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

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

void dfs(int n, string acc = "a") {
  if (acc.size() == n) {
    cout << acc << endl;
    return;
  }
  for (int i = 0; i <= (acc.back() - 'a') + 1; ++i)
    dfs(n, acc + char('a' + i));
}

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

  dfs(n);
}

Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include <bits/stdc++.h>
      | ^~~~~~~
a.cc:4:17: error: 'string' has not been declared
    4 | void dfs(int n, string acc = "a") {
      |                 ^~~~~~
a.cc:4:33: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
    4 | void dfs(int n, string acc = "a") {
      |                                 ^
      |                                 |
      |                                 const char*
a.cc: In function 'void dfs(int, int)':
a.cc:5:11: error: request for member 'size' in 'acc', which is of non-class type 'int'
    5 |   if (acc.size() == n) {
      |           ^~~~
a.cc:6:5: error: 'cout' was not declared in this scope
    6 |     cout << acc << endl;
      |     ^~~~
a.cc:6:20: error: 'endl' was not declared in this scope
    6 |     cout << acc << endl;
      |                    ^~~~
a.cc:9:29: error: request for member 'back' in 'acc', which is of non-class type 'int'
    9 |   for (int i = 0; i <= (acc.back() - 'a') + 1; ++i)
      |                             ^~~~
a.cc: In function 'int main()':
a.cc:15:3: error: 'cin' was not declared in this scope
   15 |   cin >> n;
      |   ^~~
a.cc:17:6: error: invalid conversion from 'const char*' to 'int' [-fpermissive]
   17 |   dfs(n);
      |   ~~~^~~
      |      |
      |      const char*
Language: C++

#include <bits/stdc++.h>

using namespace std;

const long long INF = 1e7 + 1;
const long long MOD = 1000000007;
const long double PI = 3.14159265;

#define FOR(i,r,n) for(ll i = (ll)(r); i < (ll)(n); ++i)
#define RFOR(i,n,r) for(ll i = (ll)(n-1); i >= r; --i)
#define REP(i,n) FOR(i,0,n)
#define RREP(i,n) RFOR(i,n,0)
#define ALL(x) x.begin(),x.end()
#define CALL(x) x.cbegin(),x.cend()
#define RALL(x) x.rbegin(),x.rend()
#define CRALL(x) x.crbegin(),x.crend()

#define cout cout << setprecision(12)

using ll = long long int;
using ull = unsigned long long int;
using ld = long double;
using vi = vector<ll>;
using vvi = vector<vi>;
using vp = vector<pair<ll, ll>>;
using vs = vector<string>;
using vc = vector<char>;
using lst = list<ll>;
using pq = priority_queue<ll>;

template < typename T >
inline void dbg(T a) { cout << a << ' '; }

ll n, m, k, ans = 0, sum = 0, cnt = 0;
string s;
char c;

/*--------------------template--------------------*/

void dfs(string s, char mx) {
	if (s.length() == n) {
    	cout << s << endl;
    } else {
    	for(char i = 'a'; i <= mx; ++i) {
        	dfs(s+i, (i==mx?mx+1:mx));
        }
    }
}

int main() {
    cin >> n;
	dfs();
}


Compiler output:
a.cc: In function 'int main()':
a.cc:52:12: error: too few arguments to function 'void dfs(std::string, char)'
   52 |         dfs();
      |         ~~~^~
a.cc:40:6: note: declared here
   40 | void dfs(string s, char mx) {
      |      ^~~
Language: C++

#include<bits/stdc++.h>
#define _GLIBCXX_DEBUG
//repマクロ定義
#define rep(i,n) for (int i = 0; i < (int)(n); i++)
//allマクロ定義
#define all(v) v.begin(),v.end()
using namespace std;

//global variable
int N;

//Recursive function
void dfs(string s,char mx){
  if(s.length()==N){
    printf("%s\n",s.c_str())
  }else{
    for(char c='a';c<=mx;c++){
      dfs(s+c,(c==mx) ? (char)(mx+1):mx);
    }
  }
}
int main()
{
  cin >> N;
  dfs("",'a');
}

Compiler output:
a.cc: In function 'void dfs(std::string, char)':
a.cc:15:29: error: expected ';' before '}' token
   15 |     printf("%s\n",s.c_str())
      |                             ^
      |                             ;
   16 |   }else{
      |   ~
Language: C++

#include <stdio.h>
#include <string.h>
 
#define MAX 10
int num;
 
 
void make_str(char a[MAX],char b){
  char x;
  if(a[num-1]!=''){
    printf("%s",a);
  }else{
    for(x='a';x<b;x++){
      make_str(a+x,x);
    }
    make_str(a+x,'a');
  
}
 
int main(){
  scanf("%d",&num); //文字列数格納
  make_str("",'a');
  return 0;
}

Compiler output:
a.cc:10:16: error: empty character constant
   10 |   if(a[num-1]!=''){
      |                ^~
a.cc: In function 'void make_str(char*, char)':
a.cc:20:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   20 | int main(){
      |         ^~
a.cc:20:9: note: remove parentheses to default-initialize a variable
   20 | int main(){
      |         ^~
      |         --
a.cc:20:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:20:11: error: a function-definition is not allowed here before '{' token
   20 | int main(){
      |           ^
a.cc:24:2: error: expected '}' at end of input
   24 | }
      |  ^
a.cc:8:34: note: to match this '{'
    8 | void make_str(char a[MAX],char b){
      |                                  ^
Language: C++

#include <stdio.h>
#include <string.h>
 
#define MAX 10
int num;
 
 
void make_str(char a[MAX],char b){
  char x;
  if(a.length()==num){
    printf("%s",a);
  }else{
    for(x='a';x<b;x++){
      make_str(a+x,x);
    }
    make_str(a+x,'a');
  
}
 
int main(){
  scanf("%d",&num); //文字列数格納
  make_str("",'a');
  return 0;
}

Compiler output:
a.cc: In function 'void make_str(char*, char)':
a.cc:10:8: error: request for member 'length' in 'a', which is of non-class type 'char*'
   10 |   if(a.length()==num){
      |        ^~~~~~
a.cc:20:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   20 | int main(){
      |         ^~
a.cc:20:9: note: remove parentheses to default-initialize a variable
   20 | int main(){
      |         ^~
      |         --
a.cc:20:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:20:11: error: a function-definition is not allowed here before '{' token
   20 | int main(){
      |           ^
a.cc:24:2: error: expected '}' at end of input
   24 | }
      |  ^
a.cc:8:34: note: to match this '{'
    8 | void make_str(char a[MAX],char b){
      |                                  ^
Language: C++

