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

#include <iostream>
#include <string>
using namespace std;
int main(){
    string a, b, c;
    cin >> a >> b >> c;
    hen = (int)b[0] - 0x20
    cout << a[0] << (char)hen << c[0] << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'hen' was not declared in this scope
    7 |     hen = (int)b[0] - 0x20
      |     ^~~
Language: C++

#include <iostream>
#include <string>
using namespace std;
int main(){
    string =  a, b, c;
    cin >> a >> b >> c;
    a = a[0]; b = b[0] - 0x20; c = c[0];
    cout << a+b+c << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: expected unqualified-id before '=' token
    5 |     string =  a, b, c;
      |            ^
a.cc:6:12: error: 'a' was not declared in this scope
    6 |     cin >> a >> b >> c;
      |            ^
a.cc:6:17: error: 'b' was not declared in this scope
    6 |     cin >> a >> b >> c;
      |                 ^
a.cc:6:22: error: 'c' was not declared in this scope
    6 |     cin >> a >> b >> c;
      |                      ^
Language: C++

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

int main() {
  int s;
  cin >> s >> s;
  
  cout << s.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: request for member 'at' in 's', which is of non-class type 'int'
    8 |   cout << s.at(0) << endl;
      |             ^~
Language: C++

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

string x;
cin>>x;

cout<<"AtCoder"<<""<<x.at(0)<<""<<Contest<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:35: error: 'Contest' was not declared in this scope; did you mean 'const'?
    8 | cout<<"AtCoder"<<""<<x.at(0)<<""<<Contest<<endl;
      |                                   ^~~~~~~
      |                                   const
Language: C++

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

// -------------------
// ここから先は変更しない
// -------------------
int main() {
	string name;
	cin >>name;
    
    cout << "A"+name[8]+"C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   11 |     cout << "A"+name[8]+"C" << endl;
      |                        ^~~~
      |                         |
      |                         const char [2]
Language: C++

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

// -------------------
// ここから先は変更しない
// -------------------
int main() {
	string name;
	cin >>name;
    
    cout << "A"+str[8]+"C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:17: error: 'str' was not declared in this scope; did you mean 'std'?
   11 |     cout << "A"+str[8]+"C" << endl;
      |                 ^~~
      |                 std
Language: C++

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

// -------------------
// ここから先は変更しない
// -------------------
int main() {
	string name,;
	cin >>name;
    
    cout << "A"+name[8]+"C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: expected unqualified-id before ';' token
    8 |         string name,;
      |                     ^
a.cc:11:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   11 |     cout << "A"+name[8]+"C" << endl;
      |                        ^~~~
      |                         |
      |                         const char [2]
Language: C++

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

// -------------------
// ここから先は変更しない
// -------------------
int main() {
	string name,;
	cin >>name;
    
    cout << "A"+str[8]+"C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: expected unqualified-id before ';' token
    8 |         string name,;
      |                     ^
a.cc:11:17: error: 'str' was not declared in this scope; did you mean 'std'?
   11 |     cout << "A"+str[8]+"C" << endl;
      |                 ^~~
      |                 std
Language: C++

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

int main() {
string s,t,u;
cin >> s >>t >> u;
cout << A << t.at(0) << C << endl;
 }

Compiler output:
a.cc: In function 'int main()':
a.cc:10:9: error: 'A' was not declared in this scope
   10 | cout << A << t.at(0) << C << endl;
      |         ^
a.cc:10:25: error: 'C' was not declared in this scope
   10 | cout << A << t.at(0) << C << endl;
      |                         ^
Language: C++

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

int main(){
  string s;
  cin >> s;
  cout << 'A' s.at(1) 'C' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:14: error: expected ';' before 's'
    7 |   cout << 'A' s.at(1) 'C' << endl;
      |              ^~
      |              ;
Language: C++

