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

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int A, B;
  cin >> A >> B;
  int count = 0;
  
 
    int oneNum = 0;
    int tenNum = 0;
    int hundredNum = 0;
    int thousandNum = 0;
    int tThousandNum = 0;
   
  for (int i = 0; i < 10; i++) {
    tThousandNum = i * 10000;
    oneNum = i;
    for (int J = 0; j < 10; j++) {
      hundredNum = j * 100;
      for (int k = 0; k < 10; k++) {
        thousandNum = k * 1000;
        tenNum = k * 10;
        
        int num = tThousandNum + thousandNum + hundredNum + tenNum + oneNum;
        if (num>=A && num=<B) {
          count++
        }
      }
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:21: error: 'j' was not declared in this scope
   19 |     for (int J = 0; j < 10; j++) {
      |                     ^
a.cc:26:27: error: expected primary-expression before '<' token
   26 |         if (num>=A && num=<B) {
      |                           ^
a.cc:27:18: error: expected ';' before '}' token
   27 |           count++
      |                  ^
      |                  ;
   28 |         }
      |         ~
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  
  int sum = 0;
  for (int i = A; A <= B; i++) {
    if (i == i.reverse()) {
      sum++;
  }
  cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: request for member 'reverse' in 'i', which is of non-class type 'int'
   10 |     if (i == i.reverse()) {
      |                ^~~~~~~
a.cc:14:2: error: expected '}' at end of input
   14 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  
  int sum = 0;
  for (int i = A; A <= B; i++) {
    int s1 = i / 10000;
    int s2 = (i - 10000 * s1) / 1000;
    int s5 = i % 10;
    int s4 = (i - s5) / 10;
    int s3 = (i - s5 - 10 * s4) / 100;
    int number = 10000 * s5 + 1000 * s4 + 100 * s3 + 10 * s2 + s1;
    if (i == number) {
      sum++;
  }
  cout << sum << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:2: error: expected '}' at end of input
   20 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include<bits/stdc++.h>

using namespace std;

#define debug(n) cerr << #n << ':' << n << endl;
#define dline    cerr << __LINE__ << endl;

using ll = long long;
using ull = unsigned long long;
template<class T, class U> using P = pair<T,U>;
template<class T> using Heap = priority_queue<T>;
template<class T> using heaP = priority_queue<T,vector<T>,greater<T>>;
template<class T,class U> using umap = unordered_map<T,U>;
template<class T> using uset = unordered_set<T>;

template<class T>
bool ChangeMax(T&a,const T&b){
  if(a >= b) return false;
  a = b;    return true;
}

template<class T>
bool ChangeMin(T&a,const T&b){
  if(a <= b) return false;
  a = b;    return true;  
}

template<class T, size_t N, class U>
void Fill(T (&a)[N], const U&v){
    fill((U*)a,(U*)(a+N),v);
}

template<class T>
istream& operator >> (istream&is, vector<T>&v){
  for(auto&e:v)is >> e;
  return is;
}

int gcd(int x, int y){
  if(y==0)return x;
  return gcd(y,x%y);
}

int cnter(int n){
  int cnt = 0;
  while(n&&n%2==0){
    cnt++;
    n/=2;
  }
  return cnt;
}

int f(int x){
  int y = 0;
  while(x){
    y += x%10;
    x /= 10;
  }
  return y;
}

bool Ok(int x){
  string s = to_string(x);
  for(int i = 0; i < 4-i; f++i){
    if(s[i] != s[4-i])return false;
  }
  return true;
}

int main(){
  int l,r; cin >> l >> r;
  int cnt = 0;
  for(int i = l; i <= r; ++i){
    cnt += Ok(i);
  }
  cout << cnt << endl;
} 