#include <stdio.h>
#include <string.h>
 
#defien MAX 10
int num;

 
void make_str(char a[MAX],char b){
  char x;
  if(a.length()==num){
    printf("%s",a);
  }else{
    for(x='a';x<b;x++){
      make_str(a+x,x);
    }
    make_str(a+x,'a');
  
}
 
int main(){
  scanf("%d",&num); //文字列数格納
  make_str("",'a');
  return 0;
}

Compiler output:
a.cc:4:2: error: invalid preprocessing directive #defien; did you mean #define?
    4 | #defien MAX 10
      |  ^~~~~~
      |  define
a.cc:8:22: error: 'MAX' was not declared in this scope
    8 | void make_str(char a[MAX],char b){
      |                      ^~~
a.cc:8:26: error: expected ')' before ',' token
    8 | void make_str(char a[MAX],char b){
      |              ~           ^
      |                          )
a.cc:8:27: error: expected unqualified-id before 'char'
    8 | void make_str(char a[MAX],char b){
      |                           ^~~~
Language: C++

#include <stdio.h>
#include <string.h>
 
int num;
 
void make_str(char a[num],char b){
  char x;
  if(a.length()==num){
    printf("%s",a);
  }else{
    for(x='a';x<b;x++){
      make_str(a+x,x);
    }
    make_str(a+x,'a');
  
}
 
int main(){
  scanf("%d",&num); //文字列数格納
  make_str("",'a');
  return 0;
}

Compiler output:
a.cc:6:22: error: size of array 'a' is not an integral constant-expression
    6 | void make_str(char a[num],char b){
      |                      ^~~
a.cc: In function 'void make_str(char*, char)':
a.cc:8:8: error: request for member 'length' in 'a', which is of non-class type 'char*'
    8 |   if(a.length()==num){
      |        ^~~~~~
a.cc:18:9: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   18 | int main(){
      |         ^~
a.cc:18:9: note: remove parentheses to default-initialize a variable
   18 | int main(){
      |         ^~
      |         --
a.cc:18:9: note: or replace parentheses with braces to value-initialize a variable
a.cc:18:11: error: a function-definition is not allowed here before '{' token
   18 | int main(){
      |           ^
a.cc:22:2: error: expected '}' at end of input
   22 | }
      |  ^
a.cc:6:34: note: to match this '{'
    6 | void make_str(char a[num],char b){
      |                                  ^
Language: C++

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

int num;

void make_str(string a,char b){
  char x;
  if(a.length()==num){
    printf("%s",a);
  }else{
    for(x='a';x<b;x++){
      make_str(a+x,x);
    }
    make_str(a+x,'a');
  
}

int main(){
  scanf("%d",&num); //文字列数格納
  make_str("",'a');
  return 0;
}
  

Compiler output:
a.cc:6:6: error: variable or field 'make_str' declared void
    6 | void make_str(string a,char b){
      |      ^~~~~~~~
a.cc:6:15: error: 'string' was not declared in this scope; did you mean 'stdin'?
    6 | void make_str(string a,char b){
      |               ^~~~~~
      |               stdin
a.cc:6:24: error: expected primary-expression before 'char'
    6 | void make_str(string a,char b){
      |                        ^~~~
Language: C++

#include <iostream>
#include <algorithm>
#include <string>
#include <vector>
#include <set>
#include <cmath>
#include <stdio.h>
#include <list>
#include <numeric>
#include <stack>
#include <queue>
#include <tuple>
#include <bitset>
#include <map>
#include <math.h>
//　ceil(a/b)   (a + (b - 1))/ b
using namespace std;
#define rep(i,n) for(int i = 0; i < (n); i++)
typedef long long ll;
typedef pair<int,int> P;
const int inf=1000000007;
const ll mod=1000000007;
const double PI=3.14159265358979323846;
int dx[] = {1,-1,0,0};
int dy[] = {0,0,1,-1};

ll gcd(ll a, ll b){
  if (b==0) return a;
  else return gcd(b,a%b);
}o

int cans(bool f){
  if(f) cout << "Yes" << endl;
  else cout << "No" << endl;
  return 0;
}

int N;

void dfs(string s, char mx){
  if(s.size() == N) cout << s << endl;
  else{
    for(char c='a';c<=mx;c++){
      if(c==mx) dfs(s+c,mx+1);
      else dfs(s+c,mx);
    }
  }
}



int main(){
  cin >> N;
  dfs("",'a');
  return 0;
}



Compiler output:
a.cc:30:2: error: 'o' does not name a type
   30 | }o
      |  ^
Language: C++

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

//int main(){
    //A
    /*
    vector<int> a={1, 1, 1, 2, 1, 2, 1, 5, 2, 2, 1, 5, 1, 2, 1, 14, 1, 5, 1, 5, 2, 2, 1, 15, 2, 2, 5, 4, 1, 4, 1, 51};
    int K;
    cin>>K;
    cout<<a[K-1]<<endl;
    */
   //B
   /*
   long long H,W;
   cin>>H>>W;
   if(H==1||W==1) cout<<1<<endl;
   else cout<<(H*W+1)/2<<endl;
   */
   //C
   /*
   long long a,b,c; //int型は2*10^9くらいの値まで
   cin>>a>>b>>c;
   long long d = c-a-b;
   if(d>0&&d*d>4*a*b) cout<<"Yes"<<endl;
   else cout<<"No"<<endl;
   */
   //D dfsのリターンについて・・・1度のdfs関数への代入で複数のreturnが起こる？
   int n;
   void dfs(string s,char end){
       if(s.size()==n){
           cout<<s<<endl;
           return ;
       }
       for(char i='a';i<=end;i++){
           char nxt = end;
           if(i==end) nxt++;
           dfs(s+i,nxt);
       }
   }
  // }
//return 0;
//}
    int main(){
        cin>>n;
        dfs('a','a');
        return 0;
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:46:13: error: could not convert ''a'' from 'char' to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   46 |         dfs('a','a');
      |             ^~~
      |             |
      |             char
Language: C++

