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

#include<stdio.h>
 
int main(void)
{
	int c;
    scanf("%d",&c);
	char a[110];
    char b[110];
    
    scanf("%s%s",a,b)
    
    for( int i=0 ; i < c; i++)
    {
    	printf("%c%c",a[i],b[i]);
  	}
}


Compiler output:
main.c: In function 'main':
main.c:10:22: error: expected ';' before 'for'
   10 |     scanf("%s%s",a,b)
      |                      ^
      |                      ;
   11 | 
   12 |     for( int i=0 ; i < c; i++)
      |     ~~~
Language: C

#include<stdio.h>
2. 
3.int main(void)
4.{
5.	int c;
6.    scanf("%d",&c);
7.	char a[110];
8.    char b[110];
9.    
10.    scanf("%s%s",a,b)
11.    
12.    for( int i=0 ; i < c; i++)
13.    {
14.    	printf("%c%c",a[i],b[i]);
15.  	}
16.}


Compiler output:
main.c:2:1: error: expected identifier or '(' before numeric constant
    2 | 2.
      | ^~
main.c:3:1: error: invalid suffix "int" on floating constant
    3 | 3.int main(void)
      | ^~~~~
Language: C

#include<stdio.h>

int main(void)
{
	int c;
    scanf("%d",&c);
	char a[110];
    char b[110];
    
    scanf("%s%s",a,b)
    
    for( int i=0 ; i < a; i++)
    {
    	printf("%c%c",a[i],b[i]);
  	}
}


Compiler output:
main.c: In function 'main':
main.c:10:22: error: expected ';' before 'for'
   10 |     scanf("%s%s",a,b)
      |                      ^
      |                      ;
   11 | 
   12 |     for( int i=0 ; i < a; i++)
      |     ~~~
Language: C++

#include <iostream>
using namespace std;

int main() {
  int n; cin >> n;
  string x, y; cin >> x >> y;
  fore(i, 0, n) cout << x[i] << y[i];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:8: error: 'i' was not declared in this scope
    7 |   fore(i, 0, n) cout << x[i] << y[i];
      |        ^
a.cc:7:3: error: 'fore' was not declared in this scope
    7 |   fore(i, 0, n) cout << x[i] << y[i];
      |   ^~~~
Language: C++

#include<iostream>
using namespace std;
 
int main(){
  char S[110];
  char T[110];
  int a;cin>>a;
  cin>>S>>T;
  for(int i=0;i<a;i++) cout<<S[i]<<T[i]); cout<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:40: error: expected ';' before ')' token
    9 |   for(int i=0;i<a;i++) cout<<S[i]<<T[i]); cout<<endl;
      |                                        ^
      |                                        ;
Language: C++

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

int main() {
      
    char a = [100]
    char b = [100]

    cin >> a >> b;

    rep(i,0) cout << a[i] << b[i];

    endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: expected identifier before numeric constant
    8 |     char a = [100]
      |               ^~~
a.cc:9:5: error: type-specifier invalid in lambda
    9 |     char b = [100]
      |     ^~~~
a.cc:9:5: warning: parameter declaration before lambda declaration specifiers only optional with '-std=c++2b' or '-std=gnu++2b' [-Wc++23-extensions]
a.cc: In lambda function:
a.cc:9:10: error: expected '{' before 'b'
    9 |     char b = [100]
      |          ^
a.cc: In function 'int main()':
a.cc:8:14: error: invalid user-defined conversion from 'main()::<lambda()>' to 'char' [-fpermissive]
    8 |     char a = [100]
      |              ^~~~~
    9 |     char b = [100]
      |     ~~~~      
a.cc:8:14: note: candidate is: 'constexpr main()::<lambda()>::operator void (*)()() const' (near match)
    8 |     char a = [100]
      |              ^
a.cc:8:14: note:   no known conversion from 'void (*)()' to 'char'
a.cc:9:10: error: expected ',' or ';' before 'b'
    9 |     char b = [100]
      |          ^
a.cc:13:23: error: invalid types 'char[int]' for array subscript
   13 |     rep(i,0) cout << a[i] << b[i];
      |                       ^
a.cc:13:30: error: 'b' was not declared in this scope
   13 |     rep(i,0) cout << a[i] << b[i];
      |                              ^
a.cc:15:9: error: statement cannot resolve address of overloaded function
   15 |     endl;
      |         ^
Language: C++

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

int main() {
      
    string a = [100]
    string b = [100]

    cin >> a >> b;

    rep(0,i) cout << a[i] << b[i];

    endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: expected identifier before numeric constant
    8 |     string a = [100]
      |                 ^~~
a.cc: In lambda function:
a.cc:9:5: error: expected '{' before 'string'
    9 |     string b = [100]
      |     ^~~~~~
a.cc: In function 'int main()':
a.cc:8:16: error: conversion from 'main()::<lambda()>' to non-scalar type 'std::string' {aka 'std::__cxx11::basic_string<char>'} requested
    8 |     string a = [100]
      |                ^~~~~
a.cc:9:5: error: expected ',' or ';' before 'string'
    9 |     string b = [100]
      |     ^~~~~~
a.cc:13:9: error: expected unqualified-id before numeric constant
   13 |     rep(0,i) cout << a[i] << b[i];
      |         ^
a.cc:2:27: note: in definition of macro 'rep'
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                           ^
a.cc:13:9: error: expected ';' before numeric constant
   13 |     rep(0,i) cout << a[i] << b[i];
      |         ^
a.cc:2:27: note: in definition of macro 'rep'
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                           ^
a.cc:13:9: error: lvalue required as left operand of assignment
   13 |     rep(0,i) cout << a[i] << b[i];
      |         ^
a.cc:2:27: note: in definition of macro 'rep'
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                           ^
a.cc:13:11: error: 'i' was not declared in this scope
   13 |     rep(0,i) cout << a[i] << b[i];
      |           ^
a.cc:2:38: note: in definition of macro 'rep'
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                                      ^
a.cc:2:39: error: expected ')' before ';' token
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                      ~                ^
a.cc:13:5: note: in expansion of macro 'rep'
   13 |     rep(0,i) cout << a[i] << b[i];
      |     ^~~
a.cc:13:9: error: lvalue required as increment operand
   13 |     rep(0,i) cout << a[i] << b[i];
      |         ^
a.cc:2:41: note: in definition of macro 'rep'
    2 | #define rep(i, n) for(int i = 0; i < n; i++)
      |                                         ^
a.cc:15:9: error: statement cannot resolve address of overloaded function
   15 |     endl;
      |         ^
Language: C++

#include<stdio.h>
#include<string>
#include<stdlib.h>
#include<iostream>
using namespace std;

int main(){
  string S,T;
  int N;
  cin >> N;
  cin >> S >> T;
  string A[2*N];
  for (int i = 0 ; i<N;i++){
    A[2*i]=S[i];
    A[2*i+1]=T[i];
  }
  cout << A <<endl;
  return 0;


Compiler output:
a.cc: In function 'int main()':
a.cc:18:12: error: expected '}' at end of input
   18 |   return 0;
      |            ^
a.cc:7:11: note: to match this '{'
    7 | int main(){
      |           ^
Language: C++

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

int main(){
  string S,T;
  int N;
  cin >> N;
  cin >> S T;
  string A[2*N]
  for (int i=0;i<N;i++){
    A[2*i]=S[i];
    A[2*i+1]=T[i];
  }
  cout << A <<endl;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: expected ';' before 'T'
    8 |   cin >> S T;
      |           ^~
      |           ;
a.cc:10:3: error: expected initializer before 'for'
   10 |   for (int i=0;i<N;i++){
      |   ^~~
a.cc:10:16: error: 'i' was not declared in this scope
   10 |   for (int i=0;i<N;i++){
      |                ^
a.cc:14:11: error: 'A' was not declared in this scope
   14 |   cout << A <<endl;
      |           ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: 'i' was not declared in this scope
    7 |   for(i=0;i<n;i++) cout<<s[i]<<t[i];
      |       ^
Language: Java

import java.io.*;
import java.util.*;
import java.math.*;
import java.awt.Point;

public class Code {
	static final long MOD = 998244353L;
	//static final long INF = -1000000000000000007L;
	//static final long MOD = 1000000007L;
	//static final int INF = 1000000007;
	public static void main(String[] args) {
		FastScanner sc = new FastScanner();
		PrintWriter pw = new PrintWriter(System.out);
		int N = sc.ni();
		StringBuilder ans = new StringBuilder();
		String s = sc.next();
		String t = sc.next();
		for (int i = 0; i < N; i++) {
			ans.append(s.charAt(i));
			ans.append(t.charAt(i));
		}
		pw.println(ans);
		pw.close();
	}
	
	//Fast exponentiation (x^y mod m)
	public static long power(long x, long y, long m) { 
		long ans = 1;
		x %= m;
		while (y > 0) { 
			if(y % 2 == 1) 
				ans = (ans * x) % m; 
			y /= 2;  
			x = (x * x) % m;
		} 
		return ans; 
	}
	
    public static int[][] sort(int[][] array) {
    	//Sort an array (immune to quicksort TLE)
		Random rgen = new Random();
		for (int i = 0; i < array.length; i++) {
		    int randomPosition = rgen.nextInt(array.length);
		    int[] temp = array[i];
		    array[i] = array[randomPosition];
		    array[randomPosition] = temp;
		}
		Arrays.sort(array, new Comparator<int[]>() {
			  @Override
        	  public int compare(int[] arr1, int[] arr2) {
				  return arr1[0]-arr2[0]; //ascending order
	          }
		});
		return array;
	}
    
    public static long[][] sort(long[][] array) {
    	//Sort an array (immune to quicksort TLE)
		Random rgen = new Random();
		for (int i = 0; i < array.length; i++) {
		    int randomPosition = rgen.nextInt(array.length);
		    long[] temp = array[i];
		    array[i] = array[randomPosition];
		    array[randomPosition] = temp;
		}
		Arrays.sort(array, new Comparator<long[]>() {
			  @Override
        	  public int compare(long[] arr1, long[] arr2) {
				  return 0;
	          }
		});
		return array;
	}
    
    static class FastScanner { 
        BufferedReader br; 
        StringTokenizer st; 
  
        public FastScanner() { 
            br = new BufferedReader(new InputStreamReader(System.in)); 
        } 
  
