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

import java.util.*;
public class Main {
	public static void main(String[] args){
      	//データ取り込み
		Scanner sc = new Scanner(System.in);
      	String a = sc.next();
      String b = sc.next();
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
     	System.out.println("YES");
      }else{
      System.out.println("NO");
      }
		
    }
}

Compiler output:
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
          ^
  symbol:   variable charAt
  location: variable a of type String
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
                       ^
  symbol:   variable charAt
  location: variable b of type String
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
                                     ^
  symbol:   variable charAt
  location: variable a of type String
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
                                                  ^
  symbol:   variable charAt
  location: variable b of type String
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
                                                               ^
  symbol:   variable charAt
  location: variable a of type String
Main.java:8: error: cannot find symbol
      if(a.charAt[0]==b.charAt[2]&& a.charAt[1]==b.charAt[1]&&a.charAt[2]==b.charAt[0]){
                                                                            ^
  symbol:   variable charAt
  location: variable b of type String
6 errors
Language: C

#include<stdio.h>
#include<string.h>
int main(void){
    int A,B,C,D,E,x,y,cou=0,v[3];
    char S[3],s[3],X,Y;
    scanf("%s%s",&S,&s);
   if((S[0]==s[2])&&(S[1]==s[1])&&(S[2]==s[0]){
            printf("YES");
    }else{
        printf("NO");
    }
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:47: error: expected ')' before '{' token
    7 |    if((S[0]==s[2])&&(S[1]==s[1])&&(S[2]==s[0]){
      |      ~                                        ^
      |                                               )
main.c:13:1: error: expected expression before '}' token
   13 | }
      | ^
Language: C++

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

int main(){
    char a, b, c, d, e, f;
  cin >> a >> b >> c >> d >> e >> f;
  if (a == f && b == e && c == d) {
    cout << "YES" << endl;
  }
  else {
    cout "NO" << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: expected ';' before string constant
   11 |     cout "NO" << endl;
      |         ^~~~~
      |         ;
Language: C++

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

int main (){
  string a,s,d,f,g,h;
  cin >> a >> s >> d >> f >> g >> h:
  
  if(a==h&&s==g&&d==f){
    cout << "YES";
  }else{
    cout << "NO";
  }
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:6:36: error: expected ';' before ':' token
    6 |   cin >> a >> s >> d >> f >> g >> h:
      |                                    ^
      |                                    ;
a.cc:10:4: error: 'else' without a previous 'if'
   10 |   }else{
      |    ^~~~
Language: C++

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

int main(){
  char str1[3];
  char str2[3];
  cin >> str1 >> str2;
  if(str1[0]==str2[2] && str1[1]==str2[1] && str1[2]==str2[0]){
    cout << "YES" << endl;
  }else{
    cout <<< "NO" << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: expected primary-expression before '<' token
   11 |     cout <<< "NO" << endl;
      |            ^
a.cc:11:19: error: invalid operands of types 'const char [3]' and '<unresolved overloaded function type>' to binary 'operator<<'
   11 |     cout <<< "NO" << endl;
      |              ~~~~~^~~~~~~
Language: C++

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



int main(){
	
	vector<char> c(n);
	for(int i = 0; i < 6; i++)
	{
		cin >> c[i];
	}
	
	string ans = "NO";
	if(c[0] == c[5] && c[1] == c[4] && c[2] == c[3]) ans = "YES";
	cout << ans << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:24: error: 'n' was not declared in this scope
    8 |         vector<char> c(n);
      |                        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main () {
	string s1,s2;
	cin >> s1 >> s2;
	char tmp = s1[0];
	s1[0] = s1[2];
	s1[2] tmp;
	if(s1 == s2){
		cout << "YES" << endl;
	}else{
		cout << "NO" << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: expected ';' before 'tmp'
    8 |         s1[2] tmp;
      |              ^~~~
      |              ;
a.cc:8:13: warning: ignoring return value of 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[](size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; reference = char&; size_type = long unsigned int]', declared with attribute 'nodiscard' [-Wunused-result]
    8 |         s1[2] tmp;
      |             ^
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1265:7: note: declared here
 1265 |       operator[](size_type __pos)
      |       ^~~~~~~~
Language: C++

using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: 'cin' was not declared in this scope
    7 |       cin>>a[i][j];
      |       ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:10:64: error: 'cout' was not declared in this scope
   10 |   if(a[0][0]==a[1][2] && a[0][1]==a[1][1] && a[0][2]==a[1][0]) cout<<"YES"<<endl;
      |                                                                ^~~~
a.cc:10:64: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:10:77: error: 'endl' was not declared in this scope
   10 |   if(a[0][0]==a[1][2] && a[0][1]==a[1][1] && a[0][2]==a[1][0]) cout<<"YES"<<endl;
      |                                                                             ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
a.cc:11:8: error: 'cout' was not declared in this scope
   11 |   else cout<<"NO"<<endl;
      |        ^~~~
a.cc:11:8: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:11:20: error: 'endl' was not declared in this scope
   11 |   else cout<<"NO"<<endl;
      |                    ^~~~
a.cc:11:20: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

