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

#include <iostream>
#include <map>

using namespace std;

int f(int a) {
  if (a % 2 == 0) {
    return a / 2;
  } else {
    return 3 * a + 1;
  }
}

int main() {
  int a;
  cin >> a;
  
  map<int, bool> present;
  int ct = 1;
  while (!present[f(ct]) {
    present[f(ct)] = true;
    ct++;
  }
                  
  cout << ct << endl;
                  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:20:23: error: expected ')' before ']' token
   20 |   while (!present[f(ct]) {
      |                    ~  ^
      |                       )
Language: C++

#include<iostream>
using namespace std ;

int fn (int n){

    if(n%2==0){
        n=n/2;
    }
    else{
        n=3*n+1;
    }
    return n;
}
int main () {
int A; cin >> A;
int count=0;
int i=1;
int table[1000000];
table[0]=A;
while(count==0){
    table[i]=fn(table[i-1]);
    for(int j=0;j<i;++j){
        if(table[i]==table[j]){count=i+1;}
    }
    i=i+1;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:26:2: error: expected '}' at end of input
   26 | }
      |  ^
a.cc:14:13: note: to match this '{'
   14 | int main () {
      |             ^
Language: C++

#include <bits/stdc++.h>
using namespace std;
#define REP(i, n) for(int i = 0;i < n;i++)
#define REPR(i, n) for(int i = n;i >= 0;i--)
#define FOR(i, m, n) for(int i = m;i < n;i++)
#define fi first
#define se second
#define itrfor(itr,A) for(auto itr = A.begin(); itr !=A.end();itr++)
template <class T> using reversed_priority_queue = priority_queue<T, vector<T>, greater<T> >;
typedef long long llong;
char moji[26]={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z'};
char moji2[26]={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
char moji3[10]={'0','1','2','3','4','5','6','7','8','9'};
#define Sort(a) sort(a.begin(),a.end());
#define Reverse(a) reverse(a.begin(),a.end());
#define print(a) cout << a << endl;
#define MOD llong(1e9+7)
#define MAX int(2 * 1e5 +5)
#define debug(x)  cout << #x << " = " << (x) << endl;
#define pi acos(-1.0)
#define int llong

signed main(){
	int s;
	cin >> s;
	int tmp,old;
	tmp = s;
	set<int> num_set;
	int m = 1; 
	num_set.append(s);
	while(1){
		m += 1;
		if(tmp%2==0){
			tmp /= 2;
		}
		else{
			tmp *= 3;
			tmp += 1;
		}
		if(num_set.find(tmp) != num_set.end()){
			break;
		}
		num_set.insert(tmp);
	}
	cout << m << endl;
	


}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:17: error: 'class std::set<long long int>' has no member named 'append'
   30 |         num_set.append(s);
      |                 ^~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int s;cin>>s;
  int count=0;
  while(s>4|s==3){
    if(s%2==0)s/=2;
    else s=2*s+1;
    count++}
  cout<<count;}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: expected ';' before '}' token
    9 |     count++}
      |            ^
      |            ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int s;cin>>s;
  for(int i=0;;i++){
    if(s==4)cout<<i+4;break;
    else if(s%2==0)s/=2;
    else s=3*s+1;}}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:7:5: error: 'else' without a previous 'if'
    7 |     else if(s%2==0)s/=2;
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int s;cin>>s;
  for(int i=0;;i++){
    if(s==4)break;
    cout<<i+4;
    else if(s%2==0)s/=2;
    else s=3*s+1;}}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: 'else' without a previous 'if'
    8 |     else if(s%2==0)s/=2;
      |     ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int s;cin>>s;
  for(int i=0;;i++){
    if(s==4)break;
    else if(s%2==0)s/=2;
    else s=3*s+1;}
  cout<<i+4;}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:9:9: error: 'i' was not declared in this scope
    9 |   cout<<i+4;}
      |         ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int s;cin>>s;
  for(int i=0;;i++){
    if(s==4)break;
    else if(s%2==0)s/=2;
    else s=3*s+1;}
  cout<<s[i];}
    

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

import java.util.*;
public class Main {
	public static void main(String[] args){
      	Scanner sc = new Scanner(System.in);
      	int a1 = sc.nextInt();
        int prev = 0;
        Map<Integer, Integer> map = new HashMap<>();
      	for (int i = 1; ; i++) {
          	if (i == 1) {
            	used.add(a1);
              	prev = a1;
            } else {
            	int val = helper(prev);
              	prev = val;
              	if (map.containsKey(val)) {
                	System.out.println(i);
                  	break;
                }
            }
        }
	}
  
    private static int helper(int n) {
    	if (n % 2 == 0) {
        	return n / 2;
        } else {
        	return 3 * n + 1;
        }
    }
}

Compiler output:
Main.java:10: error: cannot find symbol
            	used.add(a1);
            	^
  symbol:   variable used
  location: class Main
1 error
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
      	Scanner sc = new Scanner(System.in);
      	int a1 = sc.nextInt();
        int prev = 0;
        Set<Integer> used = new HashSet<>();
      	for (int i = 1; ; i++) {
          	if (i == 1) {
            	used.add(a1);
              	prev = a1
            } else {
            	int val = helper(prev);
              	prev = val;
              	if (used.contains(val)) {
                	System.out.println(i);
                  	break;
                }
            }
        }
	}
  
    private static int helper(int n) {
    	if (n % 2 == 0) {
        	return n / 2;
        } else {
        	return 3 * n + 1;
        }
    }
}