Compiler output:
a.cc: In function 'bool Ok(int)':
a.cc:64:27: warning: ISO C++ forbids incrementing a pointer of type 'int (*)(int)' [-Wpointer-arith]
   64 |   for(int i = 0; i < 4-i; f++i){
      |                           ^
a.cc:64:28: error: lvalue required as increment operand
   64 |   for(int i = 0; i < 4-i; f++i){
      |                            ^~
a.cc:64:30: error: expected ')' before 'i'
   64 |   for(int i = 0; i < 4-i; f++i){
      |      ~                       ^
      |                              )
a.cc:64:31: error: expected ';' before ')' token
   64 |   for(int i = 0; i < 4-i; f++i){
      |                               ^
      |                               ;
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
#include <cstdlib>

int main() {
  int A, B;
  std::cin >> A >> B;
  
  int cnt = 0;
  for (int num = A; num <= B; ++num) {
  	std::string s = std::itoa(num);
    std::string re = s;
    std::reverse(re.begin(), re.end());
    
    if (s == re) ++cnt;
  }
  std::cout << cnt << std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:30: error: 'itoa' is not a member of 'std'
   12 |         std::string s = std::itoa(num);
      |                              ^~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <string>

int main() {
  int A, B;
  std::cin >> A >> B;
  
  int cnt = 0;
  for (int num = A; num <= B; ++num) {
  	std::string s = std::stoi(num);
    std::string re = s;
    std::reverse(re.begin(), re.end());
    
    if (s == re) ++cnt;
  }
  std::cout << cnt << std::endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:34: error: no matching function for call to 'stoi(int&)'
   11 |         std::string s = std::stoi(num);
      |                         ~~~~~~~~~^~~~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:4164:3: note: candidate: 'int std::__cxx11::stoi(const std::string&, std::size_t*, int)'
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4164:22: note:   no known conversion for argument 1 from 'int' to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4432:3: note: candidate: 'int std::__cxx11::stoi(const std::wstring&, std::size_t*, int)'
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4432:23: note:   no known conversion for argument 1 from 'int' to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~~^~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int A , B;
  cin >> A >> B ;
  int count = 0
  for ( int a=1 ; a<10 ; a++ ) {
    for ( int b=1 ; b<10 ; b++ ){
      for ( int c=1 ; c<10 ; c++ ){
        int x=10000*a+1000*b+100*c+10*b+a; 
        if ( A <= x <= B){
         count +=1; 
        }
      }
    }
  }
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected ',' or ';' before 'for'
    8 |   for ( int a=1 ; a<10 ; a++ ) {
      |   ^~~
a.cc:8:19: error: 'a' was not declared in this scope
    8 |   for ( int a=1 ; a<10 ; a++ ) {
      |                   ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: expected primary-expression before '<' token
    8 |   for(int i=A; i=<B; i++){
      |                  ^
Language: C++

#include <iostream>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:57: error: 'couter' was not declared in this scope; did you mean 'counter'?
    9 |         if(i/10000 == i%10 && (i/1000)%10 == (i/10)%10) couter++;
      |                                                         ^~~~~~
      |                                                         counter
Language: C++

#include <iostrea>
using namespace std;

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

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

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

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


	int j;

	for( int i = A; i =< B ; i++){

		if( i / 10000 == i % 10 ){

			if( i /1000 % 10 == i /10 %10){

				j++;
		
			}

		}


	cout << j << endl;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:28: error: expected primary-expression before '<' token
   11 |         for( int i = A; i =< B ; i++){
      |                            ^
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

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


	int j;

	for( int i = A; i =< B ; i++){

		if( i / 10000 == i % 10 ){

			if( i /1000 % 10 == i /10 %10){

				j++;
		
			}

		}


	cout << j << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:12: error: expected ';' before 'A'
    6 |         cin A, B;
      |            ^~
      |            ;
a.cc:11:28: error: expected primary-expression before '<' token
   11 |         for( int i = A; i =< B ; i++){
      |                            ^
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
  int A,B;
  cin >> A >> B;
  int count = 0;
  for(int i=A; i<=B; i++){
    int a1 = i/10000;
    int a2 = i%10000/1000;
    int a3 = i%1000/100;
    if(i == a1*10000 + a2*1000 + a3*100 + a2*10 + a1){
      count ++
    }
  }
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:15: error: expected ';' before '}' token
   13 |       count ++
      |               ^
      |               ;
   14 |     }
      |     ~
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 a1 = i/10000;
    int a2 = i%10000/1000;
    int a3 = i%1000/100;
    if(i == a1*10000 + a2*1000 + a3*100 + a2*10 + a1){
      count ++
    }
   cout << count << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:15: error: expected ';' before '}' token
   13 |       count ++
      |               ^
      |               ;
   14 |     }
      |     ~          
a.cc:16:2: error: expected '}' at end of input
   16 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

using namespace std;

int main(){
  int nmin,nmax;
  cin >> nmin >> nmax;
  int num;
  int count=0;
  for(int i=nmin;i<=nmax;i++){
	num = to_string(i);
    if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      count++;
    }
  }
  
  cout << count << endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:13:24: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int' in assignment
   13 |         num = to_string(i);
      |               ~~~~~~~~~^~~
      |                        |
      |                        std::string {aka std::__cxx11::basic_string<char>}
a.cc:14:12: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |            ^~
a.cc:14:25: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                         ^~
a.cc:14:38: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                      ^~
a.cc:14:51: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                                   ^~
Language: C++