        String next() { 
            while (st == null || !st.hasMoreElements()) { 
                try { 
                    st = new StringTokenizer(br.readLine());
                } catch (IOException  e) { 
                    e.printStackTrace(); 
                } 
            } 
            return st.nextToken(); 
        } 
  
        int ni() { 
            return Integer.parseInt(next()); 
        } 
  
        long nl() { 
            return Long.parseLong(next()); 
        } 
  
        double nd() { 
            return Double.parseDouble(next()); 
        } 
  
        String nextLine() { 
            String str = ""; 
            try { 
                str = br.readLine(); 
            } catch (IOException e) {
                e.printStackTrace(); 
            } 
            return str;
        }
    }
}

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

#include <bits/stdc++.h>
#define rep(X,N) for(ll X = 0; X < (N); X++)
#define PI (acos(-1.0))
#define pback push_back
#define mpair make_pair
#define divceil(A, B) ((A + (B - 1)) / B)
#define MODN 1000000007
#define ALL(V) (V).begin(),(V).end()
#define CERR if(false) cerr

typedef long long ll;

using namespace std;

int main(){

    int n;
    string a,b;

    cin >> n;
    cin >> s;

    rep(i,n){
        cout << s[i];
        cout << s[i + n + 1];
    }

    cout << endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:12: error: 's' was not declared in this scope
   21 |     cin >> s;
      |            ^
Language: C++

#include<iostream>
#include<string>

using namespace std;

int main(){
    int N;
    string S, T;
    string U;
    cin >> N >> S >> T;
    for (int i = 0; i < N; i++){
        U.push_back(S.at(i))
        U.push_back(T.at(i))
    }
    cout << U << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:29: error: expected ';' before 'U'
   12 |         U.push_back(S.at(i))
      |                             ^
      |                             ;
   13 |         U.push_back(T.at(i))
      |         ~
Language: C++

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


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++>
using namespace std;
int main(){
  int n;
  cin>>n;
  string a,b;
  cin>>a>>b;
  for(int i=0;i<=n;i++)
    if((i%2)==0)
      cout<<a[i]<<b[i];
  	else
      cout<<b[i]<<a[i];
}


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

#include<bits/stdc++>
using namespace std;
int main(){
  int n;
  cin>>n;
  string a,b;
  cin>>a>>b;
  for(int i=0;i<=n;i++)
    if((i%2)==0)
      cout<<a[i]<<b[i];
  	else
      cout<<b[i]<<a[i];
}

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

include <bits/stdc++.h>
using namespace std;
 
int main(){
  int N;
  cin >> N;
  string S,T;
  cin >> S >> T;
  for(int i=0;i<N;i++){
    cout << S.at(i) << T.at(i);
  }
  cout << endl;
  return 0;
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> N;
      |   ^~~
a.cc:7:3: error: 'string' was not declared in this scope
    7 |   string S,T;
      |   ^~~~~~
a.cc:8:10: error: 'S' was not declared in this scope
    8 |   cin >> S >> T;
      |          ^
a.cc:8:15: error: 'T' was not declared in this scope
    8 |   cin >> S >> T;
      |               ^
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout << S.at(i) << T.at(i);
      |     ^~~~
a.cc:12:3: error: 'cout' was not declared in this scope
   12 |   cout << endl;
      |   ^~~~
a.cc:12:11: error: 'endl' was not declared in this scope
   12 |   cout << endl;
      |           ^~~~
Language: C++

include <bits/stdc++.h>
using namespace std;
 
int main(){
  int N;
  cin >> N;
  string S,T;
  cin >> S >> T;
  for(int i=0;i<N;i++){
    cout << S.at(i) << T.at(i);
  }
  cout << endl;
  return 0;

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin >> N;
      |   ^~~
a.cc:7:3: error: 'string' was not declared in this scope
    7 |   string S,T;
      |   ^~~~~~
a.cc:8:10: error: 'S' was not declared in this scope
    8 |   cin >> S >> T;
      |          ^
a.cc:8:15: error: 'T' was not declared in this scope
    8 |   cin >> S >> T;
      |               ^
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout << S.at(i) << T.at(i);
      |     ^~~~
a.cc:12:3: error: 'cout' was not declared in this scope
   12 |   cout << endl;
      |   ^~~~
a.cc:12:11: error: 'endl' was not declared in this scope
   12 |   cout << endl;
      |           ^~~~
a.cc:13:12: error: expected '}' at end of input
   13 |   return 0;
      |            ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include <iostream>
using namespace std;
int main(){
  int N;
  string S,T;
  cin >> N >> S >> T;
  for(int i=0;i<=N;i++)
    cout << N[i] << T[i];
  
  cout << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: invalid types 'int[int]' for array subscript
    8 |     cout << N[i] << T[i];
      |              ^
Language: C++

#include<bits/std++.h>
using namespace std ;
 
int  main()
{
  string s ,r ,t ;
  int n;
  cin>>n;
  cin>>s>>r;
  int x =0 ,y=0;
  for(int i =0;x<s.size()&&y<r.size();i++)
  {
    if(i%2==0){
    t+=s[x++];
    }
  }
  cout<<t<<endl;
}

