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

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

int main() {
  str a;
  cin >> a;
  x = a.at(7);
  cout << A + x + C << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'str' was not declared in this scope; did you mean 'std'?
    5 |   str a;
      |   ^~~
      |   std
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a;
      |          ^
a.cc:7:3: error: 'x' was not declared in this scope
    7 |   x = a.at(7);
      |   ^
a.cc:8:11: error: 'A' was not declared in this scope
    8 |   cout << A + x + C << endl;
      |           ^
a.cc:8:19: error: 'C' was not declared in this scope
    8 |   cout << A + x + C << endl;
      |                   ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int i = 0; i < n; i++)
int main(){ 
    string s;
    cin>>s;
    cout<<'A'<<s[0]<<'C'
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: expected ';' before 'return'
    7 |     cout<<'A'<<s[0]<<'C'
      |                         ^
      |                         ;
    8 |     return 0;
      |     ~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string C;
  cin >> C;
 
  char c = C.at(8);
  
  cout << "A" + c + "C" <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |   cout << "A" + c + "C" <<endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |   cout << "A" + c + "C" <<endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

#include <iostream>
using namespace std;
#include <bits/stdc++.h>
#include<cstring>
#include<cmath>
#include<cstdio>
#include<string>
#include<string.h>
#include<stdio.h>
#include <vector>
#include <map>


int main()
{
   long long int a,b,x;
   cin >> a >> b >> x;
   if(a%x == 0)
   {
     cout << (b/c - a/c) +1;

   }
   else
   {
       cout << (b/c - a/c) << endl;
   }



}



Compiler output:
a.cc: In function 'int main()':
a.cc:20:17: error: 'c' was not declared in this scope
   20 |      cout << (b/c - a/c) +1;
      |                 ^
a.cc:25:19: error: 'c' was not declared in this scope
   25 |        cout << (b/c - a/c) << endl;
      |                   ^
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(ll i = 0; i < (ll)n; i++)
#define FOR(i, a, b) for(ll i = (a); i < (ll)b; i++)
#define ALL(obj) (obj).begin(), (obj).end()
#define INF (1ll << 60)
#define sz(x) int(x.size())
using namespace std;
typedef long long ll;
using vl = vector<ll>;
using vvl = vector<vl>;
typedef double db;
typedef string str;
typedef pair<ll, ll> p;
constexpr int MOD = 1000000007;
using ll = long long;
template <class T> inline bool chmin(T &a, T b) {
    if(a > b) {
        a = b;
        return true;
    }
    return false;
}
template <class T> inline bool chmax(T &a, T b) {
    if(a < b) {
        a = b;
        return true;
    }
    return false;
}

void print(const std::vector<int> &v) {
    std::for_each(v.begin(), v.end(), [](int x) { std::cout << x << " "; });
    std::cout << std::endl;
}

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

Compiler output:
a.cc: In function 'int main()':
a.cc:42:13: error: expected ';' before '}' token
   42 |     return 0
      |             ^
      |             ;
   43 | }
      | ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  char S1[], S2[], S3[];
  cin >> S1 >> S2 >> S3;
  cout << 'A' + S2[0] + 'C' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: storage size of 'S1' isn't known
    6 |   char S1[], S2[], S3[];
      |        ^~
a.cc:6:14: error: storage size of 'S2' isn't known
    6 |   char S1[], S2[], S3[];
      |              ^~
a.cc:6:20: error: storage size of 'S3' isn't known
    6 |   char S1[], S2[], S3[];
      |                    ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  char S1[10], S2[111], S3[10];
  cin >> S1[] >> S2[] >> S3[];
  cout << 'A' + S2[0] + 'C' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |             ^
a.cc:7:21: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |                     ^
a.cc:7:29: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |                             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  char S1[], S2[], S3[];
  cin >> S1[] >> S2[] >> S3[];
  cout << 'A' + S2[0] + 'C' << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:8: error: storage size of 'S1' isn't known
    6 |   char S1[], S2[], S3[];
      |        ^~
a.cc:6:14: error: storage size of 'S2' isn't known
    6 |   char S1[], S2[], S3[];
      |              ^~
a.cc:6:20: error: storage size of 'S3' isn't known
    6 |   char S1[], S2[], S3[];
      |                    ^~
a.cc:7:13: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |             ^
a.cc:7:21: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |                     ^
a.cc:7:29: error: expected primary-expression before ']' token
    7 |   cin >> S1[] >> S2[] >> S3[];
      |                             ^
Language: C

#include <iostream>
using namespace std;
 
int main()
{
  string S1, S2, S3;
  cin >> S1 >> S2 >> S3;
  cout << 'A'+S2.at(0)+'C' << endl;
}

