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

#include<stdio.h>
#include<string.h>
 
int main(void){
 
  char s[1000] = {};
  int w = 0,i = 0;
 
  if(scanf("%s\n",s) < 2){
    exit(1)
  }
  if(scanf("%d",&w) < 2){
    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:10:5: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
   10 |     exit(1)
      |     ^~~~
main.c:3:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
    2 | #include<string.h>
  +++ |+#include <stdlib.h>
    3 | 
main.c:10:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   10 |     exit(1)
      |     ^~~~
main.c:10:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
main.c:10:12: error: expected ';' before '}' token
   10 |     exit(1)
      |            ^
      |            ;
   11 |   }
      |   ~         
main.c:13:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   13 |     exit(1)
      |     ^~~~
main.c:13:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
main.c:13:12: error: expected ';' before '}' token
   13 |     exit(1)
      |            ^
      |            ;
   14 |   }
      |   ~
Language: C

#include<stdio.h>
#include<string.h>
 
int main(void){
 
  char s[1000] = {};
  int w = 0,i = 0;
 
  if(scanf("%s\n",s)==1){
    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:10:5: error: implicit declaration of function 'exit' [-Wimplicit-function-declaration]
   10 |     exit(1)
      |     ^~~~
main.c:3:1: note: include '<stdlib.h>' or provide a declaration of 'exit'
    2 | #include<string.h>
  +++ |+#include <stdlib.h>
    3 | 
main.c:10:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   10 |     exit(1)
      |     ^~~~
main.c:10:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
main.c:10:12: error: expected ';' before '}' token
   10 |     exit(1)
      |            ^
      |            ;
   11 |   }
      |   ~         
main.c:13:5: warning: incompatible implicit declaration of built-in function 'exit' [-Wbuiltin-declaration-mismatch]
   13 |     exit(1)
      |     ^~~~
main.c:13:5: note: include '<stdlib.h>' or provide a declaration of 'exit'
main.c:13:12: error: expected ';' before '}' token
   13 |     exit(1)
      |            ^
      |            ;
   14 |   }
      |   ~
Language: C++

#include <stdio.h>

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:21: error: 'strlen' was not declared in this scope
    9 |  for(int i = 0; i < strlen(s); i += c){
      |                     ^~~~~~
a.cc:2:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <stdio.h>
  +++ |+#include <cstring>
    2 |
Language: C++

#include <iostream>
using namespace std;

int main(int argc, char *argv[])
{
	int i;
    char str[2000];
	char result[2000];
	char auth[1001];
	int w;
	int result_index = 0;

	memset(str, 0, 2000);
	memset(result, 0, 2000);

	cin >> str;
	cin >> w;

	for (i = 0; i < 1000; i++) {
		if (str[i] == '\0')
			break;
		if (i % w == 0) {
			result[result_index] = str[i];
			result_index++;
		}			
	}


    cout << result;

	return 0;
}


Compiler output:
a.cc: In function 'int main(int, char**)':
a.cc:13:9: error: 'memset' was not declared in this scope
   13 |         memset(str, 0, 2000);
      |         ^~~~~~
a.cc:2:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    1 | #include <iostream>
  +++ |+#include <cstring>
    2 | using namespace std;
Language: C++

int main()
{
	string str;
	int n;
	int len;
	int cnt;
	int mem;
	cin >> str;
	cin >> n;

	len = str.length();

	cnt = (len / n+1);

	for (int i = 1; i <=cnt; i++)
	{
		if (i == 1)
		{
			cout << str.at(0);
			mem = n;
		}


		else
		{
			cout << str.at(mem);
			mem += n;
		}
			

	}




}

Compiler output:
a.cc: In function 'int main()':
a.cc:3:9: error: 'string' was not declared in this scope
    3 |         string str;
      |         ^~~~~~
a.cc:8:9: error: 'cin' was not declared in this scope
    8 |         cin >> str;
      |         ^~~
a.cc:8:16: error: 'str' was not declared in this scope; did you mean 'std'?
    8 |         cin >> str;
      |                ^~~
      |                std
a.cc:19:25: error: 'cout' was not declared in this scope
   19 |                         cout << str.at(0);
      |                         ^~~~
a.cc:26:25: error: 'cout' was not declared in this scope
   26 |                         cout << str.at(mem);
      |                         ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
const int maxn=2e5+10;
int a[maxn*4];
int vis[maxn*4];
int b[maxn*4];
int main()
{
    string s;
    int x;
    cin>>s>>x;
    for(i=0;i<s.length();i+=x){
        cout<<s[i];
    }
    cout<<endl
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'i' was not declared in this scope
   12 |     for(i=0;i<s.length();i+=x){
      |         ^
a.cc:15:15: error: expected ';' before 'return'
   15 |     cout<<endl
      |               ^
      |               ;
   16 |     return 0;
      |     ~~~~~~
Language: C++

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


int main() {
    string s;
    int w;
    cin >> s >> w;
   
    string a;
    ans[0] = s[0];

    for (int i = 1; i <= 1000; i++) {
        a[i] = a[i*w];
    }
    cout << a[0]<<a[1]<<a[2]<<a[3]<<a[4]<<a[5]<<a[6]<<a[7]<<a[8]<<a[9]<<a[10]<<a[11]<<a[12]<<a[13]<<a[14]<<a[15]<<a[16]<<a[17]<<a[18]<<a[19]<<a[20]<<endl;

