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

#include <bits/stdc++.h>
int main()
{
  int A, B;
  cin >> A >> B;
  cout << (A*B==15?"*":"+") << endl;
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> A >> B;
      |   ^~~
      |   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:6:3: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    6 |   cout << (A*B==15?"*":"+") << 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:6:32: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    6 |   cout << (A*B==15?"*":"+") << 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: Java

import java.util.Scanner;
public class A918 {
	public static void main(String[] args) {	 
		Scanner in = new Scanner(System.in);
		int a = in.nextInt(), b = in.nextInt();
		if (a + b == 15) System.out.println("+");
		else if (a * b == 15) System.out.println("*");
		else System.out.println("x");
	}
}	
	


Compiler output:
Main.java:2: error: class A918 is public, should be declared in a file named A918.java
public class A918 {
       ^
1 error
Language: C++

#include <vector>
#include <list>
#include <map>
#include <set>
#include <deque>
#include <stack>
#include <bitset>
#include <algorithm>
#include <functional>
#include <numeric>
#include <utility>
#include <sstream>
#include <iostream>
#include <iomanip>
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cctype>
#include <string>
#include <cstring>
#include <ctime>

using namespace std;
inline int toInt(string s) {int v; istringstream sin(s);sin>>v;return v;}
int main(){
  int a,b;
  cin >> a >> b;
  if(a*b == 15) cout << "*" << endl;
  else if(a + b == 15) cout << "+" << endl;
  else cout << "x" << endl;
}

  return 0;
}


Compiler output:
a.cc:33:3: error: expected unqualified-id before 'return'
   33 |   return 0;
      |   ^~~~~~
a.cc:34:1: error: expected declaration before '}' token
   34 | }
      | ^
Language: C++

/**
 *    Author:  "Robin Singh" !!!!    
**/
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define eb emplace_back
#define all(x) (x).begin(),(x).end()
#define ff first
#define ss second
#define mp make_pair
#define str string 
#define szz(v) ((int)(v).size())  
#define fr(i, j, k) for(int i = j; i < k; i++)     // 0 -> n-1 (i,0,n)
#define bk(i, j, k) for(int i = j-1; i >= k; i--)  // n-1 -> 0 (i,n,0)
#define frit(it, a) for(__typeof((a).begin()) it = a.begin(); it != a.end(); ++it)
#define mem(ptr)  memset(ptr, 0, sizeof ptr)  // use fill() for value other than 0 //
#define rtn return 
#define itt(a)   __typeof((a).begin())
#define RT  (cerr << "\nTime elapsed: " << 1000 * clock() / CLOCKS_PER_SEC << " ms\n")  // Run Time
#define nl "\n"  // New Line
#define dbg(x) (cerr << #x << " = " << x << "  ")
#define enl (cerr << "\n")
#define dbgg(x,y) (cerr << #x << " = " << x << " -> " << #y << " = " << y << "\n")
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<long long> vll;
typedef vector< pair<int,int> > vpii;
typedef vector< pair<ll, ll> > vpll;
const long long mod = 1e9+7;
const ld eps = 1e-9;
const int inf = (1<<30);
const ll INF = (1LL<<61);

ll gcd(ll a,ll b) { return b==0 ? a : gcd(b, a%b); }
ll expo(ll x, ll y){ ll res = 1; x = x % mod;  while (y > 0) { if (y & 1)res = (res*x) % mod; y = y>>1;x = (x*x) % mod;}return res;}
void matmul(ll a[][2], ll b[][2]) { ll tmp[2][2]; for(int i=0; i<2; i++) { for(int j=0; j<2; j++) { tmp[i][j] = 0; for(int k=0; k<2; k++) tmp[i][j] = (tmp[i][j] + a[i][k]*b[k][j]) % mod; }} for(int i=0; i<2; i++) for(int j=0; j<2; j++) a[i][j] = tmp[i][j]; }
ll fibo(int n)    // returns nth fibonacci number, also S(n) = f(n+2)-1
{ if(n == 0) return 0; else if(n == 1) return 1; ll T[2][2] = { {0, 1} , {1, 1} }; ll res[2][2] = { {1, 0}, {0,1} }; n--; while(n) { if(n & 1) matmul(res, T); n >>= 1; matmul(T, T); } return res[1][1]; }

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(0);
    int a, b;
    cin >> a >> b;
    if(a+b = 15) cout << "+";
    else if(a*b == 15) cout << "*";
    else cout << "x";
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:49:9: error: lvalue required as left operand of assignment
   49 |     if(a+b = 15) cout << "+";
      |        ~^~
Language: C++

/* include {{{ */
#include <cctype>
#include <climits>
#include <cmath>
#include <cstdio>
#include <cstdlib>
#include <cstring>
#include <cinttypes>
#include <cfloat>

