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

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

int main() {
  striing s, t;
  cin >> s >> t;
  if(s.size() > t.size()){
    for(int i = 0; i < t.size();++i){
      cout << s.at(i) << t.at(i);
    }
    cout << s.at(s.size()-1) << endl;
  } else if(s.size() < t.size()){
    for(int i = 0; i < s.size(); ++i){
      cout << s.at(i) << t.at(i);
    }
    cout << t.at(t.size()) << endl;
  } else {
    for(int i = 0; i < s.size(); ++i){
      cout << s.at(i) << t.at(i);
    }
    cout << endl;
  }
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'striing' was not declared in this scope
    5 |   striing 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: C

#include<stdio.h>
int main()
{
	char o[55],e[55];

	scanf("%s%s",o,e);

	for(i=0;o[i];i++){
		putchar(o[i]);
		if(e[i])
			putchar(e[i]);
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:8:13: error: 'i' undeclared (first use in this function)
    8 |         for(i=0;o[i];i++){
      |             ^
main.c:8:13: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string O,E;
  cin >> O >> E;
  reverse(O.begin(),O.end());
  reverse(E.begin(),E.end());
  for (int i = 1; !O.empty() || E.empty(); i++) {
    if (i%2) {
      cout << O.back();
      O.pop_back();'
    } else {
      cout << E.back();
      E.pop_back();
    }
  }
}

Compiler output:
a.cc:11:20: warning: missing terminating ' character
   11 |       O.pop_back();'
      |                    ^
a.cc:11:20: error: missing terminating ' character
Language: Java

import java.util.*;

public class Main{
	
  public static void main(String[] args){
    Scanner sc = new Scanner(System.in);
  	char[] o=sc.next().toCharArray(),e=sc.next().toCharArray();
    String s="";
    for(int i=0;i<o.length;i++){
      if(i=e.length){
        s+=o[i];
      }else{
        s+=o[i];
        s+=e[i];
      }
    }
    System.out.println(s);
  }
}


Compiler output:
Main.java:10: error: incompatible types: int cannot be converted to boolean
      if(i=e.length){
          ^
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string O,E;cin>>O>>E;
  for(int i=0;i<O.size();i++){
    cout << O.at(i)<<(i<E.size()?E.at(i):"");
  }
  cout<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:33: error: operands to '?:' have different types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} and 'const char*'
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):"");
      |                       ~~~~~~~~~~^~~~~~~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string O,E;cin>>O>>E;
  for(int i=0;i<O.size();i++){
    cout << O.at(i)<<(i<E.size()?E.at(i):'');
  }
  cout<<endl;
}

Compiler output:
a.cc:6:42: error: empty character constant
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):'');
      |                                          ^~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string O,E;cin>>O>>E;
  for(int i=0;i<O.size();i++){
    cout << O.at(i)<<(i<E.size()?E.at(i):endl;);
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:42: error: overloaded function with no contextual type information
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):endl;);
      |                                          ^~~~
a.cc:6:46: error: expected ')' before ';' token
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):endl;);
      |                      ~                       ^
      |                                              )
a.cc:6:47: error: expected primary-expression before ')' token
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):endl;);
      |                                               ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  string O,E;cin>>O>>E;
  for(int i=0;i<O.size();i++){
    cout << O.at(i)<<(i<E.size()?E.at(i):endl);
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:42: error: overloaded function with no contextual type information
    6 |     cout << O.at(i)<<(i<E.size()?E.at(i):endl);
      |                                          ^~~~
Language: C++

#include <bits.stdc++.h>
using namespace std;
int main(){
  string O,E;cin>>O>>E;
  for(int i=0;i<O.size();i++){
    cout << O.at(i)<<(i<E.size()?E.at(i):endl);
  }
}

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

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

int main() {
  string o;
  string e;
  cin >> o >> e;
  
  string s;
  for(int i=0; i<e.size.(); i++){
    s += o.at(i);
    s += e.at(i);
  }
  
  if(o.size() != e.size()){
    s += o.at(o.size()-1);
  }
  
  cout << s << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:20: error: invalid use of member function '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]' (did you forget the '()' ?)
   10 |   for(int i=0; i<e.size.(); i++){
      |                  ~~^~~~
      |                        ()
Language: C++

