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

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:18:20: error: 'i' was not declared in this scope
   18 |       cout << O.at(i+1);
      |                    ^
Language: C++

using namespace std;

int main(){
    strings O,S;
    cin >> O >> S;
    for(int i=0;i<O.size();++i){
        cout<<O.at(i)+S.at(i);
    }
    cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:5: error: 'strings' was not declared in this scope
    4 |     strings O,S;
      |     ^~~~~~~
a.cc:5:5: error: 'cin' was not declared in this scope
    5 |     cin >> O >> S;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:5:12: error: 'O' was not declared in this scope
    5 |     cin >> O >> S;
      |            ^
a.cc:5:17: error: 'S' was not declared in this scope
    5 |     cin >> O >> S;
      |                 ^
a.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout<<O.at(i)+S.at(i);
      |         ^~~~
a.cc:7:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:9:5: error: 'cout' was not declared in this scope
    9 |     cout<<endl;
      |     ^~~~
a.cc:9:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:9:11: error: 'endl' was not declared in this scope
    9 |     cout<<endl;
      |           ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

using namespace std;

int main(){
    string O,S;
    cin >> O >> S;
    for(int i=0;i<O.size();++i){
        cout<<O.at(i)+S.at(i);
    }
    cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:5: error: 'string' was not declared in this scope
    4 |     string O,S;
      |     ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | using namespace std;
a.cc:5:5: error: 'cin' was not declared in this scope
    5 |     cin >> O >> S;
      |     ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:5:12: error: 'O' was not declared in this scope
    5 |     cin >> O >> S;
      |            ^
a.cc:5:17: error: 'S' was not declared in this scope
    5 |     cin >> O >> S;
      |                 ^
a.cc:7:9: error: 'cout' was not declared in this scope
    7 |         cout<<O.at(i)+S.at(i);
      |         ^~~~
a.cc:7:9: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:9:5: error: 'cout' was not declared in this scope
    9 |     cout<<endl;
      |     ^~~~
a.cc:9:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:9:11: error: 'endl' was not declared in this scope
    9 |     cout<<endl;
      |           ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
Language: C++

#include <bits/stdc++.h>
using namespace std;
const long long mod = pow(10, 9) + 7;
const long long MOD = 998244353;
const long long INF = 1LL << 60;
const int inf = pow(10, 9) + 7;
template <class T> bool chmin(T& a, T b) {if (a > b) {a = b; return true;} return false;}
template <class T> bool chmax(T& a, T b) {if (a < b) {a = b; return true;} return false;}
int divCeil(int A, int B) {return (A + (B - 1)) / B;}
long long divCeil(long long A, int B) {return (A + (B - 1)) / B;}
long long divCeil(int A, long long B) {return (A + (B - 1)) / B;}
long long divCeil(long long A, long long B) {return (A + (B - 1)) / B;}

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

Compiler output:
a.cc: In function 'int main()':
a.cc:19:23: error: 'N' was not declared in this scope
   19 |   for (int i = 0; i < N; i++)
      |                       ^
Language: C++

#include <iostream>
#include <cstdio>
#include <cstring>
#include <string>
using namespace std;
string a,b;
int main()
{
	cin >> a >> b;
	int al = a.length();
	int bl = b.length();
	for (int i = 0;i < bl;i++)
	{
		cout << a[i] << b[i];
	} 
	if (a > b) cout << a[l] << endl;
	cout << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:30: error: 'l' was not declared in this scope; did you mean 'bl'?
   16 |         if (a > b) cout << a[l] << endl;
      |                              ^
      |                              bl
Language: C++

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

int main() {
	string s1, s2;
	cin >> s1 >> s2;
	
	int size = s1.size();
	
	string rslt;
	for(int i=1;i<=size;i++){
		if(i%2==1) rslt += s1.subset(i-1,1);
		else if(i%2==0) rslt += s2.subset(i-1,1);
	}
	
	cout << rslt;
	cout << endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:39: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   13 |                 if(i%2==1) rslt += s1.subset(i-1,1);
      |                                       ^~~~~~
      |                                       substr
a.cc:14:44: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   14 |                 else if(i%2==0) rslt += s2.subset(i-1,1);
      |                                            ^~~~~~
      |                                            substr
Language: C++

#include <iostream>
using namespace std;

int main() {
	string s1, s2;
	cin >> s1 >> s2;
	
	int size = s1.size();
	
	string rslt;
	for(int i=1;i<=size;i++){
		if(i%2==1) rslt += s1.subset(i-1,1);
		else if(i%==0) rslt += s2.subset(i-1,1);
	}
	
	cout << rslt;
	cout << endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:39: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   12 |                 if(i%2==1) rslt += s1.subset(i-1,1);
      |                                       ^~~~~~
      |                                       substr
a.cc:13:28: error: expected primary-expression before '=' token
   13 |                 else if(i%==0) rslt += s2.subset(i-1,1);
      |                            ^
a.cc:13:43: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   13 |                 else if(i%==0) rslt += s2.subset(i-1,1);
      |                                           ^~~~~~
      |                                           substr
Language: C++