#include <iostream>
#include <algorithm>
#include <string>
#include <list>
#include <numeric>
#include <bitset>
#include <complex>
#include <deque>
#include <functional>
#include <iomanip>
#include <queue>
#include <utility>
#include <vector>
#include <tuple>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
/* }}} */
/* macro {{{ */
// clang-format off
#define GET_MACRO(_1, _2, _3, _4, NAME, ...) NAME
#define rep(...) GET_MACRO(__VA_ARGS__, rep4, rep3, rep2, rep1)(__VA_ARGS__)
#define rep1(n) rep2(_, n)
#define rep2(i, n) rep3(i, 0, n)
#define rep3(i, a, n) rep4(i, a, n, 1)
#define rep4(i, a, n, s) for (i64 i = (a); i < (i64)(n); i += (s))
#define rrep(...) GET_MACRO(__VA_ARGS__, rrep4, rrep3, rrep2, rrep1)(__VA_ARGS__)
#define rrep1(a) rrep2(_, a)
#define rrep2(i, a) rrep3(i, a, 0)
#define rrep3(i, a, n) rrep4(i, a, n, 1)
#define rrep4(i, a, n, s) for (i64 i = (a); i >= (i64)(n); i -= (s))
#define each(i, ctn) for (auto &&i : (ctn))

#define all(v) begin(v), end(v)
#define debug(x) cerr << (x) << " (L:" << __LINE__ << ")" << '\n'
/* }}} */
/* using {{{ */
using i32 = std::int_fast32_t;
using i64 = std::int_fast64_t;
using ui32 = std::uint_fast32_t;
using ui64 = std::uint_fast64_t;
using f32 = std::float_t;
using f64 = std::double_t;
template <class T> using vec = std::vector<T>;
template <class T> using heap = std::priority_queue<T>;
template <class T> using minheap = std::priority_queue<T, vec<T>, std::greater<T>>;
using vi = vec<i32>;
using vvi = vec<vi>;
using vvvi = vec<vvi>;
using pii = std::pair<i32, i32>;
/* }}} */
/* constexpr {{{ */
i32 constexpr INF = 1001001001;
i64 constexpr LINF = 1001001001001001001ll;
i32 constexpr MOD = (i32)1e9 + 7;
f64 constexpr EPS = 1e-9;
f64 constexpr PI = M_PI;
i32 constexpr dx[] = {0, 1, 0, -1, 1, -1, 1, -1}, dy[] = {1, 0, -1, 0, 1, -1, -1, 1};
/* }}} */
/* function {{{ */
inline bool inside(i32 y, i32 x, i32 h, i32 w) { return y >= 0 && x >= 0 && y < h && x < w; }
template <class T> inline void pr(T const& x) { std::cout << x << '\n'; }
template <class T> inline void pr(vec<T> const& v, std::string d = "\n") { rep(i, v.size()) std::cout << v[i] << (i == (i64)(v.size() - 1) ? "\n" : d); }
template <class T, class... Args> inline void pr(T const& x, Args const&... trail) {
  std::cout << x << " ";
  print(trail...);
}
struct IO_PRE_ { IO_PRE_() { std::cin.tie(nullptr); std::ios::sync_with_stdio(false); std::cout << std::fixed << std::setprecision(12); } } pre__;
// clang-format on
/* }}} */

i32 main() {
  i32 a, b;
  std::cin >> a >> b;
  if (a + b == 15) {
    pr("+");
  } else if (a * b == 15) {
    pr("*");
  } else {
    pr("x");
  }
}


Compiler output:
a.cc:83:1: error: '::main' must return 'int'
   83 | i32 main() {
      | ^~~
Language: C++

a, b = gets.split.map(&:to_i)
if a+b == 15
	puts "+"
elsif a*b == 15
	puts "*"
else
	puts "x"
end
		

Compiler output:
a.cc:1:1: error: 'a' does not name a type
    1 | a, b = gets.split.map(&:to_i)
      | ^
Language: C++

a,b = map(int,input().split())

res=0
if b + a==15:
    res="+"
elif b*a == 15:
    res="*"
else:
    res="x"

print(res)

Compiler output:
a.cc:1:1: error: 'a' does not name a type
    1 | a,b = map(int,input().split())
      | ^
Language: C++

# input
a, b = map(int, input().split())

if a + b == 15:
    print('+')
elif a * b == 15:
    print('*')
else:
    print('x')

Compiler output:
a.cc:1:3: error: invalid preprocessing directive #input
    1 | # input
      |   ^~~~~
a.cc:2:1: error: 'a' does not name a type
    2 | a, b = map(int, input().split())
      | ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);

	int a,b; cin >> a >> b;

	if(a+b == 15) cout << "+" << endl;
	else if(a*B == 15) cout << "*" << endl;
	else cout << "x" << endl;	

	return 0;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:19: error: 'B' was not declared in this scope
   12 |         else if(a*B == 15) cout << "*" << endl;
      |                   ^
Language: C

#include <iostream>
#include <vector>
#include <numeric>
#include <algorithm>
using namespace std;
#define ll long long

int main(){
        int A,B;
        cin >> A >> B;
        if(A+B==15) {
                cout << '+' << endl;
        }else if(A*B==15) {
                cout << '*' << endl;

        }else{
                cout << 'x' << 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 <iotstream>

using namespace std;

int main() {
    int a, b; cin >> a >> b;
    if (a + b == 15) {
        cout << "+" << endl;
    } else if (a * b == 15) {
        cout << "*" << endl;
    } else {
        cout << "x" << endl;
    }
    return 0;
}

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

#include <bits/stdc++.h>

using namespace std;

