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

#include<stdio.h>
char a[105];
char b[105];

int main(){
      scanf(“%s”,a);
      scanf(“%s”,b);
      printf(“%s%s”,a,b);
      return 0;
}
    

Compiler output:
main.c: In function 'main':
main.c:6:13: error: stray '\342' in program
    6 |       scanf(<U+201C>%s<U+201D>,a);
      |             ^~~~~~~~
main.c:6:14: error: expected expression before '%' token
    6 |       scanf(“%s”,a);
      |              ^
main.c:6:16: error: stray '\342' in program
    6 |       scanf(<U+201C>%s<U+201D>,a);
      |                       ^~~~~~~~
main.c:7:13: error: stray '\342' in program
    7 |       scanf(<U+201C>%s<U+201D>,b);
      |             ^~~~~~~~
main.c:7:14: error: expected expression before '%' token
    7 |       scanf(“%s”,b);
      |              ^
main.c:7:16: error: stray '\342' in program
    7 |       scanf(<U+201C>%s<U+201D>,b);
      |                       ^~~~~~~~
main.c:8:14: error: stray '\342' in program
    8 |       printf(<U+201C>%s%s<U+201D>,a,b);
      |              ^~~~~~~~
main.c:8:15: error: expected expression before '%' token
    8 |       printf(“%s%s”,a,b);
      |               ^
main.c:8:19: error: stray '\342' in program
    8 |       printf(<U+201C>%s%s<U+201D>,a,b);
      |                          ^~~~~~~~
Language: C++

#include <iostream>
#include <string>
using namespace std;
 
int main()
{
    string::S, T;
    cin >> S >> T;
    cout << T + S << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:13: error: 'S' is not a member of 'std::string' {aka 'std::__cxx11::basic_string<char>'}
    7 |     string::S, T;
      |             ^
a.cc:7:16: error: 'T' was not declared in this scope
    7 |     string::S, T;
      |                ^
a.cc:8:12: error: 'S' was not declared in this scope
    8 |     cin >> S >> T;
      |            ^
Language: C++

#include <cstdio>
#include <iostream>
#include <algorithm>
#include <string>
#include <string.h>
using namespace std;

int main(){
    char s[110], t[110], ch, k = 0,i = 0, j = 0;
    char str[220];
    gets(str);
    int l = strlen(str);
    for(; str[k] != ' '; k++){
        s[i++] = str[k];
    }
    s[i] = '\0';
    k++;
    for(; k < l; k++){
        t[j++] = str[k];
    }
    t[j] = '\0';
    printf("%s", t);
    printf("%s", s);
    printf("\n");
    return 0;
}


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

#include <iostream>
#include <string>
using namespace std;
int main(){
string::S,T;
  cout<<"T"<<"S"<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'S' is not a member of 'std::string' {aka 'std::__cxx11::basic_string<char>'}
    5 | string::S,T;
      |         ^
a.cc:5:11: error: 'T' was not declared in this scope
    5 | string::S,T;
      |           ^
Language: C++

#include <iostream>

using namespace std;

int main()
{
    string a,b;
    cin>>a;
    cin>>b;
    cou<<b<<a;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'cou' was not declared in this scope
   10 |     cou<<b<<a;
      |     ^~~
Language: C++

#include <stdio.h>
#include<string.h>
using namespace std;
void main()
{
    char S[100],T[200];
    scanf("%s",S);
    scanf("%s",T);
    
    strcat(T,S);
    printf("%s",T);
    
    
}



Compiler output:
a.cc:4:1: error: '::main' must return 'int'
    4 | void main()
      | ^~~~
Language: Java

package test;

import java.util.Scanner;

public class main {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner=new Scanner(System.in);
		String s=scanner.nextLine();
		String t=scanner.nextLine();
		t=t+s;
		System.out.println(t);
	}

}


Compiler output:
Main.java:5: error: class main is public, should be declared in a file named main.java
public class main {
       ^
1 error
Language: Java

package test;

import java.util.Scanner;

public class main{

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner=new Scanner(System.in);
		String s=scanner.nextLine();
		String t=scanner.nextLine();
		t=t+s;
		System.out.println(t);
	}
}


Compiler output:
Main.java:5: error: class main is public, should be declared in a file named main.java
public class main{
       ^
1 error
Language: Java

package test;

import java.util.Scanner;

public class zzz {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Scanner scanner=new Scanner(System.in);
		String s=scanner.nextLine();
		String t=scanner.nextLine();
		t=t+s;
		System.out.println(t);
		
	}

}


Compiler output:
Main.java:5: error: class zzz is public, should be declared in a file named zzz.java
public class zzz {
       ^
1 error
Language: C++