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

//int main(){
    //A
    /*
    vector<int> a={1, 1, 1, 2, 1, 2, 1, 5, 2, 2, 1, 5, 1, 2, 1, 14, 1, 5, 1, 5, 2, 2, 1, 15, 2, 2, 5, 4, 1, 4, 1, 51};
    int K;
    cin>>K;
    cout<<a[K-1]<<endl;
    */
   //B
   /*
   long long H,W;
   cin>>H>>W;
   if(H==1||W==1) cout<<1<<endl;
   else cout<<(H*W+1)/2<<endl;
   */
   //C
   /*
   long long a,b,c; //int型は2*10^9くらいの値まで
   cin>>a>>b>>c;
   long long d = c-a-b;
   if(d>0&&d*d>4*a*b) cout<<"Yes"<<endl;
   else cout<<"No"<<endl;
   */
   //D dfsのリターンについて・・・1度のdfs関数への代入で複数のreturnが起こる？
   int n;
   void dfs(string s,char end){
       if(s.size()==n){
           cout<<s<<endl;
           return ;
       }
       for(char i='a';i<=end;i++){
           char nxt = end;
           if(i==end) nxt++;
           dfs(s+i,nxt);
       }
  // }
//return 0;
//}
    int main(){
        cin>>n;
        dfs(" ",'a');
        return 0;
    }

Compiler output:
a.cc: In function 'void dfs(std::string, char)':
a.cc:43:13: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   43 |     int main(){
      |             ^~
a.cc:43:13: note: remove parentheses to default-initialize a variable
   43 |     int main(){
      |             ^~
      |             --
a.cc:43:13: note: or replace parentheses with braces to value-initialize a variable
a.cc:43:15: error: a function-definition is not allowed here before '{' token
   43 |     int main(){
      |               ^
a.cc:47:6: error: expected '}' at end of input
   47 |     }
      |      ^
a.cc:30:31: note: to match this '{'
   30 |    void dfs(string s,char end){
      |                               ^
Language: C++

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

//int main(){
    //A
    /*
    vector<int> a={1, 1, 1, 2, 1, 2, 1, 5, 2, 2, 1, 5, 1, 2, 1, 14, 1, 5, 1, 5, 2, 2, 1, 15, 2, 2, 5, 4, 1, 4, 1, 51};
    int K;
    cin>>K;
    cout<<a[K-1]<<endl;
    */
   //B
   /*
   long long H,W;
   cin>>H>>W;
   if(H==1||W==1) cout<<1<<endl;
   else cout<<(H*W+1)/2<<endl;
   */
   //C
   long long a,b,c; //int型は2*10^9くらいの値まで
   cin>>a>>b>>c;
   long long d = c-a-b;
   if(d>0&&d*d>4*a*b) cout<<"Yes"<<endl;
   else cout<<"No"<<endl;
   //D dfsのリターンについて・・・1度のdfs関数への代入で複数のreturnが起こる？
   int n;
   void dfs(string s,char end){
       if(s.size()==n){
           cout<<s<<endl;
           return ;
       }
       for(char i='a';i<=end;i++){
           char nxt = end;
           if(i==end) nxt++;
           dfs(s+i,nxt);
       }
  // }
//return 0;
//}
    int main(){
        cin>>n;
        dfs(" ",'a');
        return 0;
    }

Compiler output:
a.cc:22:4: error: 'cin' does not name a type
   22 |    cin>>a>>b>>c;
      |    ^~~
a.cc:24:4: error: expected unqualified-id before 'if'
   24 |    if(d>0&&d*d>4*a*b) cout<<"Yes"<<endl;
      |    ^~
a.cc:25:4: error: expected unqualified-id before 'else'
   25 |    else cout<<"No"<<endl;
      |    ^~~~
a.cc: In function 'void dfs(std::string, char)':
a.cc:41:13: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   41 |     int main(){
      |             ^~
a.cc:41:13: note: remove parentheses to default-initialize a variable
   41 |     int main(){
      |             ^~
      |             --
a.cc:41:13: note: or replace parentheses with braces to value-initialize a variable
a.cc:41:15: error: a function-definition is not allowed here before '{' token
   41 |     int main(){
      |               ^
a.cc:45:6: error: expected '}' at end of input
   45 |     }
      |      ^
a.cc:28:31: note: to match this '{'
   28 |    void dfs(string s,char end){
      |                               ^
Language: C++

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

int N;

void dfs(string s, char mx){
    if(s.length() == N){
        printf("%s\n", s.c_str());
    }
    else {
        for(char c=’a’;c<=mx;c++){
            dfs(s + c, ((c == mx) ? (char)(mx + 1) : mx));
        }
    }
}

int main(void){
    cin >> N;
    dfs("", ’a’);
    return 0;
}


Compiler output:
a.cc:11:20: error: extended character ’ is not valid in an identifier
   11 |         for(char c=’a’;c<=mx;c++){
      |                    ^
a.cc:11:20: error: extended character ’ is not valid in an identifier
a.cc:19:13: error: extended character ’ is not valid in an identifier
   19 |     dfs("", ’a’);
      |             ^
a.cc:19:13: error: extended character ’ is not valid in an identifier
a.cc: In function 'void dfs(std::string, char)':
a.cc:11:20: error: '\U00002019a\U00002019' was not declared in this scope
   11 |         for(char c=’a’;c<=mx;c++){
      |                    ^~~
a.cc: In function 'int main()':
a.cc:19:13: error: '\U00002019a\U00002019' was not declared in this scope
   19 |     dfs("", ’a’);
      |             ^~~
Language: C++

#include <bits/stdc++.h>
#define rep(i,n) for(ll i=0;i<(n);++i)
#define all(a) (a).begin(),(a).end()
#define dunk(a) cout << (a) << endl
#define rall(a) (a).rbegin(),(a).rend()
const int INF = 2e9;
using namespace std;
using Graph = vector<vector<int>>;
typedef pair<int,int> P;
typedef long long ll;

int n;
void dfs(string s, char mx){
    if(s.size == n){
        dunk(s);
        return;
    }
    for(char x = 'a'; x <= mx; x++){
        string t = s;
        t += x;
        dfs(t, max(x, mx));
    }
}

int main(){
    cin >> n;
    dfs("", 'a'-1);
}

    

Compiler output:
a.cc: In function 'void dfs(std::string, char)':
a.cc:14:10: error: invalid use of member function 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size() const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (did you forget the '()' ?)
   14 |     if(s.size == n){
      |        ~~^~~~
      |              ()
Language: C++