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

using namespace std;

int main(){
  int nmin,nmax;
  cin >> nmin >> nmax;
  int num;
  int count=0;
  for(int i=nmin;i<=nmax;i++){
	num = stoi(i);
    if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      count++;
    }
  }
  
  cout << count << endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:13:19: error: no matching function for call to 'stoi(int&)'
   13 |         num = stoi(i);
      |               ~~~~^~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:4164:3: note: candidate: 'int std::__cxx11::stoi(const std::string&, std::size_t*, int)'
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4164:22: note:   no known conversion for argument 1 from 'int' to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4432:3: note: candidate: 'int std::__cxx11::stoi(const std::wstring&, std::size_t*, int)'
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4432:23: note:   no known conversion for argument 1 from 'int' to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~~^~~~~
a.cc:14:12: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |            ^~
a.cc:14:25: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                         ^~
a.cc:14:38: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                      ^~
a.cc:14:51: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                                   ^~
Language: C++

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

using namespace std;

int main(){
  int nmin,nmax;
  cin >> nmin >> nmax;
  int num;
  int count=0;
  for(int i=nmin;i<=nmax;i++){
	num = stoi(i);
    if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      count++;
    }
  }
  
  cout << count << endl;
}
  

Compiler output:
a.cc:2:10: error: #include expects "FILENAME" or <FILENAME>
    2 | #include string
      |          ^~~~~~
a.cc: In function 'int main()':
a.cc:13:19: error: no matching function for call to 'stoi(int&)'
   13 |         num = stoi(i);
      |               ~~~~^~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:4164:3: note: candidate: 'int std::__cxx11::stoi(const std::string&, std::size_t*, int)'
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4164:22: note:   no known conversion for argument 1 from 'int' to 'const std::string&' {aka 'const std::__cxx11::basic_string<char>&'}
 4164 |   stoi(const string& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~^~~~~
/usr/include/c++/14/bits/basic_string.h:4432:3: note: candidate: 'int std::__cxx11::stoi(const std::wstring&, std::size_t*, int)'
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |   ^~~~
/usr/include/c++/14/bits/basic_string.h:4432:23: note:   no known conversion for argument 1 from 'int' to 'const std::wstring&' {aka 'const std::__cxx11::basic_string<wchar_t>&'}
 4432 |   stoi(const wstring& __str, size_t* __idx = 0, int __base = 10)
      |        ~~~~~~~~~~~~~~~^~~~~
a.cc:14:12: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |            ^~
a.cc:14:25: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                         ^~
a.cc:14:38: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                      ^~
a.cc:14:51: error: request for member 'at' in 'num', which is of non-class type 'int'
   14 |     if(num.at(0) == num.at(4) && num.at(1) == num.at(3)){
      |                                                   ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int a;
  int b;
  int count=0;

   
  cin >> a >>b;
  
  for (int i = a; i < =b; i++) {
  
   int c;
   int d;
   int e;
   int f;
   int g;
   g=i;
   c=g%10;
   g/=10;
   d=g%10;
   g/=100;
   e=g%10;
   g/=10;
   f=g%10;
  
        if(c==f&&d==e){
       count++;
   }
  }
  cout <<count<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:23: error: expected primary-expression before '=' token
   12 |   for (int i = a; i < =b; i++) {
      |                       ^
Language: C++

int a,b,c;
cin >> a >> b
c = 0

for (i=a, i< b+1, i++){
  d = std::to_string(i);
  if (d[0]==d[4] && d[1]==d[3]){
    c++;
  }
}

cout << c << endl;


Compiler output:
a.cc:2:1: error: 'cin' does not name a type
    2 | cin >> a >> b
      | ^~~
a.cc:12:1: error: 'cout' does not name a type
   12 | cout << c << endl;
      | ^~~~
Language: C++

int a,b,c;
cin >> a >> b
c = 0

for (i=a, i< b+1, i++){
  d = str i;
  if (d[0]==d[4} && d[1]==d[3]){
    c++;
  }

cout << c << endl;