#define rep(i, n) for(int i = 0; i < (int)n; ++i)
#define repf(i, f, l) for(int i = f; i < (int)l; ++i)
#define repit(it, t) for(__typeof((t).begin()) it = (t).begin(); it != (t).end(); it++)
#define endl "\n"
#define pb emplace_back
#define lb lower_bound
#define int long long
#define ul unsigned long
#define ull unsigned long long
#define ll long long
#define INF 1000000007
#define MOD 1000000007
#define fs first
#define sd second
#define DBG0(x) { cout << #x << ": " << x << "\t"; }
#define DBG(x) {DBG0(x); cout << endl;}
#define DBG2(x, y) {DBG0(x); DBG(y);}
#define DBG3(x, y, z) {DBG0(x); DBG2(y, z);}
#define DBG4(w, x, y, z) {DBG0(w); DBG3(x, y, z);}

typedef vector<int> vint;
typedef vector<ll> vll;
typedef vector<ul> vul;
typedef vector<ull> vull;
typedef vector<bool> vbl;
typedef pair<int, int> pii;

signed main(void){
    ios::sync_with_stdio(false);
    cin >> a >> b;
    if (a + b == 15) {
        cout << '+' << endl;
    } else if (a * b == 15) {
        cout << 'x' << endl;
    } else { 
        cout << 'x' << endl;
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:34:12: error: 'a' was not declared in this scope
   34 |     cin >> a >> b;
      |            ^
a.cc:34:17: error: 'b' was not declared in this scope; did you mean 'lb'?
   34 |     cin >> a >> b;
      |                 ^
      |                 lb
Language: C++

#include <bits/stdc++.h>
using namespace std;
int a,b;
void solve()
{
    if (a+b==15) cout<<"+"
    else if (a*b==15) cout<<"*";
    else cout<<"x";
    cout<<endl;
}
int main()
{
    while(cin>>a>>b)
        solve();
}

Compiler output:
a.cc: In function 'void solve()':
a.cc:6:27: error: expected ';' before 'else'
    6 |     if (a+b==15) cout<<"+"
      |                           ^
      |                           ;
    7 |     else if (a*b==15) cout<<"*";
      |     ~~~~
Language: C++

#include <random>
#include <vector>
#include <cstdio>
#include <iostream>
#include <tuple>
#include <stdexcept>
#include <map>
#include <set>
#include <algorithm>
#include <cassert>
#include <cmath>
#include <cstring>
#include <deque>
#include <numeric>
#include <unordered_map>
#include <bitset>
#include <queue>

#define pb push_back
#define F first
#define S second
using namespace std;
typedef long long ll;
#define mod ll(998244353)
#define mp make_pair
#define pb push_back
#define sqr(xx) ((xx)*(xx))

const int sz = 2e6;

int main() {
    cin >> a >> b;
    if (a + b == 15)
        cout << "+";
    else
    if (a * b == 15)
        cout << "*";
    else
        cout << "x";

}


Compiler output:
a.cc: In function 'int main()':
a.cc:32:12: error: 'a' was not declared in this scope
   32 |     cin >> a >> b;
      |            ^
a.cc:32:17: error: 'b' was not declared in this scope; did you mean 'pb'?
   32 |     cin >> a >> b;
      |                 ^
      |                 pb
Language: C++

{
    // See https://go.microsoft.com/fwlink/?LinkId=733558
    // for the documentation about the tasks.json format
    "version": "2.0.0",
    "tasks": [
        {
            "label": "build",
            "type": "shell",
            "command": "g++",
            "args": [
                "-g",
                "-DLOCAL",
                "-std=c++0x",
                "main.cpp"
            ],
            "group": "build",
            "problemMatcher": []
        }
    ]
}

Compiler output:
a.cc:1:1: error: expected unqualified-id before '{' token
    1 | {
      | ^
Language: C++

/*betaでやろう*/
#include <iostream>
#include <iomanip>
#include <algorithm>
#include <vector>
#include <stack>
#include <queue>
#include <cmath>
#include <set>
#include <map>
#include <string>
#include <numeric>
#include <cstdio>
#include <cstdlib>
#include <iterator>
#include <cstring>

using namespace std;

typedef pair<int, int> P;
typedef long long ll;
#define PB push_back
#define rep(i, a) for(int i = 0; i < a; i++)
#define all(v) v.begin(),v.end()
#define FF first
#define SS second
#define mp make_pair
#define INT int_64
const ll INF = (ll)(1<<30)*10000;
const ll NEGA=-INF*10000; 


ll ans = 0;
int cnt=0;

ll a[200000];
int used[1001];
ll dp[1001][1001];
ll sumx,sumy,sumz;
ll sx,sy,sz;
int main() 
{
 
 ll a,b;
 cin>>a>>b;
 if(a+b==15) ciut<<'+'<<endl;
 else if(a*b==15) cout<<'*'<<endl;
 else cout<<'x'<<endl;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:46:14: error: 'ciut' was not declared in this scope
   46 |  if(a+b==15) ciut<<'+'<<endl;
      |              ^~~~
Language: C++

a,b = map(int,input().split())

res=0
if b + a=15:
    res="+"
elif b*a = 15:
    res="*"
else:
    res="x"

print(res)

Compiler output:
a.cc:1:1: error: 'a' does not name a type
    1 | a,b = map(int,input().split())
      | ^
Language: Java

import java.util.*;
import java.io.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int b = sc.nextInt();
        if(a+b==15) System.out.println("+");
        else if(a*b==15) System.out.println("*");
        else System.out.prntln("x");
    }
}