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

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

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

#include <bits/stdc++.h>
using namespace std;
 
int main()
{
  String S1, S2, S3;
  cin >> S1 >> S2 >> S3;
  cout << S1.at(0)+S2.at(0)+S3.at(0) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'String' was not declared in this scope
    6 |   String S1, S2, S3;
      |   ^~~~~~
a.cc:7:10: error: 'S1' was not declared in this scope; did you mean 'y1'?
    7 |   cin >> S1 >> S2 >> S3;
      |          ^~
      |          y1
a.cc:7:16: error: 'S2' was not declared in this scope
    7 |   cin >> S1 >> S2 >> S3;
      |                ^~
a.cc:7:22: error: 'S3' was not declared in this scope
    7 |   cin >> S1 >> S2 >> S3;
      |                      ^~
Language: Java

import java.util.*;

class Main {
public static void main(String[] args){

Scanner sc = new Scanner(System.in);
String a = sc.next();
String b = sc.next();
String c = sc.next();
a = a.charAt(1);
b = b.charAt(1);
c = c.charAt(1);
System.out.println(a + b + c);

}
}

Compiler output:
Main.java:10: error: incompatible types: char cannot be converted to String
a = a.charAt(1);
            ^
Main.java:11: error: incompatible types: char cannot be converted to String
b = b.charAt(1);
            ^
Main.java:12: error: incompatible types: char cannot be converted to String
c = c.charAt(1);
            ^
3 errors
Language: C

#include <stdio.h>

int main(void) {
	char *ac, string, contest;
	scanf("%s %s %s", &ac, &string, &contest);
	printf("A%cC", string[0]);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:30: error: subscripted value is neither array nor pointer nor vector
    6 |         printf("A%cC", string[0]);
      |                              ^
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:7:11: error: 'at' was not declared in this scope; did you mean 'a'?
    7 |   cout<<a,at(0) << b.at(0) <<c.at(0) <<endl;
      |           ^~
      |           a
Language: Java

import java.util.*;
public class Main {
    public static void main(String[] args) {
      Scanner scan = new Scanner(System.in);
      String str[] = new String[3];
      for (int i=0;i<3;i++){
        str[i]=scan.next();
        str[i]=substring(0,1);
      }
      System.out.println(str[0]+str[1]+str[2]);
    }
}

Compiler output:
Main.java:8: error: cannot find symbol
        str[i]=substring(0,1);
               ^
  symbol:   method substring(int,int)
  location: class Main
1 error
Language: C

#include <stdio.h>

int main(){
  char s[], a = 'A', c = 'C';
  scanf("%s", s);
  printf("A%cC", s[0]);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:8: error: array size missing in 's'
    4 |   char s[], a = 'A', c = 'C';
      |        ^
Language: C

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

int main(){
  char s[100], *x, *y, a = 'A', c = 'C';
  scanf("%s", s);
  x = strcat(a, a[0]);
  y = strcat(x, c);
  printf("%s", y);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:18: error: subscripted value is neither array nor pointer nor vector
    7 |   x = strcat(a, a[0]);
      |                  ^
main.c:7:14: error: passing argument 1 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    7 |   x = strcat(a, a[0]);
      |              ^
      |              |
      |              char
In file included from main.c:2:
/usr/include/string.h:149:39: note: expected 'char * restrict' but argument is of type 'char'
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |                      ~~~~~~~~~~~~~~~~~^~~~~~
main.c:8:17: error: passing argument 2 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    8 |   y = strcat(x, c);
      |                 ^
      |                 |
      |                 char
/usr/include/string.h:149:70: note: expected 'const char * restrict' but argument is of type 'char'
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |                                               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
Language: C

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

int main(){
  char s[100], *x, *y a = 'A', c = 'C';
  scanf("%s", s);
  x = strcat(a, a[0]);
  y = strcat(x, c);
  printf("%s", y);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:23: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'a'
    5 |   char s[100], *x, *y a = 'A', c = 'C';
      |                       ^
main.c:7:14: error: 'a' undeclared (first use in this function)
    7 |   x = strcat(a, a[0]);
      |              ^
main.c:7:14: note: each undeclared identifier is reported only once for each function it appears in
main.c:8:3: error: 'y' undeclared (first use in this function)
    8 |   y = strcat(x, c);
      |   ^
main.c:8:17: error: 'c' undeclared (first use in this function)
    8 |   y = strcat(x, c);
      |                 ^
Language: C

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

int main(){
  char s[100], *x, a = 'A', c = 'C';
  scanf("%s", s);
  x = strcat(a. a[0], c);
  printf("%s", x);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:15: error: request for member 'a' in something not a structure or union
    7 |   x = strcat(a. a[0], c);
      |               ^
main.c:7:23: error: passing argument 2 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    7 |   x = strcat(a. a[0], c);
      |                       ^
      |                       |
      |                       char
In file included from main.c:2:
/usr/include/string.h:149:70: note: expected 'const char * restrict' but argument is of type 'char'
  149 | extern char *strcat (char *__restrict __dest, const char *__restrict __src)
      |                                               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
Language: C