Compiler output:
a.cc:2:1: error: 'cin' does not name a type
    2 | cin >> a >> b
      | ^~~
a.cc:7:25: error: expected constructor, destructor, or type conversion before '==' token
    7 |   if (d[0]==d[4} && d[1]==d[3]){
      |                         ^~
a.cc:11:1: error: 'cout' does not name a type
   11 | cout << c << endl;
      | ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int a,b;
  int digit_10000, digit_1000,digit_100, digit_10, digit_1;
  int count;
  // 変数aで入力を受け取る
  cin >> a,b;
  
 while (a <= b){
   digit_10000 = a/10000;
   digit_1000 = (a - 10000 * digit_10000) /1000
   digit_100 =  (a - 10000 * digit_10000 - 1000 * digit_1000) / 100 ;
   digit_10 = (a - 10000 * digit_10000 - 1000 * digit_1000 - 100 * digit_100) / 10 ;
   digit_1 = (a - 10000 * digit_10000 - 1000 * digit_1000 - 100 * digit_100 - 10 * digit_10) / 1 ;
  
   if ( digit_10000 == digit_1 && digit_1000 == digit_10){
     count++;}
   
   a++;
 }
   
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:48: error: expected ';' before 'digit_100'
   13 |    digit_1000 = (a - 10000 * digit_10000) /1000
      |                                                ^
      |                                                ;
   14 |    digit_100 =  (a - 10000 * digit_10000 - 1000 * digit_1000) / 100 ;
      |    ~~~~~~~~~
Language: C++

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

int main () {
    int A, B;
    cin >> A >> B;
    
    if (A%100+A%10000/1000*10+A/10000<A && B%100+B%10000/1000*10+B/10000>B) {
        cout << B/100-A/100-1 << endl;
    }
    else if (A%100+A%10000/1000*10+A/10000>A && B%100+B%10000/1000*10+B/10000>B) {
        cout << B/100-A/100 << endl;
    }
    else if (A%100+A%10000/1000*10+A/10000<A && B%100+B%10000/1000*10+B/10000<B) {
        cout << B/100-A/100 << endl;
    else {
        cout << B/100-A/100+1 << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:5: error: expected '}' before 'else'
   16 |     else {
      |     ^~~~
a.cc:14:82: note: to match this '{'
   14 |     else if (A%100+A%10000/1000*10+A/10000<A && B%100+B%10000/1000*10+B/10000<B) {
      |                                                                                  ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:62: error: expected ';' before 'sum'
    9 |     if(((i / 10000) == (i % 10)) && ((i / 1000) == (i % 100)) sum++;
      |                                                              ^~~~
      |                                                              ;
a.cc:10:3: error: expected primary-expression before '}' token
   10 |   }
      |   ^
a.cc:9:69: error: expected ')' before '}' token
    9 |     if(((i / 10000) == (i % 10)) && ((i / 1000) == (i % 100)) sum++;
      |       ~                                                             ^
      |                                                                     )
   10 |   }
      |   ~                                                                  
a.cc:10:3: error: expected primary-expression before '}' token
   10 |   }
      |   ^
Language: C++

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

int main(){
  int a, b;
  cin >> a >> b;
  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){
      ans++;
    }
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:7: error: 'ans' was not declared in this scope; did you mean 'abs'?
   11 |       ans++;
      |       ^~~
      |       abs
a.cc:14:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   14 |   cout << ans << endl;
      |           ^~~
      |           abs
Language: C++

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

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

int main() {
  int A,B,C;
  cin >> A >> B;
  C = 0;
  for (int i; i<B ;i++){
    if (i != 0){
      if((i/1000 + i%100)%11 ==0 && i/10000==i%10){
        C++;
      }
    }else{
      i = A;
    }
  }
    cout << C << endl;
}