#include <iostream>
#include <string>

using namespace std;

int N;

void dfs(string s, char mx){
  if(s.length() == N){
    printf("%s\n", s.c_str());
  } else {
    for(char c=’a’;c<=mx;c++){
 	  dfs(s + c, ((c == mx) ? (char)(mx + 1) : mx));
	}
	}
}

int main(void){
 cin >> N;
 dfs("", ’a’);
 return 0;
}

Compiler output:
a.cc:12:16: error: extended character ’ is not valid in an identifier
   12 |     for(char c=’a’;c<=mx;c++){
      |                ^
a.cc:12:16: error: extended character ’ is not valid in an identifier
a.cc:20:10: error: extended character ’ is not valid in an identifier
   20 |  dfs("", ’a’);
      |          ^
a.cc:20:10: error: extended character ’ is not valid in an identifier
a.cc: In function 'void dfs(std::string, char)':
a.cc:12:16: error: '\U00002019a\U00002019' was not declared in this scope
   12 |     for(char c=’a’;c<=mx;c++){
      |                ^~~
a.cc: In function 'int main()':
a.cc:20:10: error: '\U00002019a\U00002019' was not declared in this scope
   20 |  dfs("", ’a’);
      |          ^~~
Language: C++

#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>
#include <set>

using namespace std;

int n;
set<string> ans;

void dfs(string s, maxi c) {
	if (s.size() == n) {
		ans.insert(s);
		return;
	}

	for (char c = 'a'; c <= maxi + 1; c++) {
		dfs(s + c, maxi + 1);
	}
}

int main() {
	cin >> n;

	dfs("a", 'a');
	for (auto s: ans) {
		cout << s << endl;
	}
	return 0;
}


Compiler output:
a.cc:14:20: error: 'maxi' has not been declared
   14 | void dfs(string s, maxi c) {
      |                    ^~~~
a.cc: In function 'void dfs(std::string, int)':
a.cc:20:33: error: 'maxi' was not declared in this scope
   20 |         for (char c = 'a'; c <= maxi + 1; c++) {
      |                                 ^~~~
Language: Java

import java.util.*;
public class Main{
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int i,j,k;
		int point = N-1;
		String w,w2;
		StringBuilder sb = new StringBuilder();
		for(i = 0;i < N;i++){
			sb.append("a");
		}
		w = sb.toString();
		System.out.println(w);
		for(i = 0;i < N-1;i++){
			w2 = w.substring(0,point);
			w2 += "b";
			Addabc(N,w2);
			point--;
		}
	}
	public static void Addabc(int max,String w2){
		char buf = 'a';
		if(w2.length() == max){
			System.out.println(w2);
		}else{
			char end = w2.charAt(w2.length() - 1);
			int i = 0;
			w2 += "a";
			while(w2.contains(buf)){
				w2 = w2.substring(0,(w2.length()) - 1);
				buf += i;
				String buf2 = String.valueOf(buf);
				w2 += buf2;
				Addabc(max,w2);
				i = 1;
			}
		}
	}
}


Compiler output:
Main.java:30: error: incompatible types: char cannot be converted to CharSequence
			while(w2.contains(buf)){
			                  ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define reps(i,s,n) for(int i = s; i < n; i++)
#define rep(i,n) reps(i,0,n)
#define Rreps(i,n,e) for(int i = n - 1; i >= e; --i)
#define Rrep(i,n) Rreps(i,n,0)
#define ALL(a) a.begin(), a.end()
#define fi first
#define se second
#define endl "\n"
typedef long long ll;
typedef vector<ll> vec;
typedef vector<vec> mat;
#define traceV(v) for(auto x:v)cout<<x<<" ";cout<<endl
#define traceM(mp) for(auto x:mp)cout<<x.first<<" "<<x.second<<endl

//const ll MOD = 998244353;
const ll MOD = (1e+9) + 7;
const ll INF = 2e+9 + 10;
typedef pair<ll, ll> P;

//解答の文字列の範囲は，0000~0123であり，その範囲の文字列の型を判定して，新規の型であれば，保持し，最後に列挙する．

class Radix {
private:
    const char* s;
    int a[128];
public:
    Radix(const char* s = "0123456789ABCDEF") : s(s) {
      int i;
      for(i = 0; s[i]; ++i)
        a[(int)s[i]] = i;
    }
    std::string to(long long p, int q) {
      int i;
      if(!p)
        return "0";
      char t[64] = { };
      for(i = 62; p; --i) {
        t[i] = s[p % q];
        p /= q;
      }
      return std::string(t + i + 1);
    }
    std::string to(const std::string& t, int p, int q) {
      return to(to(t, p), q);
    }
    long long to(const std::string& t, int p) {
      int i;
      long long sm = a[(int)t[0]];
      for(i = 1; i < (int)t.length(); ++i)
        sm = sm * p + a[(int)t[i]];
      return sm;
    }
};

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

  int N;
  cin >> N;

  if(N==1){cout<<'a'<<endl;return 0}

  vector<int> v1(N), v2(N);
  rep(i, N) v2[i]=i;

  vector<vector<bool>> mt;

  for(int i=0; v1!=v2; i++) {
    // 10進数iをN進数numに変換
    Radix r;
    string s = r.to(i, N);
    istringstream ss = istringstream(s);
    int num = atoi(s.c_str());
    ss >> num;

    // numを配列に格納
    rep(i,N)v1[i]=0;  // 初期化
    for(int j=0; num;) {
      v1[j] = num%10;
      num/=10;
      j++;
    }
    reverse(ALL(v1));

    // v1の型を調べる
    vector<bool> v3;
    for(int j=0; j<N; j++) {
      for(int k=j+1; k<N; k++) {
        v3.push_back(v1[j]==v1[k]);
      }
    }

    // v1の型が新規のものであればmtに格納して，v1に対応するアルファベット列を出力
    if(find(ALL(mt), v3) == mt.end()) {   // 存在していないならば
      mt.push_back(v3);

      for(int j=0; j<N; j++) {
        cout << (char)(v1[j]+'a');
      }
      cout << endl;
    }
  }

  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:64:36: error: expected ';' before '}' token
   64 |   if(N==1){cout<<'a'<<endl;return 0}
      |                                    ^
      |                                    ;
Language: C++

def dfs(s,x):
    if len(s) == n:
        print(s)
    else:
        for c in range(ord('a'),ord(x) + 1):
            dfs(s + chr(c),chr(ord(x) + 1) if chr(c) == x  else x)

n = int(input())
dfs("",'a')

Compiler output:
a.cc:1:1: error: 'def' does not name a type
    1 | def dfs(s,x):
      | ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int n;
void dfs(string s, char ch) {
  if(s.length() == n) {
    cout << s << endl;
  } else {
    for(char i = 'a'; i <= ch; ++ i){
      dfs(s + i, i);
    }
  }
}
int main() {
  cin >> n;
  dfs('','a');
}