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

int main() {
  vector<char> c(6);
  for(int i=0;i<6;i++)
    cin>>c.at(i);
  if(c[i]==c[5] && c.at(1)==c.at(4) && c.at(2)==c.at(3))
    cout<<"YES";
  else cout<<"NO";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: 'i' was not declared in this scope
    8 |   if(c[i]==c[5] && c.at(1)==c.at(4) && c.at(2)==c.at(3))
      |        ^
Language: C++

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

int main() {
  vector<char> c(6);
  for(int i=0;i<6;i++)
    cin>>c[i];
  if(c[i]==c[5] && c.at(1)==c.at(4) && c.at(2)==c.at(3))
    cout<<"YES";
  else cout<<"NO";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: 'i' was not declared in this scope
    8 |   if(c[i]==c[5] && c.at(1)==c.at(4) && c.at(2)==c.at(3))
      |        ^
Language: C

#include <stdio.h>
#include <string.h>
#include <math.h>
int main()
{
    char s[4],l[4];

    while (~scanf ("%s%s",&s,&l))
    {
        int t=0;
        for (int i=2; i>=0; i--)
        {
            for(int j=0; j<3; j++)
                if(s[i]==l[j])
                    t++;
        }
        if(t==n)
        {
            printf("YES");
        }
        else
        {
            printf ("NO");
        }
    }
}

Compiler output:
main.c: In function 'main':
main.c:17:15: error: 'n' undeclared (first use in this function)
   17 |         if(t==n)
      |               ^
main.c:17:15: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <cstdio>
#include <cstdlib>
#include <cstring>
using namespace std;
int main()
{
    char a[10],b[10],c[10];
        int i,j;
         memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        memset(c,0,sizeof(c));
        gets(a);
        gets(b);
        int len=strlen(b);
        for (i=0,j=len-1;i<len,j>=0 ;i++,j--)
        {
            c[i]=b[j];
        }
        if(strcmp(a,c)==0)
            printf("YES\n");
        else
            printf("NO\n");
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   12 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
using namespace std;
int main()
{
    char a[10],b[10],c[10];
        int i,j;
         memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        memset(c,0,sizeof(c));
        gets(a);
        gets(b);
        int len=strlen(b);
        for (i=0,j=len-1;i<len,j>=0 ;i++,j--)
        {
            c[i]=b[j];
        }
        if(strcmp(a,c)==0)
            printf("YES\n");
        else
            printf("NO\n");
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   12 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

#include<iostream>
#include<cstdio>
#include<cstring>
#include<bits/stdc++.h>
#define _ cin.tie(0);ios::sync_with_stdio(false);
using namespace std;
int main()
{
string a, t;
    while(cin >> a >> t)
    {
        reverse(a.begin(), a.end());
        if(a == t)
            printf("YES\n");
            printf("This grid remains the same when rotated 180 degrees.");
        else
            printf("NO\n");
            printf("This grid remains the same when rotated 180 degrees.");
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:9: error: 'else' without a previous 'if'
   16 |         else
      |         ^~~~
Language: C++

#include<cstdio>
#include<cstring>
#include<algorithm>
using namespace std;
int main()
{
    char s1[200],s2[200];
    while(gets(s1)!=NULL)
    {
        gets(s2);
        int sum = 0,mi;
        int l1 = strlen(s1);
        int l2 = strlen(s2);
        sort(s1,s1+l1);
        sort(s2,s2+l2);
        if(l1<l2)
        {
            mi = l1;
        }
        else
        {
            mi = l2;
        }
        for(int i=0; i<l1; i++)
        {
            if(s1[i]==s2[i])
            {
                sum++;
            }
        }
        if(sum==mi)
        {
            printf("YES\n");
        }
        else
        {
            printf("NO\n");
        }
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |     while(gets(s1)!=NULL)
      |           ^~~~
      |           getw
Language: C++

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string.h>
#include <math.h>
using namespace std;
int main()
{
    char a[10],b[10],c[10];
    while(1)
    {
        memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        memset(c,0,sizeof(c));
        int i,j;
        gets(a);
        gets(b);
        int len=strlen(b);
        for (i=0,j=len-1;i<len,j>=0 ;i++,j--)
        {
            c[i]=b[j];
        }
        if(strcmp(a,c)==0)
            printf("YES\n");
        else
            printf("NO\n");
        memset(a,0,sizeof(a));
        memset(b,0,sizeof(b));
        memset(c,0,sizeof(c));
    }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   17 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <math.h>
#include <string.h>
#include <time.h>
#include <queue>
using namespace std;
int main()
{
    char ch1[4];
    char ch2[4];
    char ch3[4]={0};//1
    char ch4[4]={0};//2
    gets(ch1);
    gets(ch2);
    int i;
    for(i=0; i<3; i++)
    {
        ch3[i]=ch1[2-i];
        ch4[i]=ch2[2-i];
    }
    if(strcmp(ch3,ch2)==0&&strcmp(ch4,ch1)==0)
    {
        printf("YES\n");
    }
    if(strcmp(ch3,ch2)!=0||strcmp(ch4,ch1)!=0)
    {
        printf("NO\n");
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   15 |     gets(ch1);
      |     ^~~~
      |     getw
Language: C++