Compiler output:
a.cc:12:5: error: redefinition of 'int main()'
   12 | int main() {
      |     ^~~~
a.cc:4:5: note: 'int main()' previously defined here
    4 | int main() {
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
#include<numeric>
#define int long long
#define ld long double
#define all(x) x.begin(),x.end()
const int maxn=1000000;
#define what_is(x) cerr << #x << " is " << x << endl;
const int MOD = 1e9 + 7;
using namespace std;
string abc="abcdefghijklmnopqrstuvwxyz";
int powmod(int a, int b, int MOD = MOD){
    if(!a and !b)    return 1ll;
    if(!a)    return a;
    int res = 1ll;
    b %= (MOD - 1ll), a %= MOD;
    while(b){
        if(b%2 == 1)    res = (res * a) % MOD;
        a = (a * a) % MOD;
        b /= 2;
    }
    return res;
}
int popcount(uint32_t n)
{
    n = n - ((n >> 1) & 0x55555555);
    n = (n & 0x33333333) + ((n >> 2) & 0x33333333);
    return ((n + (n >> 4) & 0xF0F0F0F) * 0x1010101) >> 24;
}
bool check(int n) {return (((double)sqrt(n)-floor((double)sqrt(n)))==0);}
vector<bool> sieve(maxn + 1, true);
void fillprime() {
    sieve[0] = sieve[1] = false;
    for (int i = 2; i <= maxn; ++i) {
        if (sieve[i] && (int) i * i <= maxn) {
            for (int j = i * i; j <= maxn; j += i) {
                sieve[j] = false;
            }
        }
    }
}
const int nn=1e5+5;
int arr[100010];
bool ispalindrome(int n){
    int t=0;
    int temp=n;
    while(temp>0)
    {
        t=(t*10)+(temp%10);
        temp/=10;
    }
    if(n==t) return true;
    else return false;
}
void play()
{
    int k=0;
    arr[0]=0;
    for(int i=11;i<=100005;++i)
    {
        if(ispalindrome(i)) arr[i]=arr[i-1]+1;
        else arr[i]=arr[i-1];
    }
}

void solve() {

  //for(int i=0;i<25;++i) cout<<arr[i]<<" ";
   int a,b;
   cin>>a>>b>>c;
   int cnt=0;
   cout<<arr[b]-arr[a]<<"\n";
}
int32_t main() {
    ios_base::sync_with_stdio(false); cin.tie(nullptr); cout.tie(nullptr);
    //fillprime();
    play();
    int t;cin>>t;while(t--)
        solve();
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:69:15: error: 'c' was not declared in this scope
   69 |    cin>>a>>b>>c;
      |               ^
Language: Java

import java.util.Scanner;
 
public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    int A = sc.nextInt();
    int B = sc.nextInt();
    
    int cnt = 0;
    for(int i=A; i<B; i++){
      boolean b = true;
      String temp = String.valueOf(i);
      for(int j; j<temp.length()/2; j++){
        if(temp.charAt(j)!=temp.charAt(temp.length()j-1)){
          b = false;
        }
        if(b){
          cnt++;
        }
      }
    }
    System.out.println(cnt);
  }
}
      
    
    

Compiler output:
Main.java:14: error: ')' or ',' expected
        if(temp.charAt(j)!=temp.charAt(temp.length()j-1)){
                                                    ^
Main.java:14: error: not a statement
        if(temp.charAt(j)!=temp.charAt(temp.length()j-1)){
                                                     ^
Main.java:14: error: ';' expected
        if(temp.charAt(j)!=temp.charAt(temp.length()j-1)){
                                                       ^
3 errors
Language: C++

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

}
cout <<r<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:1: error: 'cin' was not declared in this scope
    5 | cin>>a>>b;
      | ^~~
a.cc:9:15: error: expected ',' or ';' before numeric constant
    9 | int s = i % 1 0 , t = i / 10000 % 1 0;
      |               ^
a.cc:10:20: error: expected ',' or ';' before numeric constant
   10 | int u = i / 10 % 1 0 , v = i / 1000 % 1 0;
      |                    ^
a.cc:11:11: error: 't' was not declared in this scope
   11 | if ( s == t&&u == v ) r++;
      |           ^
a.cc:11:19: error: 'v' was not declared in this scope
   11 | if ( s == t&&u == v ) r++;
      |                   ^
a.cc:14:1: error: 'cout' was not declared in this scope
   14 | cout <<r<<endl;
      | ^~~~
a.cc:14:11: error: 'endl' was not declared in this scope
   14 | cout <<r<<endl;
      |           ^~~~
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++)
    {
        cout << i%100/10 << " " << i%10000/1000 << endl;
        if (i%10 == i/10000 && i%100/10 == (i%10000/1000))
        {
            count++;
        }
    }
    cout << count << 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 <iostream>
#include <string>
using namespace std;
static int a = 0;
int main()
{
        int A, B, Ans = 0;
        string C, D;
        cin >> A >> B;
        while (A < B) {
            D = to_string(A);
            C = D;
            reverse(C.begin(), C.end());
            if (C == D) {
                Ans++;
            }
            A++;
        }
        cout << Ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:13: error: 'reverse' was not declared in this scope
   13 |             reverse(C.begin(), C.end());
      |             ^~~~~~~
Language: C++