#include <stdio.h>

int main(){
  char s[100], *x, a = 'A', c = 'C';
  scanf("%s", s);
  x = strcat(a. a[0], c);
  printf("%s", x);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:7: error: implicit declaration of function 'strcat' [-Wimplicit-function-declaration]
    6 |   x = strcat(a. a[0], c);
      |       ^~~~~~
main.c:2:1: note: include '<string.h>' or provide a declaration of 'strcat'
    1 | #include <stdio.h>
  +++ |+#include <string.h>
    2 | 
main.c:6:7: warning: incompatible implicit declaration of built-in function 'strcat' [-Wbuiltin-declaration-mismatch]
    6 |   x = strcat(a. a[0], c);
      |       ^~~~~~
main.c:6:7: note: include '<string.h>' or provide a declaration of 'strcat'
main.c:6:15: error: request for member 'a' in something not a structure or union
    6 |   x = strcat(a. a[0], c);
      |               ^
main.c:6:23: error: passing argument 2 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    6 |   x = strcat(a. a[0], c);
      |                       ^
      |                       |
      |                       char
main.c:6:23: note: expected 'const char *' but argument is of type 'char'
Language: C

#include <stdio.h>

int main(){
  char s[100], *x, a = "A", c = "C";
  scanf("%s", s);
  x = strcat(a. a[0], c);
  printf("%s", x);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:24: error: initialization of 'char' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
    4 |   char s[100], *x, a = "A", c = "C";
      |                        ^~~
main.c:4:33: error: initialization of 'char' from 'char *' makes integer from pointer without a cast [-Wint-conversion]
    4 |   char s[100], *x, a = "A", c = "C";
      |                                 ^~~
main.c:6:7: error: implicit declaration of function 'strcat' [-Wimplicit-function-declaration]
    6 |   x = strcat(a. a[0], c);
      |       ^~~~~~
main.c:2:1: note: include '<string.h>' or provide a declaration of 'strcat'
    1 | #include <stdio.h>
  +++ |+#include <string.h>
    2 | 
main.c:6:7: warning: incompatible implicit declaration of built-in function 'strcat' [-Wbuiltin-declaration-mismatch]
    6 |   x = strcat(a. a[0], c);
      |       ^~~~~~
main.c:6:7: note: include '<string.h>' or provide a declaration of 'strcat'
main.c:6:15: error: request for member 'a' in something not a structure or union
    6 |   x = strcat(a. a[0], c);
      |               ^
main.c:6:23: error: passing argument 2 of 'strcat' makes pointer from integer without a cast [-Wint-conversion]
    6 |   x = strcat(a. a[0], c);
      |                       ^
      |                       |
      |                       char
main.c:6:23: note: expected 'const char *' but argument is of type 'char'
Language: C

#include <stdio.h>

int main(){
  char s[100], x;
  scanf("%s", s);
  x = s[0];
  printf("A" + "%c" + "C", s[0]);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:14: error: invalid operands to binary + (have 'char *' and 'char *')
    7 |   printf("A" + "%c" + "C", s[0]);
      |          ~~~ ^
      |          |   |
      |          |   char *
      |          char *
Language: C

#include <stdio.h>

int main(){
  char s[100];
  scanf("%s", s);
  
  printf("A" + "%s" + "C", s[0]);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:14: error: invalid operands to binary + (have 'char *' and 'char *')
    7 |   printf("A" + "%s" + "C", s[0]);
      |          ~~~ ^
      |          |   |
      |          |   char *
      |          char *
Language: C

#include <stdio.h>

int main(){
  char s[100];
  scanf("%s", s);
  
  printf("A" + %s + "C", s[0]);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:16: error: expected expression before '%' token
    7 |   printf("A" + %s + "C", s[0]);
      |                ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
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:6:23: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    6 |     cout <<"A"+b.at(0)+"C"<<endl;
      |            ~~~~~~~~~~~^~~~
      |               |        |
      |               |        const char [2]
      |               const char*
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main(){
 int = a, b,c;
  cin >> a >> b >> c;
  
  if((a != 0) &&(a%c ==0) && (b%c == 0)){
    cout << (b-a)/c +1 <<endl;
  }
  else if((a != 0) &&(a%c ==0) && (b%c != 0)){
  cout << (b-a)/c+1 <<endl;
  }
    else if((a != 0) &&(a%c !=0) && (b%c == 0)){
      cout <<(b-a)/c+1 << endl;
    }
  else if ((a != 0) &&(a%c !=0) && (b%c != 0)){
    cout <<(b-a)/c <<endl;
  }
  else if ((a == 0) &&(b%c ==0)){
    cout << (b/c) <<endl;
  }
    else if ((a==0)&&(b%c != 0)){
  cout << (b/c) <<endl;
    }
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:6: error: expected unqualified-id before '=' token
    7 |  int = a, b,c;
      |      ^
a.cc:8:10: error: 'a' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |          ^
a.cc:8:15: error: 'b' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |               ^
a.cc:8:20: error: 'c' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |                    ^
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main(){
 long long int = a, b,c;
  cin >> a >> b >> c;
  