#include <iostream>
using namespace std;

int main() {
	string s1, s2;
	cin >> s1 >> s2;
	
	int size = s1.size();
	
	string rslt;
	for(i=1;i<=size;i++){
		if(i%2==1) rslt += s1.subset(i-1,1);
		else if(i%==0) rslt += s2.subset(i-1,1);
	}
	
	cout << rslt;
	cout << endl;
	
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:13: error: 'i' was not declared in this scope
   11 |         for(i=1;i<=size;i++){
      |             ^
a.cc:12:39: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   12 |                 if(i%2==1) rslt += s1.subset(i-1,1);
      |                                       ^~~~~~
      |                                       substr
a.cc:13:28: error: expected primary-expression before '=' token
   13 |                 else if(i%==0) rslt += s2.subset(i-1,1);
      |                            ^
a.cc:13:43: error: 'std::string' {aka 'class std::__cxx11::basic_string<char>'} has no member named 'subset'; did you mean 'substr'?
   13 |                 else if(i%==0) rslt += s2.subset(i-1,1);
      |                                           ^~~~~~
      |                                           substr
Language: C++

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

int main() {
  string o, e, ans;
  cin >> o >> e;
  
  ans.size() = o.size() + e.size();
  
  int i;
  for(i = 0; i < o.size(); i++){
    ans.at(2 * i) = o.at(i);
  }
  for(i = 0; i < e.size(); i++){
    ans.at(2 * i + 1) = e.at(i);
  }
  
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: lvalue required as left operand of assignment
    8 |   ans.size() = o.size() + e.size();
      |   ~~~~~~~~^~
Language: C++

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

int main() {
  string o, e, ans;
  cin >> o >> e;
  
  ans.size() = o.size() + e.size()
  
  int i;
  for(i = 0; i < o.size(); i++){
    ans.at(2 * i) = o.at(i);
  }
  for(i = 0; i < e.size(); i++){
    ans.at(2 * i + 1) = e.at(i);
  }
  
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:11: error: lvalue required as left operand of assignment
    8 |   ans.size() = o.size() + e.size()
      |   ~~~~~~~~^~
a.cc:11:7: error: 'i' was not declared in this scope
   11 |   for(i = 0; i < o.size(); i++){
      |       ^
a.cc:14:7: error: 'i' was not declared in this scope
   14 |   for(i = 0; i < e.size(); i++){
      |       ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:14: error: lvalue required as left operand of assignment
    8 |         if (i%2=0){
      |             ~^~
a.cc:15:6: error: expected '}' at end of input
   15 |     }
      |      ^
a.cc:4:19: note: to match this '{'
    4 |         int main(){
      |                   ^
Language: C++

#include<cstdio>
#include<cstring>
#include<algorithm>

using namespace std;

int main(){
	int i;
	char odd[55],even[55];
	gets(odd);
	gets(even);
	for(i=0;odd[i]!='\0'&&even[i]!='\0';i++){
		printf("%c",odd[i]);
		printf("%c",even[i]);
	}
	if(odd[i]!='\0'){
		printf("%c",odd[i]);
	}
	if(even[i]!='\0'){
		printf("%c",even[i]);
	}
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:10:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   10 |         gets(odd);
      |         ^~~~
      |         getw
Language: C++

#include<cstdio>

int main(){
	int i;
	char odd[55],even[55];
	gets(odd);
	gets(even);
	for(i=0;odd[i]!='\0'&&even[i]!='\0';i++){
		printf("%c",odd[i]);
		printf("%c",even[i]);
	}
	if(odd[i]!='\0'){
		printf("%c",odd[i]);
	}
	if(even[i]!='\0'){
		printf("%c",even[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(odd);
      |         ^~~~
      |         getw
Language: C++

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

int main() {
  string o,e;
  cin >> o >> e;
  for(int i=0; i<o.length()+e.length(); i++) {
    if(i%2==0) {
      cout << o[i/2];
    }
    else {
      cout << e[i/2];
    }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:2: error: expected '}' at end of input
   14 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

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

int main () {
  string o,e;
  cin >> o >> e;
  stirng ans;
  
  for(int i=0;i<o.size();i++){
    ans.push_back(o[i]);
    ans.push_back(e[i]);
  }
  cout << ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'stirng' was not declared in this scope
    7 |   stirng ans;
      |   ^~~~~~
a.cc:10:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   10 |     ans.push_back(o[i]);
      |     ^~~
      |     abs
a.cc:13:11: error: 'ans' was not declared in this scope; did you mean 'abs'?
   13 |   cout << ans;
      |           ^~~
      |           abs
Language: C