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'ans' was not declared in this scope; did you mean 'abs'?
   14 |     ans[0] = s[0];
      |     ^~~
      |     abs
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,i;
	char c[1001];
	gets(c);
	scanf("%d",&n);
	for(i=0;i<=strlen(c);i+=n)
	{
		printf("%c",c[i]);
	}
	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(c);
      |         ^~~~
      |         getw
Language: C

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

int main(void){

  char s[1000] = {};
  int w = 0,i = 0;

  scanf("%s",s);
　scanf("%d",&w);

  for(i= 0;i < strlen(s);i++){
    printf("%c",s[i*w]);
  }
  printf("\n");

  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:10:1: error: stray '\343' in program
   10 | <U+3000>scanf("%d",&w);
      | ^~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long l;
typedef string ss;
typedef char c;
int main(){
    ss c;
    l a;
    cin>>c>>a;
    for(l i=0;i<size ()c;i++){
        cout<<c[i*3+1];
    }
    cout<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:22: error: no matching function for call to 'size()'
   10 |     for(l i=0;i<size ()c;i++){
      |                 ~~~~~^~
In file included from /usr/include/c++/14/string:53,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/range_access.h:262:5: note: candidate: 'template<class _Container> constexpr decltype (__cont.size()) std::size(const _Container&)'
  262 |     size(const _Container& __cont) noexcept(noexcept(__cont.size()))
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:262:5: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/14/bits/range_access.h:272:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::size_t std::size(const _Tp (&)[_Nm])'
  272 |     size(const _Tp (&)[_Nm]) noexcept
      |     ^~~~
/usr/include/c++/14/bits/range_access.h:272:5: note:   candidate expects 1 argument, 0 provided
a.cc:10:24: error: expected ';' before 'c'
   10 |     for(l i=0;i<size ()c;i++){
      |                        ^
      |                        ;
a.cc:10:25: error: expected ')' before ';' token
   10 |     for(l i=0;i<size ()c;i++){
      |        ~                ^
      |                         )
a.cc:10:26: error: 'i' was not declared in this scope
   10 |     for(l i=0;i<size ()c;i++){
      |                          ^
Language: C++

#include<bits/stdc++.h>
#define ll long long
#define P pair<int, int>
#define PP pair<int,pair<int, int>>
#define pb push_back
#define pp pop_back
#define lson root << 1
#define INF (int)2e9 + 7
#define rson root << 1 | 1
#define LINF (unsigned long long int)1e18
#define mem(arry, in) memset(arry, in, sizeof(arry))
using namespace std;

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







/*
int n;
int a[400], b[400], sum[400];
map<string, int> mp;

int main()
{
    cin >> n;
    int t = 0;
    for(int i = 1; i <= n; i++) {
        string tp;
        cin >> tp;
        if(!mp[tp]) mp[tp] = ++t;
        a[i] = mp[tp];
        b[i] = tp.size();
        sum[i] =
    }



    return 0;
}
*/


Compiler output:
a.cc: In function 'int main()':
a.cc:18:18: error: expected ';' before 'int'
   18 |     cin >> s >> x
      |                  ^
      |                  ;
   19 |     int n = s.size();
      |     ~~~           
a.cc:20:24: error: 'n' was not declared in this scope
   20 |     for(int i = 0; i < n; i += x) cout << s[i];
      |                        ^
Language: C

#include <stdio.h>
 
int main ()
{
char S[1000];
int w;
int n;
 
scanf ("%c", S);
 
scanf ("%d", &w);
 
for (n=0; n=999; n=n+w){
printf ("%c", S[n] );
}
}
return 0;

Compiler output:
main.c:17:1: error: expected identifier or '(' before 'return'
   17 | return 0;
      | ^~~~~~
Language: C

#include <stdio.h>
 
int main ()
{
char S[1000];
int w;
int n;
 
scanf ("%c", S);
 
scanf ("%d", &w);
 
for (n=0; n=999, n=n+w){
printf ("%c", S[n] );
}
}
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:23: error: expected ';' before ')' token
   13 | for (n=0; n=999, n=n+w){
      |                       ^
      |                       ;
main.c: At top level:
main.c:17:1: error: expected identifier or '(' before 'return'
   17 | return 0;
      | ^~~~~~
main.c:18:1: error: expected identifier or '(' before '}' token
   18 | }
      | ^
Language: Java

package text;

public class main {
	public static void main(String[] args) {
		String s = args[0];
		int w = Integer.parseInt(args[1]);
		String str[] = s.split("");
		
		String st = "";
		
		for(int i=0;i < str.length;i =  i + w) {
			st = st + str[i];
		}
		System.out.println(st);
	}
}


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

#include <bits/stdc++.h>

using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:13: error: expected initializer before '==' token
    8 |   int count == 0;
      |             ^~
Language: C

#include <stdio.h>

int main(){
    int w = 0;
    int i = 0;
    char s[1002] = {0};
    while((s[i] = getc()) != '\n'){
        i++;
    }
    scanf("%s", s);
    scanf("%d", &w);

    i = 0;

    while (s[i] != '\n') {
        if (i % w == 0) {
            printf("%c", s[i]);
        }
        i++;
    }
}

Compiler output:
main.c: In function 'main':
main.c:7:19: error: too few arguments to function 'getc'
    7 |     while((s[i] = getc()) != '\n'){
      |                   ^~~~
In file included from main.c:1:
/usr/include/stdio.h:576:12: note: declared here
  576 | extern int getc (FILE *__stream) __nonnull ((1));
      |            ^~~~
Language: C