  if((a != 0) &&(a%c ==0) && (b%c == 0)){
    cout << (b-a)/c +1 <<endl;
  }
  else if((a != 0) &&(a%c ==0) && (b%c != 0)){
  cout << (b-a)/c+1 <<endl;
  }
    else if((a != 0) &&(a%c !=0) && (b%c == 0)){
      cout <<(b-a)/c+1 << endl;
    }
  else if ((a != 0) &&(a%c !=0) && (b%c != 0)){
    cout <<(b-a)/c <<endl;
  }
  else if ((a == 0) &&(b%c ==0)){
    cout << (b/c) <<endl;
  }
    else if ((a==0)&&(b%c != 0)){
  cout << (b/c) <<endl;
    }
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:16: error: expected unqualified-id before '=' token
    7 |  long long int = a, b,c;
      |                ^
a.cc:8:10: error: 'a' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |          ^
a.cc:8:15: error: 'b' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |               ^
a.cc:8:20: error: 'c' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |                    ^
Language: C++

#include <iostream>
#include <vector>

using namespace std;

int main(){
  int64_t = a, b,c;
  cin >> a >> b >> c;
  
  if((a != 0) &&(a%c ==0) && (b%c == 0)){
    cout << (b-a)/c +1 <<endl;
  }
  else if((a != 0) &&(a%c ==0) && (b%c != 0)){
  cout << (b-a)/c+1 <<endl;
  }
    else if((a != 0) &&(a%c !=0) && (b%c == 0)){
      cout <<(b-a)/c+1 << endl;
    }
  else if ((a != 0) &&(a%c !=0) && (b%c != 0)){
    cout <<(b-a)/c <<endl;
  }
  else if ((a == 0) &&(b%c ==0)){
    cout << (b/c) <<endl;
  }
    else if ((a==0)&&(b%C != 0)){
  cout << (b/c) <<endl;
    }
    
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:11: error: expected unqualified-id before '=' token
    7 |   int64_t = a, b,c;
      |           ^
a.cc:8:10: error: 'a' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |          ^
a.cc:8:15: error: 'b' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |               ^
a.cc:8:20: error: 'c' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |                    ^
a.cc:25:25: error: 'C' was not declared in this scope
   25 |     else if ((a==0)&&(b%C != 0)){
      |                         ^
Language: C++

#include <isotream>
#include <vector>

using namespace std;

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


}

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

import java.util.*;
import java.math.BigInteger;
  class Main{
    public static void main(String args[]){
      Scanner sc = new Scanner(System.in);
  
      long a = sc.nextInt();
      long b = sc.nextInt();
      long x = sc.nextInt();
      long count = 0;
      
      System.out.println(f(b,x) - f(a-1,x));
  }
    
    
    public static long f(long n,long d){
      if(n == -1){
        return 0;
      }else{
        return f2(n,d);
      }
    }
    
    public static long f2(long n, long d){
       for(long i=1;i<=n;i++){
        if(i%d == 0){
          count += 1;
        }
      }
      return count;
    }
      
}

Compiler output:
Main.java:27: error: cannot find symbol
          count += 1;
          ^
  symbol:   variable count
  location: class Main
Main.java:30: error: cannot find symbol
      return count;
             ^
  symbol:   variable count
  location: class Main
2 errors
Language: C++

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

using namespace std;

int main()
{string a="ATCoder";
string b="Contest";
    string X;
    cin>>X;
    cout<<a[0]<<X[0]<<b[0];

    return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:13:14: error: expected '}' at end of input
   13 |     return 0;
      |              ^
a.cc:7:1: note: to match this '{'
    7 | {string a="ATCoder";
      | ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: expected ';' before 'cout'
    8 |   x = S.at(8)
      |              ^
      |              ;
    9 |   cout << 'A' + x + 'C' ;
      |   ~~~~
Language: C++

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

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


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" + x.at(0) + "C";
      |           ~~~~~~~~~~~~~ ^ ~~~
      |               |           |
      |               const char* const char [2]
Language: C++

#include<iostream>
using namespace std ;

int main()
{
  string S ;
  getline(cin,S) ;
  .
  cout<<"A"<<S.at(9)<<"C"<<endl ;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected primary-expression before '.' token
    8 |   .
      |   ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string s1,s2,s3;
  cin >> s1 >> s2 >> s3;
  cout << 'A' << s2.at(0) << 'C' << endl;
]

Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: expected primary-expression before ']' token
    7 | ]
      | ^
a.cc:7:2: error: expected '}' at end of input
    7 | ]
      |  ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<bits/stdc++.h>
string a;
int main(){
cin>>a>>a;
cout<<'A'<<a[0]<<'C'<<endl;
}

Compiler output:
a.cc:2:1: error: 'string' does not name a type; did you mean 'stdin'?
    2 | string a;
      | ^~~~~~
      | stdin
a.cc: In function 'int main()':
a.cc:4:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    4 | cin>>a>>a;
      | ^~~
      | std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:4:6: error: 'a' was not declared in this scope
    4 | cin>>a>>a;
      |      ^
a.cc:5:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    5 | cout<<'A'<<a[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:5:23: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 | cout<<'A'<<a[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(){
  vector<string> x(3);
  cin >> x.at(0) >> x.at(1) >> x.at(2);
  string str=x.at(1);
  
  cout <<"A"<< str.at(0);<<"C" << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:26: error: expected primary-expression before '<<' token
    9 |   cout <<"A"<< str.at(0);<<"C" << endl;
      |                          ^~
Language: C++

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

int main(){

string = A,x,B;

cin >> A >> x >> B;

cout << A+x+B<< endl;
cout << A +x.at(0) + B << endl;
}

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

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

int main(){

string = A,x,B;

cin >> A >> x >> B;

cout << A+x+B<< endl;
cout << A +x.at(0) + B << endl;

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

#include<iostream>
#include <string>
#include <algorithm>
using namespace std;
int main(){
  string A, X, C;
  cin >> A >> X >> C;
  transform(X[0], X[1], X[0], ::toupper);
  cout << A[0] << X[0] << C[0] << endl;
  return 0;
}

Compiler output:
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h: In instantiation of '_OIter std::transform(_IIter, _IIter, _OIter, _UnaryOperation) [with _IIter = char; _OIter = char; _UnaryOperation = int (*)(int) noexcept]':
a.cc:8:12:   required from here
    8 |   transform(X[0], X[1], X[0], ::toupper);
      |   ~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4220:9: error: invalid type argument of unary '*' (have 'char')
 4220 |         *__result = __unary_op(*__first);
      |         ^~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:4220:32: error: invalid type argument of unary '*' (have 'char')
 4220 |         *__result = __unary_op(*__first);
      |                                ^~~~~~~~
Language: C++

#include<iostream>
using namespace std;
int main(){
  string A, X, C;
  cin >> A >> X >> C;
  transform(X[0], X[1], X[0], ::toupper);
  cout << A[0] << X[0] << C[0] << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'transform' was not declared in this scope
    6 |   transform(X[0], X[1], X[0], ::toupper);
      |   ^~~~~~~~~
Language: C++

#include<iostreram>
using namespace std;
int main(){
  string A, X, C;
  cin >> A >> X >> C;
  transform(X[0], X[1], X[0], ::toupper);
  cout << A[0] << X[0] << C[0] << endl;
  return 0;
}

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

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

int main(){

  stirng a,b,c;
  cin >> a >> b >> c;
  
  cout << a[0]+b[0]+c[0] << endl;
    
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'stirng' was not declared in this scope
    7 |   stirng a,b,c;
      |   ^~~~~~
a.cc:8:10: error: 'a' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |          ^
a.cc:8:15: error: 'b' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |               ^
a.cc:8:20: error: 'c' was not declared in this scope
    8 |   cin >> a >> b >> c;
      |                    ^
Language: C++

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

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

  // ここにプログラムを追記
 cout << A << S.at(0) << C << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: 'A' was not declared in this scope
    9 |  cout << A << S.at(0) << C << endl;
      |          ^
a.cc:9:26: error: 'C' was not declared in this scope
    9 |  cout << A << S.at(0) << C << endl;
      |                          ^
Language: C++

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

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

    cout << A << S.at(0) << C << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: 'A' was not declared in this scope
    8 |     cout << A << S.at(0) << C << endl;
      |             ^
a.cc:8:29: error: 'C' was not declared in this scope
    8 |     cout << A << S.at(0) << C << endl;
      |                             ^
Language: C++

#include<iostream>
using namespace std;
int main(void){
  
  string s[];

  for(int i = 0; i < 3; i++){
    cin >> s[i];
  }

  for(int i = 0; i < 3; i++){
    cout << s[i][0];
  }

  cout << endl;

  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:10: error: array size missing in 's'
    5 |   string s[];
      |          ^
Language: C++