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

int main() {
  string o;
  string e;
  cin >> o >> e;
  
  string s;
  for(int i=0; i<e.size.(); i++){
    s += o.at(i);
    s += e.at(i);
  }
  
  if(o.size() != e.size()){
    s += o.at(o.size()-1)
  }
  
  cout << s << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:20: error: invalid use of member function '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]' (did you forget the '()' ?)
   10 |   for(int i=0; i<e.size.(); i++){
      |                  ~~^~~~
      |                        ()
a.cc:16:26: error: expected ';' before '}' token
   16 |     s += o.at(o.size()-1)
      |                          ^
      |                          ;
   17 |   }
      |   ~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:12:4: error: expected '}' at end of input
   12 |   }
      |    ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main()
{
  string o, e;
  cin >> o >> e;
  for(int i = 0; i < min(o.size(), e.size()); i++)
  {
    ans = o[i] + e[i] + ans;
  }
  if(o.size() > e.size())
    ans = ans + o[o.size() - 1];
  else 
  if(o.size() < e.size())
    ans = ans + e[e.size() - 1];
  cout << ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   10 |     ans = o[i] + e[i] + ans;
      |     ^~~
      |     abs
a.cc:13:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   13 |     ans = ans + o[o.size() - 1];
      |     ^~~
      |     abs
a.cc:16:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   16 |     ans = ans + e[e.size() - 1];
      |     ^~~
      |     abs
a.cc:17:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   17 |   cout << ans;
      |           ^~~
      |           abs
Language: C++

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

int main() {
  string O,E;
  cin >> O >> E;
  for (int i=0; i<O.size()+E.size(); i++) {
      if (i%==0) cout << O.at(i/2);
      else cout << E.at(i/2);
  }
  cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: expected primary-expression before '=' token
    8 |       if (i%==0) cout << O.at(i/2);
      |              ^
Language: C++

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

int main() {
  string O,E; cin>>O>>E;
  for(int i=0;;i++){
    if(O.size()==E.size()){
      cout << O[i] << E[i];
      if(i >= O.size()-1){
        cout << endl;
        break;
      }
    }
    else{
      cout << O[i] << E[i];
      if(i >= E.size()-1){
        cout << O[i+1] << endl;
        break;
      }
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:24:2: error: expected '}' at end of input
   24 | }
      |  ^
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
Language: C++

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

int main() {
  string O,E; cin>>O>>E;
  for(int i=0;;i++){
    if(O.size()==E.size()){
      cout << O[i] << E[i];
      if(i >= O.size()-1){
        cout << endl;
        break;
      }
    }
    else{
      cout << O[i] << E[i];
      if(i >= E.size()-1){
        cout << O[i+] << endl;
        break;
      }
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:20:21: error: expected primary-expression before ']' token
   20 |         cout << O[i+] << endl;
      |                     ^
a.cc:24:2: error: expected '}' at end of input
   24 | }
      |  ^
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
Language: C++

#include<iostream>
#include<vector>
#include<string>
using namespace std;
int main()
{
    int k = 0;
    string O, E, s = "";
    string p[100];
    cin >> O >> E;
    if(O.size() >= E.size())
    {
        a = O.size();
        b = E.size();
    }
    else
    {
        a = E.size();
        b = O.size();
    }
    for(int i = 1; i <= 2 * a; i++)
    {
        if(i % 2 == 1)
        p[i - 1] = O[k];
        k++;
        cout << p[i] << " ";
    }
    cout << endl;

    k = 0;
    for(int i = 1; i <= 2 * a; i++)
    {
        if(i % 2 == 0)
        p[i - 1] = E[k];
        k++;
    }
    for(int i = 1; i <= 2 * a; i++)
    {
        s = s + p[i - 1];
    }
    for(int i = a; i <= b; i++)
    {
        p[i] = max()
    }
    cout << s;
    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:9: error: 'a' was not declared in this scope
   13 |         a = O.size();
      |         ^
a.cc:14:9: error: 'b' was not declared in this scope
   14 |         b = E.size();
      |         ^
a.cc:18:9: error: 'a' was not declared in this scope
   18 |         a = E.size();
      |         ^
a.cc:19:9: error: 'b' was not declared in this scope
   19 |         b = O.size();
      |         ^
a.cc:21:29: error: 'a' was not declared in this scope
   21 |     for(int i = 1; i <= 2 * a; i++)
      |                             ^
a.cc:31:29: error: 'a' was not declared in this scope
   31 |     for(int i = 1; i <= 2 * a; i++)
      |                             ^
a.cc:37:29: error: 'a' was not declared in this scope
   37 |     for(int i = 1; i <= 2 * a; i++)
      |                             ^
a.cc:41:17: error: 'a' was not declared in this scope
   41 |     for(int i = a; i <= b; i++)
      |                 ^
a.cc:41:25: error: 'b' was not declared in this scope
   41 |     for(int i = a; i <= b; i++)
      |                         ^
a.cc:43:19: error: no matching function for call to 'max()'
   43 |         p[i] = max()
      |                ~~~^~
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 0 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 0 provided
Language: C++