Compiler output:
Main.java:11: error: ';' expected
              	prev = a1
              	         ^
1 error
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
      	Scanner sc = new Scanner(System.in);
      	int a1 = sc.nextInt();
        int prev = 0;
        Set<Integer> used = new HashSet<>();
      	for (int i = 1; ; i++) {
          	if (i == 1) {
            	used.add(a1);
              	prev = a1
            } else {
            	int val = helper(prev);
              	if (used.contains(val)) {
                	System.out.println(i);
                  	break;
                }
            }
        }
	}
  
    private static int helper(int n) {
    	if (n % 2 == 0) {
        	return n / 2;
        } else {
        	return 3 * n + 1;
        }
    }
}

Compiler output:
Main.java:11: error: ';' expected
              	prev = a1
              	         ^
1 error
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// get a integer
		int a = sc.nextInt();
		// get two integers separated with half-width break
		Set<Integer> used = new HashSet<>();
      	for (int i = 1; ; i++) {
          	if (i == 1) {
            	used.add(a);
            } else {
            	int val = helper(i - 1);
              	if (used.contains(val)) {
                	System.out.println(i);
                  break;
                }
            }
        }
	}
  
    private int helper(int n) {
    	if (n % 2 == 0) {
        	return n / 2;
        } else {
        	return 3 * n + 1;
        }
    }
}

Compiler output:
Main.java:13: error: non-static method helper(int) cannot be referenced from a static context
            	int val = helper(i - 1);
            	          ^
1 error
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		// get a integer
		int a = sc.nextInt();
		// get two integers separated with half-width break
		Set<Integer> used = new HashSet<>();
      	for (int i = 1; ; i++) {
          	if (i == 1) {
            	used.add(a);
            } else {
            	int val = helper(i - 1);
              	if (used.contains(val)) {
                	return val;
                }
            }
        	return -1;
        }
	}
  
    private int helper(int n) {
    	if (n % 2 == 0) {
        	return n / 2;
        } else {
        	return 3 * n + 1;
        }
    }
}

Compiler output:
Main.java:13: error: non-static method helper(int) cannot be referenced from a static context
            	int val = helper(i - 1);
            	          ^
Main.java:15: error: incompatible types: unexpected return value
                	return val;
                	       ^
Main.java:18: error: incompatible types: unexpected return value
        	return -1;
        	       ^
3 errors
Language: C++

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

int main () {
  int s;
  cin >> s;
  
  bool flag = false;
  
  for (int i = 2; i < 1000001; i++) {
    if (s % 2 == 0) {
      s = s / 2;
    } else {
      s = 3 * s + 1;
      if (s == 4 && flag) {
        cout << i << endl;
        return 0;
      } else if (s == 4){
        flags = true;
      }
    }
  }
  
  return -1;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:9: error: 'flags' was not declared in this scope; did you mean 'flag'?
   19 |         flags = true;
      |         ^~~~~
      |         flag
Language: C++

#include <iostream> 
#include <iomanip> 
#include <vector> 
#include <algorithm> 
#include <numeric> 
#include <functional> 
#include <cmath> 
#include <queue> 
#include <stack> 

#define Ford(i,a,b) for (int i=(a);i<(b);i++) 
#define For(i,n) repd(i,0,n) 
typedef long long ll; 

using namespace std;

int main(){
  int s;
  int a[10000],i=1;
  cin>>s;
  a[0]=s;
  while(1){
    if(s%2==0) s /=2;
    else s = 3*s +1;
    
    i++;
    a[i]=s;
    for(int j=0;j<i;j++){
      if (a[j]==s) {
        cout << i << endl;
        retrun 0;
      }
     }
    
    if(i>=10000) return 0;
  }
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:31:9: error: 'retrun' was not declared in this scope
   31 |         retrun 0;
      |         ^~~~~~
Language: C

#include<stdio.h>

 
int main(void){
  
  int s;
  int list[10000000];
  scanf("%s",&s);
  
  int a = 1;
  list[a] += 1;
  for(n=1;n <= 100;n++){
    if(n % 2 == 0){
      a = a / 2;
    }else{
      a = 3*a + 1;
    }
    list[a] += 1;
    if(list[a] == 2){
      printf(n);
      break;
    }
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:7: error: 'n' undeclared (first use in this function)
   12 |   for(n=1;n <= 100;n++){
      |       ^
main.c:12:7: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>

 
int main(void){
  
  int s;
  int list[10000000];
  scanf("%s",&s);
  
  int a = 1;
  list[a] += 1;
  for(n=1;n <= 100;n++){
    if(n % 2 == 0){
      a = a / 2;
    }else{
      a = 3*a + 1;
    }
    list[a] += 1;
    if(list[a] == 2){
      print(n);
      break;
    }
  }
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:12:7: error: 'n' undeclared (first use in this function)
   12 |   for(n=1;n <= 100;n++){
      |       ^
main.c:12:7: note: each undeclared identifier is reported only once for each function it appears in
main.c:20:7: error: implicit declaration of function 'print'; did you mean 'printf'? [-Wimplicit-function-declaration]
   20 |       print(n);
      |       ^~~~~
      |       printf
Language: C++