#include<iostream>
#include<cstdio>
#include<queue>
#include<vector>
#include<string>
using namespace std;

int main(){
	string s1;s2;
	cin >> s1 >> s2;
	cout<< s2 << s1 <<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: 's2' was not declared in this scope; did you mean 's1'?
    9 |         string s1;s2;
      |                   ^~
      |                   s1
Language: Java

import java.util.scanner;
public class Main{
  public static void main(String[]args){
    Scanner scan = new Scanner(System.in);
    String s = scan.next();
    String t = scan.next();
    
    System.out.println(t + s);
  }
}

Compiler output:
Main.java:1: error: cannot find symbol
import java.util.scanner;
                ^
  symbol:   class scanner
  location: package java.util
Main.java:4: error: cannot find symbol
    Scanner scan = new Scanner(System.in);
    ^
  symbol:   class Scanner
  location: class Main
Main.java:4: error: cannot find symbol
    Scanner scan = new Scanner(System.in);
                       ^
  symbol:   class Scanner
  location: class Main
3 errors
Language: C

#include <stdio.h>
 
int main(void){
  int x;
  scanf("%d", &x);
  int i, j, flag;
  i = x;
  if(x == 2){
    printf("%d", 3);
    return 0;
  }
  while(true){
    flag = 0;
    for(j=2; j<x; j++){
      if(i%j == 0){
        flag = 1;
      }
    }
    if(flag == 0){
      printf("%d", i);
      return 0;
    }
    i++;
  }
}

Compiler output:
main.c: In function 'main':
main.c:12:9: error: 'true' undeclared (first use in this function)
   12 |   while(true){
      |         ^~~~
main.c:2:1: note: 'true' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
    1 | #include <stdio.h>
  +++ |+#include <stdbool.h>
    2 | 
main.c:12:9: note: each undeclared identifier is reported only once for each function it appears in
   12 |   while(true){
      |         ^~~~
Language: C

#include <stdio.h>
 
int main(void){
  int x;
  scanf("%d", &x);
  int i, j, flag;
  i = x;
  while(true){
    i++;
    flag = 0;
    for(j=2; j<x; j++){
      if(i%j == 0){
        flag = 1;
      }
    }
    if(flag == 0){
      printf("%d", i);
      return 0;
    } 
  }
}

Compiler output:
main.c: In function 'main':
main.c:8:9: error: 'true' undeclared (first use in this function)
    8 |   while(true){
      |         ^~~~
main.c:2:1: note: 'true' is defined in header '<stdbool.h>'; this is probably fixable by adding '#include <stdbool.h>'
    1 | #include <stdio.h>
  +++ |+#include <stdbool.h>
    2 | 
main.c:8:9: note: each undeclared identifier is reported only once for each function it appears in
    8 |   while(true){
      |         ^~~~
Language: C

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

int main(void){
  char s[100], t[100];

  fgets(s, sizeof(s), stdin);
  s[strlen(s)-1] = '\0'
  fgets(t, sizeof(t), stdin);
  t[strlen(t)-1] = '\0'; 
  printf("%s%s\n", t, s);

  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:24: error: expected ';' before 'fgets'
   10 |   s[strlen(s)-1] = '\0'
      |                        ^
      |                        ;
   11 |   fgets(t, sizeof(t), stdin);
      |   ~~~~~
Language: C

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

int main(){
  char s[100], t[100];

  fgets(s, sizeof(s), stdin);
  s[strlen(s)-1] = '\0'
  fgets(t, sizeof(t), stdin);
  t[strlen(t)-1] = '\0'; 
  printf("%s%s\n", t, s);

  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:24: error: expected ';' before 'fgets'
   10 |   s[strlen(s)-1] = '\0'
      |                        ^
      |                        ;
   11 |   fgets(t, sizeof(t), stdin);
      |   ~~~~~
Language: C

#include <stdio.h>

int main(){
  char s[100], t[100];

  fgets(s, sizeof(s), stdin);
  s[strlen(s)-1] = '\0'
  fgets(t, sizeof(t), stdin);
  t[strlen(t)-1] = '\0'; 
  printf("%s%s\n", t, s);

  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:7:5: error: implicit declaration of function 'strlen' [-Wimplicit-function-declaration]
    7 |   s[strlen(s)-1] = '\0'
      |     ^~~~~~
main.c:2:1: note: include '<string.h>' or provide a declaration of 'strlen'
    1 | #include <stdio.h>
  +++ |+#include <string.h>
    2 | 
main.c:7:5: warning: incompatible implicit declaration of built-in function 'strlen' [-Wbuiltin-declaration-mismatch]
    7 |   s[strlen(s)-1] = '\0'
      |     ^~~~~~
main.c:7:5: note: include '<string.h>' or provide a declaration of 'strlen'
main.c:7:24: error: expected ';' before 'fgets'
    7 |   s[strlen(s)-1] = '\0'
      |                        ^
      |                        ;
    8 |   fgets(t, sizeof(t), stdin);
      |   ~~~~~
Language: C++