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

#include<iostream>
using namespace std ;
 
int  main()
{
  string s ,r ,t ;
  int n;
  cin>>n;
  cin>>s>>r;
  int x =0 ,y=0;
  for(int i =0;x<s.size()&&y<r.size();i++)
  {
    if(i%2==0){
    t+=s[x++];
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:15:6: error: expected '}' at end of input
   15 |     }
      |      ^
a.cc:12:3: note: to match this '{'
   12 |   {
      |   ^
a.cc:15:6: error: expected '}' at end of input
   15 |     }
      |      ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

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

int  main()
{
  string s ,r ,t ;
  int n;
  cin>>n;
  cin>>s>>r;
  int x =0 ,y=0;
  for(int i =0;x<s.size()&&y<r.size();i++)
  {
    if(i%2==0){
    t+=s[x++];
    }
    else{
      t+=r[y++];
    }
  }
  
  cout<<t<<endl;
}
  

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

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int main(){
    FAST
    int n;
    cin>>n;
    string s,t;
    cin>>s>>t;
    string new="";
    for(int i=0;i<s.length();i++){
        new+=(s[i]+t[i]);
    }
    cout<<new;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: expected unqualified-id before 'new'
   11 |     string new="";
      |            ^~~
a.cc:13:12: error: expected type-specifier before '+=' token
   13 |         new+=(s[i]+t[i]);
      |            ^~
a.cc:15:14: error: expected type-specifier before ';' token
   15 |     cout<<new;
      |              ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
int main(){
    FAST
    int n;
    cin>>n;
    string s,t;
    cin>>s>>t;
    string new="";
    for(int i=0;i<s.length();i++){
        new=new+s[i]+t[i];
    }
    cout<<new;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: expected unqualified-id before 'new'
   11 |     string new="";
      |            ^~~
a.cc:13:12: error: expected type-specifier before '=' token
   13 |         new=new+s[i]+t[i];
      |            ^
a.cc:13:16: error: expected type-specifier before '+' token
   13 |         new=new+s[i]+t[i];
      |                ^
a.cc:15:14: error: expected type-specifier before ';' token
   15 |     cout<<new;
      |              ^
Language: C++

C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
2
ip cc
icpc
Process finished with exit code 0


Compiler output:
a.cc:1:3: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |   ^
a.cc:1:9: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |         ^
a.cc:1:15: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |               ^
a.cc:1:29: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |                             ^
a.cc:1:40: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |                                        ^
a.cc:1:58: error: stray '\' in program
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |                                                          ^
a.cc:1:2: error: found ':' in nested-name-specifier, expected '::'
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      |  ^
      |  ::
a.cc:1:1: error: 'C' does not name a type
    1 | C:\Users\manda\CLionProjects\codeforces\cmake-build-debug\codeforces.exe
      | ^
Language: C++

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

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

#include<iostream>
#include<strings>
using namespace std;
int main()
{
  string a;
  string b;
  int n;
  cin>>n;
  cin>>a;
  cin>>b;
  string ans="";
  
 for(int i=0;i<n;i++)
 {
   s=s+a[i];
   s=s+b[i];
   
 }
  cout<<s;
}

Compiler output:
a.cc:2:9: fatal error: strings: No such file or directory
    2 | #include<strings>
      |         ^~~~~~~~~
compilation terminated.
Language: C++

//shara's here
#include <bits/stdc++.h>
#include<windows.h>
using namespace std;
typedef int q;
typedef double w;
typedef string s;
typedef long long ll;
int main(){
    s ss,dd;
    int x;
    cin>>x;
    cin>>ss>>dd;
    for(int i=0;i<x;i++){
     cout<<ss[i]<<dd[i];
    }












return 0;}
/*
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██▀████████████████████▐██████░▐██░░░░░░▀▀█████████
██░████████████████████▐█████▌░██▌▄░░░░▄▄░▄████▀███
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████████████████████████████▀░░▀░░▀▀░░░░▄▄▄██▀░░▀▀█
███████████████████████████▌░░░░░░░░░░░███████░░░▄█
███████████████▄░▀████████▀░░░░░░▀░░░░███████▌░░░██
███▄▄████████████▄░▀██████▄░░░░░█░░░░████████░░░▀▀
░▀█████████████████▄░▀█████░░░░██░░░░▀██████░░░░░▄█
▐█▄▀█████████████████▄░▀████░░░██▌░░░▐████▀░░░░▄███
▐███▄▀▀█████████████████▄░▀▀░░░░▀██▌▄█▀▀░░░▄▄██████
▀▀▀▀▀░░░▀▀▀▀▀░░░▀▀▀▀▀▀▀▀▀▀▀░░░░░░░▀▀░░░░░░▀▀▀▀▀▀▀▀▀
*/


Compiler output:
a.cc:3:9: fatal error: windows.h: No such file or directory
    3 | #include<windows.h>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
    int N;
    cin >> N;
    string s,t;
    
    cin >> s >> t;
    string ans;
    for(int i=0;i<N;i++){
        ans = ans + s[i] + t[i]
    }

    cout << ans <<"\n";

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:32: error: expected ';' before '}' token
   11 |         ans = ans + s[i] + t[i]
      |                                ^
      |                                ;
   12 |     }
      |     ~
Language: C++

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

void solve()
{
  int N;
  cin >> S >> T;
  string ans = "";
  rep(i, N){
      ans += S[i];
      ans += T[i];
  }
  cout << ans;
}
int main()
{
  cin.tie(0);
  ios::sync_with_stdio(false);
  cout << fixed << setprecision(11);
  solve();
  return 0; 
}