#include <stdio.h>

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

scanf ("%c", S);

scanf ("%d", w);

for ( n=0, n=999, n++ ){
if ( n % w == 0){
printf ("%c", S[n] )
}
}
return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:22: error: expected ';' before ')' token
   13 | for ( n=0, n=999, n++ ){
      |                      ^~
      |                      ;
main.c:13:23: error: expected expression before ')' token
   13 | for ( n=0, n=999, n++ ){
      |                       ^
main.c:15:21: error: expected ';' before '}' token
   15 | printf ("%c", S[n] )
      |                     ^
      |                     ;
   16 | }
      | ~
Language: C++

#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <vector>
#include <algorithm>
#include <functional>
#include <ccomplex>
#include <unordered_map>


using namespace std;
#define MAX 100000

int main(){
    char S[1005];
    int W;
    char ans[1005];

    scanf("%s%d", S, &W);
    int cnt = 0;
    for (int i = 0; i < strlen(S); i += W){
        ans[cnt] = S[i];
        cnt++;
    }
    ans[cnt] = '\0';
    printf("%s", ans);

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:22:25: error: 'strlen' was not declared in this scope
   22 |     for (int i = 0; i < strlen(S); i += W){
      |                         ^~~~~~
a.cc:9:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    8 | #include <ccomplex>
  +++ |+#include <cstring>
    9 | #include <unordered_map>
Language: C

#include<stdio.h>

int main(){
  char S[1000];
  int w;
  int A_i;
  
  scanf("%s",&S,256);
  scanf("%d",&w);
  
  A_1=S[1];
  printf("%s",A_1);
  
  for(int i=1;i<=1000;i++){
    if(i%w==0){
      A_i=S[i];
      printf("%s",A_i);
    }
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:3: error: 'A_1' undeclared (first use in this function); did you mean 'A_i'?
   11 |   A_1=S[1];
      |   ^~~
      |   A_i
main.c:11:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

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

int main(void) {
	string a="";
	int s;
	cin >> a >> s;
	for(int i=0; i<size(a); i+=s){
		if(a[i] == NULL)break;
		cout << a[i];
	}
	cout << endl;

	return 0;
}

Compiler output:
a.cc:5:17: error: 'vector' is not a namespace-name
    5 | using namespace vector;
      |                 ^~~~~~
a.cc: In function 'int main()':
a.cc:12:28: warning: NULL used in arithmetic [-Wpointer-arith]
   12 |                 if(a[i] == NULL)break;
      |                            ^~~~
Language: Java

import java.util.*;

public class Main {

	public static void main(String[] args) {
		// make new Scanner.
		Scanner sc = new Scanner(System.in);
		String str = sc.nextLine();
		int t = Integer.parseInt(sc.next());
		
		while (true) {
			if (t >= str.length()) {
				System.out.println(str.substring(0, 1));
				break;
			} else {
				System.out.print(str.substring(0, 1));
				str = str.substring(t);
			}
		}
		
		// Listに格納.
//		List<Integer> list = inList(sc,n);
		

		// close Scanner
		sc.close();

	}

Compiler output:
Main.java:28: error: reached end of file while parsing
	}
	 ^
1 error
Language: C++

#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
// #include <boost/multiprecision/cpp_int.hpp> 

#define gc getchar//_unlocked
#define pc putchar//_unlocked
#define ll long long
#define ld long double
#define pb push_back
#define mp make_pair
#define pp pair<int,int>
#define ppl pair<ll,ll>
#define bigint boost::multiprecision::cpp_int
#define finp ios_base::sync_with_stdio(0);cin.tie(0);
#define bc __builtin_popcountll
#define afor(i,a,b) for(int i=a;i<=b;++i)
#define bfor(i,a,b) for(int i=a;i>=b;--i)
#define vi vector<int>
#define vpp vector<pp>
#define vll vector<ll>
#define fr first
#define se second

using namespace std;
using namespace __gnu_pbds;

char putnb[20];
void putn(ll n) {if(!n)pc('0');if(n<0)pc('-'),n=0-n;int pi=0;while(n)putnb[pi++]=(n%10)+'0',n/=10;while(pi)pc(putnb[--pi]);}
void sci(int *x) {register char c = gc();*x = 0;for(; (c<48)||(c>57);c = gc());for(; (c>47)&&(c<58);c = gc())*x = (int)((((*x)<<1) + ((*x)<<3)) + c - 48);}
void scll(ll *x)  {register char c = gc();*x = 0;for(; (c<48)||(c>57);c = gc());for(; (c>47)&&(c<58);c = gc())*x =  (ll)((((*x)<<1) + ((*x)<<3)) + c - 48);}
ll fp(ll a,ll b,ll c) {if(b==0)return 1%c; if(b==1)return a%c; ll ret=fp(a,b/2,c); ret=(ret*ret)%c; if(b&1)ret=(ret*a)%c; return ret;}

const ll mod=1e9 +7;
const ll mod2=1999999973;
const ll inf=1e18;
const int infs=1e9 + 1000;
const int N=100000;
const long double PI = acos(-1);

template <typename T>
using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;