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

int main() {
  string a,b,c;
  cin >> a >> b >> c;); // 変数sで入力を一行受け取る
 
   cout << a.at(0) << b.at(0) << c.at(0) << endl; 
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:22: error: expected primary-expression before ')' token
    6 |   cin >> a >> b >> c;); // 変数sで入力を一行受け取る
      |                      ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:41: error: expected ';' before '}' token
    7 |   cout  << A.at(0) << X.at(0) << C.at(0)
      |                                         ^
      |                                         ;
    8 | }
      | ~
Language: Java

	public static void main(String[] args) {
		InputReader in = new StreamInputReader(System.in);
		PrintWriter out = new PrintWriter(System.out);
		run(in, out);
	}
 
	public static void run(InputReader in, PrintWriter out) {
		Solver solver = new TaskC();
		solver.solve(1, in, out);
		Exit.exit(in, out);
	}
}

Compiler output:
Main.java:1: error: unnamed classes are a preview feature and are disabled by default.
	public static void main(String[] args) {
	              ^
  (use --enable-preview to enable unnamed classes)
Main.java:12: error: class, interface, enum, or record expected
}
^
2 errors
Language: Java

import java.util.Scanner;

    public static void main(String[] args) {
       Scanner x=new Scanner(System.in);
       String s,s2,s3;
       s=x.next();
       s2=x.next();
       s3=x.next(); 
       System.out.printf("%s%s%s\n", s.charAt(0),s2.charAt(0),s3.charAt(0));
    }

Compiler output:
Main.java:3: error: unnamed classes are a preview feature and are disabled by default.
    public static void main(String[] args) {
                  ^
  (use --enable-preview to enable unnamed classes)
1 error
Language: Java

import java.util.Scanner;
public class JavaApplication7 {
    public static void main(String[] args) {
       Scanner x=new Scanner(System.in);
       String s,s2,s3;
       s=x.next();
       s2=x.next();
       s3=x.next(); 
       System.out.printf("%s%s%s\n", s.charAt(0),s2.charAt(0),s3.charAt(0));
    }
    
}


Compiler output:
Main.java:2: error: class JavaApplication7 is public, should be declared in a file named JavaApplication7.java
public class JavaApplication7 {
       ^
1 error
Language: Java

package javaapplication7;
import java.util.Scanner;
public class JavaApplication7 {
    public static void main(String[] args) {
       Scanner x=new Scanner(System.in);
       String s,s2,s3;
       s=x.next();
       s2=x.next();
       s3=x.next(); 
       System.out.printf("%s%s%s\n", s.charAt(0),s2.charAt(0),s3.charAt(0));
    }
    
}


Compiler output:
Main.java:3: error: class JavaApplication7 is public, should be declared in a file named JavaApplication7.java
public class JavaApplication7 {
       ^
1 error
Language: Java

package m;
import java.util.Scanner;
public class m{
    public static void main(String[] args) 
    {
        Scanner x =new Scanner(System.in);
        String s,s2,s3,c,z,v;
        s=x.next();
        s2=x.next();
        s3=x.next();
        c=s.toUpperCase();
        z=s2.toUpperCase();
        v=s3.toUpperCase();
        System.out.printf("%s%s%s\n",c.charAt(0),z.charAt(0),v.charAt(0));
    }
}


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

import java.util.Scanner;
public class m {
    public static void main(String[] args) 
    {
        Scanner x =new Scanner(System.in);
        String s,s2,s3,c,z,v;
        s=x.next();
        s2=x.next();
        s3=x.next();
        c=s.toUpperCase();
        z=s2.toUpperCase();
        v=s3.toUpperCase();
        System.out.printf("%s%s%s\n",c.charAt(0),z.charAt(0),v.charAt(0));
    }
}

Compiler output:
Main.java:2: error: class m is public, should be declared in a file named m.java
public class m {
       ^
1 error
Language: Java

import java.util.Scanner;
public class JavaApplication4 {
    public static void main(String[] args) 
    {
        Scanner x =new Scanner(System.in);
        String s,s2,s3,c,z,v;
        s=x.next();
        s2=x.next();
        s3=x.next();
        c=s.toUpperCase();
        z=s2.toUpperCase();
        v=s3.toUpperCase();
        System.out.printf("%s%s%s\n",c.charAt(0),z.charAt(0),v.charAt(0));
    }
}

Compiler output:
Main.java:2: error: class JavaApplication4 is public, should be declared in a file named JavaApplication4.java
public class JavaApplication4 {
       ^
1 error
Language: Java

package javaapplication4;
import java.util.Scanner;
public class JavaApplication4 {
    public static void main(String[] args) 
    {
        Scanner x =new Scanner(System.in);
        String s,s2,s3,c,z,v;
        s=x.next();
        s2=x.next();
        s3=x.next();
        c=s.toUpperCase();
        z=s2.toUpperCase();
        v=s3.toUpperCase();
        System.out.printf("%s%s%s\n",c.charAt(0),z.charAt(0),v.charAt(0));
    }
}