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

int main() {
  string= a,b,c;
   cin>>a>>b>>c;
  
  cout<<a.at(0)<<b.at(0)<<c.at(0)<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: expected unqualified-id before '=' token
    5 |   string= a,b,c;
      |         ^
a.cc:6:9: error: 'a' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |         ^
a.cc:6:12: error: 'b' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |            ^
a.cc:6:15: error: 'c' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |               ^
Language: C++

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

int main() {
  string= a,b,c;
   cin>>a>>b>>c;
  
  cout<<a.at(1)<<b.at(1)<<c.at(1)<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: expected unqualified-id before '=' token
    5 |   string= a,b,c;
      |         ^
a.cc:6:9: error: 'a' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |         ^
a.cc:6:12: error: 'b' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |            ^
a.cc:6:15: error: 'c' was not declared in this scope
    6 |    cin>>a>>b>>c;
      |               ^
Language: C++

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

int main() {
  string A,B,C;
  cin>>A>>B>>C
  
  cout<<A.at(1)<<B.at(1)<<C.at(1)<<endl;
  
  
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: expected ';' before 'cout'
    6 |   cin>>A>>B>>C
      |               ^
      |               ;
    7 | 
    8 |   cout<<A.at(1)<<B.at(1)<<C.at(1)<<endl;
      |   ~~~~
Language: C++


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

int main(){
    string a, b, c;
    cin >> a >> b >> c;
    cout << "A" + b.at(0) + "C" << endl;
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:27: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |     cout << "A" + b.at(0) + "C" << endl;
      |             ~~~~~~~~~~~~~ ^ ~~~
      |                 |           |
      |                 const char* const char [2]
Language: C++

#include <iostream>
using namespace std;
int main()
{
  stirng a, b, c;
  cin >> a >> b >> c;
  cout << "A" << b[0] << "C";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'stirng' was not declared in this scope
    5 |   stirng a, b, c;
      |   ^~~~~~
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |          ^
a.cc:6:15: error: 'b' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |               ^
a.cc:6:20: error: 'c' was not declared in this scope
    6 |   cin >> a >> b >> c;
      |                    ^
Language: C++

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

int main() {
  for (int i = 0; i < 3; i++) {
    string c;
    cin >> c;
    string a;
    a += c.at(0);
  }
  cout << a << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:11: error: 'a' was not declared in this scope
   11 |   cout << a << endl;
      |           ^
Language: C++

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

int main() {
  for (int i = 0; i < 3; i++) {
    string c;
    cin >> c;
    I = c.at(0)
    cout << I << endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'I' was not declared in this scope
    8 |     I = c.at(0)
      |     ^
a.cc:10:2: error: expected '}' at end of input
   10 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
  for (int i = 0; i < 3; i++) {
    string c;
    cin >> c;
    cout << c.at(0) << endl;
}
  


Compiler output:
a.cc: In function 'int main()':
a.cc:9:2: error: expected '}' at end of input
    9 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

#include<iostream>
#include<algorithm>
#include<cmath>
#include<vector>
#include<map>
#include<set>
#include<string>

#define fast_io ios_base::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);

using namespace std;

//inline int read(){int t = 0;int neg=1;char c;while((c=getchar_unlocked())!='\n'&&c!=' '&&c!=EOF){if(c=='-'){neg=-1;continue;}t=t*10+c-48;}return neg*t;}
//inline int readl(){long long t = 0;long long neg=1ll;char c;while((c=getchar_unlocked())!='\n'&&c!=' '&&c!=EOF){if(c=='-'){neg=-1ll;continue;}t=t*10+c-48;}return neg*t;}