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


int main(){
  string O, E;
  cin >>O >> E;
  
  
  rep(i, E.size()){
     cout << O[i] << E[i];
  }
  
  if(O.size() > E.size()){
    cout << O[O.size()-1];
  }
  cout << endl;
}
 
    
 
  
  
 
}
      

Compiler output:
a.cc:26:1: error: expected declaration before '}' token
   26 | }
      | ^
Language: C++

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

int main(){
  string O, E;
  cin>>O>>E;
  int Z=O.size()+E.size();
  for(int i=0; i<Z; i++){
    if(i%2==0) cout<<O.at(i/2);
    else(i%2==1) cout<<E.at((i-1)/2);
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:17: error: expected ';' before 'cout'
   10 |     else(i%2==1) cout<<E.at((i-1)/2);
      |                 ^~~~~
      |                 ;
Language: C++

#incluce <string>
#include <iostream>
using namespace std;
int main(){
  string a,b; cin >> a >> b;
  string ans;
  for(int i=0;i<b.length();i++){
    ans += a[i]+b[i];
  }
  if(a.length()!=b.length()) ans+=a[a.length()-1];
  cout << ans << endl;
}

Compiler output:
a.cc:1:2: error: invalid preprocessing directive #incluce; did you mean #include?
    1 | #incluce <string>
      |  ^~~~~~~
      |  include
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:29: error: no matching function for call to 'size()'
    7 |     for (int i = 0; i < size(); i++){
      |                         ~~~~^~
In file included from /usr/include/c++/14/string:53,
                 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/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
    ll a,b,p;
    string s,ss;
    vector<string>v;
    cin>>s>>ss;
    //a=s.size(); b=ss.size();
    sss=s+ss;
    p=sss.size();
    for(ll i=0;i<p;i++)
    {
        cout<<s[i]; cout<<ss[i];
    }
}


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

#include<stdio.h>
#include<string.h>
int main()
{
        char a[10000],b[10000];
        gets(a);
        gets(b);
        int i,j,len1,len2;
        len1=strlen(a);
        len2=strlen(b);
        for(i=0,j=0;i<len1,j<len2;i=i+1,j=j+1)
        {
                printf("%c",a[i]);
                printf("%c",b[i]);
                if(i==len-1)
                        printf("\n");
        }
        return 0;
}


Compiler output:
main.c: In function 'main':
main.c:6:9: error: implicit declaration of function 'gets'; did you mean 'fgets'? [-Wimplicit-function-declaration]
    6 |         gets(a);
      |         ^~~~
      |         fgets
main.c:15:23: error: 'len' undeclared (first use in this function); did you mean 'len2'?
   15 |                 if(i==len-1)
      |                       ^~~
      |                       len2
main.c:15:23: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

//#define _GLIBCXX_DEBUG

#include<bits/stdc++.h>
#define PI 3.14159265359
using namespace std;
#define rep(i, n) for (ll i = 0; i < (ll)(n); i++)
const int INF= 1e9+5;
typedef long long ll;
typedef vector<ll> vl;
typedef vector<vector<ll> >vvl;
typedef pair<ll,ll> P;
typedef tuple<ll,ll,ll> T;
const ll MOD=1000000007LL;
string abc="abcdefghijklmnopqrstuvwxyz";
string ABC="ABCDEFGHIJKLMNOPQRSTUVWXYZ";

int main(){
  ll string a,b;cin>>a>>b;
  rep(i,a.size())cout<<a[i]<<b[i];
  cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:13: error: expected initializer before 'a'
   18 |   ll string a,b;cin>>a>>b;
      |             ^
a.cc:18:22: error: 'a' was not declared in this scope
   18 |   ll string a,b;cin>>a>>b;
      |                      ^
a.cc:18:25: error: 'b' was not declared in this scope
   18 |   ll string a,b;cin>>a>>b;
      |                         ^
Language: C++