//in progress
#include <bits/stdc++.h>
using namespace std;
#define ll long long int
#define fr(i,a,b) for(int i = (int)(a); i <= (int)(b); i++)
#define forn(i,n) for(int i =0; i < (int)(n); i++)
#define rfr(i,a,b) for(int i = (int)(a); i >= (int)(b); i--)
#define PI 3.14159265
rec(int ind,int n)
{
  if(n==1)
  return ind;
  if(n%2==0)
  return rec(ind+1,n/2);
  else
  return rec(ind+1,3*n+1);
}
int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  //freopen("a.in", "r", stdin);
  //freopen("a.out", "w", stdout);
  int n;
  cin>>n;
  if(n<=2)
  cout<<4<<"\n";
  else
  cout<<rec(0,n)+2<<"\n";
  return 0;
}


Compiler output:
a.cc:9:1: error: ISO C++ forbids declaration of 'rec' with no type [-fpermissive]
    9 | rec(int ind,int n)
      | ^~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int s;
  cin>>s;
 
if(s % 2 == 0){
    while(s != 1/2){
  cout << s << endl;
      s /= 2;
 }
if(s % 2 == 1){
  cout << s << endl;
      s *=3;
      s +=1;
  }
   }
   else{
  while(s % 2 == 1){
  cout << s << endl;
      s *=3;
      s +=1;
  }
        if(s % 2 == 0){
    while(s != 1/2){
  cout << s << endl;
      s /= 2;
 }
  }
  }

Compiler output:
a.cc: In function 'int main()':
a.cc:31:4: error: expected '}' at end of input
   31 |   }
      |    ^
a.cc:4:12: note: to match this '{'
    4 | int main() {
      |            ^
Language: C++

int CollatzNumber(int n)
{
	int c=0;
	
	while(n!=1)
	{
		if(n%2==0)
		{
			n=n/2;
		} else {
			n = n*3+1;
		}
		c+=1;
	}
	return 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 <vector>
using namespace std;

//定義
int abc116_b(){
    //入力
    int s,ans;
    bool flag = true;
    cin >> s;
    vector<int> v;
    v.push_back(s);
    
    //処理
    for(int i=0 ; flag ; ++i){
        if(v[i]%2){
            int a = 3*v[i]+1;
            v.push_back(a);
        }else{
            int a = v[i]/2;
            v.push_back(a);
        }
        for(int j=0 ; j<i+1 ; ++j){
            if(v[j]==v[i+1]){
                flag = false;
                ans = i+2;
                break;
            }
        }
    }
    
    //出力
    cout << ans << endl;
    return 0;
}

int main(){
    abc116_b();
    return 0;
}
#include <iostream>
#include <vector>
using namespace std;

//定義
int abc116_b(){
    //入力
    int s,ans;
    bool flag = true;
    cin >> s;
    vector<int> v;
    v.push_back(s);
    
    //処理
    for(int i=0 ; flag ; ++i){
        if(v[i]%2){
            int a = 3*v[i]+1;
            v.push_back(a);
        }else{
            int a = v[i]/2;
            v.push_back(a);
        }
        for(int j=0 ; j<i+1 ; ++j){
            if(v[j]==v[i+1]){
                flag = false;
                ans = i+2;
                break;
            }
        }
    }
    
    //出力
    cout << ans << endl;
    return 0;
}

int main(){
    abc116_b();
    return 0;
}


Compiler output:
a.cc:46:5: error: redefinition of 'int abc116_b()'
   46 | int abc116_b(){
      |     ^~~~~~~~
a.cc:6:5: note: 'int abc116_b()' previously defined here
    6 | int abc116_b(){
      |     ^~~~~~~~
a.cc:77:5: error: redefinition of 'int main()'
   77 | int main(){
      |     ^~~~
a.cc:37:5: note: 'int main()' previously defined here
   37 | int main(){
      |     ^~~~
Language: C++

#include<iostream>
#include<set>
#include<algorithm>
using namespace std;
int main() {
  int val; cin >> val;
  int i = 1;
  set<int> prev_a_vals;
  prev_a_vals.insert(val);
  while (true) {
    if (val % 2 == 0) val = val / 2;
    else val = val * 3 + 1;
    ++i;
    if (prev_a_vals.contains(val)) break;
  }
  cout << i << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:21: error: 'class std::set<int>' has no member named 'contains'
   14 |     if (prev_a_vals.contains(val)) break;
      |                     ^~~~~~~~
Language: C++

#include<iostream>
#include<set>
#incluse<algorithm>
using namespace std;
int main() {
  int val; cin >> val;
  int i = 1;
  set<int> prev_a_vals;
  prev_a_vals.insert(val);
  while (true) {
    if (val % 2 == 0) val = val / 2;
    else val = val * 3 + 1;
    ++i;
    if (prev_a_vals.contains(val)) break;
  }
  cout << i << endl;
}