#include <iostream>
#include <queue>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cstring>
#include <vector>
# include<stdio.h>
#include<cmath>
#include<math.h>
#include<iostream>
#include <iostream>
using namespace std;
int i,j;
    char a[N][N];
    for(i=1; i<3; i++)
    {
        for(j=1; j<4; j++)
        {
            scanf("%c",&a[i][j]);
        }
        getchar();
    }
    if(a[1][1]==a[2][3]&&a[1][2]==a[2][2]&&a[1][3]==a[2][1])
    {
        printf("YES\n");
    }
    else 
    {
        printf("NO\n");
        
    }
    


    return 0;
}

Compiler output:
a.cc:15:12: error: 'N' was not declared in this scope
   15 |     char a[N][N];
      |            ^
a.cc:15:15: error: 'N' was not declared in this scope
   15 |     char a[N][N];
      |               ^
a.cc:16:5: error: expected unqualified-id before 'for'
   16 |     for(i=1; i<3; i++)
      |     ^~~
a.cc:16:14: error: 'i' does not name a type
   16 |     for(i=1; i<3; i++)
      |              ^
a.cc:16:19: error: 'i' does not name a type
   16 |     for(i=1; i<3; i++)
      |                   ^
a.cc:24:5: error: expected unqualified-id before 'if'
   24 |     if(a[1][1]==a[2][3]&&a[1][2]==a[2][2]&&a[1][3]==a[2][1])
      |     ^~
a.cc:28:5: error: expected unqualified-id before 'else'
   28 |     else
      |     ^~~~
a.cc:36:5: error: expected unqualified-id before 'return'
   36 |     return 0;
      |     ^~~~~~
a.cc:37:1: error: expected declaration before '}' token
   37 | }
      | ^
Language: C++

#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
char s1[100],s2[100];
int main()
{
    int temp,ans;
    gets(s1);
    gets(s2);
    for(int i=0; i<strlen(s1)-1; i++)
    {
        ans=i;
        for(int j=i+1; j<strlen(s1); j++)
        {
            if(s1[j]>s1[ans])
            {
                ans=j;
            }
        }
        if(ans!=i)
        {
            temp=s1[ans];
            s1[ans]=s1[i];
            s1[i]=temp;
        }
    }
    for(int i=0; i<strlen(s2)-1; i++)
    {
        ans=i;
        for(int j=i+1; j<strlen(s2); j++)
        {
            if(s2[j]>s2[ans])
            ans=j;
        }
        if(ans!=i)
        {
            temp=s2[ans];
            s2[ans]=s2[i];
            s2[i]=temp;
        }
    }
    if(strcmp(s1,s2)==0)
    {
        printf("YES\n");
        printf("This grid remains the same when rotated 180 degrees.\n");
    }
    else
    {
        printf("NO\n");
        printf("This grid does not remain the same when rotated 180 degrees.\n");
    }
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   10 |     gets(s1);
      |     ^~~~
      |     getw
Language: C++

#include<stdio.h>
#include<string.h>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    char a[6],b[6];
    gets(a);
    gets(b);
    if(a[0]==b[2]&&a[2]==b[0]&&a[1]==b[1])
        printf("YES");
    else
        printf("NO");
        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 <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string.h>
using namespace std;
char b[4],c[4],d[4];
int main()
{
    memset(b,'\0',sizeof(b));
    memset(c,'\0',sizeof(c));
    memset(d,'\0',sizeof(d));
    gets(b);
    gets(c);
    int len =strlen (c);
    int i,j;
    for ( i=0,j=len-1; i<len,j>=0 ; i++,j--)
    {
        d[i]=c[j];
    }
    if(strcmp(d,b)==0)
    {
        printf("YES\n");
    }
    else if (strcmp(d,b)!=0)
    {
        printf("NO\n");
    }
    memset(b,'\0',sizeof(b));
    memset(c,'\0',sizeof(c));
    memset(d,'\0',sizeof(d));
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   13 |     gets(b);
      |     ^~~~
      |     getw
Language: C++

#include<stdio.h>
#include<string.h>
#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
    char a[6],b[6];
    gets(a);
    gets(b);
    if(a[0]==b[2]&&a[2]==b[0]&&a[1]==b[1])
        printf("YES");
    else
        printf("NO");
        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 <cstdio>
#include <cstdlib>
#include <algorithm>
#include <string.h>
using namespace std;
char a[2][3];
char b[4],c[4],d[4];
int main()
{
    gets(b);
    gets(c);
    int len =strlen (c);
    int i,j;
    for ( i=0,j=len-1; i<len,j>=0 ; i++,j--)
    {
        d[i]=c[j];
    }
    if(strcmp(d,b)==0)
    {
        printf("YES\n");
    }
    else if (strcmp(d,b)!=0)
    {
        printf("NO\n");
    }
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   11 |     gets(b);
      |     ^~~~
      |     getw
Language: C++