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

Compiler output:
a.cc: In function 'void sci(int*)':
a.cc:30:33: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   30 | void sci(int *x) {register char c = gc();*x = 0;for(; (c<48)||(c>57);c = gc());for(; (c>47)&&(c<58);c = gc())*x = (int)((((*x)<<1) + ((*x)<<3)) + c - 48);}
      |                                 ^
a.cc: In function 'void scll(long long int*)':
a.cc:31:34: warning: ISO C++17 does not allow 'register' storage class specifier [-Wregister]
   31 | void scll(ll *x)  {register char c = gc();*x = 0;for(; (c<48)||(c>57);c = gc());for(; (c>47)&&(c<58);c = gc())*x =  (ll)((((*x)<<1) + ((*x)<<3)) + c - 48);}
      |                                  ^
a.cc: In function 'int main()':
a.cc:51:1: error: expected initializer before 'cin'
   51 | cin>>s>>k;
      | ^~~
a.cc:52:27: error: 'k' was not declared in this scope
   52 | for(int i=0;i<s.size();i+=k)
      |                           ^
Language: C

#include<stdio.h>

int main(){
  char S[1000];
  int w;
  int A_i;
  
  scanf("%s",&S);
  scanf("%d",&w);
  
  A_1=S[1];
  printf("%s",A_1);
  
  for(int i=1;i<=1000;i++){
    if(i%w==0){
      A_i=S[i];
      printf("%s",A_i);
    }
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:11:3: error: 'A_1' undeclared (first use in this function); did you mean 'A_i'?
   11 |   A_1=S[1];
      |   ^~~
      |   A_i
main.c:11:3: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int main(void)
{
	int w,i;
	char S[1000];
	scanf("%s",S);
	scanf("%d",w);
	
	for(i=0;i<n;i++)
	{
		printf("%c",S[i]);
		if((i+1)%3==0) printf("\n");
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:9:19: error: 'n' undeclared (first use in this function)
    9 |         for(i=0;i<n;i++)
      |                   ^
main.c:9:19: note: each undeclared identifier is reported only once for each function it appears in
Language: Java

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


public class main {

	public static void main(String[] args) throws Exception {
		
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String line = br.readLine();
        String line2 = br.readLine();
        
        String boxx[] = line.split("");
        
        
        
        int n = boxx.length;
        int k = Integer.parseInt(line2);
        String ans =("");
        
        for(int i=0;i<n;i++){
        //    System.out.println(i);
        	if((i-1)%k == 0){
        		ans+=boxx[i];
        	}
        	
        	
        }
        System.out.println(ans);
	}

}


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

using namespace std;

int main () {
  string S;
  int w;
  string result = "";
  cin >> S;
  cin >> w;

  for(int i = 0; i < S.length(); i+=w){
    result += S[i];
  }
  
  cout << result << 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: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:6:9: error: expected ';' before 'result'
    6 |   string result = "";
      |         ^~~~~~~
      |         ;
a.cc:7:3: error: 'cin' was not declared in this scope
    7 |   cin >> S;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | using namespace std;
a.cc:7:10: error: 'S' was not declared in this scope
    7 |   cin >> S;
      |          ^
a.cc:11:5: error: 'result' was not declared in this scope
   11 |     result += S[i];
      |     ^~~~~~
a.cc:14:3: error: 'cout' was not declared in this scope
   14 |   cout << result << endl;
      |   ^~~~
a.cc:14:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:14:11: error: 'result' was not declared in this scope
   14 |   cout << result << endl;
      |           ^~~~~~
a.cc:14:21: error: 'endl' was not declared in this scope
   14 |   cout << result << 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 <stdlib.h>
#include <stdio.h>

#include <string.h>

int main(){
	char a[1001];
	gets(a);
	int w;
	scanf("%d",&w);
	for(int i=0;i<strlen(a);i=i+w){
		printf("%c",a[i]);
	}
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |         gets(a);
      |         ^~~~
      |         getw
Language: C

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

int main(void)
{
  char S;
  int w,len;
  int i;
  scanf("%s", S);
  scanf("%d", w);
  len = strlen( S );
  for(i=0;i+=w;i<=len){
      printf("%c", S[i]);
  }
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:11:17: error: passing argument 1 of 'strlen' makes pointer from integer without a cast [-Wint-conversion]
   11 |   len = strlen( S );
      |                 ^
      |                 |
      |                 char
In file included from main.c:2:
/usr/include/string.h:407:35: note: expected 'const char *' but argument is of type 'char'
  407 | extern size_t strlen (const char *__s)
      |                       ~~~~~~~~~~~~^~~
main.c:13:21: error: subscripted value is neither array nor pointer nor vector
   13 |       printf("%c", S[i]);
      |                     ^
Language: C++

#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <string.h>
using namespace std;
int main(){
	char a[1001];
	gets(a);
	int w;
	cin>>w;
	for(int i=0;i<strlen(a);i=i+w){
		printf("%c",a[i]);
	}
	return 0;
} 

Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
    8 |         gets(a);
      |         ^~~~
      |         getw
Language: C++

#include <cstdio>
#include <algorithm>
#include <c++/iostream>

using namespace std;
int main() {
    string S;
    int w;
    int i;
    cin >> S;
    cin >> w;

    for(i=0; w*i+1 < S.length(); i++){
        printf("%c", S[i*w+1]);
    }
    if(i*w+1<=S.length()) {
        printf("%c", i * w + 1);
    }


}

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

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

int main(void)
{
  char S[2000];
  int w,len;
  scanf("%s", S);
  scanf("%d", w);
  len = strlen( S );
  for(i=0;i+=w;i<=len){
      printf("%c", S[i]);
  }
  return 0;
}


Compiler output:
main.c: In function 'main':
main.c:11:7: error: 'i' undeclared (first use in this function)
   11 |   for(i=0;i+=w;i<=len){
      |       ^
main.c:11:7: note: each undeclared identifier is reported only once for each function it appears in
Language: C++