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

int main(){
  string o,e;
  cin >> o >> e;
  int e = o.size();
  for(int i = 0; i < l; i++){
    cout<<o.at(i)<<e.at(i);
  }
  if(l<o.size())cout<<o.at(l);
  cout<<endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:7: error: conflicting declaration 'int e'
    7 |   int e = o.size();
      |       ^
a.cc:5:12: note: previous declaration as 'std::string e'
    5 |   string o,e;
      |            ^
a.cc:8:22: error: 'l' was not declared in this scope
    8 |   for(int i = 0; i < l; i++){
      |                      ^
a.cc:11:6: error: 'l' was not declared in this scope
   11 |   if(l<o.size())cout<<o.at(l);
      |      ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
     char a[100],b[100];
     int num1=0;
     int num2=0;
     cin>>a;
     cin>>b;
     for(int i=0;i<(a.size()+b.size());i++)
     {
         if(i%2)
             cout<<b[num1++];
         else
             cout<<a[num2++];
        
     }
     cout<<endl;
     return 0;
 }

Compiler output:
a.cc: In function 'int main()':
a.cc:10:23: error: request for member 'size' in 'a', which is of non-class type 'char [100]'
   10 |      for(int i=0;i<(a.size()+b.size());i++)
      |                       ^~~~
a.cc:10:32: error: request for member 'size' in 'b', which is of non-class type 'char [100]'
   10 |      for(int i=0;i<(a.size()+b.size());i++)
      |                                ^~~~
Language: C++

 #include<bits/stdc++.h>
  using namespace std;
  typedef long long ll;
 string s1,s2,s3;
  int main()
  {
      int num1=0;
      int num2=0;
      cin>>s1;
     cin>>s2;
     for(int i=0;i<s1.size()+s2.size();i++)
     {
         if(i%2)
         {
             cout<<s2[num1++];
         }
         else
         {
           cout<<s1[num2++];
       }

Compiler output:
a.cc: In function 'int main()':
a.cc:20:9: error: expected '}' at end of input
   20 |        }
      |         ^
a.cc:12:6: note: to match this '{'
   12 |      {
      |      ^
a.cc:20:9: error: expected '}' at end of input
   20 |        }
      |         ^
a.cc:6:3: note: to match this '{'
    6 |   {
      |   ^
Language: C++

 #include<bits/stdc++.h>
typedef long long ll;
  string s1,s2,s3;
  int main()
  {
      int num1=0;
      int num2=0;
      cin>>s1;
     cin>>s2;
     for(int i=0;i<s1.size()+s2.size();i++)
     {
         if(i%2)
         {
             cout<<s2[num1++];
         }
         else
         {
             cout<<s1[num2++];
         }
     }
     cout<<endl;
     return 0;
 }


Compiler output:
a.cc:3:3: error: 'string' does not name a type; did you mean 'stdin'?
    3 |   string s1,s2,s3;
      |   ^~~~~~
      |   stdin
a.cc: In function 'int main()':
a.cc:8:7: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    8 |       cin>>s1;
      |       ^~~
      |       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:8:12: error: 's1' was not declared in this scope; did you mean 'y1'?
    8 |       cin>>s1;
      |            ^~
      |            y1
a.cc:9:11: error: 's2' was not declared in this scope
    9 |      cin>>s2;
      |           ^~
a.cc:14:14: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |              cout<<s2[num1++];
      |              ^~~~
      |              std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:14: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |              cout<<s1[num2++];
      |              ^~~~
      |              std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:21:6: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |      cout<<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:21:12: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   21 |      cout<<endl;
      |            ^~~~
      |            std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

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

int main(){
    char O[51], E[51], password[101];
    cin>>O>>E;
    char *o = O;
    char *e = E;
    char *p = password;
    for(int i = 0; i < strlen(O) + strlen(E); i++){
        *p++ = *o++;
        *p++ = *e++;
        *p = '\0';
    }
    cout<<password;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:24: error: 'strlen' was not declared in this scope
   11 |     for(int i = 0; i < strlen(O) + strlen(E); i++){
      |                        ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | #include<string>
Language: C++

#include<iostream>
using namespace std;

int main(){
    char O[51], E[51], password[101];
    cin>>O>>E;
    char *o = O;
    char *e = E;
    char *p = password;
    for(int i = 0; i < strlen(O) + strlen(E); i++){
        *p++ = *o++;
        *p++ = *e++;
        *p = '\0';
    }
    cout<<password;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: 'strlen' was not declared in this scope
   10 |     for(int i = 0; i < strlen(O) + strlen(E); i++){
      |                        ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std;
Language: C++