Compiler output:
a.cc:3:2: error: invalid preprocessing directive #incluse; did you mean #include?
    3 | #incluse<algorithm>
      |  ^~~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:14:21: error: 'class std::set<int>' has no member named 'contains'
   14 |     if (prev_a_vals.contains(val)) break;
      |                     ^~~~~~~~
Language: C++

#include<iostream>
#include<set>
using namespace std;
int main() {
  int val; cin >> val;
  int i = 1;
  set<int> prev_a_vals;
  prev_a_vals.insert(val);
  while (true) {
    if (val % 2 == 0) val = val / 2;
    else val = val * 3 + 1;
    ++i;
    if (prev_a_vals.contains(val)) break;
  }
  cout << i << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:21: error: 'class std::set<int>' has no member named 'contains'
   13 |     if (prev_a_vals.contains(val)) break;
      |                     ^~~~~~~~
Language: C++

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

int main(){
  int s ;
  cin >> s ;
  vector<int>vec(1000000);
  vec.at(0) = s;
  for (int i = 1; i <1000000; i++){
    if (vec.at(i-1) % 2 ==  
    vec.at(i+1) = vec.at
  

Compiler output:
a.cc: In function 'int main()':
a.cc:10:25: error: lvalue required as left operand of assignment
   10 |     if (vec.at(i-1) % 2 ==
      |         ~~~~~~~~~~~~~~~~^~
   11 |     vec.at(i+1) = vec.at
      |     ~~~~~~~~~~~          
a.cc:11:25: error: expected ')' at end of input
   11 |     vec.at(i+1) = vec.at
      |                         ^
      |                         )
a.cc:10:8: note: to match this '('
   10 |     if (vec.at(i-1) % 2 ==
      |        ^
a.cc:11:25: error: expected statement at end of input
   11 |     vec.at(i+1) = vec.at
      |                         ^
a.cc:11:25: error: expected '}' at end of input
a.cc:9:35: note: to match this '{'
    9 |   for (int i = 1; i <1000000; i++){
      |                                   ^
a.cc:11:25: error: expected '}' at end of input
   11 |     vec.at(i+1) = vec.at
      |                         ^
a.cc:4:11: note: to match this '{'
    4 | int main(){
      |           ^
Language: C++

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

int main()
{
	int s;
	cin >> s;
	int ans = 0;
	vector<int> A(1000),B(1000);
	A[0] = s;
	B = { 0 };
	B[A[0]] = 1;
	for (int i = 0;i<1000;i++) {
		if (A[i] % 2 == 0) {
			A[i + 1] = A[i] / 2;
		}
		else if (A[i] % 2 == 1) {
			A[i + 1] = 3 * A[i] + 1;
		}
		B[A[i + 1]]++;
		if (B[A[i + 1]] == 2) {
			ans = i+1;
			break;
		}
	}
	cout << ans << endl;

Compiler output:
a.cc: In function 'int main()':
a.cc:28:29: error: expected '}' at end of input
   28 |         cout << ans << endl;
      |                             ^
a.cc:7:1: note: to match this '{'
    7 | {
      | ^
Language: Java

import java.util.Scanner;
import java.util.HashMap;
import java.util.Map;

public class Main {
  public static void main(String[] args) {
    Scanner sc = new Scanner(System.in);
    HashMap<Integer, Integer> a = new HashMap<>();
    int s = Integer.parseInt(sc.next());
    int m = 0;
    
    loop:
    for(int i = 1;; i++) {
      a.put(i, s);
      
      if(s % 2 == 1){
      	s = 3 * s + 1;
      } else {
        s = s / 2;
      }
      
      for(Map.Entry<Integer, Integer> entry : selects.entrySet()) {
        if(entry.getValue() == s) {
        	m = entry.getKey();
          break loop;
        }
      }
    }
    
    System.out.println(m);
  }
}

Compiler output:
Main.java:22: error: cannot find symbol
      for(Map.Entry<Integer, Integer> entry : selects.entrySet()) {
                                              ^
  symbol:   variable selects
  location: class Main
1 error
Language: Java

import java.util.Scanner;

class Main{
  
	public static void main(String[] args) {
     
    	Scanner sc = new Scanner(System.in);
     
    	int s = sc.nextInt();
     
    	int[]a = new int[1000000];
     
    	for (int i = 0; i  < a.length; i++){
    		if (i == 0)
         		a[i] = s;
       		else {
         		if (a[i-1] % 2 == 0){
           		a[i] = a[i-1] /2;
                }else{
           			a[i] = a[i-1] * 3 + 1;
                }
       			}
     		}
     
    	int c = 0;
     
     	if(a[1] == 1)
       		c = 4;
     	else if (a[i] == 2)
       		c = 4;
     	else if (a[i] == 4)
       		c =4;
     	else {
     		for (int i = 0; i < a.length; i++){
       			if(a[i] == 8){
        			c = i + 5;
         			break;
      		 	}
    	 	}
     	}
     
     	System.out.println(c);
     
     sc.close();
   }
}

Compiler output:
Main.java:29: error: cannot find symbol
     	else if (a[i] == 2)
     	           ^
  symbol:   variable i
  location: class Main
Main.java:31: error: cannot find symbol
     	else if (a[i] == 4)
     	           ^
  symbol:   variable i
  location: class Main
2 errors
Language: C++