Compiler output:
Main.java:3: error: class JavaApplication4 is public, should be declared in a file named JavaApplication4.java
public class JavaApplication4 {
       ^
1 error
Language: Java

package javaapplication4;
import java.util.Scanner;
public class JavaApplication4 {
    public static void main(String[] args) 
    {
        Scanner x =new Scanner(System.in);
        String s,s2,s3;
        s=x.next();
        s2=x.next();
        s3=x.next();
        System.out.printf("%s%s%s\n",s.charAt(0),s2.charAt(0),s3.charAt(0));
    }
}


Compiler output:
Main.java:3: error: class JavaApplication4 is public, should be declared in a file named JavaApplication4.java
public class JavaApplication4 {
       ^
1 error
Language: C++

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

int main() {
  int N = 3
  for(int i = 0; i < N; i++ ){
  string s;
  cin >> s;
    if (i = 1){
  char x = s.at(0);
  cout << 'A' << x <<  'C' << endl;
    }
  }

}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: expected ',' or ';' before 'for'
    6 |   for(int i = 0; i < N; i++ ){
      |   ^~~
a.cc:6:18: error: 'i' was not declared in this scope
    6 |   for(int i = 0; i < N; i++ ){
      |                  ^
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: 'A' was not declared in this scope
    6 |     cout<<A<<b[0]<<C<<endl;
      |           ^
a.cc:6:20: error: 'C' was not declared in this scope
    6 |     cout<<A<<b[0]<<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)
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:35: error: expected ';' before '}' token
    7 |   cout <<a.at(0)<<b.at(0)<<c.at(0)
      |                                   ^
      |                                   ;
    8 | }
      | ~
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:8:29: error: 'C' was not declared in this scope
    8 |   cout << 'A' << S.at(8) << C <<endl;
      |                             ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:18: error: expected ';' before 's'
    6 |   cout << a.at(0) s.at(0) c.at(0) << endl;
      |                  ^~
      |                  ;
Language: Java

import java.io.*;
import java.util.*;
public class Candies{
	public static int numOfOperations(int[] candies, int maxCount){
		int excessCandies;
		int opCost = 0;
		for (int i = 0; i < candies.length - 1; i ++){
			excessCandies = candies[i] + candies[i + 1] - maxCount;
			if (excessCandies <= 0)
				continue;
			else{
				opCost += excessCandies;
				if (excessCandies < candies[i + 1]){
					candies[i + 1] -= excessCandies;
				}
				else{
					candies[i] -= excessCandies - candies[i + 1];	
					candies[i + 1] = 0;
				}
			}
		}
		return opCost;
	}
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int numOfBoxes = sc.nextInt();
		int maxCount = sc.nextInt();
		sc.nextLine();
		String[] arr = sc.nextLine().split(" ");
		int[] candies = new int[arr.length];
		for (int i = 0; i < arr.length; i ++){
			candies[i] = Integer.parseInt(arr[i]);
		}
		System.out.println(numOfOperations(candies, maxCount));
	}
}

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

#include<bits/stdc++.h>

int main() {
  	int n;
  	int x;
  	cin >> n;
  	cin >> x;
  	int arr[n];
  	for (int i = 0; i < n; i++) {
    	cin >> arr[i];
    }    
  	int answer = 0;
  	for (int i = 0; i < n; i++) {
    	if (arr[i] > x) {
        	answer = answer + (arr[i] - x);
        }
    }
  	for (int i = 0; i < n - 1; i++) {
    	if (arr[i] + arr[i + 1] > x) {
        	answer = answer + ((x - arr[i]) < 0 ? arr[i + 1] + arr[i] - x : arr[i] + arr[i + 1] - x);
          	arr[i + 1] = x - arr[i] < 0 ? 0 : arr[i + 1] - x; 
          	if (arr[i + 1] == 0) {
            	arr[i] = x;
            }
        }
    }
  	cout << answer << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |         cin >> n;
      |         ^~~
      |         std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:27:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   27 |         cout << answer << 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:27:27: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   27 |         cout << answer << 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>
# define ll long long
using namespace std;
 
int main(){
  ll n,x;
  cin >> n >> x;
  ll a[n];
  ll sum;ll ans;
  for ( int i = 0 ; i < n ;i++){
  cin >> a[i];
  }
  if ( a[0] > x ) {
		ans += a[0] - x;
		a[0] = x;
	}
	sum = a[0];
	for ( int i = 1 ; i < n ; i++){
		sum += a[i];
		if (sum > x){
			ans += sum-x;
			a[i] -= sum-x;
			sum = x;
		}
		sum -= a[i-1];
	}
	cout << ans;
}
  
}

Compiler output:
a.cc:30:1: error: expected declaration before '}' token
   30 | }
      | ^
Language: C++

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

int main() {
  string a,b,c;

 cin >> a >> b >> c;
 
  char d == b.at(0);

  cout << 'A' +d + 'C' << endl;
} 




Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: expected initializer before '==' token
    9 |   char d == b.at(0);
      |          ^~
a.cc:11:16: error: 'd' was not declared in this scope
   11 |   cout << 'A' +d + 'C' << endl;
      |                ^
Language: C++