#define debug(x) cout<<(#x)<<"="<<(x)<<", ";
#define debug1(x) debug(x) cout<<'\n';
#define debug2(x1, x2) debug(x1) debug(x2) cout<<'\n';
#define debug3(x1, x2, x3) debug(x1) debug(x2) debug(x3) cout<<'\n';
#define debug4(x1, x2, x3, x4) debug(x1) debug(x2) debug(x3) debug(x4) cout<<'\n';
#define debug5(x1, x2, x3, x4, x5) debug(x1) debug(x2) debug(x3) debug(x4) debug(x5) cout<<'\n';

typedef long long int lli;
typedef unsigned long long int ulli;
typedef pair<int,int> pi;
typedef pair<lli,lli> plli;
typedef vector<int> vi;
typedef vector<lli> vlli;
typedef vector<pi> vpi;
typedef vector<plli> vplli;
const lli M=1000000007ll;

int main(){
	fast_io
	string s;.cin>>s>>s;
	cout<<"A"<<s[0]<<"C"; 
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:35:18: error: expected primary-expression before '.' token
   35 |         string s;.cin>>s>>s;
      |                  ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  cin>>S;
  cout<'A'+S.at(0)+'C'<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
    8 |   cout<'A'+S.at(0)+'C'<<endl;
      |        ~~~~~~~~~~~~~~~^~~~~~
Language: C++

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

int main() {
  string S;
  cin >> S;
  S="A"+S.at(8)+"C";
  cout<<S<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   S="A"+S.at(8)+"C";
      |     ~~~~~~~~~~~^~~~
      |        |        |
      |        |        const char [2]
      |        const char*
Language: C++

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

int main() {
  string S;
  cin >> S;
  cout<<"A"+S.at(8)+"C"<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout<<"A"+S.at(8)+"C"<<endl;
      |         ~~~~~~~~~~~^~~~
      |            |        |
      |            |        const char [2]
      |            const char*
Language: C++

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

int main() {
  string S;
  cin >> S;
  S='A'+S.at(8)+'C'
  cout<<S<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: expected ';' before 'cout'
    7 |   S='A'+S.at(8)+'C'
      |                    ^
      |                    ;
    8 |   cout<<S<<endl;
      |   ~~~~
Language: C++

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

int main(){
  string AtCoder, Contest;
  string s;
  cin >> AtCoder >> s >> Contest;
  
  cout << Atcoder.at(0) << s.at(0) << Contest.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: 'Atcoder' was not declared in this scope; did you mean 'AtCoder'?
    9 |   cout << Atcoder.at(0) << s.at(0) << Contest.at(0) << endl;
      |           ^~~~~~~
      |           AtCoder
Language: C++

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

int main() {
  string atcoder,s,contest;
  cin >> atcoder >> s >> contest;
  char a;
  a=s.at(0);
  cout << "A"+a+"C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:16: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A"+a+"C" << endl;
      |           ~~~~~^~~~
      |              |  |
      |              |  const char [2]
      |              const char*
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main() {
	string s;
  	string a, b;
	cin >> a >> s >> b >>;

	cout << 'A' << s.at(0) << 'C' << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:30: error: expected primary-expression before ';' token
    8 |         cin >> a >> s >> b >>;
      |                              ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  getline(cin, S);
  
  cout << "A" + S[8] + "C" << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:22: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout << "A" + S[8] + "C" << endl;
      |                      ^ ~~~
      |                        |
      |                        const char [2]
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  getLine(cin, S);
  
  cout << "A" + S[8] + "C" << endl;
  
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'getLine' was not declared in this scope; did you mean 'getline'?
    6 |   getLine(cin, S);
      |   ^~~~~~~
      |   getline
a.cc:8:22: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout << "A" + S[8] + "C" << endl;
      |                      ^ ~~~
      |                        |
      |                        const char [2]
Language: C++

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

  cout << 'A' + string.at(8) + 'C';
  