#include<bits/stdc++.h>
#include<cstdio>
#include<cstring>
using namespace std;
int main()
{
    char s1[204];
    char s2[102];
    gets(s1);
    gets(s2);
    strcat(s2,s1);
    int k=strlen(s2);
    s2[k]='\0';
    cout<<s2<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    9 |     gets(s1);
      |     ^~~~
      |     getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    char s1[204];
    char s2[102];
    gets(s1);
    gets(s2);
    strcat(s2,s1);
    int k=strlen(s2);
    s2[k]='\0';
    cout<<s2<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |     gets(s1);
      |     ^~~~
      |     getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    char s1[204];
    char s2[102];
    gets(s1);
    gets(s2);
    strcat(s2,s1);
    int k=strlen(s2);
    s2[k]='\0';
    cout<<s2<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |     gets(s1);
      |     ^~~~
      |     getw
Language: Java

import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc = new scanner(System.in);
    int s = sc.nextInt();
    int t = sc.nextInt();
    System.out.println(t+s);
  }
}

Compiler output:
Main.java:5: error: cannot find symbol
    Scanner sc = new scanner(System.in);
                     ^
  symbol:   class scanner
  location: class Main
1 error
Language: C++

#include<bits/std=c++.h>

using namespace std;

int main(){
  string s,t;
  cin >> s >> t;
  cout << t << s << endl;
}

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

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

int main() {
  string S,T;
  cin >> S >> T;
  cout << TS <<endl;
}


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

import java.awt.*;
import java.util.Scanner;
 
public class Strings{
  public static void Main(String[] args){
  String str1,str2;
  Scanner scan=new Scanner(System.in);
  str1=scan.next();
  str2=scan.next();
  String str12=str1.concat(str2);
  System.out.println(str12);
  scan.close();
}
}


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

import java.awt.*;
import java.util.Scanner;
 
public class sample{
  public static void Main(Strings[] args){
  String str1,str2;
  Scanner scan=new Scanner(System.in);
  str1=scan.next();
  str2=scan.next();
  String str12=str1.concat(str2);
  System.out.println(str12);
  scan.close();
}
}


Compiler output:
Main.java:4: error: class sample is public, should be declared in a file named sample.java
public class sample{
       ^
Main.java:5: error: cannot find symbol
  public static void Main(Strings[] args){
                          ^
  symbol:   class Strings
  location: class sample
2 errors
Language: Java

import java.awt.*;
import java.util.Scanner;
 
public class sample{
  public sttic void Main(Strings[] args){
  String str1,str2;
  Scanner scan=new Scanner(System.in);
  str1=scan.next();
  str2=scan.next();
  String str12=str1.concat(str2);
  System.out.println(str12);
  scan.close();
}
}

Compiler output:
Main.java:5: error: <identifier> expected
  public sttic void Main(Strings[] args){
              ^
1 error
Language: Java

import java.awt.*;
import java.util.Scanner;

public class Main(Strings[] args){
  String str1,str2;
  Scanner scan=new Scanner(System.in);
  str1=scan.next();
  str2=scan.next();
  String str12=str1.concat(str2);
  System.out.println(str12);
  scan.close();
}

Compiler output:
Main.java:4: error: '{' expected
public class Main(Strings[] args){
                 ^
Main.java:7: error: <identifier> expected
  str1=scan.next();
      ^
Main.java:8: error: <identifier> expected
  str2=scan.next();
      ^
Main.java:10: error: <identifier> expected
  System.out.println(str12);
                    ^
Main.java:10: error: <identifier> expected
  System.out.println(str12);
                          ^
Main.java:11: error: <identifier> expected
  scan.close();
            ^
6 errors
Language: C++

#include<iostream>
using namespace std;

int main()
{ 
  string S,T;
  cin >> S >> T;
  cout T << S << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: expected ';' before 'T'
    8 |   cout T << S << endl;
      |       ^~
      |       ;
Language: C++

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

int main() {
  string S, T;
  cin >> S >> T;
  cout << T << S;
  return 0;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #inlcude; did you mean #include?
    1 | #inlcude <iostream>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:8:3: error: 'cin' was not declared in this scope
    8 |   cin >> S >> T;
      |   ^~~
a.cc:4:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    3 | #include <cstring>
  +++ |+#include <iostream>
    4 | using namespace std;
a.cc:9:3: error: 'cout' was not declared in this scope
    9 |   cout << T << S;
      |   ^~~~
a.cc:9:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: 'c' was not declared in this scope
    8 |         cout << b+c << endl;
      |                   ^
Language: Java

class Main {
        public static void main (String args []){
        Scanner sc = new Scanner(System.in);
        String str1 = sc.nextLine();
        String str2 = sc.nextLine();
        System.out.print(str1+str2);
    }
}