Compiler output:
a.cc: In function 'void solve()':
a.cc:9:10: error: 'S' was not declared in this scope
    9 |   cin >> S >> T;
      |          ^
a.cc:9:15: error: 'T' was not declared in this scope
    9 |   cin >> S >> T;
      |               ^
Language: C++

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

int main() {
  int n; cin >> n;
  string s,t; cin >> s >> t;
  rep(i,n){
   cout << s[i] << t[i]; 
  }
  endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:7: error: statement cannot resolve address of overloaded function
   12 |   endl;
      |       ^
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:5:28: error: expected ';' before 'cin'
    5 |     int n;string a,b;cin>>n
      |                            ^
      |                            ;
    6 |     cin>>a>>b;
      |     ~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
   
  int N;
  
  cin >> N;
  
  char S;
  
  char T;
  
  cin >> S >> T;
  
  for (int i=0; i<N; i++){
   printf(S[i]);
  }
  
  for (int i=0; i<N; i++){
    printf(T[i]);
  }
   }
  

Compiler output:
a.cc: In function 'int main()':
a.cc:17:12: error: invalid types 'char[int]' for array subscript
   17 |    printf(S[i]);
      |            ^
a.cc:21:13: error: invalid types 'char[int]' for array subscript
   21 |     printf(T[i]);
      |             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
   
  int N;
  
  cin >> N;
  
  string S;
  
  string T;
  
  cin >> S >> T;
  
  for (int i=0 i<N i++){
  cout << S << endl;
  }
  
  for (int i=0 i<N i++){
    cout << T << endl;
  }
   }
  
  
  
    

Compiler output:
a.cc: In function 'int main()':
a.cc:16:15: error: expected ';' before 'i'
   16 |   for (int i=0 i<N i++){
      |               ^~
      |               ;
a.cc:16:19: error: expected ';' before 'i'
   16 |   for (int i=0 i<N i++){
      |                   ^~
      |                   ;
a.cc:20:15: error: expected ';' before 'i'
   20 |   for (int i=0 i<N i++){
      |               ^~
      |               ;
a.cc:20:19: error: expected ';' before 'i'
   20 |   for (int i=0 i<N i++){
      |                   ^~
      |                   ;
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: expected ';' before ')' token
   15 |   for (N){
      |         ^
      |         ;
a.cc:18:4: error: expected primary-expression before '}' token
   18 |    }
      |    ^
a.cc:17:4: error: expected ';' before '}' token
   17 |   }
      |    ^
      |    ;
   18 |    }
      |    ~
a.cc:18:4: error: expected primary-expression before '}' token
   18 |    }
      |    ^
a.cc:17:4: error: expected ')' before '}' token
   17 |   }
      |    ^
      |    )
   18 |    }
      |    ~
a.cc:15:7: note: to match this '('
   15 |   for (N){
      |       ^
a.cc:18:4: error: expected primary-expression before '}' token
   18 |    }
      |    ^
Language: Java

import java.util.*;
import java.lang.*;

public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        String t = sc.nextLine();
        String result = new String();
        for(int i = 0;i<s.length();i++){
            result.concat(new String(s.charAt(i)));
            result.concat(new String(t.charAt(i)));
        }
        System.out.println(result);
        sc.close();
    }
}

Compiler output:
Main.java:11: error: no suitable constructor found for String(char)
            result.concat(new String(s.charAt(i)));
                          ^
    constructor String.String(String) is not applicable
      (argument mismatch; char cannot be converted to String)
    constructor String.String(char[]) is not applicable
      (argument mismatch; char cannot be converted to char[])
    constructor String.String(byte[]) is not applicable
      (argument mismatch; char cannot be converted to byte[])
    constructor String.String(StringBuffer) is not applicable
      (argument mismatch; char cannot be converted to StringBuffer)
    constructor String.String(StringBuilder) is not applicable
      (argument mismatch; char cannot be converted to StringBuilder)
Main.java:12: error: no suitable constructor found for String(char)
            result.concat(new String(t.charAt(i)));
                          ^
    constructor String.String(String) is not applicable
      (argument mismatch; char cannot be converted to String)
    constructor String.String(char[]) is not applicable
      (argument mismatch; char cannot be converted to char[])
    constructor String.String(byte[]) is not applicable
      (argument mismatch; char cannot be converted to byte[])
    constructor String.String(StringBuffer) is not applicable
      (argument mismatch; char cannot be converted to StringBuffer)
    constructor String.String(StringBuilder) is not applicable
      (argument mismatch; char cannot be converted to StringBuilder)
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
2 errors
Language: Java

import java.util.*;
lass Main{
	public static void main(String[] $){
		Scanner s=new Scanner(System.in);
		int n=s.nextInt();
		String a=s.next(),b=s.next();
		char[]c=new char[n*2];
		for(int i=0;i<n;++i) {
			c[i*2]=a.charAt(i);
			c[i*2+1]=b.charAt(i);
		}
		System.out.println(c);
	}
}

Compiler output:
Main.java:2: error: class, interface, enum, or record expected
lass Main{
^
Main.java:3: error: unnamed classes are a preview feature and are disabled by default.
	public static void main(String[] $){
	              ^
  (use --enable-preview to enable unnamed classes)
Main.java:14: error: class, interface, enum, or record expected
}
^
3 errors
Language: C++