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

int main() {
  int A,B,amount;
  cin>>A>>B;
  for(int i=A;i<=B;i++){
    int n1,n2,n3,n4,n5;
    n1=i/10000;
    n2=i/1000-n1*10;
    n3=i/100-n1*100-n2*10;
    n4=i/10-n1*1000-n2*100-n3*10;
    n5=i-n1*10000-n2*1000-n3*100-n4*10;
    if(n1=n5&&n2=n4){
    amount++;
    }
  }
  cout<<amount<<endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:13: error: lvalue required as left operand of assignment
   14 |     if(n1=n5&&n2=n4){
      |           ~~^~~~
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 a = i/10000;
      int b = i/1000 - a*10;
      int c = i/100 - a*100 - b*10;
      int d = i/10 - a*1000 - b*100 - c*10;
      int e = i%10;
      if(a==e && b==d){
        count++;
      }
    }
    cout << count << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: expected ';' before '<=' token
    8 |     for(int i=A,i<=B;i++){
      |                  ^~
      |                  ;
a.cc:8:18: error: expected primary-expression before '<=' token
    8 |     for(int i=A,i<=B;i++){
      |                  ^~
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10;
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  
  while(check > b){
    if(check >= a && check <= b){
      count += 1;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:45:1: warning: no return statement in function returning non-void [-Wreturn-type]
   45 | }
      | ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10;
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  
  while(true){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10;
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  
  while(True){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:22:9: error: 'True' was not declared in this scope
   22 |   while(True){
      |         ^~~~
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10;
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  
  while(True){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5;
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:20:55: error: expected ';' before 'while'
   20 |   check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
      |                                                       ^
      |                                                       ;
   21 | 
   22 |   while(True){
      |   ~~~~~                                                
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10;
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  
  while(True){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:20:55: error: expected ';' before 'while'
   20 |   check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
      |                                                       ^
      |                                                       ;
   21 | 
   22 |   while(True){
      |   ~~~~~                                                
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  
  while(True){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  }
  
  cout << count << endl;
}


Compiler output:
a.cc: In function 'int Main()':
a.cc:14:3: error: expected ',' or ';' before 'if'
   14 |   if(a_1==a_5 && a_2==a_4){
      |   ^~
a.cc:20:55: error: expected ';' before 'while'
   20 |   check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
      |                                                       ^
      |                                                       ;
   21 | 
   22 |   while(True){
      |   ~~~~~                                                
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
Language: C++

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

int Main(){
  int a,b,count=0;
  cin >> a >>b;
  
  int check = a;
  int a_1 = a/10000;
  int a_2 = (a - a_1*10000)/1000;
  int a_3 = (a - a_1*10000 - a_2*1000)/100;
  int a_4 = (a - a_1*10000 - a_2*1000 - a_3*100)/10;
  int a_5 = a - a_1*10000 - a_2*1000 - a_3*100 - a_4*10
  if(a_1==a_5 && a_2==a_4){
    count += 1;
  }
  
  a_4 = a_2;
  a_5 = a_1;
  check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  
  while(1){
    if(check >= a && check <= b){
      count += 1;
    }else if(check > b){
      break;
    }
    
    if(a_3<9){
      a_3 += 1;
    }else if(a_2<9){
      a_3 = 0;
      a_2 += 1;
    }else if(a_1<9){
      a_2 = 0;
      a_1 += 1;
    }else{
      a_1 += 1;
    }
    
    a_5 = a_1;
    a_4 = a_2;
    check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
  }
  