//
//  main.cpp
//  AT
//
//  Created by 黄道煜 on 2018/7/7.
//  Copyright © 2018年 黄道煜. All rights reserved.
//

#include <iostream>
#include <cstdio>
#include <algorithm>
#define LL long long
using namespace std;

LL w;
char s[100000000];

int main()
{
    scanf("%s", s);
    scanf("%lld", &w);
    LL len=strlen(s);
    for(LL i=0; i<=len; i++) if(i%w==0) printf("%c", s[i]);
}


Compiler output:
a.cc: In function 'int main()':
a.cc:22:12: error: 'strlen' was not declared in this scope
   22 |     LL len=strlen(s);
      |            ^~~~~~
a.cc:12:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
   11 | #include <algorithm>
  +++ |+#include <cstring>
   12 | #define LL long long
Language: C++

#include <stdio.h>
int main(){
int i,w;
char s[1001];
  scanf("%s",s);
  scanf("%d",&w);
  for(i=0;i!='\0';i+=w){
    printf("%c"s[i]);
  }
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:12: error: unable to find string literal operator 'operator""s' with 'const char [3]', 'long unsigned int' arguments
    8 |     printf("%c"s[i]);
      |            ^~~~~
Language: C++

#include <cstdio>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <string>
#include <cmath>
#include <map>
using namespace std;
typedef long long LL;
char s[100050];
int w;
int main(){
	gets(s+1);
	scanf("%d",&w);
	int len=strlen(s+1);
	for(int i=1;i<=len;i+=w){
		printf("%c",s[i]);
	}
	printf("\n");
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: 'gets' was not declared in this scope; did you mean 'getw'?
   14 |         gets(s+1);
      |         ^~~~
      |         getw
Language: C++

￼#include <bits/stdc++.h>

using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);

  string s;
  int w;
  cin >> s >> w;

  string result;
  for (int i = 0; i < s.size(); i += w) {
    result += s[i];
  }
  cout << result << "\n";
}


Compiler output:
a.cc:1:2: error: stray '#' in program
    1 | ￼#include <bits/stdc++.h>
      |  ^
a.cc:1:1: error: '\U0000fffc' does not name a type
    1 | ￼#include <bits/stdc++.h>
      | ^
a.cc: In function 'int main()':
a.cc:5:3: error: 'ios_base' has not been declared
    5 |   ios_base::sync_with_stdio(false);
      |   ^~~~~~~~
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin.tie(NULL);
      |   ^~~
a.cc:6:11: error: 'NULL' was not declared in this scope
    6 |   cin.tie(NULL);
      |           ^~~~
a.cc:1:1: note: 'NULL' is defined in header '<cstddef>'; this is probably fixable by adding '#include <cstddef>'
  +++ |+#include <cstddef>
    1 | ￼#include <bits/stdc++.h>
a.cc:8:3: error: 'string' was not declared in this scope
    8 |   string s;
      |   ^~~~~~
a.cc:10:10: error: 's' was not declared in this scope
   10 |   cin >> s >> w;
      |          ^
a.cc:12:9: error: expected ';' before 'result'
   12 |   string result;
      |         ^~~~~~~
      |         ;
a.cc:14:5: error: 'result' was not declared in this scope
   14 |     result += s[i];
      |     ^~~~~~
a.cc:16:3: error: 'cout' was not declared in this scope
   16 |   cout << result << "\n";
      |   ^~~~
a.cc:16:11: error: 'result' was not declared in this scope
   16 |   cout << result << "\n";
      |           ^~~~~~
Language: C++

#include<>stdio.h
int main(){
int i,w;
char s[1001];
  scanf("%s"s);
  scanf("%d",&w);
  for(i=0;i!='\0';i+=w){
    printf("%c"s[i]);
  }
  return 0;
}

Compiler output:
a.cc:1:16: warning: extra tokens at end of #include directive
    1 | #include<>stdio.h
      |                ^
a.cc:1:9: fatal error: >stdi: No such file or directory
    1 | #include<>stdio.h
      |         ^~~~~~~
compilation terminated.
Language: Java

import java.util.*;
public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String s = sc.nextLine();
        int n = sc.nextInt();
        StringBuilder sb = new StringBuilder();
        for (int i=0; i<s.length(); i++) {
            if (i % w == 0) {
                sb.append(s.charAt(i));
            }
        }
        System.out.println(sb.toString());
    }
}

Compiler output:
Main.java:9: error: cannot find symbol
            if (i % w == 0) {
                    ^
  symbol:   variable w
  location: class Main
1 error
Language: Java

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

class Main {
  public static void main(String[] args) throws Exception{
    try (Scanner sc = new Scanner(System.in)){
      String s = sc.next();
      int w = sc.nextInt();
      String tokens = s.split("");
      for (int i = 0; i < max; i *= w) {
        System.out.print(tokens[i]);
      }
      System.out.println();
    }
  }
}

Compiler output:
Main.java:9: error: incompatible types: String[] cannot be converted to String
      String tokens = s.split("");
                             ^
Main.java:10: error: cannot find symbol
      for (int i = 0; i < max; i *= w) {
                          ^
  symbol:   variable max
  location: class Main
Main.java:11: error: array required, but String found
        System.out.print(tokens[i]);
                               ^
3 errors
Language: C++

