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

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

int f(int x) {
  int k = 0;
  while (x >= 1) {
    k++;
    x /= 10;
  }
  int y = 0;
  while (x >= 10) {
    if (x/pow(10,k) == x%10) {
      x = (x%pow(10,k) - x%10) /10;
    } else {
      y = 1;
      break;
    }
  }
  return y;
}

int main() {
  int A, B;
  cin >> A >> B;
  int count = 0;
  for (int i = A; i <= B; i++) {
    if (f(i) == 1) count++;
  }
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int f(int)':
a.cc:14:13: error: invalid operands of types 'int' and '__gnu_cxx::__promote<double>::__type' {aka 'double'} to binary 'operator%'
   14 |       x = (x%pow(10,k) - x%10) /10;
      |            ~^~~~~~~~~~
      |            |    |
      |            int  __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

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

int main() {
  int a, b, sum, count;
  
  cin >> a >> b;
  
  //a→bのループ開始
  for (int i = a; i < b; i++){
    sum = 0;
    int x = i;
    int k = i;
    int l = 0;
    //回文数の探索
    for(int j = 5; j >= 0; j--){
      l=5-j;
      int y = std::pow(10,j);//yは10^5〜10^0まで
      int z = k/y ;//kの最大桁の数を導出
      
      k = k%y;//kから最大桁を除外
      int n = k * std::pow(10,l);
      sum += n ;　//kに10^0~10^5までかけたい
      
    }
    //sumとiを比較して一致したらcountに＋1する
    if(sum == i){
     count ++ ; 
    }
    
  }
    cout << count << endl;

}


Compiler output:
a.cc:23:17: error: extended character 　 is not valid in an identifier
   23 |       sum += n ;　//kに10^0~10^5までかけたい
      |                 ^
a.cc: In function 'int main()':
a.cc:23:17: error: '\U00003000' was not declared in this scope
   23 |       sum += n ;　//kに10^0~10^5までかけたい
      |                 ^~
Language: C++

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

int main() {
  int a, b, sum, count;
  
  cin >> a >> b;
  
  //a→bのループ開始
  for (int i = a; i < b; i++){
    sum = 0;
    int x = i;
    int k = i;
    int l = 0;
    //回文数の探索
    for(int j = 5; j >= 0; j--){
      l=5-j;
      int y = std::pow(10,j);//yは10^5〜10^0まで
      int z = k/y ;//kの最大桁の数を導出
      
      k = k%y;//kから最大桁を除外
      sum = sum + k * std::pow(10,l);　//kに10^0~10^5までかけたい
      
    }
    //sumとiを比較して一致したらcountに＋1する
    if(sum == i){
     count ++ ; 
    }
    
  }
    cout << count << endl;

}


Compiler output:
a.cc:22:38: error: extended character 　 is not valid in an identifier
   22 |       sum = sum + k * std::pow(10,l);　//kに10^0~10^5までかけたい
      |                                      ^
a.cc: In function 'int main()':
a.cc:22:38: error: '\U00003000' was not declared in this scope
   22 |       sum = sum + k * std::pow(10,l);　//kに10^0~10^5までかけたい
      |                                      ^~
Language: C++

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

int main() {
  int a, b, sum, count;
  
  cin >> a >> b;
  
  //a→bのループ開始
  for (int i = a; i < b; i++){
    sum = 0;
    int x = i;
    int k = i;
    int l = 0;
    //回文数の探索
    for(int j = 5; j >= 0; j--){
      l=5-j;
      int y = std::pow(10,j);//yは10^5〜10^0まで
      int z = k/y ;//kの最大桁の数を導出
      
      k = k%y;//kから最大桁を除外
      
      sum += k * std::pow(10,l);　//kに10^0~10^5までかけたい
      
    }
    //sumとiを比較して一致したらcountに＋1する
    if(sum == i){
     count ++ ; 
    }
    
  }
    cout << count << endl;

}

Compiler output:
a.cc:23:33: error: extended character 　 is not valid in an identifier
   23 |       sum += k * std::pow(10,l);　//kに10^0~10^5までかけたい
      |                                 ^
a.cc: In function 'int main()':
a.cc:23:33: error: '\U00003000' was not declared in this scope
   23 |       sum += k * std::pow(10,l);　//kに10^0~10^5までかけたい
      |                                 ^~
Language: C++

//090 2018/03/11
#include <bits/stdc++.h>
using namespace std;

int main(){
	int a , b ; cin >> a >> b;
	int cnt=0;
	for(int i=a;i<=b;++i){
		int p=i/pow(10,4); int q=i%10;
		int x=i/pow(10,3)%10; int y=i/10%10;
		if( p==q && x==y ) ++cnt;
	}
	cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:34: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   10 |                 int x=i/pow(10,3)%10; int y=i/10%10;
      |                       ~~~~~~~~~~~^~~
      |                        |          |
      |                        |          int
      |                        __gnu_cxx::__promote<double>::__type {aka double}
Language: C++

//090 2018/03/11
#include <bits/stdc++.h>
using namespace std;

int main(){
	int a , b ; cin >> a >> b;
	int cnt=0;
	for(int i=a;i<=b;++i){
		int p=i/pow(10,4), q=i%10;
		int x=i/pow(10,3)%10 , y=i/10%10;
		if( p==q && x==y ) ++cnt;
	}
	cout << cnt << endl;
}

	 


Compiler output:
a.cc: In function 'int main()':
a.cc:10:34: error: invalid operands of types '__gnu_cxx::__promote<double>::__type' {aka 'double'} and 'int' to binary 'operator%'
   10 |                 int x=i/pow(10,3)%10 , y=i/10%10;
      |                       ~~~~~~~~~~~^~~
      |                        |          |
      |                        |          int
      |                        __gnu_cxx::__promote<double>::__type {aka double}
a.cc:11:32: error: 'y' was not declared in this scope
   11 |                 if( p==q && x==y ) ++cnt;
      |                                ^
Language: C++