Compiler output:
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
        ^
  symbol:   class Scanner
  location: class Main
Main.java:3: error: cannot find symbol
        Scanner sc = new Scanner(System.in);
                         ^
  symbol:   class Scanner
  location: class Main
2 errors
Language: Java

class Main (
    public static void main (String args []){
        Scanner sc = new Scanner(System.in);
        String str1 = sc.nextLine();
        String str2 = sc.nextLine();
        System.out.print(str1+str2);
    }
)

Compiler output:
Main.java:1: error: '{' expected
class Main (
          ^
Main.java:2: 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:8: error: class, interface, enum, or record expected
)
^
3 errors
Language: Java

class Main {
  public static void main (String args []) {
    Scanner sc = new Scanner(system.in)
	String str1 = sc.nextLine();
    String str2 = sc.nextLine();
    System.out.println(str1+str2);
  }
}

Compiler output:
Main.java:3: error: ';' expected
    Scanner sc = new Scanner(system.in)
                                       ^
1 error
Language: C++

/**
* @author khokharnikunj8
**/
#include <bits/stdc++.h>
#include "lib/SparseTable.h"

using namespace std;

//macros
#define ll long long
#define endl "\n"
#define pb push_back

//debug

string to_string(string s) {
    return '"' + s + '"';
}

string to_string(const char *s) {
    return to_string((string) s);
}

string to_string(bool b) {
    return (b ? "true" : "false");
}

template<typename A, typename B>
string to_string(pair<A, B> p) {
    return "(" + to_string(p.first) + ", " + to_string(p.second) + ")";
}

template<typename A>
string to_string(A v) {
    bool first = true;
    string res = "{";
    for (const auto &x : v) {
        if (!first) {
            res += ", ";
        }
        first = false;
        res += to_string(x);
    }
    res += "}";
    return res;
}

void debug_out() { cerr << endl; }


template<typename Head, typename... Tail>
void debug_out(Head H, Tail... T) {
    cerr << " " << to_string(H);
    debug_out(T...);
}

#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)

int main() {
    cin.tie(NULL);
    ios_base::sync_with_stdio(false);
    string s, t;
    cin >> s >> t;
    cout << t << s;
    return 0;
}







Compiler output:
a.cc:5:10: fatal error: lib/SparseTable.h: No such file or directory
    5 | #include "lib/SparseTable.h"
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main()
{
  string s,t;
  cin>>s>>t;
  cout<<strcat(s,t);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'strcat' was not declared in this scope
    8 |   cout<<strcat(s,t);
      |         ^~~~~~
a.cc:2:1: note: 'strcat' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  char init[] = "atc";
  char add[] = "oder";
  strcat(init,add);
  cout<<init<<endl;
  
  
  return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: expected '}' at end of input
   10 |   return 0;
      |            ^
a.cc:3:11: note: to match this '{'
    3 | int main(){
      |           ^
Language: C++

#include<iostream>
#include<algorithm>
 
using namespace std;
long long int A,B,K;
 
int main(){
	cin >> A >>B >> K;
  	cout << ((A>K)?(A-K):0) << " " << (((A>K)?B:B+(A-K))>0)?(((A>K)?B:B+(A-K)):0) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:9:83: error: expected ')' before ':' token
    9 |         cout << ((A>K)?(A-K):0) << " " << (((A>K)?B:B+(A-K))>0)?(((A>K)?B:B+(A-K)):0) << endl;
      |                                                                 ~                 ^
      |                                                                                   )
a.cc:9:94: error: expected ':' before ';' token
    9 |         cout << ((A>K)?(A-K):0) << " " << (((A>K)?B:B+(A-K))>0)?(((A>K)?B:B+(A-K)):0) << endl;
      |                                                                                              ^
      |                                                                                              :
a.cc:9:94: error: expected primary-expression before ';' token
Language: C++

#include<iostream>
#include<algorithm>
 
using namespace std;
long long int A,B,K;
 
int main(){
	cin >> A >>B >> K;
  	cout << max(A-K,long long int 0) << " " << ((A-K)>0)?B:B+(A-K) << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: expected primary-expression before 'long'
    9 |         cout << max(A-K,long long int 0) << " " << ((A-K)>0)?B:B+(A-K) << endl;
      |                         ^~~~
a.cc:9:72: error: invalid operands of types 'long long int' and '<unresolved overloaded function type>' to binary 'operator<<'
    9 |         cout << max(A-K,long long int 0) << " " << ((A-K)>0)?B:B+(A-K) << endl;
      |                                                                ~~~~~~~~^~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main(){
    int N, K, R, S, P;
    cin >> N >> K >> R >> S >> P;
    string T;
    cin >> T;
    bitset<100000> win;
    for(int i=0; i<N; i++){
        if(i<K || T[i-K] != T[i] || !win[i-K]) win[i] = 1;
    }
    int64_t ans = 0;
    for(int i=0; i<N; i++) if(win[i]){
        if(T[i] == 'r') ans += P;
        if(T[i] == 's') ans += R;
        if(T[i] == 'p') ans += S;
    }
    cout << ans << endl;
    return 0;
}
#include <bits/stdc++.h>
using namespace std;