#include <bits/stdc++.h>
using namespace std;
#pragma comment(linker, "/STACK:1024000000,1024000000")
#define mem(a,b) memset((a),(b),sizeof(a))
#define MP make_pair
#define pb push_back
#define fi first
#define se second
#define sz(x) (int)x.size()
#define all(x) x.begin(),x.end()
#define _GLIBCXX_PERMIT_BACKWARD_HASH
#include <ext/hash_map>
using namespace __gnu_cxx;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<int,int> PII;
typedef pair<ll,ll> PLL;
typedef vector<int> VI;
typedef vector<ll> VL;
struct str_hash{size_t operator()(const string& str)const{return __stl_hash_string(str.c_str());}};
const int INF=0x3f3f3f3f;
const ll LLINF=0x3f3f3f3f3f3f3f3f;
const double PI=acos(-1.0);
const double eps=1e-4;
const int MAX=2e5+10;
const ll mod=1e9+7;
/***************************************  head  **********************************************/
int main()
{
	string s;
	while(cin>>s)
	{
		int x;
		string ans="";
		for(i=0;i<s.length();i++)
		{
			if(i%x==0) ans+=s[i];
		}
		cout<<ans<<"\n";
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:35:21: error: 'i' was not declared in this scope
   35 |                 for(i=0;i<s.length();i++)
      |                     ^
Language: C++

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

int main() {
  string str;
  cin >> str;
  int w; cin >> w;
  int I = 0;
  for(auto x : str) {
    if(i % w == 0) cout << x;
    I++;
  }
  cout << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:8: error: 'i' was not declared in this scope
   10 |     if(i % w == 0) cout << x;
      |        ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
char s[100000233];
int w=0,n;
int main(){
	gets(s);
	n=strlen(s);
	scanf("%d",&w);
	for (int i=0;i<n;i+=w)
		printf("%c",s[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(s);
      |         ^~~~
      |         getw
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() {
  std::string s;
  i32 n;
  std::cin >> s >> n;
  std::string res;
  rep(i, 0, s.size(), n) {
    res += s[i];
  }
  pr(res);
}


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

#include<bits/stdc++.h>

using namespace std;
typedef long long LL;

#ifdef BTK
#define DEBUG if(1)
#else
#define CIN_ONLY if(1)
struct cww {cww() {CIN_ONLY{ios::sync_with_stdio(false); cin.tie(0);}}
}star;
#define DEBUG if(0)
#endif

#define ALL(v) (v).begin(),(v).end()
#define REC(ret, ...) std::function<ret (__VA_ARGS__)>
template <typename T>inline bool chmin(T &l, T r){bool a = l>r; if (a)l = r; return a;}
template <typename T>inline bool chmax(T &l, T r){bool a = l<r; if (a)l = r; return a;}
template <typename T>istream& operator>>(istream &is, vector<T> &v){for (auto &it : v)is >> it;return is;}

class range {private: struct I { int x; int operator*() { return x; }bool operator!=(I& lhs) { return x<lhs.x; }void operator++() { ++x; } }; I i, n;public:range(int n) :i({ 0 }), n({ n }) {}range(int i, int n) :i({ i }), n({ n }) {}I& begin() { return i; }I& end() { return n; }};

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

	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:27:36: error: expected ')' before '{' token
   27 |         for (int i: range(s.size()) {
      |             ~                      ^~
      |                                    )
Language: C++


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


int main()
{
	long long int n, s, i, j, k, l, m, sum,N,a,b,ans,cc,cnt;
	sum = 0;
	
	int flag = 0;
	char S[1001];
	cin >> S;
	int w;
	cin >> w;
	n = strlen(S);
	for (i = 0; i < strlen(S); i += w) {
		cout << S[i];
	}



    return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:21:13: error: 'strlen' was not declared in this scope
   21 |         n = strlen(S);
      |             ^~~~~~
a.cc:8:1: note: 'strlen' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    7 | #include<cmath>
  +++ |+#include <cstring>
    8 | using namespace std;
Language: C++

/#include <bits/stdc++.h>
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define printVec(v) printf("{"); for (const auto& i : v) { std::cout << i << ", "; } printf("}\n");
#define degreeToRadian(deg) (((deg)/360)*2*M_PI)
#define radianTodegree(rad) (((rad)/2/M_PI)*360)
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; }
using namespace std;
using P = pair<int,int>;
using ll = long long;
const ll INF = 1LL<<60;
const int MOD = 1e9 + 7;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};

//cin.tie(0);ios::sync_with_stdio(false);
//cout << fixed << setprecision(15) << y << endl;
int main() {
  double N, M, D;
  cin >> N >> M >> D;
  double p;
  if (D == 0) {
    p = N / (N * N);
  } else {
    p = (N - D) * 2.0 / (N * N);
  }
  cout << fixed << setprecision(15);
  cout << (M - 1) * p << endl;
  return 0;
}