#include<stdio.h>

int main(){
    int lenO, lenE;
    char o[50], e[50], pas[100];
    scanf("%s", o);
    scanf("%s", e);

    for(lenO=0; o[lenO]!='\0'; lenO++);
    for(lenE=0; o[lenE]!='\0'; lenE++);

    for(int i=0; i<lenO+lenE; i++){
        if(i%2 == 0){
            if(o[i/2] !='\0') pas[i] = o[i/2];
            else pas[i] = e[i/2];
        }
        else pas[i] = e[i/2];
    }
    pas[lenO+lenE] = '\0'

    printf("%s",pas);
    return 0;
}

Compiler output:
main.c: In function 'main':
main.c:19:26: error: expected ';' before 'printf'
   19 |     pas[lenO+lenE] = '\0'
      |                          ^
      |                          ;
   20 | 
   21 |     printf("%s",pas);
      |     ~~~~~~
Language: C

#include<stdio.h>

int main(){
    int lenO, lenE;
    char o[50], e[50], pas[100];
    scanf("%s", o);
    scanf("%s", e);

    for(int i=0; i<100; i++){
        if(i%2 == 0 && o[i/2] !='\0') pas[i] = o[i/2];
        else if(&& e[i/2] !='\0') pas[i] = e[i/2];
    }
    printf("%s",pas);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:11:21: error: expected ')' before '[' token
   11 |         else if(&& e[i/2] !='\0') pas[i] = e[i/2];
      |                ~    ^
      |                     )
main.c:11:9: error: label 'e' used but not defined
   11 |         else if(&& e[i/2] !='\0') pas[i] = e[i/2];
      |         ^~~~
Language: C

#include<stdio.h>

int main(){
    int lenO, lenE
    char o[50], e[50], pas[100];
    scanf("%s", o);
    scanf("%s", e);

    for(int i=0; i<100; i++){
        if(i%2 == 1) pas[i] = o[i/2];
        else pas[i] = e[i/2];
    }
    printf("%s",pas);
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:5:5: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'char'
    5 |     char o[50], e[50], pas[100];
      |     ^~~~
main.c:6:17: error: 'o' undeclared (first use in this function)
    6 |     scanf("%s", o);
      |                 ^
main.c:6:17: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:17: error: 'e' undeclared (first use in this function)
    7 |     scanf("%s", e);
      |                 ^
main.c:10:22: error: 'pas' undeclared (first use in this function)
   10 |         if(i%2 == 1) pas[i] = o[i/2];
      |                      ^~~
Language: C++

#include<iostream>
using namespace std;
int main(){
    char a[100001];
    char b[100001];
    char c[100001];
    cin>>a>>b;
    int j=1,k=0,l=1;
    for(int i = 0;i<a.length();i++){
        c[k]=a[i];
        c[l]=b[i];
        k+=2;l+=2;
    }
    for(int i = 0;i<a.length();i++){
        cout<<c[i];
    }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:23: error: request for member 'length' in 'a', which is of non-class type 'char [100001]'
    9 |     for(int i = 0;i<a.length();i++){
      |                       ^~~~~~
a.cc:14:23: error: request for member 'length' in 'a', which is of non-class type 'char [100001]'
   14 |     for(int i = 0;i<a.length();i++){
      |                       ^~~~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
signed main(){
    string o,e; cin>>o>>e;
    string ans="";
    rep(i,o.size()+e.size()){
        ans+=(i%2?e.at(i/2):o.at(i/2));
    }
    cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:9: error: 'i' was not declared in this scope
    6 |     rep(i,o.size()+e.size()){
      |         ^
a.cc:6:5: error: 'rep' was not declared in this scope
    6 |     rep(i,o.size()+e.size()){
      |     ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
	string s,t;
	cin>>s>>t;
	f(i,t.size()){
		cout<<s[i]<<t[i];
	}
	if(t.size()<s.size()) cout<<s[s.size()-1];
	puts("");
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: 'i' was not declared in this scope
    6 |         f(i,t.size()){
      |           ^
a.cc:6:9: error: 'f' was not declared in this scope
    6 |         f(i,t.size()){
      |         ^
Language: C++

#include<iostream>
using namespace std;

int main(){
  string S,T;
  cin>>S>>T;
  for(auto &x:S,auto &t:T){
    cout<<x<<t;
  }
  cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: expected primary-expression before 'auto'
    7 |   for(auto &x:S,auto &t:T){
      |                 ^~~~
a.cc:7:17: error: expected ')' before 'auto'
    7 |   for(auto &x:S,auto &t:T){
      |      ~          ^~~~
      |                 )
a.cc:7:24: error: found ':' in nested-name-specifier, expected '::'
    7 |   for(auto &x:S,auto &t:T){
      |                        ^
      |                        ::
a.cc:7:23: error: 't' has not been declared
    7 |   for(auto &x:S,auto &t:T){
      |                       ^
a.cc:7:26: error: qualified-id in declaration before ')' token
    7 |   for(auto &x:S,auto &t:T){
      |                          ^
Language: C++