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

int cnt_digit(int x){
	int cnt=0;
	while(1){
		++cnt;
		if(x%10==0) break;
		x/=10;
	}
	return cnt;
}

int main(){
	int a , b;
	cin >> a >> b;
	int tmp;int cnt=0;bool f=true;
	for(int i=a;i<=b;++i){
		tmp=i; int d=cnt_digit(i);
		for(int j=d;j>d/2;--j){
			if(i/pow(10,d-1)==i%10) i/=10;
			else f=false;
		}
		i=tmp;++cnt;
	}
	cout << (f ? "Yes" : "No") << endl:
}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:43: error: expected ';' before ':' token
   26 |         cout << (f ? "Yes" : "No") << endl:
      |                                           ^
      |                                           ;
Language: C++

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

int cnt_digit(int x){
	int cnt=0;
	while(1){
		++cnt;
		if(x%10==0) break;
		x/=10;
	}
	return cnt;
}

int main(){
	int a , b;
	cin >> a >> b;
	int tmp;int cnt=0;bool f=true;
	for(int i=a;i<=b;++i,--j){
		tmp=i; int d=cnt_digit(i);
		for(int j=d;j>d/2;--j){
			if(i/pow(10,d-1)==i%10) i/=10;
			else f=false;
		}
		i=tmp;++cnt;
	}
	cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:32: error: 'j' was not declared in this scope
   18 |         for(int i=a;i<=b;++i,--j){
      |                                ^
Language: C++

#include <iostream>
#include <string>

using namespace std;

int main(){

 int A,B;
 cin >> A >> B;
 string x;
 int m = 0;
 if(int i = A;i < B;i++){
   if(x[0] == x[4] && x[1] == x[3])
   m++;
 }

cout << m;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:20: error: expected ')' before ';' token
   12 |  if(int i = A;i < B;i++){
      |    ~               ^
      |                    )
a.cc:12:21: error: 'i' was not declared in this scope
   12 |  if(int i = A;i < B;i++){
      |                     ^
Language: C++

#include<stdio.h>
int main()
{
  int a, b:
  scanf("%d%d",&a, &b);
        int r = 0;
        for (int i =a; i<=b; i++)
        {
          int s = i%10, t=i/1000%10;
          int u =i/10%10, v=i/1000%10;
          if(s==t&&u==v)r++;
        }
        printf("%d\n", r);
        }
          


Compiler output:
a.cc: In function 'int main()':
a.cc:4:11: error: found ':' in nested-name-specifier, expected '::'
    4 |   int a, b:
      |           ^
      |           ::
a.cc:4:10: error: 'b' has not been declared
    4 |   int a, b:
      |          ^
a.cc:5:8: error: qualified-id in declaration before '(' token
    5 |   scanf("%d%d",&a, &b);
      |        ^
a.cc:7:27: error: 'b' was not declared in this scope
    7 |         for (int i =a; i<=b; i++)
      |                           ^
Language: C++

#include<stdio.h>
int main()
{
  int a, b:
  scanf("%d%d,&a, &b);
        int r = 0;
        for (int i =a; i<=b; i++)
        {
          int s = i%10, t=i/1000%10;
          int u =i/10%10, v=i/1000%10;
          if(s==t&&u==v)r++;
        }
        printf("%d\n",r);
        }
          

Compiler output:
a.cc:5:9: warning: missing terminating " character
    5 |   scanf("%d%d,&a, &b);
      |         ^
a.cc:5:9: error: missing terminating " character
    5 |   scanf("%d%d,&a, &b);
      |         ^~~~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:11: error: found ':' in nested-name-specifier, expected '::'
    4 |   int a, b:
      |           ^
      |           ::
a.cc:4:10: error: 'b' has not been declared
    4 |   int a, b:
      |          ^
a.cc:5:8: error: qualified-id in declaration before '(' token
    5 |   scanf("%d%d,&a, &b);
      |        ^
a.cc:7:27: error: 'b' was not declared in this scope
    7 |         for (int i =a; i<=b; i++)
      |                           ^
a.cc:11:25: error: 'r' was not declared in this scope
   11 |           if(s==t&&u==v)r++;
      |                         ^
a.cc:13:23: error: 'r' was not declared in this scope
   13 |         printf("%d\n",r);
      |                       ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int A, B;
  cin >> A >> B;
  int total = 0;
  for (i = A; i <= B; i++){
    if ((i / 10000 == i % 10)){
      if ((i % 10000)/1000 == (i % 100)/10){
        total += 1;
      }
    }
  }
  cout << total << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:8: error: 'i' was not declared in this scope
    8 |   for (i = A; i <= B; i++){
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int N, K,sum=0,a;
  cin >> N>>K;
  a=N
  for(int i=0;i< K-N +1;i++){
    
    if(a/10000 == a%10 && a%10000/1000 == a%100/10){
      sum++;
    }
    a++;
  }
  cout << sum << endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: expected ';' before 'for'
    7 |   a=N
      |      ^
      |      ;
    8 |   for(int i=0;i< K-N +1;i++){
      |   ~~~ 
a.cc:8:15: error: 'i' was not declared in this scope
    8 |   for(int i=0;i< K-N +1;i++){
      |               ^
Language: C++

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

int keta(int n){
  int i, j, l, m;
  m = n%10;
  n /= 10;
  l = n%10;
  n /= 100;
  j = n%10;
  n /= 10;
  i = n%10;
  return i, j, l, m;
}
int main(){
  int A, B;
  cin >> A >> B;
  int count = 0;
  for(int n = A; i <= B; i++){
    int i, j, k, l;
    i, j, k, l = keta(n);
    if(i == l && j == k) count++;
  }
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:18: error: 'i' was not declared in this scope
   19 |   for(int n = A; i <= B; i++){
      |                  ^
Language: C++