#include <iostream>
#include <algorithm>
#include <cstring>
#include <cstdio>
#include <cstdlib>

using namespace std;
char s[10000];
char s1[10000];


int main()
{
    while(gets(s)!=NULL&&gets(s1)!=NULL)
    {
     int j=0;
     int length=strlen(s);
     //printf("%c\n",s[length]);
     for(int i=length-1;i>=0;i--)
     {
         if(s1[j]!=s[i])
         {
             printf("NO\n");
             return 0;
         }
         j++;
     }
     printf("YES\n");
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:11: error: 'gets' was not declared in this scope; did you mean 'getw'?
   14 |     while(gets(s)!=NULL&&gets(s1)!=NULL)
      |           ^~~~
      |           getw
Language: C

#include <iostream>
#include<cstdio>
using namespace std;
int main()
{
   char a[5],b[5];
  while(~scanf("%s%s",a,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:
main.c:1:10: fatal error: iostream: No such file or directory
    1 | #include <iostream>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

#include <string.h>
#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <vector>
#include <map>
#include<math.h>
#include<stack>
using namespace std;
int main()
{
    char c[10];
    char b[20];
    gets(c);
    gets(b);
    int flag=1;
    if(c[0]!=b[2])flag=0;
    if(c[1]!=b[1])flag=0;
    if(c[2]!=b[0])flag=0;
    if(flag==1)
        printf("YES\nThis grid remains the same when rotated 180 degrees.\n");
    else
        printf("NO\nThis grid does not remain the same when rotated 180 degrees.\n");
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   14 |     gets(c);
      |     ^~~~
      |     getw
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<map>
using namespace std;
#define ll long long
int main(){
    str c1,c2;
    cin >> c1 >> c2;
    if(c1[0]==c2[2]){
      cout << "N0";
      return 0;
    }
    if(c1[1]==c2[1]){
      cout << "N0";
      return 0;
    }
    if(c1[2]==c2[0]){
      cout << "N0";
      return 0;
    }
    cout << "YES";
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'str' was not declared in this scope; did you mean 'std'?
   12 |     str c1,c2;
      |     ^~~
      |     std
a.cc:13:12: error: 'c1' was not declared in this scope
   13 |     cin >> c1 >> c2;
      |            ^~
a.cc:13:18: error: 'c2' was not declared in this scope
   13 |     cin >> c1 >> c2;
      |                  ^~
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<iomanip>
#include<algorithm>
#include<queue>
#include<stack>
#include<map>
using namespace std;
#define ll long long
int main(){
    str c1,c2;
    cin >> c1 >> c2;
    if(c1[0]==c2[2]){
      cout << "N0"
      return 0;
    }
    if(c1[1]==c2[1]){
      cout << "N0"
      return 0;
    }
    if(c1[2]==c2[0]){
      cout << "N0"
      return 0;
    }
    cout << "YES";
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 'str' was not declared in this scope; did you mean 'std'?
   12 |     str c1,c2;
      |     ^~~
      |     std
a.cc:13:12: error: 'c1' was not declared in this scope
   13 |     cin >> c1 >> c2;
      |            ^~
a.cc:13:18: error: 'c2' was not declared in this scope
   13 |     cin >> c1 >> c2;
      |                  ^~
a.cc:15:19: error: expected ';' before 'return'
   15 |       cout << "N0"
      |                   ^
      |                   ;
   16 |       return 0;
      |       ~~~~~~       
a.cc:19:19: error: expected ';' before 'return'
   19 |       cout << "N0"
      |                   ^
      |                   ;
   20 |       return 0;
      |       ~~~~~~       
a.cc:23:19: error: expected ';' before 'return'
   23 |       cout << "N0"
      |                   ^
      |                   ;
   24 |       return 0;
      |       ~~~~~~
Language: C++

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

int main()
{
	string s, t;
	cin >> s >> t;
	reverse(s.begin(), s.end());
	if (s == t) {
		cout << "YES" << endl;
	}
	else {
		cout << "NO" << endl;
	}
}

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

#include<stdio.h>

int main(){
  char s1, s2;
  
  scanf("%s %s", s1, s2);
  
  if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
    printf("YES\n");
  } else {
    printf("NO\n");
  }
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:8: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |        ^
main.c:8:17: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |                 ^
main.c:8:26: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |                          ^
main.c:8:35: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |                                   ^
main.c:8:44: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |                                            ^
main.c:8:53: error: subscripted value is neither array nor pointer nor vector
    8 |   if(s1[0] == s2[2] && s1[1] == s2[1] && s1[2] == s2[0]){
      |                                                     ^
Language: C++