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

int main() {
  string a,b,c;

 cin >> a >>b >> c;
 
  char d == b.at(0);

  cout << 'A' << d << 'C' << endl;
} 




Compiler output:
a.cc: In function 'int main()':
a.cc:9:10: error: expected initializer before '==' token
    9 |   char d == b.at(0);
      |          ^~
a.cc:11:18: error: 'd' was not declared in this scope
   11 |   cout << 'A' << d << 'C' << endl;
      |                  ^
Language: Java

import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner sc = new Scanner(System.in);
      String s = sc.nextInt();
      String x = s.substring(0,1).toUpperCase();
      System.out.println("A"+x+"C");
    }
}

Compiler output:
Main.java:5: error: incompatible types: int cannot be converted to String
      String s = sc.nextInt();
                           ^
1 error
Language: C++

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

int main(void) {
string a,b.c;
cin >> a >> b >> c;
cout << a[0] << b[0]  <<c[0]  << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:11: error: expected initializer before '.' token
    5 | string a,b.c;
      |           ^
a.cc:6:13: error: 'b' was not declared in this scope
    6 | cin >> a >> b >> c;
      |             ^
a.cc:6:18: 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 << b.at(0) <<c;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'String' was not declared in this scope
    5 |   String a,b,c;
      |   ^~~~~~
a.cc:6:10: error: 'a' was not declared in this scope
    6 |   cin >> a>>b>>c;
      |          ^
a.cc:6:13: error: 'b' was not declared in this scope
    6 |   cin >> a>>b>>c;
      |             ^
a.cc:6:16: 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 s ;
  
  cin >> s;

  cout << "A" << str.at(0) << "C"<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:18: error: 'str' was not declared in this scope; did you mean 'std'?
    9 |   cout << "A" << str.at(0) << "C"<< endl;
      |                  ^~~
      |                  std
Language: C++

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

  char s = str.at(0);

  cout << "A" <<  s << "C"<< endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:8: error: conflicting declaration 'char s'
    9 |   char s = str.at(0);
      |        ^
a.cc:5:10: note: previous declaration as 'std::string s'
    5 |   string s ;
      |          ^
a.cc:9:12: error: 'str' was not declared in this scope; did you mean 'std'?
    9 |   char s = str.at(0);
      |            ^~~
      |            std
Language: C++

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

  char s = str.at(0);

  cout << "A" <<  s << "C"<< endl;
}

Compiler output:
a.cc:5:1: error: extended character 　 is not valid in an identifier
    5 | 　string s ;
      | ^
a.cc: In function 'int main()':
a.cc:5:1: error: '\U00003000string' was not declared in this scope
    5 | 　string s ;
      | ^~~~~~~~
a.cc:7:10: error: 's' was not declared in this scope
    7 |   cin >> s;
      |          ^
a.cc:9:12: error: 'str' was not declared in this scope; did you mean 'std'?
    9 |   char s = str.at(0);
      |            ^~~
      |            std
Language: C++

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

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



Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A" + x + "C" << endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
    9 |   cout << "A" + x + "C" << endl;
      |           ~~~~~~~ ^ ~~~
      |               |     |
      |               |     const char [2]
      |               const char*
Language: C++

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

int main() {
  string s;
  cin >> s;
  char x;
  x = s.at(0);

    cout << "A" + x + "C" << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:21: error: invalid operands of types 'const char*' and 'const char [2]' to binary 'operator+'
   10 |     cout << "A" + x + "C" << endl;
      |             ~~~~~~~ ^ ~~~
      |                 |     |
      |                 |     const char [2]
      |                 const char*
Language: C++

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

int main() {
  string s;
  cin >> s;
  string str1 = "0";
  str1 = s.at(1);
  cout << "A" << str << "C" <<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:18: error: 'str' was not declared in this scope; did you mean 'str1'?
    9 |   cout << "A" << str << "C" <<endl;
      |                  ^~~
      |                  str1
Language: C++

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

int main() {
  string s;
  cin >> s;
  string str"a";
  str = s.at(1);
  cout << "A" << str << "C" <<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: expected initializer before string constant
    7 |   string str"a";
      |             ^~~
a.cc:8:3: error: 'str' was not declared in this scope; did you mean 'std'?
    8 |   str = s.at(1);
      |   ^~~
      |   std
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:8:29: warning: missing terminating " character
    8 |   cout << "A" << s.at(0) << "C << endl;
      |                             ^
a.cc:8:29: error: missing terminating " character
    8 |   cout << "A" << s.at(0) << "C << endl;
      |                             ^~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:10:1: error: expected primary-expression before '}' token
   10 | }
      | ^