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

int keta(int n){
  int i, j, l, m;
  m = n%10;
  n /= 10;
  l = n%10;
  n /= 100;
  j = n%10;
  n /= 10;
  i = n%10;
  return i, j, l, m;
}
int main(){
  int A, B;
  cin >> A >> B;
  int count = 0;
  for(int n = A; i <= B; i++){
    i, j, k, l = keta(n);
    if(i == l && j == k) count++;
  }
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:18: error: 'i' was not declared in this scope
   19 |   for(int n = A; i <= B; i++){
      |                  ^
a.cc:20:8: error: 'j' was not declared in this scope
   20 |     i, j, k, l = keta(n);
      |        ^
a.cc:20:11: error: 'k' was not declared in this scope
   20 |     i, j, k, l = keta(n);
      |           ^
a.cc:20:14: error: 'l' was not declared in this scope
   20 |     i, j, k, l = keta(n);
      |              ^
Language: C++

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

int keta(int n){
  int i, j, l, m;
  m = n%10;
  n /= 10;
  l = n%10;
  n /= 100;
  j = n%10;
  n /= 10;
  i = n%10;
  return i, j, l, m;
}
int main(){
  int A, B;
  cin >> A >> B;
  int count = 0;
  for(int n = A; i <= B; i++){
    i, j, k, l = keta(n);
    if(i == l && j == k) count++;
  }
  cout << count << endl;
}

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

#include<bits/stdc++.h>
using namespace std;
int main(void){
  
  int i,a,b,s1,s2,s4,s5nr=0;
  
  cin>>a>>b;
  for(i=a;i<=b;i++){
    s1 = i/10000;
    s2 = i/1000%10;
    s4 = i/10%10;
    s5 = i%10;
	if(s1==s5 && s2==s4)nr++;
  }
  cout<<nr;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:5: error: 's5' was not declared in this scope; did you mean 's4'?
   12 |     s5 = i%10;
      |     ^~
      |     s4
a.cc:13:29: error: 'nr' was not declared in this scope; did you mean 's5nr'?
   13 |         if(s1==s5 && s2==s4)nr++;
      |                             ^~
      |                             s5nr
a.cc:15:9: error: 'nr' was not declared in this scope; did you mean 's5nr'?
   15 |   cout<<nr;
      |         ^~
      |         s5nr
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  
	int A, B;
	cin >> A >> B;
  int count=0;
  for (int i=A; i<B+1; i++){
  if ((i-10000*(i/10000))/1000 == ((i-i%10)/10)%10 && i/10000 == i %10)
    //kaibun teki nara count++ suru
    count++
  }
  }
	cout << count<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:12: error: expected ';' before '}' token
   12 |     count++
      |            ^
      |            ;
   13 |   }
      |   ~         
a.cc: At global scope:
a.cc:15:9: error: 'cout' does not name a type
   15 |         cout << count<< endl;
      |         ^~~~
a.cc:16:1: error: expected declaration before '}' token
   16 | }
      | ^
Language: Java

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

int main() {
int a,b;
cin >> a >> b;
int count=0;
for(int i=a;i<=b;i++){
string s=to_string(i);
int flag=0;
for(int j=0;j<(int)(s.length())/2;j++){
if(s[j]!=s[(int)(s.length())-1-j])flag=1;

}
if(flag==0)count++;
flag=0;
}
cout << count;
}

Compiler output:
Main.java:1: error: illegal character: '#'
#include <bits/stdc++.h>
^
Main.java:1: error: class, interface, enum, or record expected
#include <bits/stdc++.h>
         ^
Main.java:6: error: not a statement
cin >> a >> b;
         ^
Main.java:18: error: not a statement
cout << count;
     ^
Main.java:4: error: unnamed classes are a preview feature and are disabled by default.
int main() {
^
  (use --enable-preview to enable unnamed classes)
5 errors
Language: Java

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <string>
#include <sstream>
#include <complex>
#include <vector>
#include <list>
#include <queue>
#include <deque>
#include <stack>
#include <map>
#include <set>
typedef long long unsigned int ll;

#define EPS (1e-7)
#define INF (1e9)
#define PI (acos(-1))

using namespace std;
using Graph = vector<vector<int>>;

int main() {
int a,b;
cin >> a >> b;
int count=0;
for(int i=a;i<=b;i++){
string s=to_string(i);
int flag=0;
for(int j=0;j<(int)(s.length())/2;j++){
if(s[j]!=s[(int)(s.length())-1-j])flag=1;

}
if(flag==0)count++;
flag=0;
}
cout << count;
}

Compiler output:
Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:2: error: illegal character: '#'
#include <cstdio>
^
Main.java:3: error: illegal character: '#'
#include <cstdlib>
^
Main.java:4: error: illegal character: '#'
#include <cstring>
^
Main.java:5: error: illegal character: '#'
#include <algorithm>
^
Main.java:6: error: illegal character: '#'
#include <string>
^
Main.java:7: error: illegal character: '#'
#include <sstream>
^
Main.java:8: error: illegal character: '#'
#include <complex>
^
Main.java:9: error: illegal character: '#'
#include <vector>
^
Main.java:10: error: illegal character: '#'
#include <list>
^
Main.java:11: error: illegal character: '#'
#include <queue>
^
Main.java:12: error: illegal character: '#'
#include <deque>
^
Main.java:13: error: illegal character: '#'
#include <stack>
^
Main.java:14: error: illegal character: '#'
#include <map>
^
Main.java:15: error: illegal character: '#'
#include <set>
^
Main.java:18: error: illegal character: '#'
#define EPS (1e-7)
^
Main.java:18: error: class, interface, enum, or record expected
#define EPS (1e-7)
        ^
Main.java:19: error: illegal character: '#'
#define INF (1e9)
^
Main.java:20: error: illegal character: '#'
#define PI (acos(-1))
^
Main.java:23: error: unnamed classes are a preview feature and are disabled by default.
using Graph = vector<vector<int>>;
^
  (use --enable-preview to enable unnamed classes)
Main.java:23: error: '.class' expected
using Graph = vector<vector<int>>;
                               ^
Main.java:23: error: illegal start of expression
using Graph = vector<vector<int>>;
                                 ^
Main.java:27: error: not a statement
cin >> a >> b;
         ^
Main.java:39: error: not a statement
cout << count;
     ^
24 errors
Language: C++