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

#define rep(i, n) for(int i = 0; i < (int)(n); i++)
#define repi(i,a,b) for(int i = (int)(a); i < (int)(b); i++)
#define in(x) cin >> x
#define out(str) cout << str << endl

template<class T>bool chmax(T &a, const T &b) { if (a<b) { a=b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b) { if (b<a) { a=b; return 1; } return 0; }

char c[2][3]:

int main(){
  rep(i,2){
      rep(j,3){
          cin>>c[i][j];
      }
  }
  rep(i,3){
      if(c[0][i]==c[1][2-i]){
          out("NO");
          return 0;
      }
  }
  out("YES");  
}


Compiler output:
a.cc:21:13: error: expected initializer before ':' token
   21 | char c[2][3]:
      |             ^
Language: C++

#include<bits/stdc++>
using namespace std;
int main(){
  string s,t;
  cin >> s >> t;
  reverse(t.begin(),t.end());
  cout << (s==t? "YES":"NO") << endl;
}

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

#include <bits/stdc++.h>
#define repd(i,a,b) for (int i=(a);i<(b);i++)
#define rep(i,n) repd(i,0,n)
typedef long long ll;
using namespace std;
const int MOD = 1000000007;
const int INF = 1010000000;
const double EPS = 1e-10;

int h,w,x;
char s[1000][1000];
bool visited [1000][1000];
pair<int,int> start,goal;
queue<pair<int,pair<int,int>>> q;
vector<pair<int,int>> ino;

int main(){
  string a,b,c,d;cin >>a>>b>>c>>d;
  a.reverse();
  if(a==b){
    cout << "YES" << endl;
  }else{
    cout << "NO";
  }
}



Compiler output:
a.cc: In function 'int main()':
a.cc:19:5: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'reverse'; did you mean 'reserve'?
   19 |   a.reverse();
      |     ^~~~~~~
      |     reserve
Language: C++

a = input()
b = input()
if (a[0]==b[2]) and (a[1]==b[1]) and (a[2]==b[0]):
    print('YES')
else:
    print('NO')

Compiler output:
a.cc:4:11: warning: multi-character character constant [-Wmultichar]
    4 |     print('YES')
      |           ^~~~~
a.cc:6:11: warning: multi-character character constant [-Wmultichar]
    6 |     print('NO')
      |           ^~~~
a.cc:1:1: error: 'a' does not name a type
    1 | a = input()
      | ^
Language: C++

#include <cstdlib>
#include <cmath>
#include <climits>
#define endl '\n'
#define ll long long

using namespace std;


int main(void)
{
        cin.tie(NULL); ios_base::sync_with_stdio(false);
        string str1, str2; cin >> str1 >> str2;

        if(str1[1] != str2[1])
                cout << "NO";
        else if(str1[0] == str2[2])
                cout << "YES";
        else
                cout << "NO";

        return 0;
}       


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'cin' was not declared in this scope
   12 |         cin.tie(NULL); ios_base::sync_with_stdio(false);
      |         ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <climits>
  +++ |+#include <iostream>
    4 | #define endl '\n'
a.cc:12:24: error: 'ios_base' has not been declared
   12 |         cin.tie(NULL); ios_base::sync_with_stdio(false);
      |                        ^~~~~~~~
a.cc:13:9: error: 'string' was not declared in this scope
   13 |         string str1, str2; cin >> str1 >> str2;
      |         ^~~~~~
a.cc:4:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
    3 | #include <climits>
  +++ |+#include <string>
    4 | #define endl '\n'
a.cc:13:35: error: 'str1' was not declared in this scope
   13 |         string str1, str2; cin >> str1 >> str2;
      |                                   ^~~~
a.cc:13:43: error: 'str2' was not declared in this scope
   13 |         string str1, str2; cin >> str1 >> str2;
      |                                           ^~~~
a.cc:16:17: error: 'cout' was not declared in this scope
   16 |                 cout << "NO";
      |                 ^~~~
a.cc:16:17: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:18:17: error: 'cout' was not declared in this scope
   18 |                 cout << "YES";
      |                 ^~~~
a.cc:18:17: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:20:17: error: 'cout' was not declared in this scope
   20 |                 cout << "NO";
      |                 ^~~~
a.cc:20:17: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

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

int main(){
    string c;
    for(int i = 1; i < 3; i++){
        for(int j = 1; j < 4; j++){
            cin >> c[i][j];
            if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
                cout << "Yes" << endl;
            }
            else cout << "No" << endl;
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   11 |             cin >> c[i][j];
      |                        ^
a.cc:12:20: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                    ^
a.cc:12:31: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                               ^
a.cc:12:42: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                          ^
a.cc:12:53: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                     ^
a.cc:12:64: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                                ^
a.cc:12:75: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                                           ^
Language: C++