Compiler output:
Main.java:11: error: cannot find symbol
        else System.out.prntln("x");
                       ^
  symbol:   method prntln(String)
  location: variable out of type PrintStream
1 error
Language: C++

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

int main() {
  string S;
  int w;
  cin >> S >> w;
  for (int i=0; i<S.length(); i+=w) {
    cout<<s[i];
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:11: error: 's' was not declared in this scope
    9 |     cout<<s[i];
      |           ^
Language: Java

import java.util.*;

public class Main {
	public static void main(String[] args) throws Exception{
		Scanner scn = new Scanner(System.in);
		String s = scn.next();
		int w = scn.nextInt();
      	String[] list = s.split("");
      	String ans = null;
      	for(int i=0; i<s.length(); +=w){
          ans = ans + list[i];
        }
      	System.out.println(ans);
	}
}

Compiler output:
Main.java:10: error: illegal start of expression
      	for(int i=0; i<s.length(); +=w){
      	                           ^
1 error
Language: C++

#include<iostream>

using namespace std;

int main(){
  string s;
  int w
  cin >> s >> w;
  string ans = "";
  for(int i = 0; i < s.size(); i += w){
    ans += s[i];
  }
  cout << ans << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected initializer before 'cin'
    8 |   cin >> s >> w;
      |   ^~~
a.cc:10:37: error: 'w' was not declared in this scope
   10 |   for(int i = 0; i < s.size(); i += w){
      |                                     ^
Language: C++

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

int main()
{
    string s;
    int w;
    cin >> s >> w;

    int len = s.size();
    for (int i = 0; i < len; i += w;)
    {
        cout << s[i];
    }
    cout << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:36: error: expected ')' before ';' token
   11 |     for (int i = 0; i < len; i += w;)
      |         ~                          ^
      |                                    )
a.cc:11:37: error: expected primary-expression before ')' token
   11 |     for (int i = 0; i < len; i += w;)
      |                                     ^
Language: C++

#define _GLIBCXX_DEBUG
#include <bits/stdc++.h>
using namespace std;
#define int long long
#define rep(i,n) for(int i=0;i<n;i++)
#define rep1(i,n) for(int i=1;i<=n;i++)
#define rep2(i,n) for(int i=0;i<=n;i++)
#define repr(i,a,n) for(int i=a;i<n;i++)
#define all(a) a.begin(),a.end()
#define P pair<long long,long long>
#define uni(e) e.erase(unique(e.begin(),e.end()),e.end())
#define double long double
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
int INF=1e10;
int MOD=1e9+7;
template<class T> void out(T a){cout<<a<<'\n';}
template<class T> void yesno(T b){if(b)out("yes");else out("no");}
template<class T> void YesNo(T b){if(b)out("Yes");else out("No");}
template<class T> void YESNO(T b){if(b)out("YES");else out("NO");}
template<class T> void noyes(T b){if(b)out("no");else out("yes");}
template<class T> void NoYes(T b){if(b)out("No");else out("Yes");}
template<class T> void NOYES(T b){if(b)out("NO");else out("YES");}
int keta(int a){
  double b=a;
  b=log10(b);
  int c=b;
  return c+1;
}
int gcd(int a,int b){
  if(a%b==0)
    return b;
  return gcd(b,a%b);
}
int lcm(int a,int b){
    return a/gcd(a,b)*b;
}
bool sosuu(int a){
  bool b=1;
  if(a<=1)
    return 0;
  else{
  rep1(i,sqrt(a)-1){
  if(a%(i+1)==0)
  b=0;
  }
  return b;
  }
}
int modpow(int a,int b,int m=MOD){
	if(!b)return 1;	if(b&1)return modpow(a,b-1,m)*a%m;
	int memo = modpow(a,b>>1,m);
	return memo*memo%m;
}
int fact_mod(int n) {
    int f=1; 
for(int i=2;i<n+1;i++) f=f*(i%MOD)% MOD;
    return f;
}
int mod_pow(int x,int n) {
    int res=1;
    while(n>0){
        if(n&1) res=(res*x)%MOD; 
        x=(x*x)%MOD;        
n>>=1; 
    }
    return res;
}
int c_mod(int n, int r) {
    if(r>n-r) r=n-r;
    if(r==0) return 1;
    int a=1;
    rep(i,r) 
a=a*((n-i)%MOD)%MOD;
    int b=mod_pow(fact_mod(r), MOD-2);
    return (a%MOD)*(b%MOD)%MOD;
}
signed main(){
  string a;
  int b;
  cin>>a>>b;
  for(int i=0;i<a.size();i+=b)
    cout<<a[i];
  cout<<''<<endl;
}

Compiler output:
a.cc:84:9: error: empty character constant
   84 |   cout<<''<<endl;
      |         ^~
Language: C++

#include<bits/stdc++.h>

int main(){
  string S;
  int w;
  cin >> S >> w;
  for(int i; i < S.size(); i++){
    if (i % w == 0) cout << S[i] << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string S;
      |   ^~~~~~
a.cc:4:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 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/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |   cin >> S >> w;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:10: error: 'S' was not declared in this scope
    6 |   cin >> S >> w;
      |          ^
a.cc:8:21: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |     if (i % w == 0) cout << S[i] << 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:8:37: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    8 |     if (i % w == 0) cout << S[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)
      |     ^~~~
Language: C++