#include<iostream>
using namespace std;

int main () {
  
  int A,B;
  cin >> A >> B;
  int answer = 0;
  
  for(int i = A; i<=B; i++){
    vector<int>vec = i;
    if(i == reverse(vec.begin(),vec.end()){
      answer++;
    }
  }
  
  cout << answer << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:5: error: 'vector' was not declared in this scope
   11 |     vector<int>vec = i;
      |     ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include<iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:11:12: error: expected primary-expression before 'int'
   11 |     vector<int>vec = i;
      |            ^~~
a.cc:12:21: error: 'vec' was not declared in this scope
   12 |     if(i == reverse(vec.begin(),vec.end()){
      |                     ^~~
a.cc:12:13: error: 'reverse' was not declared in this scope
   12 |     if(i == reverse(vec.begin(),vec.end()){
      |             ^~~~~~~
a.cc:12:43: error: expected ')' before '{' token
   12 |     if(i == reverse(vec.begin(),vec.end()){
      |       ~                                   ^
      |                                           )
a.cc:15:3: error: expected primary-expression before '}' token
   15 |   }
      |   ^
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  
  int a,b,c,d,temp,counter=0;
  
  for(int i = A; i<B+1; i++{
    a = i/10000;
    temp = i%10000;
    b = temp / 1000;
    temp %= 1000;
    temp %= 100;
    c = temp / 10;
    d = temp % 10;
    if(a==d && b==c)
      counter++;
  }

  cout << counter<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:28: error: expected ')' before '{' token
   10 |   for(int i = A; i<B+1; i++{
      |      ~                     ^
      |                            )
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  
  int a,b,c,d,temp,counter=0;
  
  for(int i = A; i<B+1; i++{
    temp = 0
    a = i/10000;
    temp = i%10000;
    b = temp / 1000;
    temp %= 1000;
    temp %= 100;
    c = temp / 10;
    d = temp % 10;
    if(a==d && b==c)
      counter++;
  }

  cout << counter<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:28: error: expected ')' before '{' token
   10 |   for(int i = A; i<B+1; i++{
      |      ~                     ^
      |                            )
a.cc:11:13: error: expected ';' before 'a'
   11 |     temp = 0
      |             ^
      |             ;
   12 |     a = i/10000;
      |     ~
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  
  int a,b,c,d,counter=0;
  
  for(int i = A; i<B+1; i++{
    temp = 0
    a = i/10000;
    temp = i%10000;
    b = temp / 1000;
    temp %= 1000;
    temp %= 100;
    c = temp / 10;
    d = temp % 10;
    if(a==d && b==c)
      counter++;
  }

  cout << counter<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:28: error: expected ')' before '{' token
   10 |   for(int i = A; i<B+1; i++{
      |      ~                     ^
      |                            )
a.cc:11:5: error: 'temp' was not declared in this scope; did you mean 'tm'?
   11 |     temp = 0
      |     ^~~~
      |     tm
Language: C++

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

int main() {
  int a, b;
  cin >> a >> b;
  
  int sum;
  for(int n = a; n <= b; n++) {
    int temp_n = n;
    int rev_temp_n = 0;
    while(temp_n > 0) {
      rev_n += temp_n % 10;
      rev_n *= 10;
      temp_n /= 10;
    }
    if(rev_n == n)
      sum++;
  }
  
  cout << sum << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:7: error: 'rev_n' was not declared in this scope
   13 |       rev_n += temp_n % 10;
      |       ^~~~~
a.cc:17:8: error: 'rev_n' was not declared in this scope
   17 |     if(rev_n == n)
      |        ^~~~~
Language: C++

 #include <bits/stdc++.h>
using namespace std;
 
int main() {
  int A;
  int B;
  cin >> A;
  cin >> B;
  int X=0;
  for ( int i = A ; i <= B ; i++ ) {
    string s=to_string(i);
    if(a[0]==a[4]&&a[1]==a[3])X++;
  }
  cout << X << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:8: error: 'a' was not declared in this scope
   12 |     if(a[0]==a[4]&&a[1]==a[3])X++;
      |        ^
Language: C++

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

int main() {
  int a, b;
  cin >> a >> b;
  
  int sum;
  for(int n = a; a <= b; n++) {
    int is_palind = 1;
    
    // 制約があるからいらない
    int digit_num;
    for(int i = n; i > 0; i /= 10)
      digit_num += 1;
    
    int temp_n = n;
    for(int i = digit_num; i > digit_num / 2; i--) {
      if(temp_n / pow(10.0, i - 1) != temp_n % 10) {
        is_palind = 0;
        break;
      }
      temp_n /= 10;
      temp_n -= ((n/pow(10.0, i-1)) * pow(10.0, i-1)) 
    }
    if(is_palind)
      sum++;
  }
  
  cout << sum << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:54: error: expected ';' before '}' token
   24 |       temp_n -= ((n/pow(10.0, i-1)) * pow(10.0, i-1))
      |                                                      ^
      |                                                      ;
   25 |     }
      |     ~
Language: C++

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

int main()
{
  int A, B, res = 0;
  cin >> A >> B;
  for(int i = A; i < B + 1; i++)
  {
    if(i % 10 - i % 100000 == 0 && i % 100 - i % 10000 == 0)
      res++
  }
  cout << res << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: expected ';' before '}' token
   11 |       res++
      |            ^
      |            ;
   12 |   }
      |   ~
Language: C++