  cout << count << endl;
}

Compiler output:
a.cc: In function 'int Main()':
a.cc:14:3: error: expected ',' or ';' before 'if'
   14 |   if(a_1==a_5 && a_2==a_4){
      |   ^~
a.cc:20:55: error: expected ';' before 'while'
   20 |   check = a_1*10000 + a_2*1000 + a_3*100 + a_4*10 +a_5
      |                                                       ^
      |                                                       ;
   21 | 
   22 |   while(1){
      |   ~~~~~                                                
a.cc:47:1: warning: no return statement in function returning non-void [-Wreturn-type]
   47 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int find(int n){
  int sum[5];
  for(int i=0;i<4;i++){
    sum[i]=n%10;
    n/=10;
  }
  int sum2[5];
  sum2[5]=reverse(sum,sum+5);
  bool kind=true;
  for(int i=0;i<n;i++){
    if(sum[i]!=sum2[i]){
      kind=false;
      return 0;
    }
  }
  if(kind)return 1;
}
int main(){
  int a,b;
  cin >> a >> b;
  int count=0;
  for(int i=a;i<=b;i++){
    count+=find(i);
  }
  cout << count <<endl;
}


Compiler output:
a.cc: In function 'int find(int)':
a.cc:10:18: error: void value not ignored as it ought to be
   10 |   sum2[5]=reverse(sum,sum+5);
      |           ~~~~~~~^~~~~~~~~~~
a.cc:19:1: warning: control reaches end of non-void function [-Wreturn-type]
   19 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int find(int n){
  int sum[5];
  for(int i=0;i<4;i++){
    sum[i]=n%10;
    n/=10;
  }
  int sum2[5];
  sum2[5]=reserve(sum,sum+5);
  bool kind=true;
  for(int i=0;i<n;i++){
    if(sum[i]!=sum2[i]){
      kind=false;
      return 0;
    }
  }
  if(kind)return 1;
}
int main(){
  int a,b;
  cin >> a >> b;
  int count=0;
  for(int i=a;i<=b;i++){
    count+=find(i);
  }
  cout << count <<endl;
}


Compiler output:
a.cc: In function 'int find(int)':
a.cc:10:11: error: 'reserve' was not declared in this scope
   10 |   sum2[5]=reserve(sum,sum+5);
      |           ^~~~~~~
a.cc:19:1: warning: control reaches end of non-void function [-Wreturn-type]
   19 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int find(int n){
  int sum[5];
  for(int i=0;i<4;i++){
    sum[i]=n%10;
    n/=10;
  }
  int sum2[5]=reserve(sum.begin(),sum.end());
  bool kind=true;
  for(int i=0;i<n;i++){
    if(sum[i]!=sum2[i]){
      kind=false;
      return 0;
    }
  }
  if(kind)return 1;
}
int main(){
  int a,b;
  cin >> a >> b;
  int count=0;
  for(i=a;i<=b;i++){
    count+=find(i);
  }
  cout << count <<endl;
}


Compiler output:
a.cc: In function 'int find(int)':
a.cc:9:27: error: request for member 'begin' in 'sum', which is of non-class type 'int [5]'
    9 |   int sum2[5]=reserve(sum.begin(),sum.end());
      |                           ^~~~~
a.cc:9:39: error: request for member 'end' in 'sum', which is of non-class type 'int [5]'
    9 |   int sum2[5]=reserve(sum.begin(),sum.end());
      |                                       ^~~
a.cc:9:15: error: 'reserve' was not declared in this scope
    9 |   int sum2[5]=reserve(sum.begin(),sum.end());
      |               ^~~~~~~
a.cc: In function 'int main()':
a.cc:23:7: error: 'i' was not declared in this scope
   23 |   for(i=a;i<=b;i++){
      |       ^
a.cc: In function 'int find(int)':
a.cc:18:1: warning: control reaches end of non-void function [-Wreturn-type]
   18 | }
      | ^
Language: C++

#include <iostream>
using namespace std;

int ReverseDigits(int n){
  int reverse[100010];
  for ( i = 0; i < ; i++) {
    /* code */


  }
  return reverse;
}

int main() {
  int A,B;
  std::cin >>A>>B;
  int res=0;
  for (size_t i = 0; A<=i && i <=B; i++) {
    /* code */
    if(i%10==(i-i%10000) && (i%10000-i%1000)==((i%100-i%10)))res++;
  }
  std::cout << res << '\n';


}


Compiler output:
a.cc: In function 'int ReverseDigits(int)':
a.cc:6:9: error: 'i' was not declared in this scope
    6 |   for ( i = 0; i < ; i++) {
      |         ^
a.cc:6:20: error: expected primary-expression before ';' token
    6 |   for ( i = 0; i < ; i++) {
      |                    ^
a.cc:11:10: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   11 |   return reverse;
      |          ^~~~~~~
      |          |
      |          int*
Language: C++