#include<iostream>
using namespace std;

int main(){
  string S,T;
  cin>>S>>T;
  for(auto &x:S,auto &t:yT){
    cout<<x<<t;
  }
  cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: expected primary-expression before 'auto'
    7 |   for(auto &x:S,auto &t:yT){
      |                 ^~~~
a.cc:7:17: error: expected ')' before 'auto'
    7 |   for(auto &x:S,auto &t:yT){
      |      ~          ^~~~
      |                 )
a.cc:7:24: error: found ':' in nested-name-specifier, expected '::'
    7 |   for(auto &x:S,auto &t:yT){
      |                        ^
      |                        ::
a.cc:7:23: error: 't' has not been declared
    7 |   for(auto &x:S,auto &t:yT){
      |                       ^
a.cc:7:27: error: qualified-id in declaration before ')' token
    7 |   for(auto &x:S,auto &t:yT){
      |                           ^
Language: C++

#include <iostream>
#include <array>
#include <vector>
#include <iomanip>
#include <string>
#include <cmath>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
using namespace std;

typedef  pair<int,int> P;
typedef long long LL;

const LL INF=300000000;
const LL MOD=1000000007;



int main(){
    string o,e;
    cin>>o>>e;
    string ans;
    for(int i=0;i<o.size;++i){
        if(i%2==0){
            ans.push_back(o[i]);
        }
        else ans.push_back(e[i]);
    }
    cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:25:21: 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 '()' ?)
   25 |     for(int i=0;i<o.size;++i){
      |                   ~~^~~~
      |                         ()
Language: C++

#include <iostream>

std::string O, E;

int main() {
  std::cin >> O >> E;
  for (int i=0; i<E.size(); ++i) {
    std::cout << O[i] << E[i];
  }
  std::cout << ( (O.size() - E.size() == 1) ? O.back() : "" ) << '\n';
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:45: error: operands to '?:' have different types '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'} and 'const char*'
   10 |   std::cout << ( (O.size() - E.size() == 1) ? O.back() : "" ) << '\n';
      |                  ~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~
Language: C

#include<stdio.h>

int main(){
  char O[51], E[51], p[101];
  int len = 0;
  
  while(E[len]){
    len++;
  }
  
  for (i = 0; i < len; i++){
    p[2*i] = O[i];
    p[2*i + 1] = E[i];
  }
  p[2*i] = '\0';
  
  printf("%s\n", p);
  
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:8: error: 'i' undeclared (first use in this function)
   11 |   for (i = 0; i < len; i++){
      |        ^
main.c:11:8: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

#include<iostream>
#include<vector>
#include<algorithm>
#include<complex>
using namespace std;
int main(){
	char a[51], b[51];
	cin >> a >> b;
	for (int i = 0; i < strlen(a); i++){
		cout << a[i];
		if (b[i] != '\0'){
			cout << b[i];
		}
	}
	cout << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:29: error: 'strlen' was not declared in this scope
    9 |         for (int i = 0; i < strlen(a); i++){
      |                             ^~~~~~
a.cc:5:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    4 | #include<complex>
  +++ |+#include <cstring>
    5 | using namespace std;
Language: C++

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

template<typename integer>
integer __lcm(integer a, integer b) {
    return (a * b) / __gcd(a, b);
}

int main() {
    string odd, evn;
    cin >> odd >> evn;

    size_t t = max(odd.size(), evn.size());
    rep (i, t) {
        if (i < odd.size()) {
            cout << odd[i];
        }
        if (i < evn.size()) {
            cout << evn[i];
        }
    cout << endl;

    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:11:12: note: to match this '{'
   11 | int main() {
      |            ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
	char a[110],b[110],t1=0,t2=0;
	scanf("%s%s",a,b);
	int len=max(strlen(a),strlen(b));
	for(int i=0;i<len*2;i++)
	{
		if(i%2==0)
			if(a[t]!=' ')
			cout<<a[t1++];
		else if(a[t]!=' ')
		cout<<b[t2++]; 
	} 
	cout<<endl;
	return 0;
}	


Compiler output:
a.cc: In function 'int main()':
a.cc:11:30: error: 't' was not declared in this scope
   11 |                         if(a[t]!=' ')
      |                              ^
Language: C

#include<stdio.h>
int N, M;
char O[51];
int main(){
  c=getchar();
  while(c!=10){
    O[N]=c;
    c=getchar(); N++;
  }
  c=getchar();
  while(c!=10){
    putchar(O[M]);
    putchar(c);
    c=getchar(); M++;
  }
  if(N!=M){
    putchar(O[N-1]);
  }
  putchar(10);
}


Compiler output:
main.c: In function 'main':
main.c:5:3: error: 'c' undeclared (first use in this function)
    5 |   c=getchar();
      |   ^
main.c:5:3: 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 sa,sb ,sc ;
	getline (cin ,sa );
	getline (cin,sb);
	int i ,j = 0,k = 0 .len ;
	len = sa .size()+ sb .size();
	for (i = 0 ; i < len ; i ++){
		if (i %2 == 1)sc + = sb [ j ++];
		else sc + = sa [ k ++];
	}
	cout << sc ;
	return 0 ; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:29: error: request for member 'len' in '0', which is of non-class type 'int'
    7 |         int i ,j = 0,k = 0 .len ;
      |                             ^~~
a.cc:8:9: error: 'len' was not declared in this scope
    8 |         len = sa .size()+ sb .size();
      |         ^~~
a.cc:10:36: error: expected primary-expression before '=' token
   10 |                 if (i %2 == 1)sc + = sb [ j ++];
      |                                    ^
a.cc:11:27: error: expected primary-expression before '=' token
   11 |                 else sc + = sa [ k ++];
      |                           ^
Language: C++

