 
        else printf("NO\n");
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:14:29: error: expected ';' before 'else'
   14 |     if(x==1) printf("YES\n")
      |                             ^
      |                             ;
   15 |         else printf("NO\n");
      |         ~~~~
Language: C++

#include<stdio.h>
int main(){
	char a[3],b[3];
	int i;
	gets(a);gets(b);
	if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0]) printf("YES\n");
	else printf("NO\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    5 |         gets(a);gets(b);
      |         ^~~~
      |         getw
Language: C++

#include <cstdio>
#include <cstring>
#include <cmath>
#include <cstdlib>
#include <algorithm>
#include <iostream.h>
using namespace std;

int main()
{
	char a[5], b[5];
	cin >>a + 1;
	cin >>b + 1;
	if (a[1] == b[3] && a[2] == b[2] && a[3] == b[1])
		cout <<"YES" <<endl;
	else cout <<"NO" <<endl;
	return 0;
}

Compiler output:
a.cc:6:10: fatal error: iostream.h: No such file or directory
    6 | #include <iostream.h>
      |          ^~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
#include <string>

using namespaces std;

int main() {
string a;
string b;
cin >> a >> b;
bool ans = true;
for (int i = 0; i < 3;i++) {
if (a[i] != b[3 - i]) {
goto a;
}
}
a:ans = false;
if (ans) {
cout << "YES";
}
else {
cout << "NO";
}
}

Compiler output:
a.cc:4:7: error: expected nested-name-specifier before 'namespaces'
    4 | using namespaces std;
      |       ^~~~~~~~~~
a.cc: In function 'int main()':
a.cc:7:1: error: 'string' was not declared in this scope
    7 | string a;
      | ^~~~~~
a.cc:7:1: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:8:7: error: expected ';' before 'b'
    8 | string b;
      |       ^~
      |       ;
a.cc:9:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 | cin >> a >> b;
      | ^~~
      | std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:9:8: error: 'a' was not declared in this scope
    9 | cin >> a >> b;
      |        ^
a.cc:9:13: error: 'b' was not declared in this scope
    9 | cin >> a >> b;
      |             ^
a.cc:18:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 | cout << "YES";
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:21:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 | cout << "NO";
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include<iostream>
using namespace std;
int main(void){
  string s[2];
  string ss[2];
  cin>>s[0];
  cin>>s[1];
  for(int i=0;i<2;i++){
    for(int j=0;j<3;j++){
      if(s[1-i][2-j]!=s[i][j]){
        cout<<"NO"<<endl;
        return 0;
      }
    }
  }
  cout<<"YES"<<endl;
  retrn 0;
}
  

Compiler output:
a.cc: In function 'int main()':
a.cc:17:3: error: 'retrn' was not declared in this scope
   17 |   retrn 0;
      |   ^~~~~