int main(){
    int N, K, R, S, P;
    cin >> N >> K >> R >> S >> P;
    string T;
    cin >> T;
    bitset<100000> win;
    for(int i=0; i<N; i++){
        if(i<K || T[i-K] != T[i] || !win[i-K]) win[i] = 1;
    }
    int64_t ans = 0;
    for(int i=0; i<N; i++) if(win[i]){
        if(T[i] == 'r') ans += P;
        if(T[i] == 's') ans += R;
        if(T[i] == 'p') ans += S;
    }
    cout << ans << endl;
    return 0;
}

Compiler output:
a.cc:25:5: error: redefinition of 'int main()'
   25 | int main(){
      |     ^~~~
a.cc:4:5: note: 'int main()' previously defined here
    4 | int main(){
      |     ^~~~
Language: C++

#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include <algorithm>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <numeric>

int main()
{
    string s1, s2;
    cin>>s1>>s2;
    cout<<s2<<s1<<endl;
	return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'string' was not declared in this scope
   14 |     string s1, s2;
      |     ^~~~~~
a.cc:14:5: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:15:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
   15 |     cin>>s1>>s2;
      |     ^~~
      |     std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:15:10: error: 's1' was not declared in this scope
   15 |     cin>>s1>>s2;
      |          ^~
a.cc:15:14: error: 's2' was not declared in this scope
   15 |     cin>>s1>>s2;
      |              ^~
a.cc:16:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |     cout<<s2<<s1<<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:16:19: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   16 |     cout<<s2<<s1<<endl;
      |                   ^~~~
      |                   std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

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

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

int main (){
  	char s[100];
  	char t[100];
	scanf("", %d, s);
	scanf("", %d, t); 
  	printf("%d+%d", t, s);
	return -1;
}

Compiler output:
main.c: In function 'main':
main.c:4:9: error: implicit declaration of function 'scanf' [-Wimplicit-function-declaration]
    4 |         scanf("", %d, s);
      |         ^~~~~
main.c:1:1: note: include '<stdio.h>' or provide a declaration of 'scanf'
  +++ |+#include <stdio.h>
    1 | int main (){
main.c:4:9: warning: incompatible implicit declaration of built-in function 'scanf' [-Wbuiltin-declaration-mismatch]
    4 |         scanf("", %d, s);
      |         ^~~~~
main.c:4:9: note: include '<stdio.h>' or provide a declaration of 'scanf'
main.c:4:19: error: expected expression before '%' token
    4 |         scanf("", %d, s);
      |                   ^
main.c:5:19: error: expected expression before '%' token
    5 |         scanf("", %d, t);
      |                   ^
main.c:6:9: error: implicit declaration of function 'printf' [-Wimplicit-function-declaration]
    6 |         printf("%d+%d", t, s);
      |         ^~~~~~
main.c:6:9: note: include '<stdio.h>' or provide a declaration of 'printf'
main.c:6:9: warning: incompatible implicit declaration of built-in function 'printf' [-Wbuiltin-declaration-mismatch]
main.c:6:9: note: include '<stdio.h>' or provide a declaration of 'printf'
Language: C++

package Atcoder;
import java.io.*;
public class sample2 {
    public static void main(String[] args)throws IOException{
        BufferedReader br =
                new BufferedReader(new InputStreamReader(System.in));

        String str1 = br.readLine();
        String str2 = br.readLine();

        System.out.println(str2 + str1);
    }
}


Compiler output:
a.cc:1:1: error: 'package' does not name a type
    1 | package Atcoder;
      | ^~~~~~~
a.cc:2:1: error: 'import' does not name a type
    2 | import java.io.*;
      | ^~~~~~
a.cc:2:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:3:1: error: expected unqualified-id before 'public'
    3 | public class sample2 {
      | ^~~~~~
Language: Java

import java.util.Scanner;
public class dsad {
    

    public static void main(String[] args) {
        Scanner in=new Scanner(System.in);
        String a=in.next();
        String b=in.next();
        System.out.println(b+a);
    }
    
}


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

import java.util.Scanner;

public class St {

    public static String merge(String s, String t) {
        if (s.length() < 1 || s.length() > 100) {
            return null;
        }
        if (s.length() == 0 && t.length() == 0) {
            return null;
        }
        if (s.length() == 0 && t.length() != 0) {
            return t;
        }
        if (t.length() == 0 && s.length() != 0) {
            return s;
        }
        return t + s;
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String s1 = s.next();
        String s2 = s.next();
        System.out.println(merge(s1, s2));
    }