#include < bits / stdc ++.h >
using namespace std ; 
int main (){
	string sa,sb ,sc ;
	getline (cin ,sa );
	getline (cin,sb);
	int i ,j = 0,k = 0 .len ;
	len = sa .size()+ sb .size();
	for (i = 0 ; i < len ; i ++){
		if (i %2 == 1)sc + = sb [ j ++];
		else sc + = sa [ k ++];
	}
	cout << sc ;
	return 0 ; 
}

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 sa,sb ,sc ;
	getline (cin ,sa );
	getline (cin,sb);
	int i ,j = 0,k = 0 .len ;
	len = sa .size()+ sb .size();
	for (i = 0 ; i < len ; i ++){
		if (i %2 == 1)sc + = sb [ j ++];
		else sc + = sa [ k ++];
	}
	cout << sc ;
	return 0 ; 
}

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 >
使用命名空间std ; 
int main （）{
	string sa ，sb ，sc ;
	getline （cin ，sa ）;
	getline （cin ，sb ）;
	int i ，j = 0 ，k = 0 ，len ;
	len = sa 。size （）+ sb 。size （）;
	for （i = 0 ; i < len ; i ++）{
		if （i ％2 == 1 ）sc + = sb [ j ++];
		else sc + = sa [ k ++];
	}
	cout << sc ;
	返回0 ; 
}

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++

using namespace std;

#if __has_include("print.hpp")
  #include "print.hpp"
#endif

#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()

typedef long long ll;
typedef pair<int, int> p;

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

  if(o.size() > e.size()) {
   cout << o[int(o.size()-1)] << endl;
  }else{
    cout << endl;
  }



}


Compiler output:
a.cc:11:9: error: 'pair' does not name a type
   11 | typedef pair<int, int> p;
      |         ^~~~
a.cc: In function 'int main()':
a.cc:14:3: error: 'string' was not declared in this scope
   14 |   string o, e;
      |   ^~~~~~
a.cc:1:1: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
  +++ |+#include <string>
    1 | using namespace std;
a.cc:15:3: error: 'cin' was not declared in this scope
   15 |   cin >> o >> e;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:15:10: error: 'o' was not declared in this scope
   15 |   cin >> o >> e;
      |          ^
a.cc:15:15: error: 'e' was not declared in this scope
   15 |   cin >> o >> e;
      |               ^
a.cc:17:5: error: 'cout' was not declared in this scope
   17 |     cout << o[i] << e[i];
      |     ^~~~
a.cc:17:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:21:4: error: 'cout' was not declared in this scope
   21 |    cout << o[int(o.size()-1)] << endl;
      |    ^~~~
a.cc:21:4: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:21:34: error: 'endl' was not declared in this scope
   21 |    cout << o[int(o.size()-1)] << endl;
      |                                  ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | using namespace std;
a.cc:23:5: error: 'cout' was not declared in this scope
   23 |     cout << endl;
      |     ^~~~
a.cc:23:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:23:13: error: 'endl' was not declared in this scope
   23 |     cout << endl;
      |             ^~~~
a.cc:23:13: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
Language: C++

#include <iostream>
#include <vector>
#include <map>
#include <algorithm>
#include <utility>
using Int = long long;
using namespace std;
#define REP(i,n) for(int i=0;i<n;i++)
int main()
{
    string O, E; cin >> O >> E;
    int m = min(O.size(), E.size());
    for (int i = 0; i < m; i++) {
        cout << O[i] << E[i];
    }
    if (m < O.size()) {
        cout << O[i];
    }
    cout << endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:19: error: 'i' was not declared in this scope
   17 |         cout << O[i];
      |                   ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:15:19: error: no matching function for call to 'size()'
   15 |     cout << E[size() - 1] << flush;
      |               ~~~~^~
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;

int main() {
  string O, E;
  cin >> O >> E;
  E = E +'';
  for (int i = 0; i < O.length(); i++) {
    cout << O[i] << E[i] << flush;
  }
  cout << endl;
}

Compiler output:
a.cc:7:10: error: empty character constant
    7 |   E = E +'';
      |          ^~
Language: C++

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

int main() {
  string O, E;
  cin >> O >> E;
  E +='';
  for (int i = 0; i < O.length(); i++) {
    cout << O[i] << E[i] << flush;
  }
  cout << endl;
}

Compiler output:
a.cc:7:7: error: empty character constant
    7 |   E +='';
      |       ^~
Language: C++