//
//  ABC116B.cpp
//  programing
//
//  Created by 毛利源 on 2019/02/02.
//

#include<iostream>
using namespace std;


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

  int N_MAX =100000;
  int a[N_MAX];
  memset(a,0,sizeof(a));
  int ans = 0;
  while(true){
   ans++;
   if (s%2 == 0){
     if(a[s] ==0 ){
       a[s] = 1;
   		s /= 2;
     }else{break;}
  }else{
        if(a[s] ==0 ){
       a[s] = 1;
   		 s = 3*s +1;
     }else{break;}
   }
  }
    cout << ans << endl;
  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:3: error: 'memset' was not declared in this scope
   18 |   memset(a,0,sizeof(a));
      |   ^~~~~~
a.cc:9:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
    8 | #include<iostream>
  +++ |+#include <cstring>
    9 | using namespace std;
Language: C++

int main(){
  int s;
  cin >> s;
  
  int N_MAX =100000;
  int a[N_MAX] = memset(a,0,sizeof(a));
  int ans = 0; 
  while(true){
   ans++;
   if (s%2 == 0){
     if(a[s] ==0 ){
       a[s] = 1;
   		s /= 2;
     }else{break;}
  }else{
        if(a[s] ==0 ){
       a[s] = 1;
   		s = 3s +1;
     }else{break;}
   }
  }
    cout << ans << endl;
  return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:3:3: error: 'cin' was not declared in this scope
    3 |   cin >> s;
      |   ^~~
a.cc:6:18: error: 'memset' was not declared in this scope
    6 |   int a[N_MAX] = memset(a,0,sizeof(a));
      |                  ^~~~~~
a.cc:1:1: note: 'memset' is defined in header '<cstring>'; this is probably fixable by adding '#include <cstring>'
  +++ |+#include <cstring>
    1 | int main(){
a.cc:18:21: error: unable to find numeric literal operator 'operator""s'
   18 |                 s = 3s +1;
      |                     ^~
a.cc:22:5: error: 'cout' was not declared in this scope
   22 |     cout << ans << endl;
      |     ^~~~
a.cc:22:20: error: 'endl' was not declared in this scope
   22 |     cout << ans << endl;
      |                    ^~~~
Language: Java

import java.util.Scanner;

class Main{
  
   public static void main(String[] args) {
     
     Scanner sc = new Scanner(System.in);
     
     int s = sc.nextInt();
     
     int[]a = new int[1000000];
     
     for (int i == 0; i  < a.length; i++){
       if (i = 0)
         a[i] = s;
       else {
         if (a[i-1] % 2 ==0){
           a[i] = a[i-1] /2;
         }else{
           a[i] = a[i-1] * 3 +1;
         }
       }
     }
     
     int c = 0;
     
     for (int i = 0; i < a.length; i++){
       for (int j = 1; j < a.length; j++){
         if (a[i] == a[j]){
           c = j + 1;
           break;
         }
       }
     }
     
     System.out.println(c);
     
     sc.close();
   }
}

Compiler output:
Main.java:13: error: ';' expected
     for (int i == 0; i  < a.length; i++){
               ^
Main.java:13: error: illegal start of expression
     for (int i == 0; i  < a.length; i++){
                ^
Main.java:13: error: not a statement
     for (int i == 0; i  < a.length; i++){
                         ^
Main.java:13: error: ')' expected
     for (int i == 0; i  < a.length; i++){
                                   ^
Main.java:13: error: ';' expected
     for (int i == 0; i  < a.length; i++){
                                        ^
5 errors
Language: Java

import java.util.Scanner;

class Main{
  
   public static void main(String[] args) {
     
     Scanner sc = new Scanner(System.in);
     
     int s = sc.nextInt();
     
     int[]a = new int[1000000];
     
     for (int i = 0; i  < a.length; i++){
       if (i == 0)
         a[i] = s;
       else {
         if (a[i-1] % 2 ==0){
           a[i] = a[i-1] /2;
         }else{
           a[i] = a[i-1] * 3 +1;
         }
       }
     }
     
     int j;
     
     for (int i = 0; i < a.length; i++){
       for (j = 1; j < a.length; j++){
         if (a[i] == a[j])
           break;
       }
     }
     
     System.out.println(j + 1);
     
     sc.close();
   }
}

Compiler output:
Main.java:34: error: variable j might not have been initialized
     System.out.println(j + 1);
                        ^
1 error
Language: Java

import java.util.Scanner;

class Main{
  
   public static void main(String[] args) {
     
     Scanner sc = new Scanner(System.in);
     
     int s = sc.nextInt();
     
     int[]a = new int[1000000];
     
     for (int i = 0; i  < a.length; i++){
       if (i == 0)
         a[i] = s;
       else {
         if (a[i-1] % 2 == 0){
           a[i] = a[i-1] /2;
         }else{
           a[i] = a[i-1] * 3 +1;
         }
       }
     }
     
     int j;
     
     for (int i = 0; i < a.length; i++){
       for (j = 1; j < a.length; j++){
         if (a[i] = a[j])
           break;
       }
     }
     