#include<bits/stdc++.h>
using namespace std;
void password(char o[],char e[])
{
    char p[100];
    int l=0,m=0;
    l=strlen(o);
    m=strlen(e);
    for(int i=0,j=0,k=0;i<l+m;i++)
    {
        if(i%2==0)
        {
            p[i]=o[j];
            j++;
        }
        else
        {
            p[i]=e[k];
            k++;
        }
    }
    p[l+m]='\0';
    cout<<p;
}
int main()
{
    char o[50],e[50];
    gets(o);
    gets(e);
    password(o,e);
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:5: error: 'gets' was not declared in this scope; did you mean 'getw'?
   28 |     gets(o);
      |     ^~~~
      |     getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
char a[100], b[100], c[100];
int i, j, m,n,t;
gets(a);
gets(b);
m=strlen(a);
n=strlen(b);
if(m=n)
t=2n;
else
t=m+n;
for(i=0;i<t;i++)
{ 
if((i+1)%2==0)
 c[i]=a[i];
else
c[i]=b[i];
}
c[t]='\0';
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 | gets(a);
      | ^~~~
      | getw
a.cc:12:3: error: unable to find numeric literal operator 'operator""n'
   12 | t=2n;
      |   ^~
Language: C++

#include<bits/stdc++.c>
using namespace std;
int main()
{
char a[100], b[100], c[100];
int i, j, m,n,t;
gets(a);
gets(b);
m=strlen(a);
n=strlen(b);
if(m=n)
t=2n;
else
t=m+n;
for(i=0;i<t;i++)
{ 
if((i+1)%2==0)
 c[i]=a[i];
else
c[i]=b[i];
}
c[t]='\0';
return 0;
}

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

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

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

	cin>>a;
cin>>b;
int i=0,j=0;

while(i<a.length() || j<b.length())
{
	s+=a[i];
	s+=b[j];
	i=i+1;
	j=j+1;
}

cout<<s;
return s;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:8: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int' in return
   22 | return s;
      |        ^
      |        |
      |        std::string {aka std::__cxx11::basic_string<char>}
Language: C++

#include<string>
using namespace std;
int main()
{
int main()
{
	string a,b,s;

	cin>>a;
cin>>b;
int i=0,j=0;

while(i<a.length() || j<b.length())
{
	s+=a[i];
	s+=b[j];
	i=i+1;
	j=j+1;
}

cout<<s;
return s;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
    5 | int main()
      |         ^~
a.cc:5:9: note: remove parentheses to default-initialize a variable
    5 | int main()
      |         ^~
      |         --
a.cc:5:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:6:1: error: a function-definition is not allowed here before '{' token
    6 | {
      | ^
a.cc:23:2: error: expected '}' at end of input
   23 | }
      |  ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

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

int main(){
 long int l1,l2;
 string o,e;
 cin>>o>>e;
 long int l = min(o.size(), e.size());
 long int i=0
 for(i=0;i<l;i++){
     cout<<o[i]<<e[i];
 }
 if(o.size()>l)
    cout<<o[i];
 else if(e.size()>l)
    cout<<e[i];
 return 0;    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:2: error: expected ',' or ';' before 'for'
   12 |  for(i=0;i<l;i++){
      |  ^~~
a.cc:12:17: error: expected ';' before ')' token
   12 |  for(i=0;i<l;i++){
      |                 ^
      |                 ;
Language: C++

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

int main(){
 long int l1,l2;
 string o,e;
 cin>>o>>e;
 long int l = min(o.size(), e.size());
 for(long int i=0;i<l;i++){
     cout<<o[i]<<e[i];
 }
 if(o.size()>l)
    cout<<o[i];
 else if(e.size()>l)
    cout<<e[i];
 return 0;    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:13: error: 'i' was not declared in this scope
   15 |     cout<<o[i];
      |             ^
a.cc:17:13: error: 'i' was not declared in this scope
   17 |     cout<<e[i];
      |             ^
Language: C++

#include<iostream>
#include<string>
using namespace std;
int main()
{
	string a,b,s;

	cin>>a;
cin>>b;
int i=0,j=0;

while(i<a.length() && j<b.length())
{
	s+=a[i];
	s+=b[j];
	i=i+1;
	j=j+1;
}

cout<<s;
return s;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:8: error: cannot convert 'std::string' {aka 'std::__cxx11::basic_string<char>'} to 'int' in return
   21 | return s;
      |        ^
      |        |
      |        std::string {aka std::__cxx11::basic_string<char>}
Language: C++