}


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

import java.util.Scanner;
 
public class St {
 
    public static String merge(String s, String t) {
        if (s.length() < 1 || s.length() > 100) {
            return null;
        }
        if (s.length() == 0 && t.length() == 0) {
            return null;
        }
        if (s.length() == 0 && t.length() != 0) {
            return t;
        }
        if (t.length() == 0 && s.length() != 0) {
            return s;
        }
        return t + s;
    }
 
    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String s1 = s.next();
        String s2 = s.next();
        System.out.println(merge(s1, s2));
    }
 
}

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

#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<n;i++)
typedef long long ll;

int main(){
  string s,t;
  cin >> s >> t;
  cout << t << d << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:16: error: 'd' was not declared in this scope
   11 |   cout << t << d << endl;
      |                ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<n;i++)
typedef long long ll;

int main(){
  string s,t;
  cin >> s >> t;
  cout << s << t << endl
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:25: error: expected ';' before '}' token
   11 |   cout << s << t << endl
      |                         ^
      |                         ;
   12 | }
      | ~
Language: Java

import java.util.Scanner;

class St {

    public static String merge(String s, String t) {
        return t + s;
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String s1 = s.next();
        String s2 = s.next();
        System.out.println(merge(s1, s2));
    }

Compiler output:
Main.java:14: error: reached end of file while parsing
    }
     ^
1 error
Language: Java


import java.util.Scanner;

public class St {

    public static String merge(String s, String t) {
        if(s.length()==0){
            if(t.length()==0){
                return null;
            }
            return t;
        }
        if(t.length()==0){
            if(s.length()==0){
                return null;
            }
            return s;
        }
        return t + s;
    }

    public static void main(String[] args) {
       String s1="saff";
       String s2="daf";
        System.out.println(merge(s1, s2));
    }

}


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

package st;

import java.util.Scanner;

public class St {

    public static String merge(String s, String t) {
        return t + s;
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String s1 = s.next();
        String s2 = s.next();
        System.out.println(merge(s1, s2));
    }

}


Compiler output:
Main.java:5: error: class St is public, should be declared in a file named St.java
public class St {
       ^
1 error
Language: Java

import java.util.Scanner;

public class St {

    public static String merge(String s, String t) {
        return t + s;
    }

    public static void main(String[] args) {
        Scanner s = new Scanner(System.in);
        String s1 = s.next();
        String s2 = s.next();
        System.out.println(merge(s1, s2));
    }

}


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

package st;

import java.util.Scanner;

public class St {
    public static String merge(String s,String t){
        return t+s;
    }
    public static void main(String[] args) {
    Scanner s=new Scanner(System.in);
    String s1=s.next();
    String s2=s.next();
        System.out.println(merge(s1, s2));
    }
    
}


Compiler output:
Main.java:5: error: class St is public, should be declared in a file named St.java
public class St {
       ^
1 error
Language: C++

#include<iostream>
#include<cstring>
int main()
{
  string s,s1;
  cin>>s>>s1;
  cout<<s1<<s<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'string' was not declared in this scope
    5 |   string s,s1;
      |   ^~~~~~
a.cc:5:3: note: suggested alternatives:
In file included from /usr/include/c++/14/iosfwd:41,
                 from /usr/include/c++/14/ios:40,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
In file included from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44:
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin>>s>>s1;
      |   ^~~
      |   std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s>>s1;
      |        ^
a.cc:6:11: error: 's1' was not declared in this scope
    6 |   cin>>s>>s1;
      |           ^~
a.cc:7:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |   cout<<s1<<s<<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:7:16: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |   cout<<s1<<s<<endl;
      |                ^~~~
      |                std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: Java

public class St {
    public static String merge(String s,String t){
        return t+s;
    }
    public static void main(String[] args) {
    Scanner s=new Scanner(System.in);
    String s1=s.next();
    String s2=s.next();
        System.out.println(merge(s1, s2));
    }
    
}


Compiler output:
Main.java:1: error: class St is public, should be declared in a file named St.java
public class St {
       ^
Main.java:6: error: cannot find symbol
    Scanner s=new Scanner(System.in);
    ^
  symbol:   class Scanner
  location: class St
Main.java:6: error: cannot find symbol
    Scanner s=new Scanner(System.in);
                  ^
  symbol:   class Scanner
  location: class St
3 errors
Language: C++

using namespace std;
int main(){
  string s;
  cin >> s;
  string t;
  cin >> t;
  cout << t << s << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'string' was not declared in this scope
    3 |   string s;
      |   ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | using namespace std;
a.cc:4:3: error: 'cin' was not declared in this scope
    4 |   cin >> s;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:4:10: error: 's' was not declared in this scope
    4 |   cin >> s;
      |          ^
a.cc:5:9: error: expected ';' before 't'
    5 |   string t;
      |         ^~
      |         ;
a.cc:6:10: error: 't' was not declared in this scope
    6 |   cin >> t;
      |          ^
a.cc:7:3: error: 'cout' was not declared in this scope
    7 |   cout << t << s << endl;
      |   ^~~~
a.cc:7:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:7:21: error: 'endl' was not declared in this scope
    7 |   cout << t << s << endl;
      |                     ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