#include<bits/stdc++>

int main(){
  string S;
  int w;
  cin >> S >> w;
  for(int i; i < S.size(); i++){
    if (i % w == 0) cout << S[i] << endl;
  }
}

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

/mnt/z/Projects/WorkspaceCP/cmake-build-debug-wsl/a
souuundhound
2
suudon

Process finished with exit code 0


Compiler output:
a.cc:1:1: error: expected unqualified-id before '/' token
    1 | /mnt/z/Projects/WorkspaceCP/cmake-build-debug-wsl/a
      | ^
Language: C++

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

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespce'
    2 | using namespce std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:4:5: error: 'string' was not declared in this scope
    4 |     string s;
      |     ^~~~~~
a.cc:4:5: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 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/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:6:5: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |     cin>>s>>n;
      |     ^~~
      |     std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:6:10: error: 's' was not declared in this scope
    6 |     cin>>s>>n;
      |          ^
a.cc:7:33: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |     for(int i=0;i<s.size();i+=n)cout<<s[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 s;
    cin >> s;
    int w;
    cin >> w;
    int a=0;
    while(1){
        cout << s[a];
        a+=w;
        if(a>=s.size()) break;
    }
    return;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:5: error: return-statement with no value, in function returning 'int' [-fpermissive]
   15 |     return;
      |     ^~~~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: 'N' was not declared in this scope
    7 |   for(int i = 0; i < N; i += w){
      |                      ^
Language: Java

import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    String s=sc.next();
    int w=s.nextInt();
    String ans="";
    for(int i=0;i<s.length();i+=w){
      ans+=s.substring(i,i+1);
    }
    System.out.println(ans);
  }
}

Compiler output:
Main.java:7: error: cannot find symbol
    int w=s.nextInt();
           ^
  symbol:   method nextInt()
  location: variable s of type String
1 error
Language: C

s = input()
w = int(input())

for i in range(0, len(s), w):
    print(s[i], end="")

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | s = input()
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 's' [-Wimplicit-int]
main.c:1:5: error: implicit declaration of function 'input' [-Wimplicit-function-declaration]
    1 | s = input()
      |     ^~~~~
main.c:1:5: error: initializer element is not constant
main.c:2:1: error: expected ',' or ';' before 'w'
    2 | w = int(input())
      | ^
Language: C++

#include<bits/stdc++.h>

using namespace std;
typedef long long ll;

int main(){
    string s; cin>>s;
	ll n; cin>>n;
    for(int i=0;i<sz(s);i+=n) cout<<s[i];
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:19: error: 'sz' was not declared in this scope; did you mean 's'?
    9 |     for(int i=0;i<sz(s);i+=n) cout<<s[i];
      |                   ^~
      |                   s
Language: C++

#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <math.h>
using namespace std;
typedef long long int ll;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:12:36: error: expected ')' before ';' token
   12 |         for(int i=0;i<s.size();i+=w;){
      |            ~                       ^
      |                                    )
a.cc:12:37: error: expected primary-expression before ')' token
   12 |         for(int i=0;i<s.size();i+=w;){
      |                                     ^
Language: C++


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


using namespace std;

int main()
{

//    freopen("in.txt", "r", stdin);
//	freopen("out.txt", "w", stdout);


    char str[1100];
    int i, j, w;
    while(gets(str))
    {
        char str2[1000];
        int len ;

        scanf("%d", &w);
        len = strlen(str);

        for( i=0, j=0; i<=len; i = i+w, j++ )
        {
            str2[j] = str[i];
        }

        for( i=0; i<j; i++ )
        {
            printf("%c", str2[i]);
        }
        printf("\n");
    }

    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:19:11: error: 'gets' was not declared in this scope; did you mean 'getw'?
   19 |     while(gets(str))
      |           ^~~~
      |           getw
Language: C++

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

using namespace std;

int main()
{


    char str[1100];
    int i, j, w;
    while(gets(str))
    {
        char str2[1000];
        int len ;

        scanf("%d", &w);
        len = strlen(str);

        for( i=0, j=0; i<=len; i = i+w, j++ )
        {
            str2[j] = str[i];
        }

        for( i=0; i<j; i++ )
        {
            printf("%c", str2[i]);
        }
        printf("\n");
    }

    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:14:11: error: 'gets' was not declared in this scope; did you mean 'getw'?
   14 |     while(gets(str))
      |           ^~~~
      |           getw
Language: C++

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

using namespace std;

int main()
{

    freopen("in.txt", "r", stdin);
//	freopen("out.txt", "w", stdout);


    char str[1100];
    int i, j, w;
    while(gets(str))
    {
        char str2[1000];
        int len ;

        scanf("%d", &w);
        len = strlen(str);

        for( i=0, j=0; i<=len; i = i+w, j++ )
        {
            str2[j] = str[i];
        }

        for( i=0; i<j; i++ )
        {
            printf("%c", str2[i]);
        }
        printf("\n");
    }

    return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:11: error: 'gets' was not declared in this scope; did you mean 'getw'?
   17 |     while(gets(str))
      |           ^~~~
      |           getw
Language: Java

import java.util.Scanner;

public class AAcrostic {

    public static void main(String[] args) {
        
        int w, l;
        String s;
        