#include<iostream>
#include<string>
int main()
{
	string a,b,s;

	cin>>a;
cin>>b;
int i=0,j=0;

while(i<a.length() && j<b.length())
{
	s+=a[i];
	s+=b[j];
	i=i+1;
	j=j+1;
}

cout<<s;
return s;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'string' was not declared in this scope
    5 |         string a,b,s;
      |         ^~~~~~
a.cc:5:9: 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:7:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    7 |         cin>>a;
      |         ^~~
      |         std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:7:14: error: 'a' was not declared in this scope
    7 |         cin>>a;
      |              ^
a.cc:8:6: error: 'b' was not declared in this scope
    8 | cin>>b;
      |      ^
a.cc:13:9: error: 's' was not declared in this scope
   13 |         s+=a[i];
      |         ^
a.cc:19:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   19 | cout<<s;
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:19:7: error: 's' was not declared in this scope
   19 | cout<<s;
      |       ^
Language: C++

#include<iostream>
int main()
{
	string a,b,s;

	cin>>a;
cin>>b;
int i=0,j=0;

while(i<a.length() && j<b.length())
{
	s+=a[i];
	s+=b[j];
	i=i+1;
	j=j+1;
}

cout<<s;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:9: error: 'string' was not declared in this scope
    4 |         string a,b,s;
      |         ^~~~~~
a.cc:4:9: 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:6:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |         cin>>a;
      |         ^~~
      |         std::cin
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:14: error: 'a' was not declared in this scope
    6 |         cin>>a;
      |              ^
a.cc:7:6: error: 'b' was not declared in this scope
    7 | cin>>b;
      |      ^
a.cc:12:9: error: 's' was not declared in this scope
   12 |         s+=a[i];
      |         ^
a.cc:18:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 | cout<<s;
      | ^~~~
      | std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:7: error: 's' was not declared in this scope
   18 | cout<<s;
      |       ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main() {
  string o,e;
  cin >> o >> e;
  os = o.size();
  es = e.size();
  string ans = "";
  for (int i = 0; i < os + es; i++) {
    if (i % 2 == 1) ans += e[i / 2];
    else ans += o[i / 2];  
  }
  cout << ans << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'os' was not declared in this scope; did you mean 'o'?
    6 |   os = o.size();
      |   ^~
      |   o
a.cc:7:3: error: 'es' was not declared in this scope; did you mean 'e'?
    7 |   es = e.size();
      |   ^~
      |   e
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define rep2(i, a, n) for(ll i = a; i < (ll)(n); i++)
#define memi cout << endl
#define kono(n) cout << fixed << setprecision(n)
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define hina cout << ' '
#define in(n) cin >> n
#define in2(n, m) cin >> n >> m
#define in3(n, m, l) cin >> n >> m >> l
#define out(n) cout << n
const ll mei = (ll)1e9 + 7;

int main(){
  string s, t;
  in2(s, t);
  ll a = 0;
  ll d;
  rep(i, s.size() + t.size());
  d = i;
  if(a == 0){
    out(s[d / 2]);
    a++;
  }
  else{
    out(t[d / 2]);
    a--;
  }
  memi;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:7: error: 'i' was not declared in this scope
   23 |   d = i;
      |       ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0; i < (ll)(n); i++)
#define rep2(i, a, n) for(ll i = a; i < (ll)(n); i++)
#define memi cout << endl
#define kono(n) cout << fixed << setprecision(n)
#define all(c) (c).begin(), (c).end()
#define pb push_back
#define hina cout << ' '
#define in(n) cin >> n
#define in2(n, m) cin >> n >> m
#define in3(n, m, l) cin >> n >> m >> l
#define out(n) cout << n
const ll mei = (ll)1e9 + 7;

int main(){
  string s, t;
  in2(s, t);
  ll a = 0;
  rep(i, s.size() + t.size());
  if(a == 0){
    out(s[i / 2]);
    a++;
  }
  else{
    out(t[i / 2]);
    a--;
  }
  memi;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:11: error: 'i' was not declared in this scope
   23 |     out(s[i / 2]);
      |           ^
a.cc:14:24: note: in definition of macro 'out'
   14 | #define out(n) cout << n
      |                        ^
a.cc:27:11: error: 'i' was not declared in this scope
   27 |     out(t[i / 2]);
      |           ^
a.cc:14:24: note: in definition of macro 'out'
   14 | #define out(n) cout << n
      |                        ^
Language: C++