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

int main(){
    int c;
    for(int i = 1; i < 3; i++){
        for(int j = 1; j < 4; j++){
            cin >> c[i][j];
            if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
                cout << "Yes" << endl;
            }
            else cout << "No" << endl;
        }
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:21: error: invalid types 'int[int]' for array subscript
   11 |             cin >> c[i][j];
      |                     ^
a.cc:12:17: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                 ^
a.cc:12:28: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                            ^
a.cc:12:39: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                       ^
a.cc:12:50: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                  ^
a.cc:12:61: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                             ^
a.cc:12:72: error: invalid types 'int[int]' for array subscript
   12 |             if(c[1][1] == c[2][3] && c[1][2] == c[2][2] && c[1][3] == c[2][1]){
      |                                                                        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
  char a,b,c,d,e,f;
  cin >> a >> b >> c >> d >> e >> f;
  if (a==f&&b=e&&c==d)
  cout << "YES" << endl;
  else
  cout << "NO" << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: lvalue required as left operand of assignment
    7 |   if (a==f&&b=e&&c==d)
      |       ~~~~^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
   string S[2];
   cin >> S[0];
   cin >> S[1];
  if(S[0][0]==S[1][2] && S[0][1]==S[1][1] && S[0][2]==S[1][0])
    cout << "YES"　<< endl;
  else
    cout << "NO" << endl;
  return 0;
}


Compiler output:
a.cc:8:13: error: extended character 　 is not valid in an identifier
    8 |     cout << "YES"　<< endl;
      |             ^
a.cc: In function 'int main()':
a.cc:8:13: error: unable to find string literal operator 'operator""\U00003000' with 'const char [4]', 'long unsigned int' arguments
    8 |     cout << "YES"　<< endl;
      |             ^~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
   string S[2];
   cin >> S[0];
   cin >> S[1];
  if(S[0][0]==S[1][2] && S[0][1]==S[1][1] && S[0][2]==S[1][0])
    cout << "YES"　<< endl;
  else
    cout << "NO" << endl;
  return 0;
}

Compiler output:
a.cc:8:13: error: extended character 　 is not valid in an identifier
    8 |     cout << "YES"　<< endl;
      |             ^
a.cc: In function 'int main()':
a.cc:8:13: error: unable to find string literal operator 'operator""\U00003000' with 'const char [4]', 'long unsigned int' arguments
    8 |     cout << "YES"　<< endl;
      |             ^~~~~~~
Language: C++

#include <stdio.h>
int main ( )
{
char a[ 1 0 ] , b[ 1 0 ] ;
scanf (”% s%s ” , a , 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:5:8: error: extended character ” is not valid in an identifier
    5 | scanf (”% s%s ” , a , b ) ;
      |        ^
a.cc:5:15: error: extended character ” is not valid in an identifier
    5 | scanf (”% s%s ” , a , b ) ;
      |               ^
a.cc:6:79: error: extended character ” is not valid in an identifier
    6 | if ( a [ 0 ] == b [ 2 ] && a [ 1 ] == b [ 1 ] && a [ 2 ] == b [ 0 ] ) printf( ”YES\n ” ) ;
      |                                                                               ^
a.cc:6:83: error: stray '\' in program
    6 | if ( a [ 0 ] == b [ 2 ] && a [ 1 ] == b [ 1 ] && a [ 2 ] == b [ 0 ] ) printf( ”YES\n ” ) ;
      |                                                                                   ^
a.cc:6:86: error: extended character ” is not valid in an identifier
    6 | if ( a [ 0 ] == b [ 2 ] && a [ 1 ] == b [ 1 ] && a [ 2 ] == b [ 0 ] ) printf( ”YES\n ” ) ;
      |                                                                                      ^
a.cc:7:14: error: extended character ” is not valid in an identifier
    7 | else printf( ”NO\n ” ) ;
      |              ^
a.cc:7:17: error: stray '\' in program
    7 | else printf( ”NO\n ” ) ;
      |                 ^
a.cc:7:20: error: extended character ” is not valid in an identifier
    7 | else printf( ”NO\n ” ) ;
      |                    ^
a.cc: In function 'int main()':
a.cc:4:10: error: expected ']' before numeric constant
    4 | char a[ 1 0 ] , b[ 1 0 ] ;
      |          ^~
      |          ]
a.cc:5:8: error: '\U0000201d' was not declared in this scope
    5 | scanf (”% s%s ” , a , b ) ;
      |        ^
a.cc:5:11: error: 's' was not declared in this scope
    5 | scanf (”% s%s ” , a , b ) ;
      |           ^
a.cc:5:19: error: 'a' was not declared in this scope
    5 | scanf (”% s%s ” , a , b ) ;
      |                   ^
a.cc:5:23: error: 'b' was not declared in this scope
    5 | scanf (”% s%s ” , a , b ) ;
      |                       ^
a.cc:6:79: error: '\U0000201dYES' was not declared in this scope
    6 | if ( a [ 0 ] == b [ 2 ] && a [ 1 ] == b [ 1 ] && a [ 2 ] == b [ 0 ] ) printf( ”YES\n ” ) ;
      |                                                                               ^~~~
a.cc:7:14: error: '\U0000201dNO' was not declared in this scope
    7 | else printf( ”NO\n ” ) ;
      |              ^~~
Language: C++