using namespace std;
int main() {
  strings s;
  cin >> s;
  strings t;
  cin >> t;
  cout << t << s << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'strings' was not declared in this scope
    3 |   strings s;
      |   ^~~~~~~
a.cc:4:3: error: 'cin' was not declared in this scope
    4 |   cin >> s;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:4:10: error: 's' was not declared in this scope
    4 |   cin >> s;
      |          ^
a.cc:5:10: error: expected ';' before 't'
    5 |   strings t;
      |          ^~
      |          ;
a.cc:6:10: error: 't' was not declared in this scope
    6 |   cin >> t;
      |          ^
a.cc:7:3: error: 'cout' was not declared in this scope
    7 |   cout << t << s << endl;
      |   ^~~~
a.cc:7:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:7:21: error: 'endl' was not declared in this scope
    7 |   cout << t << s << endl;
      |                     ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C

#include <iostream>
#include <algorithm>
#include <bitset>
#include <map>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <cstring>
#include <utility>
#include <vector>
#include <complex>
#include <valarray>
#include <fstream>
#include <cassert>
#include <cmath>
#include <functional>
#include <iomanip>
#include <numeric>
#include <climits>
#include <random>

using namespace std;

string S, T;

int main() {

    cin >> S >> T;

    cout << T + S << endl;

    return 0;

}

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

#include<iostream>
#include<iomanip>

using namespace std;

int main(){
  std::cin.tie(nullptr);                  // 標準入出力高速化
  std::ios_base::sync_with_stdio(false);  // SとS++の入出力出力を非同期
  strings s,t;
  cin>>s>>t;
  cout<<s<<t<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:3: error: 'strings' was not declared in this scope; did you mean 'stdin'?
    9 |   strings s,t;
      |   ^~~~~~~
      |   stdin
a.cc:10:8: error: 's' was not declared in this scope
   10 |   cin>>s>>t;
      |        ^
a.cc:10:11: error: 't' was not declared in this scope; did you mean 'tm'?
   10 |   cin>>s>>t;
      |           ^
      |           tm
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReaader;

class Main{
static public void main(String[] args){
  InputStreamReader isr = new InputStreamReader(System.in);
  BufferedReader br = new BufferedReader(isr);
 
  String[] S = null;
  String[] T = null;
  
  try{
    S = br.readLine();
    br.close();
    T = br.readLine();
    br.close();
  }catch(IOException e){
   e.printStackTrace(); 
  }
  
  System.out.println(T+S);
}
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReaader;

public static void main(String[] args){
  InputStreamReader isr = new InputStreamReader(System.in);
  BufferedReader br = new BufferedReader(isr);

  String[] S = null;
  String[] T = null;
  
  try{
    S = br.readLine();
    br.close();
    T = br.readLine();
    br.close();
  }catch(IOException e){
   e.printStackTrace(); 
  }
  
  System.out.println(T+S);
}
}

Compiler output:
Main.java:24: error: illegal start of type
import java.io.BufferedReader;
^
Main.java:24: error: <identifier> expected
import java.io.BufferedReader;
                             ^
Main.java:25: error: illegal start of type
import java.io.IOException;
^
Main.java:25: error: <identifier> expected
import java.io.IOException;
                          ^
Main.java:26: error: illegal start of type
import java.io.InputStreamReaader;
^
Main.java:26: error: <identifier> expected
import java.io.InputStreamReaader;
                                 ^
6 errors
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReaader;

public static void main(String[] args){
  InputStreamReader isr = new InputStreamReader(System.in);
  BufferedReader br = new BufferedReader(isr);

  String[] S = null;
  String[] T = null;
  
  try{
    S = br.readLine();
    br.close();
    T = br.readLine();
    br.close();
  }catch(IOException e){
   e.printStackTrace(); 
  }
  
  System.out.println(T+S);
}

Compiler output:
Main.java:5: 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: C++

#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
int main() {
　string s,t;
  cin>>s>>t;
  cout<<t<<s<<endl;
}


Compiler output:
a.cc:5:1: error: extended character 　 is not valid in an identifier
    5 | 　string s,t;
      | ^
a.cc: In function 'int main()':
a.cc:5:1: error: '\U00003000string' was not declared in this scope
    5 | 　string s,t;
      | ^~~~~~~~
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s>>t;
      |        ^
a.cc:6:11: error: 't' was not declared in this scope; did you mean 'tm'?
    6 |   cin>>s>>t;
      |           ^
      |           tm
Language: C++