Compiler output:
a.cc:1:2: error: stray '#' in program
    1 | /#include <bits/stdc++.h>
      |  ^
a.cc:1:1: error: expected unqualified-id before '/' token
    1 | /#include <bits/stdc++.h>
      | ^
a.cc:9:11: error: 'pair' does not name a type
    9 | using P = pair<int,int>;
      |           ^~~~
a.cc: In function 'int main()':
a.cc:20:3: error: 'cin' was not declared in this scope
   20 |   cin >> N >> M >> D;
      |   ^~~
a.cc:1:1: note: 'std::cin' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
  +++ |+#include <iostream>
    1 | /#include <bits/stdc++.h>
a.cc:27:3: error: 'cout' was not declared in this scope
   27 |   cout << fixed << setprecision(15);
      |   ^~~~
a.cc:27:3: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:27:11: error: 'fixed' was not declared in this scope
   27 |   cout << fixed << setprecision(15);
      |           ^~~~~
a.cc:1:1: note: 'std::fixed' is defined in header '<ios>'; this is probably fixable by adding '#include <ios>'
  +++ |+#include <ios>
    1 | /#include <bits/stdc++.h>
a.cc:27:20: error: 'setprecision' was not declared in this scope
   27 |   cout << fixed << setprecision(15);
      |                    ^~~~~~~~~~~~
a.cc:1:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
  +++ |+#include <iomanip>
    1 | /#include <bits/stdc++.h>
a.cc:28:26: error: 'endl' was not declared in this scope
   28 |   cout << (M - 1) * p << endl;
      |                          ^~~~
a.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; this is probably fixable by adding '#include <ostream>'
  +++ |+#include <ostream>
    1 | /#include <bits/stdc++.h>
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,n) for(ll i=0;i<n;i++)
#define repl(i,l,r) for(ll i=(l);i<(r);i++)
#define per(i,n) for(ll i=n-1;i>=0;i--)
#define perl(i,r,l) for(ll i=r-1;i>=l;i--)
#define fi first
#define se second
#define pb push_back
#define ins insert
#define all(x) (x).begin(),(x).end()
using ll=long long;
using vl=vector<ll>;
using vvl=vector<vector<ll>>;
const ll MOD=1000000007;
const ll MOD9=998244353;
const int inf=1e9+10;
const ll INF=4e18;
const ll dy[8]={1,0,-1,0,1,1,-1,-1};
const ll dx[8]={0,-1,0,1,1,-1,1,-1};
using Graph = vector<vector<int>>;
double nCk(int n, int k) {
double res=1.0;
for(int i=0; i<n; i++){
res*=0.5;}
for(int i=0; i<k; i++){
res*=(double)(n-i);
res/=(double)(k-i);
}
return res;}
struct edge{ll to, cost;};
typedef pair<ll,ll> P;
struct graph{
  ll V;
  vector<vector<edge> > G;
  vector<ll> d;

  graph(ll n){
    init(n);
  }

  void init(ll n){
    V = n;
    G.resize(V);
    d.resize(V);
    rep(i,V){
      d[i] = INF;
    }
  }

  void add_edge(ll s, ll t, ll cost){
    edge e;
    e.to = t, e.cost = cost;
    G[s].push_back(e);
  }

  void dijkstra(ll s){
    rep(i,V){
      d[i] = INF/10;
    }
    d[s] = 0;
    priority_queue<P,vector<P>, greater<P> > que;
    que.push(P(0,s));
    while(!que.empty()){
      P p = que.top(); que.pop();
      ll v = p.second;
      if(d[v]<p.first) continue;
      for(auto e : G[v]){
        if(d[e.to]>d[v]+e.cost){
          d[e.to] = d[v]+e.cost;
          que.push(P(d[e.to],e.to));
        }
      }
    }
  }
};
int main() {
  cout << fixed << setprecision(10);
  long double a,b,c; cin>>a>>b>>c;
  if(c==0){
  cout << (b-1)/a << endl;}
  else{
    cout << 2*(a-c)*(b-1)/a*a<< endl;}
        


Compiler output:
a.cc: In function 'int main()':
a.cc:83:39: error: expected '}' at end of input
   83 |     cout << 2*(a-c)*(b-1)/a*a<< endl;}
      |                                       ^
a.cc:77:12: note: to match this '{'
   77 | int main() {
      |            ^
Language: C++

#define int long long
typedef pair<int,int> P;
int INF = 1e18;
int mod = 1e9+7;
int dx[4] = {1, 0, -1, 0};
int dy[4] = {0, 1, 0, -1};
signed main() {
    double n,m,d;
    cin >> n >> m >> d;
    cout << fixed << setprecision(20) << (m-1)/n << endl;
}


Compiler output:
a.cc:2:9: error: 'pair' does not name a type
    2 | typedef pair<int,int> P;
      |         ^~~~
a.cc: In function 'int main()':
a.cc:9:5: error: 'cin' was not declared in this scope
    9 |     cin >> n >> m >> d;
      |     ^~~
a.cc:10:5: error: 'cout' was not declared in this scope
   10 |     cout << fixed << setprecision(20) << (m-1)/n << endl;
      |     ^~~~
a.cc:10:13: error: 'fixed' was not declared in this scope
   10 |     cout << fixed << setprecision(20) << (m-1)/n << endl;
      |             ^~~~~
a.cc:10:22: error: 'setprecision' was not declared in this scope
   10 |     cout << fixed << setprecision(20) << (m-1)/n << endl;
      |                      ^~~~~~~~~~~~
a.cc:10:53: error: 'endl' was not declared in this scope
   10 |     cout << fixed << setprecision(20) << (m-1)/n << endl;
      |                                                     ^~~~
Language: C++

#import<ios>
main(n,m,d){scanf("%d%d%d",&n,&m,&d)<printf("%f",(2-!d-d*2./n)*--m/n);}

Compiler output:
a.cc:1:2: warning: #import is a deprecated GCC extension [-Wdeprecated]
    1 | #import<ios>
      |  ^~~~~~
a.cc:2:5: error: expected constructor, destructor, or type conversion before '(' token
    2 | main(n,m,d){scanf("%d%d%d",&n,&m,&d)<printf("%f",(2-!d-d*2./n)*--m/n);}
      |     ^
Language: C++