#include<bits/stdc++.h>
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define REP(i, n) for (int i = 0; i < (n); ++i)
#define int long long
using namespace std;
signed main(){
	string a,b;
	cin >> a >> b;
	(a[0] == b[2] && a[1] == b[1] && a[2] == b[0])?cout << "YES" : cout << "NO"
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:84: error: expected ';' before 'return'
    9 |         (a[0] == b[2] && a[1] == b[1] && a[2] == b[0])?cout << "YES" : cout << "NO"
      |                                                                                    ^
      |                                                                                    ;
   10 |     return 0;
      |     ~~~~~~
Language: C++

#include<iostream>
#include<string>
#include<vector>
#include<algorithm>
#include<iomanip>
using namespace std;
#define int long long
#define rep(i,n) for(int i = 0; i < n; i++)
#define INF (long long)(1e18)
#define MOD (int)(1e9+7)
#define MAX_N 103
#define MAX_V 10
#define MAX_M 101
#define yn(f) (f?"Yes":"No")
#define YN(f) (f?"YES":"NO")
#define pro "はいプロ　世界一○○が上手　○○界のtourist　○○時代の終焉を告げる者　実質○○　○○するために生まれてきた男"

signed main(){
	cout<<fixed<<setprecision(7);
	int n = 0, m = 0;
	int a = 0, b = 0, c = 0, d = 0, e = 0;
	bool f = true, flag = true;
	string S[0];
	cin>>S[0]>>S[1];
	rep(i,S.size()){
		if(S[0][i] != S[1][S.size()-i-1]) f = false;
	}
	//cin>>n;
	
	//for(int i = 0; i < n; i++){
	//}
	
	// cout<<yn(f)<<endl;
	cout<<YN(f)<<endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:17: error: request for member 'size' in 'S', which is of non-class type 'std::string [0]' {aka 'std::__cxx11::basic_string<char> [0]'}
   25 |         rep(i,S.size()){
      |                 ^~~~
a.cc:8:37: note: in definition of macro 'rep'
    8 | #define rep(i,n) for(int i = 0; i < n; i++)
      |                                     ^
a.cc:26:38: error: request for member 'size' in 'S', which is of non-class type 'std::string [0]' {aka 'std::__cxx11::basic_string<char> [0]'}
   26 |                 if(S[0][i] != S[1][S.size()-i-1]) f = false;
      |                                      ^~~~
Language: C++

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

using ll    = long long;
using ull   = unsigned long long;
using veci  = vector<int>;
using vecll = vector<ll>;
#define EPS (1e-7)
#define INF (1e9)
#define PI  (acos(-1))
#define FOR(i,a,b) for(int i = (a);i < (b); ++i)
#define REP(i,n) for(int i= 0;i<(int)(n);++i)
#define pb push_back

veci enum_div(int n){
	veci ret;
	ret.pb(1);
	for(int i=1;i*i<n;i++){
		if(n%i==0){
			ret.pb(i);
			if(i != n/i){ret.pb(n/i);}
		}
	}
	ret.pb(n);
	return ret;
}
int gcb(int a,int b){return ((b == 0)? a : gcb(b,a%b));}
int gcd(int a,int b){return (a*b) / gcb(a,b);}

int main(){
    string c1,c2;
    cin >> c1 >> c2;
    if(c1[0]!=c2[2] || c1[1]!=c2[1] || c1[2]!=c[0]){
        cout << "NO" << endl;
    }else{
        cout << "YES" << endl;
    }
    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:33:47: error: 'c' was not declared in this scope; did you mean 'c2'?
   33 |     if(c1[0]!=c2[2] || c1[1]!=c2[1] || c1[2]!=c[0]){
      |                                               ^
      |                                               c2
Language: C++

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

int main() {
    vector<char> C(6);
    for (int i = 0; i < 6; i++) {
        cin >> C[i];
    }

    if (C[0) == C[5] && C[1] == C[4] && C[2] == C[3]) {
        cout << "YES" << endl;
    }
    else {
        cout << "NO" << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: expected ']' before ')' token
   10 |     if (C[0) == C[5] && C[1] == C[4] && C[2] == C[3]) {
      |            ^
      |            ]
a.cc:10:14: error: expected primary-expression before '==' token
   10 |     if (C[0) == C[5] && C[1] == C[4] && C[2] == C[3]) {
      |              ^~
Language: C

#include <stdio..h>
int main(){
  char s[3],t[3];
  scanf("%s%s",s,t);
  puts((s[0]==t[2]&&s[1]==t[1]&&s[2]==t[0])?"YES":"NO");
}

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

#include<iostream>
#include<numeric>
#include<cmath>
#include<vector>
#include<string>

using namespace std;

int main() {
   string N;
 
 for(int i=0;i<2;i++){
    for(int j=0;j<3;j++){
        cin>>N;
    }
 }
    if(N[0][0]==N[1][2] && N[1][2]==N[0][0]){
    cout<<"Yes"<<endl;
    }else{
    cout<<"No"<<endl;
    }
    