//Palindromic Numbers

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

int main()
{
  int A, B;
  cin >> A >> B;
  int count;
  for (int i = A; i <= B; i++)
  {
    int s=i%10,t=i/10000%10;//1の位、一万の位
    int u=i/10%10, v=i/1000%10;
    if(s==t && u==v) count++;
  }
  cout<<coutn<<endl;
}


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

#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, a, b, c, d, e, g, h, i;
  cin >> a >> b;
  for(i=0;i<b-a+1;i++) {
    c=0;
    e=a+i;
    for(e > 0) {
      e /= 10;
      c++;
    }
    for(j=0;j<c;j++) {
      while(e-j=1) {
        g=1
        for(k=0;k<e-j;k++) {
          g*=10;
        }       
          d += (a+1) % 10 * g;
        (a+1) /= 10;
      }
    }
    e = a+i;
    if(d == e) {
      h++
    }
  }
  cout << h << endl;
  return 0;
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: expected ';' before ')' token
    9 |     for(e > 0) {
      |              ^
      |              ;
a.cc:13:5: error: expected primary-expression before 'for'
   13 |     for(j=0;j<c;j++) {
      |     ^~~
a.cc:12:6: error: expected ';' before 'for'
   12 |     }
      |      ^
      |      ;
   13 |     for(j=0;j<c;j++) {
      |     ~~~
a.cc:13:5: error: expected primary-expression before 'for'
   13 |     for(j=0;j<c;j++) {
      |     ^~~
a.cc:12:6: error: expected ')' before 'for'
   12 |     }
      |      ^
      |      )
   13 |     for(j=0;j<c;j++) {
      |     ~~~
a.cc:9:8: note: to match this '('
    9 |     for(e > 0) {
      |        ^
a.cc:13:9: error: 'j' was not declared in this scope
   13 |     for(j=0;j<c;j++) {
      |         ^
a.cc:15:12: error: expected ';' before 'for'
   15 |         g=1
      |            ^
      |            ;
   16 |         for(k=0;k<e-j;k++) {
      |         ~~~ 
a.cc:16:17: error: 'k' was not declared in this scope
   16 |         for(k=0;k<e-j;k++) {
      |                 ^
a.cc:20:11: error: lvalue required as left operand of assignment
   20 |         (a+1) /= 10;
      |         ~~^~~
a.cc:25:10: error: expected ';' before '}' token
   25 |       h++
      |          ^
      |          ;
   26 |     }
      |     ~
Language: C++

#include<iostream>
using namespace std;

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


Compiler output:
a.cc: In function 'int main()':
a.cc:12:75: error: expected ';' before 'count'
   12 |     if ((i / 10000 == i % 10) && ( ((i / 1000) % 10) == ((i % 100) / 10) ) count ++;
      |                                                                           ^~~~~~
      |                                                                           ;
a.cc:13:3: error: expected primary-expression before '}' token
   13 |   }
      |   ^
a.cc:12:85: error: expected ')' before '}' token
   12 |     if ((i / 10000 == i % 10) && ( ((i / 1000) % 10) == ((i % 100) / 10) ) count ++;
      |        ~                                                                            ^
      |                                                                                     )
   13 |   }
      |   ~                                                                                  
a.cc:13:3: error: expected primary-expression before '}' token
   13 |   }
      |   ^
Language: C++

#include<iostream>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:12:70: error: expected primary-expression before ')' token
   12 |     if ((i / 10000 == i % 10) && ((i / 1000) % 10) == (i % 100) / 10)) count ++;
      |                                                                      ^
Language: C++

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

int main() {
  int A, B;
  cin >> A >> B;
  int n = 0;
  
  for (int i = A; i < B + 1; i++) {
    int p, q, r, s, t;
    p = i / 1 % 10;
    q = i / 10 % 10;
    r = i / 100 % 10;
    s = i / 1000 % 10;
    t = i / 10000;
    
    j = 10000*p + 1000*q + 100*r + 10*s + t;
      
    if (i == j)
      n += 1;
    else if (i != j)
      n += 0;
  }   
      cout << n << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:5: error: 'j' was not declared in this scope
   17 |     j = 10000*p + 1000*q + 100*r + 10*s + t;
      |     ^