#include <iostream>
using namespace std;

int main(){
  double n,m,d;
  cin>>n>>m>>d;
  cout<<(m-d)/n<<endl
    
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: expected ';' before '}' token
    7 |   cout<<(m-d)/n<<endl
      |                      ^
      |                      ;
    8 | 
    9 | }
      | ~
Language: C++

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

int main(){
  ll n,m,d;
  cin >> n >> m >> d;
  if(n<=2*d){
    cout << (ld)2*(n-d)*(m-1)/(n*n) << "\n";
    return 0;}
  if(d==0){cout << (ld)(m-1)/n << "\n";return 0;}
  cout(10)<<(ld)2*(n-d)*(m-1)/(n*n)<<endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:7: error: no match for call to '(std::ostream {aka std::basic_ostream<char>}) (int)'
   16 |   cout(10)<<(ld)2*(n-d)*(m-1)/(n*n)<<endl;
      |   ~~~~^~~~
Language: C++

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

int main(){
  ll n,m,d;
  cin >> n >> m >> d;
  if(n<=2*d){
    cout << (ld)2*(n-d)*(m-1)/(n*n) << "\n";
    return 0;}
  if(d==0){cout << (ld)(m-1)/n << "\n";return 0;}
  cout(10)<< (ld)2*(n-d)*(m-1)/(n*n) << "\n";
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:7: error: no match for call to '(std::ostream {aka std::basic_ostream<char>}) (int)'
   16 |   cout(10)<< (ld)2*(n-d)*(m-1)/(n*n) << "\n";
      |   ~~~~^~~~
Language: C++

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

int main(){
  ll n,m,d;
  cin >> n >> m >> d;
  if(n<=2*d){
    cout << (ld)2*(n-d)*(m-1)/(n*n) << "\n";
    return 0;}
  if(d==0){cout << (ld)(m-1)/n << "\n";return 0;}
  cout(10) << (ld)2*(n-d)*(m-1)/(n*n) << "\n";
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:7: error: no match for call to '(std::ostream {aka std::basic_ostream<char>}) (int)'
   16 |   cout(10) << (ld)2*(n-d)*(m-1)/(n*n) << "\n";
      |   ~~~~^~~~
Language: C++

#include <iostream>
using namespace std;

int main(){
  	double a, b, c;
  	cin >> a >> b >> c;
  	cout << fixed << setprecision(10) << (b - c) / a << endl;
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:26: error: 'setprecision' was not declared in this scope
    7 |         cout << fixed << setprecision(10) << (b - c) / a << endl;
      |                          ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include <iostream>
  +++ |+#include <iomanip>
    2 | using namespace std;
Language: C++

#include <iostream>
using namespace std;

int main(){
  	double a, b, c;
  	a >> b >> c;
  	cout << fixed << setprecision(10) << (b - c) / a << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:11: error: invalid operands of types 'double' and 'double' to binary 'operator>>'
    6 |         a >> b >> c;
      |         ~ ^~ ~
      |         |    |
      |         |    double
      |         double
a.cc:7:26: error: 'setprecision' was not declared in this scope
    7 |         cout << fixed << setprecision(10) << (b - c) / a << endl;
      |                          ^~~~~~~~~~~~
a.cc:2:1: note: 'std::setprecision' is defined in header '<iomanip>'; this is probably fixable by adding '#include <iomanip>'
    1 | #include <iostream>
  +++ |+#include <iomanip>
    2 | using namespace std;
Language: C++

#include<bits/stdc++.h>
using namespace std;
#define rep(i,j,n) for(int i=(int)(j);i<(int)(n);i++)
#define REP(i,j,n) for(int i=(int)(j);i<=(int)(n);i++)
#define MOD 1000000007
#define int long long
#define ALL(a) (a).begin(),(a).end()
#define vi vector<int>
#define vii vector<vi>
#define pii pair<int,int>
#define priq priority_queue<int>
#define disup(A,key) distance(A.begin(),upper_bound(ALL(A),(int)(key)))
#define dislow(A,key) distance(A.begin(),lower_bound(ALL(A),(int)(key)))
#define tii tuple<int,int,int>
#define Priq priority_queue<int,vi,greater<int>>
#define pb push_back
#define mp make_pair
#define INF (1ll<<60)
signed main(){
  int N,M,D; cin>>>N>>M>>D;
  double X=(N-D)*2/N/N;
  if(D==0) X=1.0/N;
  printf("%.10lf\n",X*(M-1));
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:20:19: error: expected primary-expression before '>' token
   20 |   int N,M,D; cin>>>N>>M>>D;
      |                   ^
Language: C++

#include <bits/stdc++.h>
#define pt(sth) cout << sth << "\n"
#define chmax(a, b) {if(a<b) a=b;}
#define chmin(a, b) {if(a>b) a=b;}
#define moC(a, s, b) (a)=((a)s(b)+MOD)%MOD
using namespace std;
typedef long long ll;
typedef pair<ll, ll> P;
static const ll INF=1e18;
static const ll MAX=101010;
static const ll MOD=1e9+7;
static const ll LOGN=55;



int main(void) {
  double N, M, d;
  cin >> N >> M >> d;
  double ans;
  if(d)
    ans=2*(N-d)/N/N*(M-1);
  else
    ans=1/N*(M-1);
  
  printf("%.9f\n", ans));
}





Compiler output:
a.cc: In function 'int main()':
a.cc:25:24: error: expected ';' before ')' token
   25 |   printf("%.9f\n", ans));
      |                        ^
      |                        ;