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

int main(){
  stirng s,t;
  cin >> s >> t;
  
  cout << s << t << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'stirng' was not declared in this scope
    5 |   stirng s,t;
      |   ^~~~~~
a.cc:6:10: error: 's' was not declared in this scope
    6 |   cin >> s >> t;
      |          ^
a.cc:6:15: error: 't' was not declared in this scope; did you mean 'tm'?
    6 |   cin >> s >> t;
      |               ^
      |               tm
Language: Java

import java.util.Scanner;

public class hello {
    public static void main( String[]args) {
        Scanner lol = new Scanner(System.in);
        String we = lol.next();
        String j = lol.next();
        lol.close();
        System.out.print(j + we);}
}

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

#include<stdio.h>
#include<string.h>
int main()
{
  char a[100],b[100],c[200];
  scanf("%s%s",a,b);
  c=strcat(b,a);
  printf("%s",c);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:4: error: assignment to expression with array type
    7 |   c=strcat(b,a);
      |    ^
Language: Java

import java.util.Scanner;

class Main {
 public static void main(String[] args){
   //変数の初期化
   Scanner scanner = new Scanner(System.in);
   
   //入力
   System.out.print("input: ");
   String input = scanner.next();
   
   //置換
   input.replace();
   
   //出力
   System.out.println("output: " + input);
   
 }
}

Compiler output:
Main.java:13: error: no suitable method found for replace(no arguments)
   input.replace();
        ^
    method String.replace(char,char) is not applicable
      (actual and formal argument lists differ in length)
    method String.replace(CharSequence,CharSequence) is not applicable
      (actual and formal argument lists differ in length)
1 error
Language: C++

#include "stdafx.h"
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <vector>
#include <map>
#include <unordered_map>
#include <algorithm>
using namespace std;


int main() {

	char a[101], b[101];
	cin >> a >> b;
	cout << b << a << "\n";

	return 0;
}


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

#include <iostream>
using namespace std;

int main(){
  strins s,t;
  cin>>s>>t;
  cout<<t<<s<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'strins' was not declared in this scope; did you mean 'stdin'?
    5 |   strins s,t;
      |   ^~~~~~
      |   stdin
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s>>t;
      |        ^
a.cc:6:11: error: 't' was not declared in this scope; did you mean 'tm'?
    6 |   cin>>s>>t;
      |           ^
      |           tm
Language: C++

#include<bits/stdc+.h>

using namespace std;
int main(){

  string a, b;
  cin >> a >> b;
  cout << b+a << endl;
return 0;
}

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<studio.h>
#include<iostream>

int main(){
  char a[];
  char b[];
  cin >> a;
  cin >> b;
  printf("%s%s",b,a);
}

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

#include<stdio.h>
int main()
{
  char S[100],T[100];
  scanf("%s %s",&S,%T);
  printf("%s%s",S,T);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:5:20: error: expected expression before '%' token
    5 |   scanf("%s %s",&S,%T);
      |                    ^
Language: C++

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

int main(){
  int string s,t;
  cin>>s>>t;
  cout<<t<<s;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:14: error: expected initializer before 's'
    5 |   int string s,t;
      |              ^
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s>>t;
      |        ^
a.cc:6:11: error: 't' was not declared in this scope; did you mean 'tm'?
    6 |   cin>>s>>t;
      |           ^
      |           tm
Language: C++

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

int main(){
  int string s,t;
  cin>>s;
  cin>>t;
  cout<<t<<s;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:14: error: expected initializer before 's'
    5 |   int string s,t;
      |              ^
a.cc:6:8: error: 's' was not declared in this scope
    6 |   cin>>s;
      |        ^
a.cc:7:8: error: 't' was not declared in this scope; did you mean 'tm'?
    7 |   cin>>t;
      |        ^
      |        tm
Language: C++

#include"iostream"
#include"string.h"
using namespace std;
int main(void) {
	string a, b;
	cin >> a >> b;
	for (int i = 0; i < a.length() + b.length(); i++) {
		if(i % 2 = 1){
        	cout << b.at(i)
        }else{
        	cout << a.at(i)
        }
	}
 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:22: error: lvalue required as left operand of assignment
    8 |                 if(i % 2 = 1){
      |                    ~~^~~
a.cc:9:32: error: expected ';' before '}' token
    9 |                 cout << b.at(i)
      |                                ^
      |                                ;
   10 |         }else{
      |         ~                       
a.cc:11:32: error: expected ';' before '}' token
   11 |                 cout << a.at(i)
      |                                ^
      |                                ;
   12 |         }
      |         ~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
    String S, T;
  cin >> S >> T;  
  cout << T + S << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:5: error: 'String' was not declared in this scope
    5 |     String S, T;
      |     ^~~~~~
a.cc:6:10: error: 'S' was not declared in this scope
    6 |   cin >> S >> T;
      |          ^
a.cc:6:15: error: 'T' was not declared in this scope
    6 |   cin >> S >> T;
      |               ^