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

int main() {
    string o,e;
    cin >> o >> e;
    if(o.size()==e.soze()){
        for(int i=0;i<o.size();i++){
            cout << o.at(i) << e.at(i);
        }
        cout << endl;
    }
    else{
        for(int i=0;i<e.size();i++){
            cout << o.at(i) << e.at(i);
        }
        cout << o.at(o.size()-1) << endl;
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:20: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'soze'; did you mean 'size'?
    7 |     if(o.size()==e.soze()){
      |                    ^~~~
      |                    size
Language: C++

#include <bits/stdc++.h>

std::string o, e;

int main(){
std::cin >> o >> e;
std::vector<char> answer(o.size()+e.size());
for(int i = 0; i <o.size()+e.size(); ++i){
	if(i%2){
		answer[i] = o[i/2];
    }
	else{
		answer[i] = e[i/2];
	}
}
for(int i = 0; i < o.size()+e.size(); ++i){
	if(i == o.size()+e.size()-1){
    	cout << answer[i] << endl; 
    }
	else{
    	cout << answer[i];
	}
}
}



Compiler output:
a.cc: In function 'int main()':
a.cc:18:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   18 |         cout << answer[i] << endl;
      |         ^~~~
      |         std::cout
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:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:18:30: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   18 |         cout << answer[i] << endl;
      |                              ^~~~
      |                              std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:21:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   21 |         cout << answer[i];
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

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

int main() {
  string O, E;
  cin >> O >> E;
  int o, e;
  o = O.size();
  e = E.size();
  for (int i = 0; i < e, i++) {
    cout << O.at(i) << E.at(i);
  }
  if (o - e == 1) {
    cout << O.at(o - 1);
  }
  cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:29: error: expected ';' before ')' token
   10 |   for (int i = 0; i < e, i++) {
      |                             ^
      |                             ;
Language: C++

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

int main(){
  
  string O,E;
  
  cin >> O >> E;
  
  for(int i = 0;i < O.size();i ++){

    cout << O[i];
    
    if(i < E.size(i)){
      
      cout << E[i];
    }
  }
    return 0;
  
}

  


Compiler output:
a.cc: In function 'int main()':
a.cc:14:18: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
   14 |     if(i < E.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
Language: C++

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

int main(){
  
  string O,E;
  
  cin >> O >> E;
  
  for(int i = 0;i < O.size();i ++){

    cout << O.at(i);
    
    if(i < E.size(i)){
      
      cout << E.at(i);
    }
  }
    return 0;
  
}

  


Compiler output:
a.cc: In function 'int main()':
a.cc:14:18: error: no matching function for call to 'std::__cxx11::basic_string<char>::size(int&)'
   14 |     if(i < E.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
Language: C++

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

int main()
{
  ios_base::sync_with_stdio(0); cout.tie(0); cin.tie(0);
  string o, e;
  cin >> o >> e;
  
  int a = 0, b = 0;
  for(int i = 0; i < o.size()+e.size(); i++)
  {
    if(i&1)
      cout << e[a++];
    else
      cout << o[b++];
  }
  cout << endl;
  return 0;
}
  

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

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

        for(int i=0;i<s.size();i++)
    {

        cout<<s[i]<<x[i];
    }
     return 0;
    }

    else
    {
        for(int i=0;i<x.size();i++)
    {

        cout<<s[i]<<x[i];
    }
    cout<<s.at(s.size()-1);
    return 0;
    }


Compiler output:
a.cc: In function 'int main()':
a.cc:26:6: error: expected '}' at end of input
   26 |     }
      |      ^
a.cc:3:12: note: to match this '{'
    3 | int main() {
      |            ^
Language: C

#include <iostream>
#include <string>
using namespace std;
int main() {
	char o[50], e[50];
	char s[100];
	cin >> o;
	cin >> e;
	
	int i = 0, j = 0, k = 0;
	while (i < 100) {
		if (i % 2 == 0) {
			s[i] = o[j];
			j++;
		}
		else {
			s[i] = e[k];
			k++;
		}
		i++;
	}
	cout << 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<stdio.h>
int main () {
  char o[51];
  char e[51];
  scanf("%s",o);
  scanf("%s",e);
  int i ;
  for(i=0,i<50,i++){
    printf("%s",o[i]);
    printf("%s",e[i]);
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:19: error: expected ';' before ')' token
    8 |   for(i=0,i<50,i++){
      |                   ^
      |                   ;
a.cc:12:3: error: expected primary-expression before 'return'
   12 |   return 0;
      |   ^~~~~~
a.cc:11:4: error: expected ';' before 'return'
   11 |   }
      |    ^
      |    ;
   12 |   return 0;
      |   ~~~~~~
a.cc:12:3: error: expected primary-expression before 'return'
   12 |   return 0;
      |   ^~~~~~
a.cc:11:4: error: expected ')' before 'return'
   11 |   }
      |    ^
      |    )
   12 |   return 0;
      |   ~~~~~~
a.cc:8:6: note: to match this '('
    8 |   for(i=0,i<50,i++){
      |      ^
Language: C++