     System.out.println(j + 1);
     
     sc.close();
   }
}

Compiler output:
Main.java:29: error: incompatible types: int cannot be converted to boolean
         if (a[i] = a[j])
                  ^
1 error
Language: Java

import java.util.Scanner;

class Main{
  
   public static void main(String[] args) {
     
     Scanner sc = new Scanner(System.in);
     
     int s = sc.nextInt();
     
     int[]a = new int[1000000];
     
     for (int i = 0; i  < a.length; i++){
       if (i = 0)
         a[i] = s;
       else {
         if (a[i-1] % 2 ==0){
           a[i] = a[i-1] /2;
         }else{
           a[i] = a[i-1] * 3 +1;
         }
       }
     }
     
     int j;
     
     for (int i = 0; i < a.length; i++){
       for (j = 1; j < a.length; j++){
         if (a[i] = a[j])
           break;
       }
     }
     
     System.out.println(j + 1);
     
     sc.close();
   }
}

Compiler output:
Main.java:14: error: incompatible types: int cannot be converted to boolean
       if (i = 0)
             ^
Main.java:29: error: incompatible types: int cannot be converted to boolean
         if (a[i] = a[j])
                  ^
2 errors
Language: C++

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

int main(){
    int s,n; cin >> s;
    int data;
    vector<int> a;
    for(int i=1;i>1;i++){
        if(i != 1){
            data = find(a.begin(),a.end(),s);
        }
        if(data != -1){
            break;
        }else if(s%2 == 0){
            s = s/2;
            a[i-1] = s;
        }else{
            s = 3*s + 1;
            a[i-1] = s;
        }  
    }
    cout << s << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:13:24: error: cannot convert '__gnu_cxx::__normal_iterator<int*, std::vector<int> >' to 'int' in assignment
   13 |             data = find(a.begin(),a.end(),s);
      |                    ~~~~^~~~~~~~~~~~~~~~~~~~~
      |                        |
      |                        __gnu_cxx::__normal_iterator<int*, std::vector<int> >
Language: Java


import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Collatz {
	
	public static void main(String args[])
	{
		Collatz col = new Collatz();
		Scanner sc = new Scanner(System.in);
		int input = sc.nextInt();
		List<Integer> number = new ArrayList<Integer>();
		number.add(input);
		int minimum = 1000000;
		for(int i = 1; i<= 100; i++)
		{
			int result;
			if(number.get(i-1) % 2 == 0)
				result = col.evenNumbers(number.get(i-1));
			else
				result = col.oddNumbers(number.get(i-1));
			
			if(number.contains(result) && result < minimum) {
				minimum = i+1;
				break;
			}
			number.add(result);
		}
		System.out.print(minimum);
		
	}
	
	public int oddNumbers(int x) {
		return 3*x + 1;
	}
	
	public int evenNumbers(int x) {
		return x/2;
	}
}


Compiler output:
Main.java:6: error: class Collatz is public, should be declared in a file named Collatz.java
public class Collatz {
       ^
1 error
Language: C++

#include <iostream>
#include <stdio.h>
#include <set> 

int func(int n){
    if(n%2==0){
        return n/2;
    }else{
        return 3*n+1;
    }
}

int main(void){
    int s,an;
    scanf("%d",&s);
    std::set<int> st;
    int an=s;
    int n=1;
    while(st.count(an)!=0){
        st.insert(an);
        an=func(an);
        n++;
    }
    printf("%d",n);
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:17:9: error: redeclaration of 'int an'
   17 |     int an=s;
      |         ^~
a.cc:14:11: note: 'int an' previously declared here
   14 |     int s,an;
      |           ^~
Language: Java

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner( System.in );
        int x = sc.nextInt();
      
        while(x != 1){
            if(x & 1 == 0){	//偶数の場合
                x /= 2;
            }else{			//奇数の場合
                x = x * 3 + 1;
            }
        }
        System.out.println(x + 1);
    }
}


Compiler output:
Main.java:8: error: bad operand types for binary operator '&'
            if(x & 1 == 0){	//?????
                 ^
  first type:  int
  second type: boolean
1 error
Language: Java

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner sc = new Scanner( System.in );
        int x = sc.nextInt();
      
        while(x != 1){
            if(x & 1 == 0){	//偶数の場合
                x /= 2;
            }else{			//奇数の場合
                x * 3 + 1;
            }
        }
        System.out.println(x + 1);
    }
}

Compiler output:
Main.java:11: error: not a statement
                x * 3 + 1;
                      ^
1 error
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main()
{
	int s;
  	cin >> s;
  	
  	vector<int>	value;
  
  	bool flg = true;
  
  	int num = 1;
  
  	while(flg)
    {
      	num++;	
      
    	if(s%2==0)
        {
			s /= 2;
        }
      	else
      	{
      		s = 3*s + 1;
        }
      
      	for(int i=0;i<value.size();i++)
        {
        	if(value[i] == s)
            {
            	printf("%d",num);	
              
              flg = false;
              break;
            }
        }
      
      	value.pushback(s);
    }

  	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:39:15: error: 'class std::vector<int>' has no member named 'pushback'; did you mean 'push_back'?
   39 |         value.pushback(s);
      |               ^~~~~~~~
      |               push_back
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main()
{
	int s;
  	cin >> s;
  	
  	vector<int>	value;
  
  	bool flg = true;
  
  	int num = 1;
  
  	while(flg)
    {
      	num++;	
      
    	if(s%2==0)
        {
			s /= 2;
        }
      	else
      	{
      		s = 3*s + 1;
        }
      
      	for(int i=0;i<value.length();i++)
        {
        	if(value[i] == s)
            {
            	printf("%d",num);	
              
              flg = false;
              break;
            }
        }
      
    }

  	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:28:29: error: 'class std::vector<int>' has no member named 'length'
   28 |         for(int i=0;i<value.length();i++)
      |                             ^~~~~~
Language: Java

import java.util.ArrayList;

import java.util.Scanner;

public class Main {



    public static void main(String[] args){

    	Scanner sc = new Scanner(System.in);
		arg.add(s);