#include <iostream>
#include <string>
 using namespace std;
int main()
{
  int n;
  cin >> n;
	string s,t;
  cin >> s >> t;
  string new;
  for(size_t i=0; i<s.length();i++)
  {
  	new+=s[i]+t[i];
  }
  cout << new << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:10: error: expected unqualified-id before 'new'
   10 |   string new;
      |          ^~~
a.cc:13:12: error: expected type-specifier before '+=' token
   13 |         new+=s[i]+t[i];
      |            ^~
a.cc:15:15: error: expected type-specifier before '<<' token
   15 |   cout << new << endl;
      |               ^~
Language: C

#include<stdio.h>

int main(void)
{
  int m,i;
  scanf("%d,&m);
  char *cadena1[m],*cadena2[m];
  scanf("%s",cadena1);
  scanf("%s",cadena2);
  for(i=0,i<m,i++)
        {
          prinft("%s",cadena1[i]);
          prinft("%s",cadena2[i]);
        }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:9: warning: missing terminating " character
    6 |   scanf("%d,&m);
      |         ^
main.c:6:9: error: missing terminating " character
    6 |   scanf("%d,&m);
      |         ^~~~~~~~
main.c:7:3: error: expected expression before 'char'
    7 |   char *cadena1[m],*cadena2[m];
      |   ^~~~
main.c:15:12: error: expected ';' before '}' token
   15 |   return 0;
      |            ^
      |            ;
   16 | }
      | ~
Language: C++

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=1e5+50;
const int mod=1e9+7;
using namespace std;
int n,i1,i2,s[nmax],t[nmax],i;
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n;
	for(i=1;i<=n;i++)cin>>s[i];
	for(i=1;i<=n;i++)cin>>t[i];
	for(i=1;i<=2*n;i++)
	{
		if(i&1)cout<<s[++i1];
		else cout<<c[++i2];
	}
	cout<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:28: error: 'c' was not declared in this scope
   34 |                 else cout<<c[++i2];
      |                            ^
Language: C++

#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include <bits/stdc++.h>
#define rc(x) return cout<<x<<endl,0
#define pb push_back
#define mkp make_pair
#define in insert
#define er erase
#define fd find
#define fr first
#define sc second
typedef long long ll;
typedef long double ld;
const ll INF=0x3f3f3f3f3f3f3f3f;
const ll llinf=(1LL<<62);
const int inf=(1<<30);
const int nmax=1e5+50;
const int mod=1e9+7;
using namespace std;
int n,i1,i2,s[nmax],t[nmax];
int main()
{
	//freopen("sol.in","r",stdin);
	//freopen("sol.out","w",stdout);
	//mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
	ios_base::sync_with_stdio(false);cin.tie(0);cerr.tie(0);cout.tie(0);
	cin>>n;
	for(i=1;i<=n;i++)cin>>s[i];
	for(i=1;i<=n;i++)cin>>t[i];
	for(i=1;i<=2*n;i++)
	{
		if(i&1)cout<<s[++i1];
		else cout<<c[++i2];
	}
	cout<<endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:29:13: error: 'i' was not declared in this scope
   29 |         for(i=1;i<=n;i++)cin>>s[i];
      |             ^
a.cc:30:13: error: 'i' was not declared in this scope
   30 |         for(i=1;i<=n;i++)cin>>t[i];
      |             ^
a.cc:31:13: error: 'i' was not declared in this scope
   31 |         for(i=1;i<=2*n;i++)
      |             ^
a.cc:34:28: error: 'c' was not declared in this scope
   34 |                 else cout<<c[++i2];
      |                            ^
Language: C

#include <stdio.h>
#include <stdlib.h>
 
int main(void){
    // Your code here!
    char *S;
    char *T;
    int N;

    scanf("%d",&N);

    S = (char *)malloc(sizeof(char)N);
    T = (char *)malloc(sizeof(char)N);

    scanf("%s %s",S,T);

    for(int i=0;i<N;i++){
        printf("%c",S[i]);
        printf("%c",T[i]);
    }

    free(S);
    free(T);
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:12:36: error: expected ')' before 'N'
   12 |     S = (char *)malloc(sizeof(char)N);
      |                       ~            ^
      |                                    )
main.c:13:36: error: expected ')' before 'N'
   13 |     T = (char *)malloc(sizeof(char)N);
      |                       ~            ^
      |                                    )
Language: C

#include <stdio.h>
#include <stdlib.h>
 
int main(void){
    // Your code here!
    char *S;
    char *T;
    int N;

    scanf("%d",&N);

    S = (char )malloc(sizeof(char)N);
    T = (char )malloc(sizeof(char)N);

    scanf("%s %s",S,T);

    for(int i=0;i<N;i++){
        printf("%c",S[i]);
        printf("%c",T[i]);
    }

    free(S);
    free(T);
    return 0;
}


Compiler output:
main.c: In function 'main':
main.c:12:35: error: expected ')' before 'N'
   12 |     S = (char )malloc(sizeof(char)N);
      |                      ~            ^
      |                                   )
main.c:12:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   12 |     S = (char )malloc(sizeof(char)N);
      |         ^
main.c:12:7: error: assignment to 'char *' from 'char' makes pointer from integer without a cast [-Wint-conversion]
   12 |     S = (char )malloc(sizeof(char)N);
      |       ^
main.c:13:35: error: expected ')' before 'N'
   13 |     T = (char )malloc(sizeof(char)N);
      |                      ~            ^
      |                                   )
main.c:13:9: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
   13 |     T = (char )malloc(sizeof(char)N);
      |         ^
main.c:13:7: error: assignment to 'char *' from 'char' makes pointer from integer without a cast [-Wint-conversion]
   13 |     T = (char )malloc(sizeof(char)N);
      |       ^
Language: C++