        Scanner inp = new Scanner(System.in);
        
        s = inp.next();
        w = inp.nextInt();
        
        l = s.length();
        
        char v[] = s.toCharArray();
        
        for(int i=0; ; i++)
        {
            int a;
            a = (i*w);
            if(a < l)
            {
                System.out.print(v[a]);
            }
            else
            {
                break;
            }
            
            
        }
        
        
    }
    
}


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

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

int main() {
  string s;
  int n;
  cin >> s >> n;

  for (int i = 0; i < s.size(); i += n;) {
    cout << s[i];
  }
  cout << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:39: error: expected ')' before ';' token
   10 |   for (int i = 0; i < s.size(); i += n;) {
      |       ~                               ^
      |                                       )
a.cc:10:40: error: expected primary-expression before ')' token
   10 |   for (int i = 0; i < s.size(); i += n;) {
      |                                        ^
Language: C++

#include <bits/stdc++.h>
#define fi first
#define se second
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define drep(i,n) for(int i = (n)-1; i >= 0; --i)
#define srep(i,s,t) for (int i = s; i < t; ++i)
#define rng(a) a.begin(),a.end()
#define maxs(x,y) (x = max(x,y))
#define mins(x,y) (x = min(x,y))
#define limit(x,l,r) max(l,min(x,r))
#define lims(x,l,r) (x = max(l,min(x,r)))
#define isin(x,l,r) ((l) <= (x) && (x) < (r))
#define pb push_back
#define sz(x) (int)(x).size()
#define pcnt __builtin_popcountll
#define uni(x) x.erase(unique(rng(x)),x.end())
#define snuke srand((unsigned)clock()+(unsigned)time(NULL));
#define show(x) cout<<#x<<" = "<<x<<endl;
#define PQ(T) priority_queue<T,v(T),greater<T> >
#define bn(x) ((1<<x)-1)
#define dup(x,y) (((x)+(y)-1)/(y))
#define newline puts("")
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
typedef long long int ll;
typedef unsigned uint;
typedef unsigned long long ull;
typedef pair<int,int> P;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<ll> vl;
typedef vector<P> vp;
inline int in() { int x; scanf("%d",&x); return x;}
template<typename T>inline istream& operator>>(istream&i,v(T)&v)
{rep(j,sz(v))i>>v[j];return i;}
template<typename T>string join(const v(T)&v)
{stringstream s;rep(i,sz(v))s<<' '<<v[i];return s.str().substr(1);}
template<typename T>inline ostream& operator<<(ostream&o,const v(T)&v)
{if(sz(v))o<<join(v);return o;}
template<typename T1,typename T2>inline istream& operator>>(istream&i,pair<T1,T2>&v)
{return i>>v.fi>>v.se;}
template<typename T1,typename T2>inline ostream& operator<<(ostream&o,const pair<T1,T2>&v)
{return o<<v.fi<<","<<v.se;}
template<typename T>inline ll suma(const v(T)& a) { ll res(0); for (auto&& x : a) res += x; return res;}
const double eps = 1e-10;
const ll LINF = 1001002003004005006ll;
const int INF = 1001001001;
#define dame { puts("-1"); return 0;}
#define yn {puts("Yes");}else{puts("No");}
const int MX = 200005;
#define RET(ans) {cout<<ans<<endl;return 0;} 

    // 二次元ベクターの基本
    /*
    vector<vector<int>> dp; // 宣言
    dp.resize(n); // 1次元めの要素数決定
    dp[i].push_back(int); // プッシュバック
    rep(i,n){
        sort(dp[i].begin(),dp[i].end()); // 二次元めを昇順ソート
    }
    */

    // 整数スキャン（複数）
    /*
    int x,y,z;
    scanf("%d%d%d",&x,&y,&z);

    // n個の整数のスキャン
    /*
    ll a[n] = {};
    rep(i,n){
        scanf("%lld",&a[i]);
    }
    */

    // 文字列スキャン
    /*
    string s; cin >> s;
    */

    // n個の文字列スキャン
    /*
    vector<string> slist;
    rep(i,n){
        string s; cin >> s;
        slist.push_back(s);
    }
    */

int main() {
    string s; cin >> s;
    int n;
    cin >> n;

    rep(i,s.size()/w){
        cout << s[i*w];
    }
    cout << endl;
    return 0;
}
 
 


Compiler output:
a.cc: In function 'int main()':
a.cc:97:20: error: 'w' was not declared in this scope
   97 |     rep(i,s.size()/w){
      |                    ^
a.cc:4:38: note: in definition of macro 'rep'
    4 | #define rep(i,n) for(int i = 0; i < (n); ++i)
      |                                      ^
Language: C++

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

int main() {
  string S;
  int w;
  cin >> S >> w;
  
  string ans;
  for (int i = 0; i < S.size(); i += w) {
    ans += S[i];
  }
  cout << ans << endl;
}

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

#include <stdio.h>
#include <string.h>
int main()
{
    int i, w, l;
    char s[1010];
    gets(s);
    l=strlen(s);
    scanf("%d", &w);
    for(i=0; i<l; i=i+w)
        printf("%c", s[i]);

    return 0;
}

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

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

int main()