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:23: error: expected primary-expression before '.' token
    8 |   cout << 'A' + string.at(8) + 'C';
      |                       ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: expected initializer before 'B'
    5 |   string A B C;
      |            ^
a.cc:6:7: error: 'A' was not declared in this scope
    6 |  cin>>A>>B>>C;
      |       ^
a.cc:6:10: error: 'B' was not declared in this scope
    6 |  cin>>A>>B>>C;
      |          ^
a.cc:6:13: error: 'C' was not declared in this scope
    6 |  cin>>A>>B>>C;
      |             ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: expected initializer before 'B'
    5 |   string A B C;
      |            ^
a.cc:6:8: error: 'A' was not declared in this scope
    6 |   cin>>A>>B>>C;
      |        ^
a.cc:6:11: error: 'B' was not declared in this scope
    6 |   cin>>A>>B>>C;
      |           ^
a.cc:6:14: error: 'C' was not declared in this scope
    6 |   cin>>A>>B>>C;
      |              ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(){
  string a, b, c;
  cin >> a >> b >> c;
  char center;
  center = b.at(0);
  cout << "A" + center + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A" + center + "C" << endl;
      |           ~~~~~~~~~~~~ ^ ~~~
      |               |          |
      |               |          const char [2]
      |               const char*
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(){
  string str;
  getline(cin, str);
  char center;
  center = str.at(9);
  cout << "A" + center + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:24: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A" + center + "C" << endl;
      |           ~~~~~~~~~~~~ ^ ~~~
      |               |          |
      |               |          const char [2]
      |               const char*
Language: C++

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

int main(){
  string str;
  getline(cin, str);
  char center;
  center = str.at(9)
  cout << "A" + center + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:21: error: expected ';' before 'cout'
    8 |   center = str.at(9)
      |                     ^
      |                     ;
    9 |   cout << "A" + center + "C" << endl;
      |   ~~~~
Language: C++

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

int main(){
  string a, b, c;
  cin >> a >> b >> c;
  cout << a.at(0)+" "+b.at(0)+" "+c.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:30: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << a.at(0)+" "+b.at(0)+" "+c.at(0) << endl;
      |           ~~~~~~~~~~~~~~~~~~~^~~~
      |                      |        |
      |                      |        const char [2]
      |                      const char*
Language: C++

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

int main(){
  string s,a,b;
  cin >>a>>s>>b;
  
  cout<<"A"+s[0]+"C";
 return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout<<"A"+s[0]+"C";
      |                 ^~~~
      |                  |
      |                  const char [2]
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  string A,s,C;
  char x;
  cin>>A>>S>>C;
  x = s.at(0);
  cout<<'A'<<x<<'C'<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: 'S' was not declared in this scope
    7 |   cin>>A>>S>>C;
      |           ^
Language: C++

#include <bits/stdc++.h>
using mamespace std;
int main(){
  string s;
  cin>>"Atcoder">>s>>"Contest";
  cout<<"A"<<s.at(0)<<"C"<<endl;}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'mamespace'
    2 | using mamespace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: 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:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>"Atcoder">>s>>"Contest";
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:5:19: error: 's' was not declared in this scope
    5 |   cin>>"Atcoder">>s>>"Contest";
      |                   ^
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<"A"<<s.at(0)<<"C"<<endl;}
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |   cout<<"A"<<s.at(0)<<"C"<<endl;}
      |                            ^~~~
      |                            std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using mamespace std;
int main(){
  string s;
  cin>>"Atcoder">>s>>"Contest";
  cout<<"A"+s.at(0)+"C"<<endl;}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'mamespace'
    2 | using mamespace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: 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:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>"Atcoder">>s>>"Contest";
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:5:19: error: 's' was not declared in this scope
    5 |   cin>>"Atcoder">>s>>"Contest";
      |                   ^
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<"A"+s.at(0)+"C"<<endl;}
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |   cout<<"A"+s.at(0)+"C"<<endl;}
      |                          ^~~~
      |                          std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using mamespace std;
int main(){
  string s;
  cin>>"Atcoder"<<s<<"Contest";
  cout<<"A"<<s.at(0)<<"C"<<endl;}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'mamespace'
    2 | using mamespace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: 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:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>"Atcoder"<<s<<"Contest";
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:5:19: error: 's' was not declared in this scope
    5 |   cin>>"Atcoder"<<s<<"Contest";
      |                   ^
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<"A"<<s.at(0)<<"C"<<endl;}
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:28: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |   cout<<"A"<<s.at(0)<<"C"<<endl;}
      |                            ^~~~
      |                            std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using mamespace std;
int main(){
  string s;
  cin>>"Atcoder"<<s<<"Contest";
  cout<<"A"+s.at(0)+"C"<<endl;}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'mamespace'
    2 | using mamespace std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: 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:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>"Atcoder"<<s<<"Contest";
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:5:19: error: 's' was not declared in this scope
    5 |   cin>>"Atcoder"<<s<<"Contest";
      |                   ^
a.cc:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout<<"A"+s.at(0)+"C"<<endl;}
      |   ^~~~
      |   std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:6:26: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |   cout<<"A"+s.at(0)+"C"<<endl;}
      |                          ^~~~
      |                          std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