Compiler output:
a.cc:15:7: error: empty character constant
   15 |   dfs('','a');
      |       ^~
a.cc: In function 'int main()':
a.cc:15:7: error: could not convert ''\000'' from 'char' to 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   15 |   dfs('','a');
      |       ^~
      |       |
      |       char
Language: C++

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

int n;

void dfs(string s) {
  char end = s.back();
  
  if(s.length() >= n){
    cout << s << endl;
  } else {
    for(char c = 'a'; c <= end+1; ++c) {
      dfs(s + c);
    }
  }
  
}

Compiler output:
/usr/bin/ld: /usr/lib/gcc/x86_64-linux-gnu/14/../../../x86_64-linux-gnu/Scrt1.o: in function `_start':
(.text+0x17): undefined reference to `main'
collect2: error: ld returned 1 exit status
Language: C++

 #include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cctype>
#include <cassert>
#include <climits>
#include <string>
#include <bitset>
#include <cfloat>
 #include <iostream>
#include <cstdio>
#include <algorithm>
#include <cmath>
#include <vector>
#include <list>
#include <set>
#include <map>
#include <queue>
#include <stack>
#include <cctype>
#include <cassert>
#include <climits>
#include <string>
#include <bitset>
#include <cfloat>
#include <unordered_set>
#include <iomanip>
using namespace std;
typedef long double ld;
typedef long long int ll;
typedef unsigned long long int ull;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<char> vc;
typedef vector<bool> vb;
typedef vector<double> vd;
typedef vector<string> vs;
typedef vector<ll> vll;
typedef vector<pair<int,int> > vpii;
typedef vector<vector<int> > vvi;
typedef vector<vector<char> > vvc;
typedef vector<vector<string> > vvs;
typedef vector<vector<ll> > vvll;
#define rep(i,n) for(int i = 0; i < (n); ++i)
#define rrep(i,n) for(int i = 1; i <= (n); ++i)
#define irep(it, stl) for(auto it = stl.begin(); it != stl.end(); it++)
#define drep(i,n) for(int i = (n) - 1; i >= 0; --i)
#define fin(ans) cout << (ans) << endl
#define mp(p,q) make_pair(p, q)
#define pb(n) push_back(n)
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define Sort(a) sort(a.begin(), a.end())
#define Rort(a) sort(a.rbegin(), a.rend())
#define MATHPI acos(-1)
int dx8[8] = {1, 0, -1, 0, 1, -1, -1, 1};
int dy8[8] = {0, 1, 0, -1, 1, 1, -1, -1};
int dx4[4] = {1, 0, -1, 0};
int dy4[4] = {0, 1, 0, -1};
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;}
template<typename A, size_t N, typename T> void Fill(A (&array)[N], const T &val){ fill((T*)array, (T*)(array+N), val); }
struct io{io(){ios::sync_with_stdio(false);cin.tie(0);}};
const int INF = INT_MAX;
const ll LLINF = 1LL<<60;
const ll MOD = 1000000007;
const double EPS = 1e-9;

//問題文が複雑な時は具体例を出して、小さい方から考えていく
//形だけが同じなら良くて、a~前の文字列で使った一番大きい文字+1が次の文字列で使える
//あとは形が同じでその中の辞書順最強をdfsで作っていく

int N;
string s = "";

void dfs(int v){
    //N文字になるまで
    if(v == N){
        fin(s);
    }
    
    
    //現在使える一番大きい文字
    char currentBigAlpha = 'a';
    
    //sからbiggestを探す
    while(s.find(currentBigAlpha) != string::npos){
        //aから初めてその文字列の一番大きいやつを探す
        currentBigAlpha++
    }
    //次で+1してるので--しておく
    currentBigAlpha--;

    for(char c='a';c<=currentBigAlpha+1;c++){
        s += c;
        //全列挙のときdfsを使うのはここでN=3だったら最初にaaaまでいってもどったときにsをpopして次にaabをして
        //その次はab→aba→abb→abcとやるから、popが便利！
        dfs(s.size());
        s.pop_back();
    }

}
int main(){
      cin >> N;
      dfs(0);
      
}

Compiler output:
a.cc: In function 'void dfs(int)':
a.cc:96:26: error: expected ';' before '}' token
   96 |         currentBigAlpha++
      |                          ^
      |                          ;
   97 |     }
      |     ~
Language: C++

#include <iostream>
#include <algorithm>
#include <iomanip>
#include <string>
#include <vector>
#include <math.h>
#include <queue>
#include <deque>
#include <map>
const int MOD = 1e9+7;
typedef long long ll;
using namespace std;

char get_max(string t){
	int temp = 0;
	string s = "abcdefghij";
	for (int i = 0; i < t.length(); i++){
		for (int j = 0; j < s.length(); j++){
			if (t[i] == s[j]){
				temp = max(temp, j);
				break;
			}
		}
	}
	return s[temp];
}

int main(){
	int n;
	cin >> n;
	string s = "abcdefghijklmnopqrstuvwxyz";
	vector<string> num[11];
	num[1].push_back("a");
	for (int i = 2; i <= n; i++){
		for (int k = 0; k < num[i-1].size(); k++){
			for (int j = 0; j < i; j++){
				if (get_max(num[i-1][k]) + 2 == s[j]) break;
				num[i].push_back(num[i-1][k]+s[j]);
			}	
		}
	}
	for (int i = 0; i < num[n].size(); i+){
			cout << num[n][i] << endl;
	}
	return 0;
 }



Compiler output:
a.cc: In function 'int main()':
a.cc:42:46: error: expected primary-expression before ')' token
   42 |         for (int i = 0; i < num[n].size(); i+){
      |                                              ^
Language: C++

using namespace std;
typedef long long ll;

int N;
vector< string > sv;

void f( string a, int len, int m) {
//  cout << a << " " << len << " " << m << endl;
  REP(i,m+1) {
    string rs = a;
    rs += ('a' + i);
    if (len+1 < N ) {
      f(rs, len+1, max(m,i+1));
    } else {
      sv.push_back(rs);
    }
  }
  return;
}

int main(){
  cin >> N;
  string s;
  s = "";
  f( s, 0, 0);
  sort(sv.begin(), sv.end());
  for ( auto a : sv ) 
    cout << a << endl;
}