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

int main()
{
  int A, B;
  cin >> A >> B;
  int res = 0;
  for(i = A; i < B + 1; i++)
  {
    if((i % 10 - i % 100000 == 0) && (i % 100 - i % 10000 == 0))
      res++
  }
  cout << res << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:7: error: 'i' was not declared in this scope
    9 |   for(i = A; i < B + 1; i++)
      |       ^
a.cc:12:12: error: expected ';' before '}' token
   12 |       res++
      |            ^
      |            ;
   13 |   }
      |   ~
Language: C++

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

int main()
{
  int A, B, res = 0;
  cin >> A >> B;
  for(i = A; i < B + 1; i++)
  {
    if(i % 10 - i % 100000 == 0 && i % 100 - i % 10000 == 0)
      res++
  }
  cout << res << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: 'i' was not declared in this scope
    8 |   for(i = A; i < B + 1; i++)
      |       ^
a.cc:11:12: error: expected ';' before '}' token
   11 |       res++
      |            ^
      |            ;
   12 |   }
      |   ~
Language: C++

#include<bits/stdc.h>
using namespace std;
int main(){
  int a,b;
  cin >> a >> b;
  int c,d,e;
  c = (b/100)-(a/100)-2;
  if((a/1000) == (a%100))
    d = 1;
  if((b/1000) == (b%100))
    e = 1;
  cout << c+d+e << endl;
}

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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  cin >> A, B;
  for(int i=A; i<=B; i++){
    int n1,n2,n3,n4,n5,c=0;
    n5=i/10000;
    n4=i/1000-n5*10;
    n3=i/100-n5*100-n4*10;
    n2=i/10-n5*1000-n4*100-n3*10;
    n1=i-n5*10000-n4*1000-n3*100-n2*10;
    if(n1==n5){
      if(n2==n4){
        c++;
      }
    }
  }
  cout << c << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:10: error: 'A' was not declared in this scope
    5 |   cin >> A, B;
      |          ^
a.cc:5:13: error: 'B' was not declared in this scope
    5 |   cin >> A, B;
      |             ^
a.cc:19:11: error: 'c' was not declared in this scope
   19 |   cout << c << endl;
      |           ^
Language: C++

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

int main(){
  int A, B, i = 0;
  cin >> A >> B;
  while (A <= B)
  {
    if(A % 10 == A / 10000 )
      if((A / 10) % 10 == (A /1000) % 10)
        i++;
      else
    else
    A++;
  }
  cout << i << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: expected primary-expression before 'else'
   13 |     else
      |     ^~~~
Language: C++

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

int main(){
  int A, B, i = 0;
  cin >> A >> B;
  while (A <= B)
  {
    if(A % 10 == A / 10000 )
      if((A / 10) % 10 == (A /1000) % 10)
        i++;
      else
    else
    A++
  }
  cout << i << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:5: error: expected primary-expression before 'else'
   13 |     else
      |     ^~~~
Language: C++

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

int main() {
  int a, b, r = 0;
  cin >> a >> b;
  rep(i, b-a+1){
    string s = tostring(a+i);
    if(s[0] == s[4] && s[1] == s[3]) ++r;
  }
  cout << r << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: 'tostring' was not declared in this scope
   10 |     string s = tostring(a+i);
      |                ^~~~~~~~
Language: Java

import java.util.*;

 
public class Main90B{
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    int A1 = 0;
    int A2 = 0;
    int A4 = 0;
    int A5 = 0;
    int sum =0;
    for(int i = A ; i < B; i++){
        A1 = (i / 10000) % 10;
        A2 = (i / 1000) % 10;
        A4 = (i /10) % 10;
        A5 = i % 10; 
        if(A1 == A5 && A2 == A4){
            sum = sum +1;
        }
    }
        System.out.println(sum); 
    }
}    


Compiler output:
Main.java:4: error: class Main90B is public, should be declared in a file named Main90B.java
public class Main90B{
       ^
1 error
Language: C++

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

int main() {
  int a, b;
  cin >> a >> b;
  int cnt = 0;
  for (int i = a; i <= b; i++) {
    if ( (i / 10000) == (i % 10) && ((i / 1000) % 10) == ((i / 100) % 10) ) {
      cnt ++;
    }
  cout << cnt << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:2: error: expected '}' at end of input
   14 | }
      |  ^
a.cc:5:12: note: to match this '{'
    5 | int main() {
      |            ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
int A,B,n;
cin>>A>>B;
for(int i=;i<=B;i++){
if(i/10000==i%10 && i/1000%10==i/10%10)
n++;
}
cout<<n<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: expected primary-expression before ';' token
    6 | for(int i=;i<=B;i++){
      |           ^
Language: C++

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

int main() {
  int A, B, n;
  cin >> A >> B;
  
  for(int i=A, i<=B, i++){
    if(i/10000%10==1%10 && i/1000%10==i/10%10)
      n++;
  }
    cout << n << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: expected ';' before '<=' token
    8 |   for(int i=A, i<=B, i++){
      |                 ^~
      |                 ;
a.cc:8:17: error: expected primary-expression before '<=' token
    8 |   for(int i=A, i<=B, i++){
      |                 ^~
a.cc:8:25: error: expected ';' before ')' token
    8 |   for(int i=A, i<=B, i++){
      |                         ^
      |                         ;
Language: C++

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


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

    int count = 0;
    for (int i = A; i <= B; i++) {
        string str = to_string(i);
        string reStr = to_string(i);
        reverse(reStr.begin(), reStr.end());
        if (str == reStr) {
            count++;
        }
    }
    
    cout << count << endl;
    
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'reverse' was not declared in this scope
   15 |         reverse(reStr.begin(), reStr.end());
      |         ^~~~~~~
Language: C++