    	// 入力

    	int s = sc.nextInt();

    	ArrayList<Integer> arg = new ArrayList<>();

    	int i;



    	for (i = 0; i < 1000002; i++ ){

        	if(s % 2 == 0){

        		s = s / 2;

        	} else {

        		s = 3 * s + 1;

        	}



        	if (arg.contains(s)){

        		break;



        	}

        	arg.add(s);



    	}



    	// 出力

    	System.out.println(i+2);

    }

}

Compiler output:
Main.java:12: error: cannot find symbol
		arg.add(s);
		        ^
  symbol:   variable s
  location: class Main
Main.java:12: error: cannot find symbol
		arg.add(s);
		^
  symbol:   variable arg
  location: class Main
2 errors
Language: C++

#include<bits/stdc++.h>

int main(){
  
  int s, i;
  
  map<int,int>mp;
  
  cin >> s;
  
  mp[s]++;
  
  i = 1;
  
  while(1 == 1){
    
    i++;
    
    if(s % 2 == 0){
      
      s = s/2;
      
      mp[s]++;
    }
    else{
      
      s = 3*s + 1;
      
      mp[s]++;
    }
    if(mp[s] > 1){
      
      cout << i;
      
      return 0;
    }
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'map' was not declared in this scope
    7 |   map<int,int>mp;
      |   ^~~
a.cc:7:3: note: suggested alternatives:
In file included from /usr/include/c++/14/map:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:152,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_map.h:102:11: note:   'std::map'
  102 |     class map
      |           ^~~
/usr/include/c++/14/map:89:13: note:   'std::pmr::map'
   89 |       using map
      |             ^~~
a.cc:7:7: error: expected primary-expression before 'int'
    7 |   map<int,int>mp;
      |       ^~~
a.cc:9:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |   cin >> s;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:11:3: error: 'mp' was not declared in this scope
   11 |   mp[s]++;
      |   ^~
a.cc:33:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   33 |       cout << i;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF (2e9)
#define EPS (1e-7)
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
 


int finder(int s) {
    int pre=-1, now=-1, cnt=0;
    now = s;
    while(true) {
        cnt++;
        pre = now;
        now = func(now);
        if (pre==now) {
            break;
        }
    }
    return cnt;
}

int func(int n) {
    int r;
    n%2==0 ? r=n/2 : r=3*n + 1;
    return r;
}

int main() {
    int s, ans;
    cin >> s;
    ans = finder(s);
    cout << ans << endl;
}

Compiler output:
a.cc: In function 'int finder(int)':
a.cc:19:15: error: 'func' was not declared in this scope
   19 |         now = func(now);
      |               ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF (2e9)
#define EPS (1e-7)
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
 
int main() {
    int s, ans;
    cin >> s;
    ans = finder(s);
    cout << ans << endl;
}

int finder(int s) {
    int pre=-1, now=-1, cnt=0;
    now = s;
    while(true) {
        cnt++;
        pre = now;
        now = func(now);
        if (pre==now) {
            break;
        }
    }
    return cnt;
}

int func(int n) {
    int r;
    n%2==0 ? r=n/2 : r=3*n + 1;
    return r;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:11: error: 'finder' was not declared in this scope; did you mean 'rindex'?
   14 |     ans = finder(s);
      |           ^~~~~~
      |           rindex
a.cc: In function 'int finder(int)':
a.cc:24:15: error: 'func' was not declared in this scope
   24 |         now = func(now);
      |               ^~~~
Language: C++

#include <bits/stdc++.h>
#define REP(i, n) for(int i = 0; i < n; i++)
#define REPR(i, n) for(int i = n; i >= 0; i--)
#define FOR(i, m, n) for(int i = m; i < n; i++)
#define INF (2e9)
#define EPS (1e-7)
#define ALL(v) v.begin(), v.end()
using namespace std;
typedef long long ll;
 
int main() {
    int s, ans;
    cin >> s;
    ans = finder(s);
    cout << ans << endl;
}

int finder(int s) {
    int pre=-1, now=-1, cnt=0;
    now = s;
    while(true) {
        cnt++;
        pre = now;
        now = func(now);
        if (pre==now) {
            break
        }
    }
    return cnt;
}

int func(int n) {
    int r;
    n%2==0 ? r=n/2 : r=3*n + 1;
    return r;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:11: error: 'finder' was not declared in this scope; did you mean 'rindex'?
   14 |     ans = finder(s);
      |           ^~~~~~
      |           rindex
a.cc: In function 'int finder(int)':
a.cc:24:15: error: 'func' was not declared in this scope
   24 |         now = func(now);
      |               ^~~~
a.cc:26:18: error: expected ';' before '}' token
   26 |             break
      |                  ^
      |                  ;
   27 |         }
      |         ~
Language: C++