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

int main(){
  ll n;
  string s,r,ans;
  cin>>n>>s>>t;
  rep(i,n){
  	ans.push_back(s[i]);
  	ans.push_back(t[i]);
  }
  cout<<ans<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: 't' was not declared in this scope
   10 |   cin>>n>>s>>t;
      |              ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:30: error: expected ')' before '{' token
   11 |                 if(i<a.size(){
      |                   ~          ^
      |                              )
a.cc:14:9: error: expected primary-expression before '}' token
   14 |         }
      |         ^
Language: C++

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

int main()
{
  int a,i;
  cin >> a;
  char s[a],t[a];
  
  cin >>s;
  cin >>t;
  
  for(i=0;i<a;i++)
  {
  	pritnf("%c%c",s[i],t[i]);
  }
  return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'pritnf' was not declared in this scope; did you mean 'printf'?
   15 |         pritnf("%c%c",s[i],t[i]);
      |         ^~~~~~
      |         printf
Language: C++

#include <bits/stdc++.h>

int main()
{
  int a,i;
  cin >> a;
  char s[a],t[a];
  
  cin >>s;
  cin >>t;
  
  for(i=0;i<a;i++)
  {
  	pritnf("%c%c",s[i],t[i]);
  }
  return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> 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:14:9: error: 'pritnf' was not declared in this scope; did you mean 'printf'?
   14 |         pritnf("%c%c",s[i],t[i]);
      |         ^~~~~~
      |         printf
Language: C++

#include <bits/stdc++.h>

int main()
{
  int a,i;
  char s[a],t[a];
  cin >> a;
  
  for(i=0;i<a;i++)
  {
  	pritnf("%c%c",s[i],t[i]);
  }
  return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |   cin >> 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:11:9: error: 'pritnf' was not declared in this scope; did you mean 'printf'?
   11 |         pritnf("%c%c",s[i],t[i]);
      |         ^~~~~~
      |         printf
Language: C

#include<stdio.h>
int main(){
  int i;
  int n;
char a[100];
char b[100];
char c[100];
scanf("%d",&n);
  for(i=0;i<n;i++)
    scanf("%c",a[i]);
  for(i=0;i<n;i++)
    scanf("%c",b[i]);
  for(i=0;i<n;i++){
    char c[i]=a[i];
    i++;
    char c[i]=b[i];
  }
  for(i=0;i<2*n;i++)
    printf("%c",c[i]);
  
  return 0;
}
 


Compiler output:
main.c: In function 'main':
main.c:14:15: error: variable-sized object may not be initialized except with an empty initializer
   14 |     char c[i]=a[i];
      |               ^
main.c:16:10: error: redefinition of 'c'
   16 |     char c[i]=b[i];
      |          ^
main.c:14:10: note: previous definition of 'c' with type 'char[i]'
   14 |     char c[i]=a[i];
      |          ^
main.c:16:15: error: variable-sized object may not be initialized except with an empty initializer
   16 |     char c[i]=b[i];
      |               ^
Language: C

#include<stdio.h>
int main(){
  int i;
  int n;
char a[100];
char b[100];
char c[100];
scanf("%d",&n);
  for(i=0;i<n;i++)
    scanf("%s",a[i]);
  for(i=0;i<n;i++)
    scanf("%s",b[i]);
  for(i=0;i<n;i++){
    char c[i]=a[i];
    i++;
    char c[i]=b[i];
  }
  for(i=0;i<2*n;i++)
    printf("%s",c[i]);
  
  return 0;
}
 

Compiler output:
main.c: In function 'main':
main.c:14:15: error: variable-sized object may not be initialized except with an empty initializer
   14 |     char c[i]=a[i];
      |               ^
main.c:16:10: error: redefinition of 'c'
   16 |     char c[i]=b[i];
      |          ^
main.c:14:10: note: previous definition of 'c' with type 'char[i]'
   14 |     char c[i]=a[i];
      |          ^
main.c:16:15: error: variable-sized object may not be initialized except with an empty initializer
   16 |     char c[i]=b[i];
      |               ^
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>

int main(){
	int n;
	string s, t;
	std::cin >> n >> s >> t;
	for(int i=0; i<n; i++){
		std::cout << s[i];
		std::cout << t[i];
	}
	std::cout << std::endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'string' was not declared in this scope
    7 |         string s, t;
      |         ^~~~~~
a.cc:7:9: 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:8:26: error: 's' was not declared in this scope
    8 |         std::cin >> n >> s >> t;
      |                          ^
a.cc:8:31: error: 't' was not declared in this scope
    8 |         std::cin >> n >> s >> t;
      |                               ^
Language: C++