#include <string>
#include <stdio.h>

using namespace std;

int main() {
    int a,b;
    cin >> a >> b;
    int count = 0;
    for(int i = a; i <= b; i++) {
        if(i / 1000 == i % 100) {
            count++;
        }
    }
    cout << count;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'cin' was not declared in this scope
    8 |     cin >> a >> b;
      |     ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include <string>
  +++ |+#include <iostream>
    2 | #include <stdio.h>
a.cc:15:5: error: 'cout' was not declared in this scope
   15 |     cout << count;
      |     ^~~~
a.cc:15:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
	int A;
	int B;
	int s,t,u,v;	
	int answer = 0;

	cin >> A >> B;

	for (int i = A; i <= B; i++) {
	
		s = i % 10;
		t = i / 10000 % 10;

		u = i / 10 % 10;
		v = i / 1000 % 10;

		if ( s = t && u = v ) 
			answer++;
	}
	
	cout << answer << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:28: error: lvalue required as left operand of assignment
   21 |                 if ( s = t && u = v )
      |                          ~~^~~~
Language: C++

#include <bits/stdc++.h>
#include <string>

int main() {
  int a, b;
  std::cin >> a >> b;
  
  string s;
  int count = 0;
  for(int i=a; i<=b; i++) {
    s = std::to_string(i);
    if(s == std::reverse(s.begin(), s.end()))
      count++;
  }
  std::cout << count;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: 'string' was not declared in this scope
    8 |   string s;
      |   ^~~~~~
a.cc:8:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 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/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:11:5: error: 's' was not declared in this scope
   11 |     s = std::to_string(i);
      |     ^
Language: C++

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

int main() {

	int A,B,cnt=0;
	cin>>A>>B;
  for(int i=A;i<=B;i++){
    if(to_string(i).at(0)==to_string(i).at(4) &&to_string(i).at(1)==to_string(i).at(3))cnt++;
  }
	cout<cnt<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   11 |         cout<cnt<<endl;
      |              ~~~^~~~~~
Language: C++

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

bool f(int i){
  bool y=false;
  int t=0,k=10000;
  for(int j=0;j<5;j++){
    t += (i%10)*k;
    i /= 10;
    k /= 10;
  }
  if(s == t) y = true;
  
  return y;
}

int main(){
  int a,b,ans=0;
  cin >> a >> b;
  for(int i=a;i<=b;i++){
    if(f(i)) ans++;
  }
  cout << ans << endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'bool f(int)':
a.cc:14:6: error: 's' was not declared in this scope
   14 |   if(s == t) y = true;
      |      ^
Language: C++

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

bool f(int i=0){
  bool y=false;
  string s = i;
  string t;
  for(int j=0;j<5;j++){
    t.at(j) = s.at(4-j);
  }
  if(s == t) y = true;
  
  return y;
}

int main(){
  int a,b,ans=0;
  cin >> a >> b;
  for(int i=a;i<=b;i++){
    if(f(i)) ans++;
  }
  cout << ans << endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'bool f(int)':
a.cc:8:14: error: conversion from 'int' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    8 |   string s = i;
      |              ^
Language: C++

#include<bits/stdc.h>
using namespace std;
int main(){
  int A,B,num;
  cin>>A>>B;
  for(int i=A;i<=B;i++){
  	if(i%10==i/10000%10 && i/100%10==i/1000%10) num++;
  }
  cout<<num<<endl;
}

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

#include<bits/stdc++.h>
using namespace std;
int main(){
  int A,B,num=0;
  cin>>A>>B;
  for(i=A;i<B;i++){
    int digit=log10(i);
    int tmp=i;
    int a[digit];
    for(int j=0;j<digit;j++){
      a[i]=tmp%10;
      tmp/=10;
    }
    for(int j=0;j<digit/2;j++){
      if(a[j]=a[digit-j]){
        num++;
        break;
      }
  }
  cout<<num<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:7: error: 'i' was not declared in this scope
    6 |   for(i=A;i<B;i++){
      |       ^
a.cc:21:2: error: expected '}' at end of input
   21 | }
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include <stdio.h>
#include <string>
int a,b,t;
int main(){
	scanf("%d%d",&a,&b);
	for(int i=a;i<=b;i++){
		if(to_string(i).substr(0,2)==to_string(i).substr(2,4)){t++;}
	}
			printf("%d\n",t);

}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: 'to_string' was not declared in this scope; did you mean 'std::__cxx11::to_string'?
    7 |                 if(to_string(i).substr(0,2)==to_string(i).substr(2,4)){t++;}
      |                    ^~~~~~~~~
      |                    std::__cxx11::to_string
In file included from /usr/include/c++/14/string:54,
                 from a.cc:2:
/usr/include/c++/14/bits/basic_string.h:4421:3: note: 'std::__cxx11::to_string' declared here
 4421 |   to_string(long double __val)
      |   ^~~~~~~~~
Language: C++

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

int main() {

  int A, B;
  cin >> A >> B;
  int count = 0;
  for (int i = A; i <= B; i++) {
    int s = i % 10;
    int t = (i / 10) % 10;
    int tt = (i / 1000) % 10;
    int ss = (i / 10000) % 10;
    
    it (s == ss && t == tt) {
      count++;
    }
  }
  cout << count << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: 'it' was not declared in this scope; did you mean 'tt'?
   15 |     it (s == ss && t == tt) {
      |     ^~
      |     tt
Language: C

#include <stdio.h>
int main ( )
{
int a , b ;
scanf("%d%d",&a,&b) ;
int r = 0 ;
for(int i = a ; i <= b ; i++)
{
int s = i % 10 , t = i / 10000 % 10;
int u = i / 10 % 10 , v = i / 1000 % 10;
if ( s == t&&u == v ) r++;
1
}
printf("%d\n",r) ;
}

Compiler output:
main.c: In function 'main':
main.c:12:2: error: expected ';' before '}' token
   12 | 1
      |  ^
      |  ;
   13 | }
      | ~
Language: C

#include <stdio.h>
int main ( )
{
int a , b ;
scanf("%d%d",&a,&b) ;
int r = 0 ;
for(int i = a ; i <= b ; i++)
{
int s = i % 1 0 , t = i / 10000 % 10;
int u = i / 10 % 1 0 , v = i / 1000 % 10;
if ( s == t&&u == v ) r++;
1
}
printf("%d\n",r) ;
}