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

int main() {
  string S;
  cin >> S;
  cout << A << S.at(0) << C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: 'A' was not declared in this scope
    7 |   cout << A << S.at(0) << C << endl;
      |           ^
a.cc:7:27: error: 'C' was not declared in this scope
    7 |   cout << A << S.at(0) << C << endl;
      |                           ^
Language: C++

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

int main() {
  string A, B, C;
  cin >> A >> B >> C;
  char b = B.at(0);
  string name;
  name = "A"+b+"C";
  cout << name << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:15: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   name = "A"+b+"C";
      |          ~~~~~^~~~
      |             |  |
      |             |  const char [2]
      |             const char*
Language: C++

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

int main(){
  string x,y,z;
  cin >> x >> y >> z;
  cout << A << y << C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: 'A' was not declared in this scope
    7 |   cout << A << y << C << endl;
      |           ^
a.cc:7:21: error: 'C' was not declared in this scope
    7 |   cout << A << y << C << endl;
      |                     ^
Language: C++

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

int main() {
  string a, b, c;
  cin >> a >> b >> c;
  
  cout << a.at(o) << b.at(0) << c.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: 'o' was not declared in this scope
    8 |   cout << a.at(o) << b.at(0) << c.at(0) << endl;
      |                ^
Language: C++

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

int main() {
  string a, b, c;
  cin >> a >> b >> c;
  
  cout >> a.at(o) >> b.at(0) >> c.at(0) >> endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: 'o' was not declared in this scope
    8 |   cout >> a.at(o) >> b.at(0) >> c.at(0) >> endl;
      |                ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string s;
  cin >> s;
  char x;
  x = s.at(i);
  cout << "A" << x << "C" <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:12: error: 'i' was not declared in this scope
    8 |   x = s.at(i);
      |            ^
Language: Java

package atcoder;

import java.util.Scanner;

/** https://atcoder.jp/contests/abc048/tasks/abc048_b */
public class B048 {

  /** 入力値A */
  private static int a;

  /** 入力値B */
  private static int b;

  /** 入力値X */
  private static int X;

  /**
   * メインメソッド
   *
   * @param args 実行時引数
   */
  public static void main(String[] args) {
    inputDate();
    System.out.println(getCount(b) - getCount(a - 1));
  }

  /** 入力値設定 */
  private static void inputDate() {
    var sc = new Scanner(System.in);
    a = sc.nextInt();
    b = sc.nextInt();
    X = sc.nextInt();
  }

  /**
   * Xで割り切れる数を取得
   *
   * @param targetNum 数値
   * @return count 個数
   */
  private static int getCount(int targetNum) {

    // a == 0 の場合
    if (targetNum == -1) {
      return 0;
    } else {
      return targetNum / X;
    }
  }
}


Compiler output:
Main.java:6: error: class B048 is public, should be declared in a file named B048.java
public class B048 {
       ^
1 error
Language: C++

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

int main() {
  string a,b,c,x,y,z;
  cin >> a,b,c;

  // ここにプログラムを追記
  x = a.at(0);
  y = b.at(0);
  z = c.at(0);
  cout << xyz << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: 'xyz' was not declared in this scope
   12 |   cout << xyz << endl;
      |           ^~~
Language: C++