Compiler output:
a.cc:5:1: error: 'vector' does not name a type
    5 | vector< string > sv;
      | ^~~~~~
a.cc:7:6: error: variable or field 'f' declared void
    7 | void f( string a, int len, int m) {
      |      ^
a.cc:7:9: error: 'string' was not declared in this scope
    7 | void f( string a, int len, int m) {
      |         ^~~~~~
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:7:19: error: expected primary-expression before 'int'
    7 | void f( string a, int len, int m) {
      |                   ^~~
a.cc:7:28: error: expected primary-expression before 'int'
    7 | void f( string a, int len, int m) {
      |                            ^~~
a.cc: In function 'int main()':
a.cc:22:3: error: 'cin' was not declared in this scope
   22 |   cin >> N;
      |   ^~~
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:23:3: error: 'string' was not declared in this scope
   23 |   string s;
      |   ^~~~~~
a.cc:23:3: note: 'std::string' is defined in header '<string>'; this is probably fixable by adding '#include <string>'
a.cc:24:3: error: 's' was not declared in this scope
   24 |   s = "";
      |   ^
a.cc:25:3: error: 'f' was not declared in this scope
   25 |   f( s, 0, 0);
      |   ^
a.cc:26:8: error: 'sv' was not declared in this scope
   26 |   sort(sv.begin(), sv.end());
      |        ^~
a.cc:26:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   26 |   sort(sv.begin(), sv.end());
      |   ^~~~
      |   short
a.cc:28:5: error: 'cout' was not declared in this scope
   28 |     cout << a << endl;
      |     ^~~~
a.cc:28:5: note: 'std::cout' is defined in header '<iostream>'; this is probably fixable by adding '#include <iostream>'
a.cc:28:18: error: 'endl' was not declared in this scope
   28 |     cout << a << 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: Java

#include <iostream>
using namespace std;

int N;
void dfs(string s,char mx){
    if(s.length()==N){
        printf("%s\n",s.c_str());
    }else{
        for(char c='a';c<=mx;c++){
            dfs(s+c,((c==mx)?(char)(mx+1):mx));
        }
    }
}

int main(void){
    cin >> N;
    dfs("",'a');
    return 0;
    
}


Compiler output:
Main.java:1: error: illegal character: '#'
#include <iostream>
^
Main.java:1: error: class, interface, enum, or record expected
#include <iostream>
         ^
Main.java:4: error: unnamed classes are a preview feature and are disabled by default.
int N;
^
  (use --enable-preview to enable unnamed classes)
Main.java:16: error: not a statement
    cin >> N;
        ^
Main.java:15: error: <identifier> expected
int main(void){
             ^
5 errors
Language: C++

#include <iostream>
using namespace std;

#define rep(i,n) for(int i=0;i<(int)n;++i)

int N;

void dfs(string &s, char &mx)
{
	if (s.size() == N) {
		cout << s << endl;
		return;
	}

	for (char c = 'a'; c <= mx + 1; ++c) {
		dfs(s + c, c > mx ? c : mx);
	}
}

int main()
{
	ios::sync_with_stdio(false);
	cin >> N;

	dfs("", 'a'-1);
}


Compiler output:
a.cc: In function 'void dfs(std::string&, char&)':
a.cc:16:23: error: cannot bind non-const lvalue reference of type 'std::string&' {aka 'std::__cxx11::basic_string<char>&'} to an rvalue of type 'std::__cxx11::basic_string<char>'
   16 |                 dfs(s + c, c > mx ? c : mx);
      |                     ~~^~~
a.cc:8:18: note:   initializing argument 1 of 'void dfs(std::string&, char&)'
    8 | void dfs(string &s, char &mx)
      |          ~~~~~~~~^
a.cc: In function 'int main()':
a.cc:25:13: error: cannot bind non-const lvalue reference of type 'std::string&' {aka 'std::__cxx11::basic_string<char>&'} to an rvalue of type 'std::string' {aka 'std::__cxx11::basic_string<char>'}
   25 |         dfs("", 'a'-1);
      |             ^~
In file included from /usr/include/c++/14/string:54,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41,
                 from a.cc:1:
/usr/include/c++/14/bits/basic_string.h:646:7: note:   after user-defined conversion: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::basic_string(const _CharT*, const _Alloc&) [with <template-parameter-2-1> = std::allocator<char>; _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
  646 |       basic_string(const _CharT* __s, const _Alloc& __a = _Alloc())
      |       ^~~~~~~~~~~~
a.cc:8:18: note:   initializing argument 1 of 'void dfs(std::string&, char&)'
    8 | void dfs(string &s, char &mx)
      |          ~~~~~~~~^
Language: C++

/**
 * code generated by JHelper
 * More info: https://github.com/AlexeyDmitriev/JHelper
 * @author
 */


#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <queue>
#include <map>
#include <set>
#include <functional>
#include <cmath>
#include <numeric>
#include <iterator>
#include <fstream>

#define SIZE 100005
#define MOD 1000000007

using namespace std;

class DStringEquivalence {
public:
  static void search(int n, vector<string> &vec) {
    if (n == 0)return;
    search(n + 1, vec);
  }

  static void solve(std::istream &cin, std::ostream &cout) {
    int n;
    cin >> n;
    vector<char> vec = {'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j'};
    vector<string> ans;
//    search(n, ans);
    stack<string> stack;
    stack.push("a");
    if (n == 1) {
      cout << stack.top() << endl;
      return;
    }
    while (!stack.empty()) {
      string now = stack.top();
      stack.pop();
      set<char> s;
      for (const auto &item : now) s.insert(item);
      int index = s.size();
      for (int k = 0; k < index + 1; ++k) {
        string tmp = now + vec[k];
        if (tmp.size() > n)continue;
        else if (tmp.size() == n) ans.emplace_back(tmp);
        stack.push(tmp);
      }
    }
    sort(ans.begin(), ans.end());
    for (const auto &item : ans) {
      cout << item << endl;
    }
  }
};


int main() {
    DStringEquivalence solver;
    std::istream& in(std::cin);
    std::ostream& out(std::cout);
    solver.solve(in, out);
    return 0;
}


Compiler output:
a.cc: In static member function 'static void DStringEquivalence::solve(std::istream&, std::ostream&)':
a.cc:39:5: error: 'stack' was not declared in this scope
   39 |     stack<string> stack;
      |     ^~~~~
a.cc:20:1: note: 'std::stack' is defined in header '<stack>'; this is probably fixable by adding '#include <stack>'
   19 | #include <fstream>
  +++ |+#include <stack>
   20 | 
a.cc:39:17: error: expected primary-expression before '>' token
   39 |     stack<string> stack;
      |                 ^
Language: C++

def dfs(s, maxc)
  return puts s if s.length == @n
  ('a'..maxc).each do |c|
    c == maxc ? dfs(s + c, maxc.next) : dfs(s + c, maxc)
  end
end