Compiler output:
main.c: In function 'main':
main.c:9:15: error: expected ',' or ';' before numeric constant
    9 | int s = i % 1 0 , t = i / 10000 % 10;
      |               ^
main.c:10:20: error: expected ',' or ';' before numeric constant
   10 | int u = i / 10 % 1 0 , v = i / 1000 % 10;
      |                    ^
main.c:11:11: error: 't' undeclared (first use in this function)
   11 | if ( s == t&&u == v ) r++;
      |           ^
main.c:11:11: note: each undeclared identifier is reported only once for each function it appears in
main.c:11:19: error: 'v' undeclared (first use in this function)
   11 | if ( s == t&&u == v ) r++;
      |                   ^
main.c:12:2: error: expected ';' before '}' token
   12 | 1
      |  ^
      |  ;
   13 | }
      | ~
Language: C++

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

int main() {
  int A, B, tmp;
  int count = 0;
  int s1, s2, s3, s4, s5;
  for(int i = A; i <= B; i++){
    tmp = i;
    s1 = tmp % 10;
    tmp /= 10;
    s2 = tmp % 10;
    tmp /= 10;
    s3 = tmp % 10;
    tmp /= 10;
    s4 = tmp % 10;
    tmp /= 10;
    s5 = tmp % 10;
    if(s1 == s5 && s2 == s4) count++;
  }
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
Language: C++

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

int main() {
  int A,B,x;
  cin>>A>>B;
  x=0;
  for(int i=A;i<=B;i++){
    int N,p1,p2,p4,p5;
    N=i;
    p1=N/10000;
    p5=N%10;
    N=(N-p1*10000-p5)/10;
    p2=N/100;
    p4=N%10;
    if(p1==p5 && P2==p4){x++;}
  }
  cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:18: error: 'P2' was not declared in this scope; did you mean 'p2'?
   16 |     if(p1==p5 && P2==p4){x++;}
      |                  ^~
      |                  p2
Language: C++

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

int main() {
  int A,B,x;
  cin>>A>>B;
  x=0;
  for(int i=A;i<=B,i++){
    int N,p1,p2,p4,p5;
    N=i;
    p1=N/10000;
    p5=N%10;
    N=(N-p1*10000-p5)/10;
    p2=N/100;
    p4=N%10;
    if(p1==p5 && P2==p4){x++;}
  }
  cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: expected ';' before ')' token
    8 |   for(int i=A;i<=B,i++){
      |                       ^
      |                       ;
a.cc:16:18: error: 'P2' was not declared in this scope; did you mean 'p2'?
   16 |     if(p1==p5 && P2==p4){x++;}
      |                  ^~
      |                  p2
Language: C++

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

int main() {
  int A,B,x;
  cin>>A>>B;
  x=0;
  for(int i=A;i<=B,i++){
    int N,p1,p2,p4,p5;
    N=i;
    p1=N/10000;p5=N%10;
    N=(N-p1*10000-p5)/10;
    p2=N/100;p4=N%10;
    if(p1==p5 && P2==p4){x++;}
  }
  cout<<x<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: expected ';' before ')' token
    8 |   for(int i=A;i<=B,i++){
      |                       ^
      |                       ;
a.cc:14:18: error: 'P2' was not declared in this scope; did you mean 'p2'?
   14 |     if(p1==p5 && P2==p4){x++;}
      |                  ^~
      |                  p2
Language: C

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

int p(string x){
    int s = x.size();
    for(int i=0;i<s/2;i++){
        if(x[i] != x[s-i-1]){
            return 0;
        }
    }
    return 1;
}

int main(void){
    int a,b,x;
    int ans = 0;
    cin >> a >> b;
    for(x=a;x<=b;x++){
        ans += p(to_string(x));
    }
    cout << ans << endl;
}

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

#include <bits/stdc++.h>
using namespace std;
int main() {
  int A,B,ans=0;
  cin >> A >> B;
  for(int i=A;i<=B;i++){
    if(i/10000==i%10 && i/1000%10==i/%100/10) ans++;
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:38: error: expected primary-expression before '%' token
    7 |     if(i/10000==i%10 && i/1000%10==i/%100/10) ans++;
      |                                      ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  int A,B,ans=0;
  for(int i=A;i<B;i++){
    if(i/10000==i%10 && i/1000%10==i%100/10)
      ans++;
  }
  cout << ans <, endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:16: error: expected primary-expression before ',' token
    9 |   cout << ans <, endl;
      |                ^
Language: C++

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

int main() {
  int A,B;
  cin >> A >> B;
  int ans = 0;
  for (int i = A; i <= B; i++)
    int x,y;
    x = i/1000;
    y = i%100;
    if (x==y) {
      ans++;
    }
  }
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'x' was not declared in this scope
   10 |     x = i/1000;
      |     ^
a.cc:10:9: error: 'i' was not declared in this scope
   10 |     x = i/1000;
      |         ^
a.cc:11:5: error: 'y' was not declared in this scope
   11 |     y = i%100;
      |     ^
a.cc: At global scope:
a.cc:16:3: error: 'cout' does not name a type
   16 |   cout << ans << endl;
      |   ^~~~
a.cc:17:1: error: expected declaration before '}' token
   17 | }
      | ^
Language: C++

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

int main() {
  int A,B,n,y;
  cin >> A >> B;
  n=A;
  y=0;
  while(A<=n && B>=n){
    s1=n%10;
    s2=n/10%10;
    s3=n/100%10;
    S4=n%1000%10;
    s5=n%10000;
    if(s1==s5 && s2==s3){
       y++;
    }
  }
  cout << y;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 's1' was not declared in this scope; did you mean 'y1'?
   10 |     s1=n%10;
      |     ^~
      |     y1
a.cc:11:5: error: 's2' was not declared in this scope
   11 |     s2=n/10%10;
      |     ^~
a.cc:12:5: error: 's3' was not declared in this scope
   12 |     s3=n/100%10;
      |     ^~
a.cc:13:5: error: 'S4' was not declared in this scope
   13 |     S4=n%1000%10;
      |     ^~
a.cc:14:5: error: 's5' was not declared in this scope
   14 |     s5=n%10000;
      |     ^~
Language: C++