{
      char str[1001];
      scanf("%s",str);
      int n, i;
      scanf("%d",&n);
      for(i=0; i<strlen(str)';i=i+n)
             {
                   printf("%s",str[i]);
             }
printf("\n");
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:29: warning: missing terminating ' character
   11 |       for(i=0; i<strlen(str)';i=i+n)
      |                             ^
main.c:11:29: error: missing terminating ' character
   11 |       for(i=0; i<strlen(str)';i=i+n)
      |                             ^~~~~~~~
main.c:11:29: error: expected ';' before '{' token
   11 |       for(i=0; i<strlen(str)';i=i+n)
      |                             ^
      |                             ;
   12 |              {
      |              ~               
main.c:16:1: error: expected expression before 'return'
   16 | return 0;
      | ^~~~~~
main.c:17:1: error: expected expression before '}' token
   17 | }
      | ^
Language: C++

import java.util.*;

public class Main {
	
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		String s = in.nextLine();
		int n = in.nextInt();
		for(int i = 0;i < s.length();i += n) {
			System.out.print(s.charAt(i));
		}
	}
}


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

#include"Header.h"
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
#define INF 1e+9
 
 
int main() {
	string s;
	int n;
	cin >> s;
	cin >> n;
	for (int i = 0;i < s.length();i += n) {
		cout << s[i];
	}
	cout << endl;
 
	return 0;
}

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

-- acrostic.hs ---

-- author: Seong Yong-ju <sei40kr@gmail.com>

main :: IO ()
main = do
  s <- readLn
  w <- (read :: String -> Int) <$> getLine
  putStrLn $ map (s !!) [w,0 .. (length s)]


Compiler output:
a.cc:3:34: error: stray '@' in program
    3 | -- author: Seong Yong-ju <sei40kr@gmail.com>
      |                                  ^
a.cc:1:1: error: expected unqualified-id before '--' token
    1 | -- acrostic.hs ---
      | ^~
Language: C++

#include <iostream>
using namespace std;

int main()
{
	char s[1001];
	int w;

	cin >> s >> w;

	for (int i = 0; i <= strlen(s) / w; i++)
		cout << s[i * w];

	cout << endl;

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:30: error: 'strlen' was not declared in this scope
   11 |         for (int i = 0; i <= strlen(s) / w; 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(){
    int len, split;
    string res="";
    char str[10009];
    gets(str);

    // Lower conversion
    for(int i=0; str[i]!='\0'; i++){
        if(str[i] >= 65 && str[i] <= 92 ){
           str[i] = str[i] + 32;
        }
    }

    //puts(str);
    cin >> split;
    len = strlen(str);
    for(int i=0; i<len; i++){
//        cout << str[i] << " ";
        if(i%split == 0){
            res += str[i];
        }
    }
    cout << res << endl;

    return 0;
}


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

#include<bits/stdc++.h>

using namespace std;

int main(){
    int len, split;
    string res="";
    char str[1009];
    gets(str);
    cin >> split;
    len = strlen(str);
    for(int i=0; i<len; i++){
//        cout << str[i] << " ";
        if(i%split == 0){
            res += str[i];
        }
    }
    cout << res << endl;

    return 0;
}


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

#include<bit/stdc++.h>
using namespace std;
int main(){
        string s;
        int w;
        cin>>s>>w;
        cout<<s[0];
        for(int i=0; i<s.size(); i+w+1)cout<<s[i];

        return 0;
}


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

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

int main(void){
	int w;
	string S;
	cin >> S;
	cin >> w;
	for (int i = 0; i<=S.length(); i++) {
		if(i%w==0){
			cout << S[i];
		}
	}
	cout << '\n';
	return 0;
}


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

#include<cstdio>
#include<string>
int main(){
  std::string s; int n;
  cin >> s;
  scanf("%d", &n);
  int x=0;
  do{
    printf("%c", s[x]);
    x+=n;
  }while(x > s.length());
  putchar('\n');
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope
    5 |   cin >> s;
      |   ^~~
Language: C

#include<stdio.h>
#include<string.h>
 
int main(void){
 
  char s[1000] = {NULL};
  int w = 0,i = 0;
 
  (scanf("%s\n",s);
  (scanf("%d",&w);
  for(i= 0;i < strlen(s) / w + 1;i++){
    printf("%c",s[i*w]);
  }
  printf("\n");
 
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:6:19: error: initialization of 'char' from 'void *' makes integer from pointer without a cast [-Wint-conversion]
    6 |   char s[1000] = {NULL};
      |                   ^~~~
main.c:6:19: note: (near initialization for 's[0]')
main.c:9:19: error: expected ')' before ';' token
    9 |   (scanf("%s\n",s);
      |   ~               ^
      |                   )
main.c:17:1: error: expected declaration or statement at end of input
   17 | }
      | ^
Language: C++

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

int main() {
 int w, i;
 string S;

 cin >> S >> w;
if (S.size() % w == 0){
  for (i = 0; i < S.size() / w; i++){
   cout << S.at(w * i + 1);
 }
}
else{
  for(i = 0; i < S.size() / w + 1){
    cout << S.at(w * i + 1);
  }
}

}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:34: error: expected ';' before ')' token
   15 |   for(i = 0; i < S.size() / w + 1){
      |                                  ^
      |                                  ;
Language: C++

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

int main() {
 int w, i;
 string S;

 cin >> S >> w;
if (S.size() % w == 0){
  for (i = 0; i < S.size() / w; i++){
   cout << S.at(w * i + 1);
 }
else{
  for(i = 0; i < S.size() / w + 1){
    cout << S.at(w * i + 1);
  }
}