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

int main(){
  int n;
  string s, t;
  cin >> n >> s >> t;
  for(int i=0; i<n; i++){
    cout << s.size(i);
    cout << t.size(i);
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
   10 |     cout << s.size(i);
      |             ~~~~~~^~~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:1076:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 1076 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note:   candidate expects 0 arguments, 1 provided
a.cc:11:19: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
   11 |     cout << t.size(i);
      |             ~~~~~~^~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 1076 |       size() const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:1076:7: note:   candidate expects 0 arguments, 1 provided
Language: C++

#include<iostream>
using namespace std;

int main(){
    int n=100,i,j,k;
  　scanf("%d",&n);
    char s[n],t[n],u[2*n];
    scanf("%s",s);
    scanf("%s",t);


    for(i=0;i<=n;i++){
        u[i*2] = s[i];
    }

    for(j=1;j<=n;j++) {
        u[(j * 2) - 1] = t[j - 1];
    }

    for(k=0;k<=2*n;k++){
        cout << u[k];
    }

    return 0;
}

Compiler output:
a.cc:6:3: error: extended character 　 is not valid in an identifier
    6 |   　scanf("%d",&n);
      |   ^
a.cc: In function 'int main()':
a.cc:6:3: error: '\U00003000scanf' was not declared in this scope; did you mean 'wscanf'?
    6 |   　scanf("%d",&n);
      |   ^~~~~~~
      |   wscanf
Language: C++

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

int main() {
  int N;
  cin >> N;
  vector<string> A(N);
  vector<string> B(N);
  
  for (int i = 0; i < N; i++){
    cin >> A.at(i);
  }
  for (int i = 0; i < N; i++){
    cin >> B.at(i);
  }
  vector<string> vec (2*N);
  for ( int i = 0;i<N;i++){
    
  }
  for ( int i = 0;i<N;i++){
    vec.at(2*i-1) = A.at(i);
    vec.at(2*n) = B.at(i);
  }
  for (int i=0;i<N;i++){
    cout<<vec.at(i);
  }
  cout << endl;
}
  
  


Compiler output:
a.cc: In function 'int main()':
a.cc:22:14: error: 'n' was not declared in this scope
   22 |     vec.at(2*n) = B.at(i);
      |              ^
Language: C


#include<stdio.h>
int main(void){
  int i,n,dn,inc,inc2;
  char str;

  scanf("%d",&n);
  dn = n * 2;

  char s[100],t[100],ans[200];

  scanf("%s",s);
  scanf("%s",t);
  inc = 0;
  inc2 = 1;
  for(i = 0; i < dn; i ++){
    if(i%2 == 0){
      ans[i] = s[i - inc];
      inc ++;
    }else{
      ans[i] = t[i - inc2];
      inc2 ++;
    }
}
  printf("%s",ans);
return ans;
}
1
#include<stdio.h>
2
int main(void){
3
  int i,n,dn,inc,inc2;
4
  

Compiler output:
main.c: In function 'main':
main.c:26:8: error: returning 'char *' from a function with return type 'int' makes integer from pointer without a cast [-Wint-conversion]
   26 | return ans;
      |        ^~~
main.c: At top level:
main.c:28:1: error: expected identifier or '(' before numeric constant
   28 | 1
      | ^
Language: C++

#include <iostream>
using namespace std;

int main(){
    int c;
    string a,b,d;
    cin >> c >> a >> b;
    for(int i = 0;i < c*2; i++){
        if (i % 2 == 0){
            d.at(i) = a.at(i);
        }
        else{
            d.at(i) = b.at(i)
        }
    }
    cout << d << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:30: error: expected ';' before '}' token
   13 |             d.at(i) = b.at(i)
      |                              ^
      |                              ;
   14 |         }
      |         ~
Language: C++

#include <iostream>
using namespace std;

int main(){
    int c;
    string a,b,d;
    cin >> c >> a >> b;
    for(int i = 0;i < c; i++){
        if (i % 2 == 0){
            d.at(i) = a.at(i);
        }
        else{
            d.at(i) = b.at(i)
        }
    }
    cout << d << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:30: error: expected ';' before '}' token
   13 |             d.at(i) = b.at(i)
      |                              ^
      |                              ;
   14 |         }
      |         ~
Language: C

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

void main()
{
	char a[256],b[256],c[512];
	int* i,j,N;
	scanf("%d",N);
	scanf("%s",a);
	scanf("%s",b);
	for(i=0;;++i)
	{
	j=c[2*i]=a[i];
	c[2*i+1]=b[i];
	if(j == '\0')
	break;
	}
	printf("%s\n",c);
	return 0;
	}


Compiler output:
main.c: In function 'main':
main.c:13:14: error: invalid operands to binary * (have 'int' and 'int *')
   13 |         j=c[2*i]=a[i];
      |              ^
main.c:13:19: error: array subscript is not an integer
   13 |         j=c[2*i]=a[i];
      |                   ^
main.c:14:12: error: invalid operands to binary * (have 'int' and 'int *')
   14 |         c[2*i+1]=b[i];
      |            ^
main.c:14:19: error: array subscript is not an integer
   14 |         c[2*i+1]=b[i];
      |                   ^
main.c:19:16: error: 'return' with a value, in function returning void [-Wreturn-mismatch]
   19 |         return 0;
      |                ^
main.c:4:6: note: declared here
    4 | void main()
      |      ^~~~