@n = gets.to_i
dfs('', 'a')

Compiler output:
a.cc:2:32: error: stray '@' in program
    2 |   return puts s if s.length == @n
      |                                ^
a.cc:8:1: error: stray '@' in program
    8 | @n = gets.to_i
      | ^
a.cc:9:5: error: empty character constant
    9 | dfs('', 'a')
      |     ^~
a.cc:1:1: error: 'def' does not name a type
    1 | def dfs(s, maxc)
      | ^~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
using i64 = int_fast64_t;
#define rep(i, N) for(int (i) = 0; (i) < (N); (i)++)
#define all(v) (v).begin(), (v).end()
#define eb emplace_back

int main(){
  int N;
  cin >> N;
  vector<string> ans;
  
  auto dfs = [&](auto&& dfs_, string S, char m) -> void {
    if(S.size() == N) {
      ans.emplace_back(S);
      return;
    }
    
    for(char c = 'a'; c <= m; c++){
      dfs_(dfs_, S + c, (c == m ? m+1 : m));
    }
    return;
  };
  
  dfs(dfs, "", "a");
  for(auto& c : ans){
    cout << c << endl;
  }
}


Compiler output:
a.cc: In function 'int main()':
a.cc:25:6: error: no match for call to '(main()::<lambda(auto:28&&, std::string, char)>) (main()::<lambda(auto:28&&, std::string, char)>&, const char [1], const char [2])'
   25 |   dfs(dfs, "", "a");
      |   ~~~^~~~~~~~~~~~~~
a.cc:13:14: note: candidate: 'template<class auto:28> main()::<lambda(auto:28&&, std::string, char)>'
   13 |   auto dfs = [&](auto&& dfs_, string S, char m) -> void {
      |              ^
a.cc:13:14: note:   template argument deduction/substitution failed:
a.cc:25:16: note:   cannot convert '"a"' (type 'const char [2]') to type 'char'
   25 |   dfs(dfs, "", "a");
      |                ^~~
Language: C++

#include <algorithm>
#include <cmath>
#include <iostream>
#include <map>
#include <numeric>
#include <string>
#include <vector>

using namespace std;

struct Memo {
	int fact = 0;
	int fact_inv = 0;
	int inv = 0;
};
class Combination {
private:
	int m_module = 1000000007;
	vector<struct Memo> memo;
public:
	int calculate(int, int);
	Combination(int, int);
};
int Combination::calculate(int n, int k) {
	return (memo[n].fact * memo[k].fact_inv * memo[n - k].fact_inv) % m_module;
}
Combination::Combination(int memo_max, int module = 1000000007) {
	m_module = module;
	memo.push_back({ 1,1,0 });
	memo.push_back({ 1,1,1 });
	for (int loop = 2; loop <= memo_max; loop++) {
		struct Memo temp;
		temp.fact = (memo[loop - 1].fact * loop) % m_module;
		temp.inv = m_module - memo[m_module % loop].inv * int(m_module / loop) % m_module;
		temp.fact_inv = (memo[loop - 1].fact_inv * temp.inv) % m_module;
		memo.push_back(temp);
	}
}

void A_Kth_Term(void) {

	int num[32] = { 1, 1, 1, 2, 1, 2, 1, 5, 2, 2, 1, 5, 1, 2, 1, 14, 1, 5, 1, 5, 2, 2, 1, 15, 2, 2, 5, 4, 1, 4, 1, 51 };
	
	int K;
	cin >> K;

	cout << num[K - 1] << flush;
	return;
}

void B_Bishop(void) {

	long long H, W;
	cin >> H >> W;

	cout << (H == 1 || W == 1) ? 1 : int((H * W + 1) / 2) << flush;
	return;
}

void C_Sqrt_Inequality(void) {

	long long a, b, c;
	cin >> a >> b >> c;

	cout << ((a + b < c && (c - a - b) * (c - a - b) - 4 * a * b > 0) ? "Yes" : "No") << flush;
	return;
}

void generate(vector<int>& S, int flag) {

	S[flag]++;
	
	if (flag > 0 && S[flag] == S[flag - 1] + 2) {
		S[flag] = 0;
		generate(S, flag - 1);
	}
	return;
}
void D_String_Equivalence(void) {

	int N;
	cin >> N;

	vector<int> S(N);
	for (int& it : S) it = 0;
	for (S[0] == 0) {
		for (int it : S) cout << char((int)'a' + it);
		cout << endl;
		generate(S, N - 1);
	}
	return;
}

int main(void) {

	//A_Kth_Term();
	//B_Bishop();
	//C_Sqrt_Inequality();
	D_String_Equivalence();
	return 0;
}


Compiler output:
a.cc: In function 'void B_Bishop()':
a.cc:56:63: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
   56 |         cout << (H == 1 || W == 1) ? 1 : int((H * W + 1) / 2) << flush;
      |                                          ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
a.cc: In function 'void D_String_Equivalence()':
a.cc:86:23: error: expected ';' before ')' token
   86 |         for (S[0] == 0) {
      |                       ^
      |                       ;
a.cc:91:9: error: expected primary-expression before 'return'
   91 |         return;
      |         ^~~~~~
a.cc:90:10: error: expected ';' before 'return'
   90 |         }
      |          ^
      |          ;
   91 |         return;
      |         ~~~~~~
a.cc:91:9: error: expected primary-expression before 'return'
   91 |         return;
      |         ^~~~~~
a.cc:90:10: error: expected ')' before 'return'
   90 |         }
      |          ^
      |          )
   91 |         return;
      |         ~~~~~~
a.cc:86:13: note: to match this '('
   86 |         for (S[0] == 0) {
      |             ^
Language: Java

import java.util.*;

public class Main{
	public static void main(String[] args) {
    	Scanner itr = new Scanner(System.in);
      	int n = itr.nextInt();
      
      	dfs("", 'a', n);
    
    }
  
  	public static void dfs(String s, char max, int n) {
    	if (n == s.length()) {
        	System.out.println(s);
          	return;
        }
      
      	for (char i = 'a'; i <= max; i++) {
        	dfs(s + i, (max == i ? (char)max + 1 : max), n);
        }
    }
}


Compiler output:
Main.java:19: error: incompatible types: bad type in conditional expression
        	dfs(s + i, (max == i ? (char)max + 1 : max), n);
        	                     ^
    possible lossy conversion from int to char
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
Language: Java

import java.util.*;

public class Main{
	public static void main(String[] args) {
    	Scanner itr = new Scanner(System.in);
      	int n = itr.nextInt();
      
      	dfs("", 'a', n);
    