}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:1: error: expected '}' before 'else'
   13 | else{
      | ^~~~
a.cc:9:23: note: to match this '{'
    9 | if (S.size() % w == 0){
      |                       ^
a.cc:14:34: error: expected ';' before ')' token
   14 |   for(i = 0; i < S.size() / w + 1){
      |                                  ^
      |                                  ;
Language: C++

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

int main() {
 int w, i;
 string S;

 cin >> S >> w
if (S.size() % w == 0){
  for (i = 0; i < S.size() / w; i++){
   cout << S.at(w * i + 1):
 }
else{
  for(i = 0; i < S.size() / w + 1){
    cout << S.at(w * i + 1);
  }
}

}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:15: error: expected ';' before 'if'
    8 |  cin >> S >> w
      |               ^
      |               ;
    9 | if (S.size() % w == 0){
      | ~~             
a.cc:19:2: error: expected '}' at end of input
   19 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
 
int main(void){
 
  char s[1000] = {};
  int w = 0,i = 0;
 
 if(scanf("%s\n",s) == EOF){
    retur  -1;
 }
  if(scanf("%d",&w)!= 1){
    exit(1);
  }
 
  for(i= 0;i < strlen(s) / w + 1;i++){
    printf("%c",s[i*w]);
  }
  printf("\n");
 
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:5: error: 'retur' undeclared (first use in this function)
   11 |     retur  -1;
      |     ^~~~~
main.c:11:5: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

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

int main() {
	char *str;
	cin >> *str;
	char *S = str;
	int len = strlen(S);
	int w;
	cin >> w;
	int i;
	for (i = 0; w * i <= len; i++) {
		int p = w * i;
		cout << S[p] << endl;
	}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:19: error: 'strlen' was not declared in this scope
   10 |         int len = strlen(S);
      |                   ^~~~~~
a.cc:3:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    2 | #include<vector>
  +++ |+#include <cstring>
    3 | #include<string>
Language: C

#include<stdio.h>
#include<string.h>
#include<stdlib.h>
 
int main(void){
 
  char s[1000] = {};
  int w = 0,i = 0;
 
  ifscanf("%s\n",s) !=EOF){
    exit(1);
  }
  if(scanf("%d",&w)!= 1){
    exit(1);
  }
 
  for(i= 0;i < strlen(s) / w + 1;i++){
    printf("%c",s[i*w]);
  }
  printf("\n");
 
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:10:3: error: implicit declaration of function 'ifscanf'; did you mean 'vfscanf'? [-Wimplicit-function-declaration]
   10 |   ifscanf("%s\n",s) !=EOF){
      |   ^~~~~~~
      |   vfscanf
main.c:10:26: error: expected ';' before ')' token
   10 |   ifscanf("%s\n",s) !=EOF){
      |                          ^
main.c:10:26: error: expected statement before ')' token
Language: C++

#include<bits/stdc++.h>
#define ll long long
using namespace std;
string s;
vector<ll> s;
vector<char> c;
void solve(){
    int w;
    cin>>s>>w;
    for(int i=0;i<s.size();i+=w){
        c.push_back(s[i]);
    }
    for(int i=0;i<c.size();i++){
        cout<<c[i];
    }
    cout<<endl;
}
int main(){
    solve();
    return 0;
}

Compiler output:
a.cc:5:12: error: conflicting declaration 'std::vector<long long int> s'
    5 | vector<ll> s;
      |            ^
a.cc:4:8: note: previous declaration as 'std::string s'
    4 | string s;
      |        ^
Language: C++

#include<stdio.h>
#include<string.h>
char s[1000];
int main()
{
	int a,f=0;
	gets(s);
	scanf("%d",&a);
	for(int i=0;s[i]!='\0';i++)
	{
		if(f%a==0)
		{
			printf("%c",s[i]);
		}
		f++;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);
      |         ^~~~
      |         getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
char s[1000];
int main()
{
	int a,f=0;
	gets(s);
	scanf("%d",&a);
	for(int i=0;s[i]!='\0';i++)
	{
		if(f%a==0)
		{
			printf("%c",s[i]);
		}
		f++;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);
      |         ^~~~
      |         getw
Language: C++

#include<bits/stdc++.h>
using namespace std;
char s[1000];
int main()
{
	int a,f=0;
	gets(s);
	scanf("%d",&a);
	for(int i=0;s[i]!='\0';i++)
	{
		if(f%a==0)
		{
			printf("%c",s[i]);
			
		}
		f++;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    7 |         gets(s);
      |         ^~~~
      |         getw
Language: C

#include<stdio.h>

int main() {
	char S[1000];
	int w;
	int j;
	int max;

	scanf_s("%s", &S,1000);
	scanf_s("%d", &w);

	for (j = 0; S[j] != '\0'; ++j);
	max = j;

	printf("%c", S[0]);
	for (int i = 1; i <=max ; i++) {

		if (i % w != 0) {
		}
		else {
			printf("%c", S[i]);
		}
		
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:9: error: implicit declaration of function 'scanf_s'; did you mean 'scanf'? [-Wimplicit-function-declaration]
    9 |         scanf_s("%s", &S,1000);
      |         ^~~~~~~
      |         scanf