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

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

Compiler output:
a.cc:7:21: error: empty character constant
    7 |   E[E.size() - 1] =='';
      |                     ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
string a,b;
int main(){
    cin>>a>>b;
    int len=max(a.length(),b.length());
    for(int i=0;i<len;i++)
        if(a[i]!='\0')putchar(a[i]);
        if(b[i]!='\0')putchar(b[i]);
    }
    cout<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: 'i' was not declared in this scope
    9 |         if(b[i]!='\0')putchar(b[i]);
      |              ^
a.cc: At global scope:
a.cc:11:5: error: 'cout' does not name a type
   11 |     cout<<endl;
      |     ^~~~
a.cc:12:5: error: expected unqualified-id before 'return'
   12 |     return 0;
      |     ^~~~~~
a.cc:13:1: error: expected declaration before '}' token
   13 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  string o, e;
  cin >> o >> e;
  string s = "";
  for(int i = 0; i < max(e.size(), o.size(); i++){
    s += o[i] + e[i];
  }
  cout << s << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:44: error: expected ')' before ';' token
    7 |   for(int i = 0; i < max(e.size(), o.size(); i++){
      |                         ~                  ^
      |                                            )
Language: C++

#include<cstring>
using namespace std;
int main(){
   char ch1[50],ch2[50];
  while(cin>>ch1>>ch2){
 int m=strlen(ch1);
 int n=strlen(ch2);
 for(int i=0;i<m;i++)
 {cout<<ch1[i];
 cout<<ch2[i];}
 if(m>n)
 for(int j=n;j<m;j++)
 cout<<ch1[j];
 else
    for(int k=m;k<n;k++)
    cout<<ch2[k];
 cout<<endl;
}
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:9: error: 'cin' was not declared in this scope
    5 |   while(cin>>ch1>>ch2){
      |         ^~~
a.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
    1 | #include<cstring>
  +++ |+#include <iostream>
    2 | using namespace std;
a.cc:9:3: error: 'cout' was not declared in this scope
    9 |  {cout<<ch1[i];
      |   ^~~~
a.cc:9:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:13:2: error: 'cout' was not declared in this scope
   13 |  cout<<ch1[j];
      |  ^~~~
a.cc:13:2: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:16:5: error: 'cout' was not declared in this scope
   16 |     cout<<ch2[k];
      |     ^~~~
a.cc:16:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:17:2: error: 'cout' was not declared in this scope
   17 |  cout<<endl;
      |  ^~~~
a.cc:17:2: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:17:8: error: 'endl' was not declared in this scope
   17 |  cout<<endl;
      |        ^~~~
a.cc:2:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
    1 | #include<cstring>
  +++ |+#include <ostream>
    2 | using namespace std;
Language: C++

#include<bits/stdc++.h>
using namespace std;
string s1,s2;
int main(void)
{
    getline(cin,s1);
    getline(cin,s2);
    cout<<s1[0];
    for(int i=0;i<s1.size()+s2.size()-1;++i)
        i%2?cout<<s1[i/2+1]:s2[i/2+1];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: error: operands to '?:' have different types 'std::basic_ostream<char>' and '__gnu_cxx::__alloc_traits<std::allocator<char>, char>::value_type' {aka 'char'}
   10 |         i%2?cout<<s1[i/2+1]:s2[i/2+1];
Language: C

#include<stdio.h>

char odd[51], even[51];

int main(void) {

	int i;

	gets_s(odd, 51);
	gets_s(even, 51);

	for (i = 0; i <= 50; i++) {
		if (odd[i] == '\n') {
			printf("\n");
			break;
		}

		putchar(odd[i]);
		putchar(even[i]);
	}


	return 0;

}

Compiler output:
main.c: In function 'main':
main.c:9:9: error: implicit declaration of function 'gets_s' [-Wimplicit-function-declaration]
    9 |         gets_s(odd, 51);
      |         ^~~~~~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: 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 |         if(o.size>e.size() && i==o.size-1) cout<<o[i];
      |            ~~^~~~
      |                  ()
a.cc:10:36: 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 |         if(o.size>e.size() && i==o.size-1) cout<<o[i];
      |                                  ~~^~~~
      |                                        ()
Language: C++

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<array>

using namespace std;
int main(){
  string a,b;
  cin >> a >> b;
  for(int i = 0;i < b.size;i++){
      cout << a[i] << b[i];
  }
  if(a.size() != b.size())
    cout << a[i];
  cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: 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 '()' ?)
   11 |   for(int i = 0;i < b.size;i++){
      |                     ~~^~~~
      |                           ()
a.cc:15:15: error: 'i' was not declared in this scope
   15 |     cout << a[i];
      |               ^
Language: C++