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

int main() {
  string a,b,c,x,y,z;
  cin >> a,b,c;

  // ここにプログラムを追記
  x = a.at(0);
  y = a.at(0);
  z = c.at(0);
  cout << xyz << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: 'xyz' was not declared in this scope
   12 |   cout << xyz << endl;
      |           ^~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A << s.at(0) << C << endl;
      |           ^
a.cc:8:27: error: 'C' was not declared in this scope
    8 |   cout << A << s.at(0) << C << endl;
      |                           ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:18: error: expected ';' before '}' token
    8 |     cout<<a.at(0)
      |                  ^
      |                  ;
    9 |   }
      |   ~
Language: C++

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

int main() {
 string s;
  cin >> s;
  cout << A << s.at(8) << C << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: 'A' was not declared in this scope
    7 |   cout << A << s.at(8) << C << endl;
      |           ^
a.cc:7:27: error: 'C' was not declared in this scope
    7 |   cout << A << s.at(8) << C << endl;
      |                           ^
Language: C++

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

int main() {
    string a;
  for(int i=0;i<3;i++){
    cin>>a;
    cout<<str.at(0)
  }
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'str' was not declared in this scope; did you mean 'std'?
    8 |     cout<<str.at(0)
      |           ^~~
      |           std
Language: C++

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

int main() {
  int main() {
    string a;
  for(int i=0;i<3;i++){
    cin>>a;
    cout<<str.at(0)
  }
  
}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:11: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
    5 |   int main() {
      |           ^~
a.cc:5:11: note: remove parentheses to default-initialize a variable
    5 |   int main() {
      |           ^~
      |           --
a.cc:5:11: note: or replace parentheses with braces to value-initialize a variable
a.cc:5:14: error: a function-definition is not allowed here before '{' token
    5 |   int main() {
      |              ^
Language: C++

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

int main(){
  string data;
  getline(cin,data,' ');
  cout<<data[0][0]<<data[1][0]<<data[2][0];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |   cout<<data[0][0]<<data[1][0]<<data[2][0];
      |                ^
a.cc:8:28: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |   cout<<data[0][0]<<data[1][0]<<data[2][0];
      |                            ^
a.cc:8:40: error: invalid types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type {aka char}[int]' for array subscript
    8 |   cout<<data[0][0]<<data[1][0]<<data[2][0];
      |                                        ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  char S = S.at(0);
  
  cout << "A" << S << "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: conflicting declaration 'char S'
    7 |   char S = S.at(0);
      |        ^
a.cc:5:10: note: previous declaration as 'std::string S'
    5 |   string S;
      |          ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  char S = at.(0);
  
  cout << "A" << S << "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: conflicting declaration 'char S'
    7 |   char S = at.(0);
      |        ^
a.cc:5:10: note: previous declaration as 'std::string S'
    5 |   string S;
      |          ^
a.cc:7:12: error: 'at' was not declared in this scope
    7 |   char S = at.(0);
      |            ^~
a.cc:7:15: error: expected unqualified-id before '(' token
    7 |   char S = at.(0);
      |               ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  char S = at.(0);
  
  cout << "A" + S + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: conflicting declaration 'char S'
    7 |   char S = at.(0);
      |        ^
a.cc:5:10: note: previous declaration as 'std::string S'
    5 |   string S;
      |          ^
a.cc:7:12: error: 'at' was not declared in this scope
    7 |   char S = at.(0);
      |            ^~
a.cc:7:15: error: expected unqualified-id before '(' token
    7 |   char S = at.(0);
      |               ^
Language: C++

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

int main() {
  string S;
  cin >> S;
  
  cout << "A" + S.at(0) + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    8 |   cout << "A" + S.at(0) + "C" << endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