#include<stdio.h>
int main () {
  char o[51];
  char e[51];
  scanf("%s",o);
  scanf("%s",e);
  for(i=0,i<50,i++){
    printf("%s",o[i]);
    printf("%s",e[i]);
  }
  return 0;
}
  

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<50,i++){
      |       ^
a.cc:11:3: error: expected primary-expression before 'return'
   11 |   return 0;
      |   ^~~~~~
a.cc:10:4: error: expected ';' before 'return'
   10 |   }
      |    ^
      |    ;
   11 |   return 0;
      |   ~~~~~~
a.cc:11:3: error: expected primary-expression before 'return'
   11 |   return 0;
      |   ^~~~~~
a.cc:10:4: error: expected ')' before 'return'
   10 |   }
      |    ^
      |    )
   11 |   return 0;
      |   ~~~~~~
a.cc:7:6: note: to match this '('
    7 |   for(i=0,i<50,i++){
      |      ^
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for (int i = 0; i < (int)n; i++)
#define all(x) (x).begin(),(x).end()
using namespace std;
typedef long long int ll;
typedef vector<int > vecint;
typedef vector<string > vecstr;
int main()
{
  string o, e;
  cin >> o >> e;
  REP(i,e.size()){
    cout << o[i] << e[i];
  }
  if(o.size != e.size()){
    cout << o[o.size() - 1] << endl;
  }else{
    cout << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:8: error: invalid use of member function '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]' (did you forget the '()' ?)
   15 |   if(o.size != e.size()){
      |      ~~^~~~
      |            ()
Language: C++

#include <iostream>
#include <cstdio>
#include <minmax.h>

using namespace std;

string s1, s2;

int main()
{
	cin >> s1 >> s2;
	cout << s1[0];
	for (int i = 0; i < s1.length() + s2.length(); i++)
		if (i % 2 == 0) cout << s2[i / 2];
		else cout << s1[i / 2 + 1];
	cout << endl;
	return 0;
}

Compiler output:
a.cc:3:10: fatal error: minmax.h: No such file or directory
    3 | #include <minmax.h>
      |          ^~~~~~~~~~
compilation terminated.
Language: C++

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

int main() {

	string N,M;
	cin>>N>>M;
	for(int i=0; i<N.Length();i++)
    {cout<<N.at(i)<<M.at(i);}
  if(N.length()>M.length()){cout<<N.at(N.Length()-1);}
  cout<<endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:8:26: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'Length'; did you mean 'length'?
    8 |         for(int i=0; i<N.Length();i++)
      |                          ^~~~~~
      |                          length
a.cc:10:42: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'Length'; did you mean 'length'?
   10 |   if(N.length()>M.length()){cout<<N.at(N.Length()-1);}
      |                                          ^~~~~~
      |                                          length
Language: C++

#include<iostream>
using namespace std;
int main()
{
	char a[51],b[51];
	gets(a);
	gets(b);
	for(int i=0;i<=strlen(a)-1;i++)
	cout<<a[i]<<b[i];
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    6 |         gets(a);
      |         ^~~~
      |         getw
a.cc:8:24: error: 'strlen' was not declared in this scope
    8 |         for(int i=0;i<=strlen(a)-1;i++)
      |                        ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include<iostream>
  +++ |+#include <cstring>
    2 | using namespace std;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string O,E;
  cin >> O >> E;
 
  for(int i=0;i<O.size();i++)
  {
    cout << O.at(i);
    if(i<E.at(i))
    {
      cout << E.at(i):
    }
  }
    
}
    


Compiler output:
a.cc: In function 'int main()':
a.cc:13:22: error: expected ';' before ':' token
   13 |       cout << E.at(i):
      |                      ^
      |                      ;
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string O,E;
  cin >> O >> E;
  
  if(O.size()==E.size())
  {
    for(int i=0;i<O.size();i++)
    {
      cout << O.at(i) << E.at(i);
    }
  }
  
  else
  {
    for(int i=0;i<E.size();i++)
    {
      cout << O.at(i) << E.at(i);
    }
    cout << O.at(O.size());
  }
}
    
      
  

  
}

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