    }
  
  	public static void dfs(String s, char max, int n) {
    	if (n == s.length()) {
        	System.out.println(s);
          	return;
        }
      
      	for (char i = 'a'; i <= max; i++) {
        	dfs(s + i, (max == i ? max + 1 : max), n);
        }
    }
}


Compiler output:
Main.java:19: error: incompatible types: bad type in conditional expression
        	dfs(s + i, (max == i ? max + 1 : max), n);
        	                     ^
    possible lossy conversion from int to char
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
1 error
Language: Java

import java.util.*;

public class Main{
	public static void main(String[] args) {
    	Scanner itr = new Scanner(System.in);
      	int n = itr.nextInt();
      
      	dfs("", 'a', n);
    
    }
  
  	public void dfs(String s, char max, int n) {
    	if (n == s.length()) {
        	System.out.println(s);
          	return;
        }
      
      	for (char i = 'a'; i <= max; i++) {
        	dfs(s + i, (max == i ? max + 1 : max));
        }
    }
}


Compiler output:
Main.java:8: error: non-static method dfs(String,char,int) cannot be referenced from a static context
      	dfs("", 'a', n);
      	^
Main.java:19: error: method dfs in class Main cannot be applied to given types;
        	dfs(s + i, (max == i ? max + 1 : max));
        	^
  required: String,char,int
  found:    String,int
  reason: actual and formal argument lists differ in length
Main.java:19: error: incompatible types: possible lossy conversion from int to char
        	dfs(s + i, (max == i ? max + 1 : max));
        	                     ^
Note: Some messages have been simplified; recompile with -Xdiags:verbose to get full output
3 errors
Language: C++

n = int(input())
s = [('', 0)]
cnt = 0
ans = []
while s:
    t, k = s.pop()
    if len(t) == n:
        print(t)
    else:
        s.append((t + chr(k + 97), k + 1))
        for i in range(k - 1, -1, -1):
            s.append((t + chr(i + 97), k))


Compiler output:
a.cc:2:7: error: empty character constant
    2 | s = [('', 0)]
      |       ^~
a.cc:1:1: error: 'n' does not name a type
    1 | n = int(input())
      | ^
Language: C++

import sys

N=int(input())
def num2alpha(num):
    return chr(97+num)
  
def Base_10_to_n(X, n):
    if (int(X/n)):
        return Base_10_to_n(int(X/n), n)+str(X%n)
    return str(X%n)
def Base_n_to_10(X,n):
    out = 0
    for i in range(1,len(str(X))+1):
        out += int(X[-i])*(n**(i-1))
    return out
print(''.join(['a']*N))
for i in range(N-1):
  a=['0']*N
  while True:
    temp=Base_10_to_n(Base_n_to_10(''.join(a),5)+1,N).zfill(N)
    a=[i for i in temp]
    print(''.join([num2alpha(int(i)) for i in a]))   
    #sys.exit()
    b=True
    for j in range(N-i-1):
      if a[N-i-1]>a[j]:
        b=False
        break
    if not b:
      break


Compiler output:
a.cc:16:7: error: empty character constant
   16 | print(''.join(['a']*N))
      |       ^~
a.cc:20:36: error: empty character constant
   20 |     temp=Base_10_to_n(Base_n_to_10(''.join(a),5)+1,N).zfill(N)
      |                                    ^~
a.cc:22:11: error: empty character constant
   22 |     print(''.join([num2alpha(int(i)) for i in a]))
      |           ^~
a.cc:23:6: error: invalid preprocessing directive #sys
   23 |     #sys.exit()
      |      ^~~
a.cc:1:1: error: 'import' does not name a type
    1 | import sys
      | ^~~~~~
a.cc:1:1: note: C++20 'import' only available with '-fmodules-ts'
Language: C++



#include<bits/stdc++.h>



#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)

using namespace std;

template <class T>
using vec = std::vector<T>;
typedef long long ll;
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }

const long long INF = 1LL<<60;

int lcm(int a,int b){
    //最小公倍数
    return a/__gcd(a,b) * b;
}


int N;


void dfs(string s,char mx){
    if(s,length()==N){
        cout<<s<<endl;
        //return;
    }else{
        for(char c='a';c<=mx;c++){
            dfs(s+c,
                    ((c==mx)? (char)(mx+1):mx)  );
        }
    }
}

int main()
{
    cin>>N;
    dfs("",'a');

    return 0;

}




Compiler output:
a.cc: In function 'void dfs(std::string, char)':
a.cc:30:10: error: 'length' was not declared in this scope
   30 |     if(s,length()==N){
      |          ^~~~~~
Language: C++



#include<bits/stdc++.h>



#define loop(i,a,b) for(int i=a;i<b;i++) 
#define rep(i,a) loop(i,0,a)

using namespace std;

template <class T>
using vec = std::vector<T>;
typedef long long ll;
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return true; } return false; }
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return true; } return false; }

const long long INF = 1LL<<60;

int lcm(int a,int b){
    //最小公倍数
    return a/__gcd(a,b) * b;
}


int N;


void dfs(string s,char mx){
    if(s,length()==N){
        cout<<s<<endl;
        //return;
    }else{
        for(char c='a',c<=mx;c++){
            dfs(s+c,
                    ((c==mx)? (char)(mx+1):mx)  );
        }
    }
}

int main()
{
    cin>>N;
    dfs("",'a');

    return 0;

}




Compiler output:
a.cc: In function 'void dfs(std::string, char)':
a.cc:30:10: error: 'length' was not declared in this scope
   30 |     if(s,length()==N){
      |          ^~~~~~
a.cc:34:25: error: expected ';' before '<=' token
   34 |         for(char c='a',c<=mx;c++){
      |                         ^~
      |                         ;
a.cc:34:25: error: expected primary-expression before '<=' token
   34 |         for(char c='a',c<=mx;c++){
      |                         ^~
Language: C++

#include<bits/stdc++.h>
#include<string>
using namespace std;
int N;
void dfs(string s,char mx)
{if(s.length() ==N)
{printf("%s\n",s.c_str());}
 else{for(char c='a';c<=mx;c++)
 {dfs(s+c, ((c==mx) ? (char)(mx+ 1) :mx));}
     }
}
int main(void)
{cin>>N;
 dfs("", 'a');
 return0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:2: error: 'return0' was not declared in this scope
   15 |  return0;
      |  ^~~~~~~