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

int main() {
  string S;
  cin >> S;
  
  cout << "A" + "S.at(0)" + "C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: invalid operands of types 'const char [2]' and 'const char [8]' to binary 'operator+'
    8 |   cout << "A" + "S.at(0)" + "C" << endl;
      |           ~~~ ^ ~~~~~~~~~
      |           |     |
      |           |     const char [8]
      |           const char [2]
Language: C++

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

int main() {
  string S;
  cin >> S;
  
  cout << A + "S.at(0)" + C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A + "S.at(0)" + C << endl;
      |           ^
a.cc:8:27: error: 'C' was not declared in this scope
    8 |   cout << A + "S.at(0)" + C << endl;
      |                           ^
Language: C++

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

int main () {
  string x, y, z, w;
  cin >> x >> y >> z;
    
  cout << A+y.at(0)+C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A+y.at(0)+C << endl;
      |           ^
a.cc:8:21: error: 'C' was not declared in this scope
    8 |   cout << A+y.at(0)+C << endl;
      |                     ^
Language: C++

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


int main() {
  string s;
  cin >> s;
  cout << A << s[7] << C << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:11: error: 'A' was not declared in this scope
   10 |   cout << A << s[7] << C << endl;
      |           ^
a.cc:10:24: error: 'C' was not declared in this scope
   10 |   cout << A << s[7] << C << endl;
      |                        ^
Language: C++

#include<stdio.h>
const int maxk=100001;
using namespace std;
int main()
{

    char s[maxk];
   gets(s);
    char k=s[8];
    printf("A%cC",k);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:4: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |    gets(s);
      |    ^~~~
      |    getw
Language: C++

#include<bits/stdc++.h>
const int maxk=100001;
using namespace std;
int main()
{

    char s[maxk];
   gets(s);
    char k=s[8];
    printf("A%cC",k);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:4: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |    gets(s);
      |    ^~~~
      |    getw
Language: C++

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

int main() {
  string s;
  cin >> s;
  char x = s.at(0);
  cout << A << x << C;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A << x << C;
      |           ^
a.cc:8:21: error: 'C' was not declared in this scope
    8 |   cout << A << x << C;
      |                     ^
Language: C++

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

char main() {
  string a, b, c;
  cin >> a >> b >> c;
  cout << a.at(0) + b.at(0) + c.at(0) << endl;
}


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

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

int main() {
  string a, b, c;
  cin >> a >> b >> c;
  cout << a.at(1) + b.at(!) + c.at(!) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:27: error: expected primary-expression before ')' token
    7 |   cout << a.at(1) + b.at(!) + c.at(!) << endl;
      |                           ^
a.cc:7:37: error: expected primary-expression before ')' token
    7 |   cout << a.at(1) + b.at(!) + c.at(!) << endl;
      |                                     ^
Language: C++

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

int main() {
  string a,b,c;
  cin >> a >> b >> c;
  cout << a.at(1) + b.at(!) + c.at(!) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:27: error: expected primary-expression before ')' token
    7 |   cout << a.at(1) + b.at(!) + c.at(!) << endl;
      |                           ^
a.cc:7:37: error: expected primary-expression before ')' token
    7 |   cout << a.at(1) + b.at(!) + c.at(!) << endl;
      |                                     ^
Language: C++

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

int main() {
  int name;
  cin >> name;
  char x = name.at(9);
  cout << 'A' + 'x' + 'C' << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: request for member 'at' in 'name', which is of non-class type 'int'
    7 |   char x = name.at(9);
      |                 ^~
Language: C++