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<array>

using namespace std;
int main(){
  string a,b;
  cin >> a >> b;
  for(int i = 0;i < b.size;i++){
      cout << a[i] << b[i]
  }
  if(a.size() != b.size())
    cout << a[i];
  cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:23: 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 '()' ?)
   11 |   for(int i = 0;i < b.size;i++){
      |                     ~~^~~~
      |                           ()
a.cc:12:27: error: expected ';' before '}' token
   12 |       cout << a[i] << b[i]
      |                           ^
      |                           ;
   13 |   }
      |   ~                        
a.cc:15:15: error: 'i' was not declared in this scope
   15 |     cout << a[i];
      |               ^
Language: C++

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<array>

using namespace std;
int main(){
  string a,b;
  cin >> a >> b;
  for(int i = 0;i < a.size();i++){
      cout << a[i]
    if(b.size() >= i)
      cout << b[i];
  }
  cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:19: error: expected ';' before 'if'
   12 |       cout << a[i]
      |                   ^
      |                   ;
   13 |     if(b.size() >= i)
      |     ~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
char a[52],b[52];
int main()
{
  cin>>a;
  cin>>b;
  int i,x=strlen(a),y=strlen(b),l=min(la,lb),k=max(la,lb);
  for(i=0;i<=l-1;i++)
     cout<<a[i]<<b[i];
  if(x>y)
    for(i=l;i<=k-1;i++)
      cout<<a[i];
  else 
	for(i=l;i<=k-1;i++)
      cout<<b[i];
  return 0;
}//dasddsdas

Compiler output:
a.cc: In function 'int main()':
a.cc:8:39: error: 'la' was not declared in this scope; did you mean 'l'?
    8 |   int i,x=strlen(a),y=strlen(b),l=min(la,lb),k=max(la,lb);
      |                                       ^~
      |                                       l
a.cc:8:42: error: 'lb' was not declared in this scope; did you mean 'l'?
    8 |   int i,x=strlen(a),y=strlen(b),l=min(la,lb),k=max(la,lb);
      |                                          ^~
      |                                          l
a.cc:12:16: error: 'k' was not declared in this scope
   12 |     for(i=l;i<=k-1;i++)
      |                ^
a.cc:15:20: error: 'k' was not declared in this scope
   15 |         for(i=l;i<=k-1;i++)
      |                    ^
Language: C++

#include <bits/stdc++.h>

using namespace std;
typedef long long ll;
#define int ll

#define REP(i,n) for(ll i=0;i<n;++i)
#define SORT(name) sort(name.begin(), name.end())
#define ZERO(p) memset(p, 0, sizeof(p))
#define MINUS(p) memset(p, -1, sizeof(p))
#if 1
#  define DBG(fmt, ...) printf(fmt, ##__VA_ARGS__)
#else
#  define DBG(fmt, ...)
#endif

const ll LLINF = (1LL<<60);
const int INF = (1LL<<30);
const double DINF = std::numeric_limits<double>::infinity();
const int MOD = 1000000007;
#define MAX_N 110


signed main()
{
    string O, E;
    cin >> O >> E;
    REP(i, O.length()) {
        if(i >= E.length()) {
            printf("%c", O[i])
        } else {
            printf("%c%c", O[i], E[i]);
        }
    }
    printf("\n");
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:31: error: expected ';' before '}' token
   30 |             printf("%c", O[i])
      |                               ^
      |                               ;
   31 |         } else {
      |         ~
Language: C++

#include<iostream>
#include<string>
#include<cstring>
using namespace std;
int main()
{
    string a,b;
    cin>>a>>b;
    int s1=a.size();
    int s2=b.size();
    if(s1==s2) for(int i=0;i<s1;i++)cout<<a[i]<<b[i];
    else
    {
        for(int i=0;i<s2;i++)cout<<<a[i]<<b[i];
        cout<<a[s1-1];
    }
    cout<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:36: error: expected primary-expression before '<' token
   14 |         for(int i=0;i<s2;i++)cout<<<a[i]<<b[i];
      |                                    ^
Language: C++

#include<iostream>
#include<algorithm>
#include<string>
#include<map>
#include<set>
#include<vector>
#include<string.h>
#include<math.h>
#include<stdio.h>
#include<queue>
#include<utility>
#include<cstdio>
#include<cstring>
#include<new>
#include<new.h>
#include<float.h>
#include<ctype.h>
#include<cfloat>
#include<cmath>
#include<cctype>
#include<errno.h>
#include<cerrno>
#include<memory>
#include<memory.h>
#include<assert.h>
#include<cassert>
#include<deque>
#include<sstream>
#define fo(i,w,n) for(int i=(int) w;i<(int) n;i++)
#define qui queue<int>
#define vit vector<int>
#define ll long long
#define pb push_back
#define lb lower_bound
#define ub upper_bound
#define prq priority_queue
#define pii pair<int,int>
#define mp make_pair
#define sz size()
#define em empty()
#define ct continue
#define ms multiset
#define all(a) (a).begin(),(a).end()
#define pf push_front
#define ppf pop_front()
using namespace std;
int main()
{
	string a,b;
	cin>>a>>b;
	fo(i,0,max(a.sz,b.sz)){
		if(i<a.sz)cout<<a[i];
		if(i<b.sz)cout<<b[i];
	}
	return 0;
}