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

int main() {
  int A,B,n,y;
  cin >> A >> B;
  n=A;
  y=0;
  while(A<=n && B>=n){
    s1=N%10;
    s2=N/10%10;
    s3=N/100%10;
    S4=N%1000%10;
    s5=N%10000;
    if(s1==s5 && s2==s3){
       y++;
    }
  }
  cout << y;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 's1' was not declared in this scope; did you mean 'y1'?
   10 |     s1=N%10;
      |     ^~
      |     y1
a.cc:10:8: error: 'N' was not declared in this scope
   10 |     s1=N%10;
      |        ^
a.cc:11:5: error: 's2' was not declared in this scope
   11 |     s2=N/10%10;
      |     ^~
a.cc:12:5: error: 's3' was not declared in this scope
   12 |     s3=N/100%10;
      |     ^~
a.cc:13:5: error: 'S4' was not declared in this scope
   13 |     S4=N%1000%10;
      |     ^~
a.cc:14:5: error: 's5' was not declared in this scope
   14 |     s5=N%10000;
      |     ^~
Language: C++

#include <iostream>
using namespace std;

int main() {
	int a,b,c=0,n,m,l,x,y;
	cin>>a>>b;
	for(i=a;i<=b;i++){
		n=i%10;
		m=(n%100)/10;
		l=(m%1000)/100;
		x=(l%10000)/1000;
		y=(x%100000)/10000;
		if(n==y&&m==x)c++;
	}
	cout<<c;
	
	// your code goes here
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: 'i' was not declared in this scope
    7 |         for(i=a;i<=b;i++){
      |             ^
Language: C++

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

int main() {
  int A, B, ans;
  ans = 0
  
  for (int i = A; i <= B; i++) {
    if ((i / 10000 == i % 10) && (i % 10000 / 1000 == i % 100 / 10)) {
      ans += 1;
    }
  }
  
  cout << ans << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:10: error: expected ';' before 'for'
    6 |   ans = 0
      |          ^
      |          ;
    7 | 
    8 |   for (int i = A; i <= B; i++) {
      |   ~~~     
a.cc:8:19: error: 'i' was not declared in this scope
    8 |   for (int i = A; i <= B; i++) {
      |                   ^
Language: C++

include <iostream>
using namespace std;
int main() {
int a, b, no_count = 0;
cin >> a >> b;
int reversed_a = (a % 10000 / 1000) * 10 + (a / 10000);
int reversed_b = (b % 10000 / 1000) * 10 + (b / 10000);
if (a / 1000 < reversed_a) --no_count;
if (b / 1000 > reversed_b) --no_count;
cout << b / 100 - a / 100 + 1 + no_count << endl;
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <iostream>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:5:1: error: 'cin' was not declared in this scope
    5 | cin >> a >> b;
      | ^~~
a.cc:10:1: error: 'cout' was not declared in this scope
   10 | cout << b / 100 - a / 100 + 1 + no_count << endl;
      | ^~~~
a.cc:10:45: error: 'endl' was not declared in this scope
   10 | cout << b / 100 - a / 100 + 1 + no_count << endl;
      |                                             ^~~~
Language: C++

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

bool is_pal(int i)
{
  string s = to_string(i);
  for(int i=0;i<s.length()/2;i++)
    if(s[i]!=s[n-1-i]) return false;
  return true;
}
int main()
{
 int a,b,c=0;
  cin>>a>>b;
  for(int i=a;i<=b;i++)
    if(is_pal(i))
      c++;
  cout<<c<<"\n";
  
  return 0;
}

Compiler output:
a.cc: In function 'bool is_pal(int)':
a.cc:8:16: error: 'n' was not declared in this scope
    8 |     if(s[i]!=s[n-1-i]) return false;
      |                ^
Language: C++

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

int main() {
  int A, B, n;
  cin >> A >> B;
  int n = 0;
  for (int i = A; i <= B; i++) {
    if ((i/1000-i%100)%9==0 && (i/1000+i%100)%11==0)
      n = n + 1;
  }
  cout << n << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: redeclaration of 'int n'
    7 |   int n = 0;
      |       ^
a.cc:5:13: note: 'int n' previously declared here
    5 |   int A, B, n;
      |             ^
Language: C

#include<stdio.h>
int main()
{
	int a,b,c;
	bool hw(int);
	char n[102];
	while(scanf("%d%d",&a,&b)!=EOF)
	{
		int sum=0;
		for(int i=a;i<=b;i++)
		{
			if(hw(i))
				sum++;
		}
		printf("%d\n",sum);
	}
	return 0;
}
bool hw(int x)
{
    int x1=x;
	if(x<0)
		return false;
	long long y=0;
	while(x)
	{
	    y=y*10+(x%10);
		x=x/10;
	}
	if(y==x1)
	   return true;
	else
	   return false;
}


Compiler output:
main.c: In function 'main':
main.c:5:9: error: unknown type name 'bool'
    5 |         bool hw(int);
      |         ^~~~
main.c:2:1: note: 'bool' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
    1 | #include<stdio.h>
  +++ |+#include <stdbool.h>
    2 | int main()
main.c: At top level:
main.c:19:1: error: unknown type name 'bool'
   19 | bool hw(int x)
      | ^~~~
main.c:19:1: note: 'bool' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
main.c: In function 'hw':
main.c:23:24: error: 'false' undeclared (first use in this function)
   23 |                 return false;
      |                        ^~~~~
main.c:23:24: note: 'false' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
main.c:23:24: note: each undeclared identifier is reported only once for each function it appears in
main.c:31:19: error: 'true' undeclared (first use in this function)
   31 |            return true;
      |                   ^~~~
main.c:31:19: note: 'true' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'