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:12: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   17 |     if(N[0][0]==N[1][2] && N[1][2]==N[0][0]){
      |            ^
a.cc:17:21: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   17 |     if(N[0][0]==N[1][2] && N[1][2]==N[0][0]){
      |                     ^
a.cc:17:32: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   17 |     if(N[0][0]==N[1][2] && N[1][2]==N[0][0]){
      |                                ^
a.cc:17:41: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
   17 |     if(N[0][0]==N[1][2] && N[1][2]==N[0][0]){
      |                                         ^
Language: C++

#include<iostream>
 
using namespace std;
 
int main()
{
    char str1[3];
    char str2[3];
        
    cin >> str1;
    cin >> str2;
    
    if(str1[0]==str2[2]&&str[1]==str[1]&&str1[2]==str2[0]){
    cout <<  "YES" << endl;
    }else{
    	cout<< "NO" <<endl;
    }
       return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:26: error: 'str' was not declared in this scope; did you mean 'str2'?
   13 |     if(str1[0]==str2[2]&&str[1]==str[1]&&str1[2]==str2[0]){
      |                          ^~~
      |                          str2
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main(){
  char a,b;
  for(int i=0;i<3;i++){
    cin>>a[i]>>endl;
  }
  for(int i=0;i<3;i++){
    cin>>b[i]>>endl;
  }
  if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
    cout<<"YES"<<endl;
  else cout<<"NO"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: invalid types 'char[int]' for array subscript
    7 |     cin>>a[i]>>endl;
      |           ^
a.cc:10:11: error: invalid types 'char[int]' for array subscript
   10 |     cin>>b[i]>>endl;
      |           ^
a.cc:12:7: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |       ^
a.cc:12:13: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |             ^
a.cc:12:19: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |                   ^
a.cc:12:25: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |                         ^
a.cc:12:31: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |                               ^
a.cc:12:37: error: invalid types 'char[int]' for array subscript
   12 |   if(a[0]==b[2]&&a[1]==b[1]&&a[2]==b[0])
      |                                     ^
Language: C++

#include <iostream>
#include <vector>

int main() {
    std::string C1, C2;
    std::cin >> C1;
    std::cin >> C2;

    std::reverse(C2.begin(), C2.end());
    std::cout << (C1 == C2 ? "YES" : "NO") << std::endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: 'reverse' is not a member of 'std'
    9 |     std::reverse(C2.begin(), C2.end());
      |          ^~~~~~~
Language: C++

#include <iostream>
#include <vector>
#include "../cxx-prettyprint/prettyprint.hpp"

int main() {
    std::string C1, C2;
    std::cin >> C1;
    std::cin >> C2;

    std::reverse(C2.begin(), C2.end());
    std::cout << (C1 == C2 ? "YES" : "NO") << std::endl;
}


Compiler output:
a.cc:3:10: fatal error: ../cxx-prettyprint/prettyprint.hpp: No such file or directory
    3 | #include "../cxx-prettyprint/prettyprint.hpp"
      |          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string s1,s2;
  cin>>s1>>s2;
	if(s1[0]==s2[2] and s1[1]==s2[1] and s1[2]==s2[0]) cout<<"YES<<endl;
      else cout<<"NO"<<endl;
  return 0;
}


Compiler output:
a.cc:6:66: warning: missing terminating " character
    6 |         if(s1[0]==s2[2] and s1[1]==s2[1] and s1[2]==s2[0]) cout<<"YES<<endl;
      |                                                                  ^
a.cc:6:66: error: missing terminating " character
    6 |         if(s1[0]==s2[2] and s1[1]==s2[1] and s1[2]==s2[0]) cout<<"YES<<endl;
      |                                                                  ^~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:7:7: error: expected primary-expression before 'else'
    7 |       else cout<<"NO"<<endl;
      |       ^~~~
Language: C++

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

int main(){
  char C[2][3];
  for(int  i=0;i<2;i++){
    string S;
    cin>>S;
    for(int j=0;j<3;j++){
      C[i][j]=S[j];     
    }
  }
  int cnt=0;
  for(int i=0;i<3;i++){
    cnt+=C[0][j]==C[1][2-j];
  }
  if(cnt==3) cout<<"YES"<<endl;
  else cout<<"NO"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:15: error: 'j' was not declared in this scope
   16 |     cnt+=C[0][j]==C[1][2-j];
      |               ^
Language: C++

#include <stdio.h>

int main(){
    char a[5];
    char b[5];
    scanf( "%s", &a);
    scanf( "%s", &b);

    bool ok = a[0] == b[2] && ok = a[1] == b[1] && ok = a[2] == b[0];

    if(ok)
        printf( "Yes\n");
    else
        printf( "No\n");


    return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:49: error: lvalue required as left operand of assignment
    9 |     bool ok = a[0] == b[2] && ok = a[1] == b[1] && ok = a[2] == b[0];
      |                                    ~~~~~~~~~~~~~^~~~~
Language: C++

#include <iostream>
using namespace std;

int main() {
  int N;
  cin >> N;
  int a=sqrt(N);
  cout << a*a << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'sqrt' was not declared in this scope
    7 |   int a=sqrt(N);
      |         ^~~~