Compiler output:
a.cc:15:9: fatal error: new.h: No such file or directory
   15 | #include<new.h>
      |         ^~~~~~~
compilation terminated.
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
	string a,b;
	int len1,len2,minn;
	cin>>a>>b;
	len1=a.length();
	len2=b.length();
	minn=min(len1,len2);
	maxx=max(len1,len2);
	for(int i=0;i<minn;i++)
	cout<<a[i]<<b[i];
	if(len1>len2)
        for(int i=minn;i<maxx;i++)
            cout<<a[i];
    else for(int i=minn;i<maxx;i++)
            cout<<b[i];
	cout<<endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:9: error: 'maxx' was not declared in this scope
   11 |         maxx=max(len1,len2);
      |         ^~~~
Language: C++

#include<queue>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
using namespace std;
char a[51],b[51];
int main()
{
	cin>>a>>b;
	for (int i=0;i<=strlen(a)-1;i++)
	{
		cout<<a[i]
		if (b[i]!=' ') cout<<b[i];
	}
//	system("pause");
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:27: error: expected ';' before 'if'
   13 |                 cout<<a[i]
      |                           ^
      |                           ;
   14 |                 if (b[i]!=' ') cout<<b[i];
      |                 ~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string O,E,a;
  int o,e;
  cin >> O >> E;
  o=O.size();
  e=E.size();
  if(o==e){
    for(int i=0;i<e;i++){
      a+=O.at(i)+E.at(i);
    }
  }
  else{
     for(int i=0;i<e;i++){
      a+=O.at(i)+E.at(i);
    }
    a+=O.at(o-1);
  }
  cout << a << endl;
}
}

Compiler output:
a.cc:23:1: error: expected declaration before '}' token
   23 | }
      | ^
Language: Java

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class ABC_058_B {
	public static void main(String[] args) throws IOException {
		BufferedReader oi = new BufferedReader(new InputStreamReader(System.in));
		String[] odd = oi.readLine().split("");
		String[] even = oi.readLine().split("");

		int od = odd.length;
		int ev = even.length;
		String a=odd[0];
		for(int i=1; i < od + ev; i++) {
			if(i%2==1) a = a + odd[i/2];
			else a = a + even[i/2];
		}
		System.out.println(a);
	}
}


Compiler output:
Main.java:5: error: class ABC_058_B is public, should be declared in a file named ABC_058_B.java
public class ABC_058_B {
       ^
1 error
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:15:59: error: expected ';' before '<' token
   15 |                         for(int s=min(a.size(),b.size()),s<a.size();s++)
      |                                                           ^
      |                                                           ;
a.cc:15:59: error: expected primary-expression before '<' token
a.cc:21:51: error: expected ';' before '<' token
   21 |                 for(int s=min(a.size(),b.size()),s<b.size();s++)
      |                                                   ^
      |                                                   ;
a.cc:21:51: error: expected primary-expression before '<' token
Language: C++

#include<iostream>
#include<cmath>
#include<cstring>
#include<algorithm>
#include<vector>
using namespace std;
int main()
{
	char a[50],b[50],x,y=0,o,p;
	gets(a);
	gets(b);
	o=strlen(a);
	p=strlen(b);
	if(o-p==1)
	{
		y++;
	}
	for(x=0;x<p;x++)
	{
		cout<<a[x];
		cout<<b[x];
	}
	if(y==1)
	{
		cout<<a[o];
	}
	cout<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   10 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

import java.util.Scanner;




public class Main {

    public static void main(String[] args) {

    	Main main=new Main();

    	main.run();

    }

    void run() {
    	Scanner sc=new Scanner(System.in);

    	String[] Odd=sc.next().split("");
    	String[] Even=sc.next().split("");

    	int length=Odd.length+Even.length;

    	int indexO=0;
    	int indexE=0;

    	StringBuilder result=new StringBuilder();

    	while(true) {

    			if(indexO<=Odd.length-1) {
    				result.append(Odd[indexO]);
    			}

    			if(indexE<=Even.length-1) {
    				result.append(Even[indexE]);
    			}


    			if(indexO>=Odd.length-1 && indexE>=Even.length-1) {
        			break;
        		}else {
        			indexO++;
        			indexE++;
        		}

    	}

    	System.out.println(result.toString());
    }

}



Compiler output:
a.cc:1:1: error: 'import' does not name a type
    1 | import java.util.Scanner;
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
a.cc:6:1: error: expected unqualified-id before 'public'
    6 | public class Main {
      | ^~~~~~
Language: C++

#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    string s, t;
    cin >> s >> t;
    for (int i = 0; i < t.length(); i++) {
        cout << s[i] << t[i];
    }
    if (s.length() - t.length) cout << s[s.length() - 1] << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:24: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::length() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
   10 |     if (s.length() - t.length) cout << s[s.length() - 1] << endl;
      |                      ~~^~~~~~
      |                              ()