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

int main() {
  int name;
  cin >> name;
  int x = name.at(9);
  cout << 'A' + 'x' + 'C' << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: request for member 'at' in 'name', which is of non-class type 'int'
    7 |   int x = name.at(9);
      |                ^~
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: expected ';' before 'c'
    7 |   cout << "Atcoder" c "Contest" << endl;
      |                    ^~
      |                    ;
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected ',' or ';' before 'cin'
    6 |   cin >> S;
      |   ^~~
a.cc:7:20: error: unable to find string literal operator 'operator""Atcoder' with 'const char [1]', 'long unsigned int' arguments
    7 |   cout << ""Atcoder"" c ""Contest"" << endl;
      |                    ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string S;
  char c = S.at(0)
  cin >> S;
  cout << Atcoder c Contest << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected ',' or ';' before 'cin'
    6 |   cin >> S;
      |   ^~~
a.cc:7:11: error: 'Atcoder' was not declared in this scope
    7 |   cout << Atcoder c Contest << endl;
      |           ^~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string S;
  char c = S.at(0)
  cin >> S;
  cout << Atcoder c Contest
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected ',' or ';' before 'cin'
    6 |   cin >> S;
      |   ^~~
a.cc:7:11: error: 'Atcoder' was not declared in this scope
    7 |   cout << Atcoder c Contest
      |           ^~~~~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: expected ';' before 'cout'
    7 |     cout << a.at(0)
      |                    ^
      |                    ;
    8 |     cout << s.at(0);
      |     ~~~~
Language: C++

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

int main() {
  string a,b,x;
  char x;
  cin >>a>>x>>b;
  cout << 'A' << x << 'B' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: conflicting declaration 'char x'
    6 |   char x;
      |        ^
a.cc:5:14: note: previous declaration as 'std::string x'
    5 |   string a,b,x;
      |              ^
Language: C++

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

int main() {
  string a,b,x;
  cin >>a>>x>>b;
  cout << 'A' << x << 'B' << endl;
  


Compiler output:
a.cc: In function 'int main()':
a.cc:7:35: error: expected '}' at end of input
    7 |   cout << 'A' << x << 'B' << endl;
      |                                   ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main() {
    string str;
    getline(cin, str)
    cout << "A" << str.at(8) << "C";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:22: error: expected ';' before 'cout'
    6 |     getline(cin, str)
      |                      ^
      |                      ;
    7 |     cout << "A" << str.at(8) << "C";
      |     ~~~~
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define rep(i, begin, end) for (__typeof(end) i = (begin) - ((begin) > (end)); i != (end) - ((begin) > (end)); i += 1 - 2 * ((begin) > (end))) // rep(i, 1, 5) --> {1,2,3,4} // rep(i, 5, 1) --> {4,3,2,1} // rep(it, end(v), begin(v)) --> *it

using namespace std;

int main()
{
    string a, b, c;
    cin >> a >> b >> c;
    cout << "A"+b[0]+"C";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:21: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   11 |     cout << "A"+b[0]+"C";
      |                     ^~~~
      |                      |
      |                      const char [2]
Language: C++

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

int main() {
  string X;
  cin >> X;

  cout << "A", X.at(9), "B" << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:29: error: invalid operands of types 'const char [2]' and '<unresolved overloaded function type>' to binary 'operator<<'
    8 |   cout << "A", X.at(9), "B" << endl;
      |                         ~~~~^~~~~~~
Language: C++

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

int main() {
  string X;
  cin >> X;

  cout << "A", X.at(8), "B" << endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:29: error: invalid operands of types 'const char [2]' and '<unresolved overloaded function type>' to binary 'operator<<'
    8 |   cout << "A", X.at(8), "B" << endl;
      |                         ~~~~^~~~~~~
Language: Java

import java.util.Scanner;

public class main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);

        String[] str1 = scanner.nextLine().split(" ");
        for (String s : str1) {
            System.out.print(s.substring(0, 1));
        }

        scanner.close();
    }
}


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

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

int main() {
  for (string s; cin >> s;) cout << s.at(0)
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:44: error: expected ';' before '}' token
    5 |   for (string s; cin >> s;) cout << s.at(0)
      |                                            ^
      |                                            ;
    6 | }
      | ~
Language: C++

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

int main() {
  string s;
  getline(cin, s);
  cout << "A" + s.at(8) + "C"<< endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    7 |   cout << "A" + s.at(8) + "C"<< endl;
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]