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

int NextNum( int num )
{
	if ( num % 2 == 0 ) {
		return num / 2;
	}
	else {
		return 3 * num + 1;
	}
}

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

	int next = s;
	set<int> nums;
	nums.insert( next );

	int idx = 1;
	while ( true ) {
		next = NextNum( next );
		set<int>::iterator iter;
		pair<set<int>::iterator, bool> res =
			nums.insert( next );
		if ( res.second ) {
			return cout << idx + 1 << endl;
		}
		++idx;
	}

	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:30:48: error: cannot convert 'std::basic_ostream<char>::__ostream_type' {aka 'std::basic_ostream<char>'} to 'int' in return
   30 |                         return cout << idx + 1 << endl;
      |                                ~~~~~~~~~~~~~~~~^~~~~~~
      |                                                |
      |                                                std::basic_ostream<char>::__ostream_type {aka std::basic_ostream<char>}
Language: Java

import java.util.*;
public class Main {
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
      int a=sc.nextInt();
      int foo[] = new int[1000000];
      foo[0]=a:
      
      for(int i=0;i<foo[].length;i++;){
        
        
        
       
      }
      
      
      System.out.plintln(c);
		
	}
}

Compiler output:
Main.java:7: error: ';' expected
      foo[0]=a:
              ^
Main.java:9: error: class expected
      for(int i=0;i<foo[].length;i++;){
                          ^
Main.java:9: error: ')' expected
      for(int i=0;i<foo[].length;i++;){
                                    ^
Main.java:9: error: illegal start of expression
      for(int i=0;i<foo[].length;i++;){
                                     ^
4 errors
Language: C++

#include<iostream>
using namespace std;
int main(){
  int a[1000005];
  int s,i=2,ans=0,m;
  cin >> s;
  a[1]=s;
  while(1){
    if(a[i-1]%2==0){
      a[i]=a[i-1]/2;
    }else{
      a[i]=3*a[i-1]+1;
    }
    for(int j=1;j<i;j++){
      if(a[j]==a[i]){
	ans=1;
	m=i;
      }
    }
    if(ans==1){
      break;
    }
    i++;
  }
  cout << m << '\n';
  return 0;
}
#include<iostream>
using namespace std;
int main(){
  int a[1000005];
  int s,i=2,ans=0,m;
  cin >> s;
  a[1]=s;
  while(1){
    if(a[i-1]%2==0){
      a[i]=a[i-1]/2;
    }else{
      a[i]=3*a[i-1]+1;
    }
    for(int j=1;j<i;j++){
      if(a[j]==a[i]){
	ans=1;
	m=i;
      }
    }
    if(ans==1){
      break;
    }
    i++;
  }
  cout << m << '\n';
  return 0;
}

Compiler output:
a.cc:30:5: error: redefinition of 'int main()'
   30 | int main(){
      |     ^~~~
a.cc:3:5: note: 'int main()' previously defined here
    3 | int main(){
      |     ^~~~
Language: C++

#include<stdio.h>

bool hori[1000100];
signed main(){
int n;
scanf("%d", &n);
for ( int i = 1; true; i++ ) {
if ( n & 1 ) {
n = n * 3 + 1
}
else {
n /= 2;
}
if ( hori[n] ) {
printf("%d\n", i);
return 0;
}
hori[n] = true;
}
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: expected ';' before '}' token
    9 | n = n * 3 + 1
      |              ^
      |              ;
   10 | }
      | ~
Language: C++

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



int main()
{
	int  AB, BC, CA;
	cin >> AB, BC, CA;
	cout << (AB*BC) / 2; << endl;


}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:30: error: expected primary-expression before '<<' token
   12 |         cout << (AB*BC) / 2; << endl;
      |                              ^~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

void main() {
	int s, tmp, last, i;
	vector<int> data;
	vector<int>::iterator itr;

	cin >> s;

	for (i = 1;; i++) {
		if (i == 1) {
			last = s;
			data.push_back(s);
		}
		if (last % 2 == 0) { //偶数
			tmp = last / 2;
		}
		else {	//奇数
			tmp = (3 * last) + 1;
		}
		itr = find(data.begin(), data.end(), tmp);

		if (itr != data.end()) {
			break;
		}

		last = tmp;
		data.push_back(tmp);
	}

	cout << i+1;

}

Compiler output:
a.cc:7:1: error: '::main' must return 'int'
    7 | void main() {
      | ^~~~
Language: C++

#ifdef LOCAL
#include <cstdio>
#include <vector>
#include <algorithm>
#include <iostream>
#include <cstring>
#include <unordered_set>
#else
#include <bits/stdc++.h>
#endif
using namespace std ;

typedef long long ll ;
#define rep(i , n ) for ( int i =0; i < n ; i++)
#define _sort(arg) sort(begin(arg), end(arg))
#define MOD 1000000007
#define pb push_back
#define DEBUG(x) cout << #x << ": " << x << endl;

/*
__attribute__((constructor))
void initial()
{
	cin.tie(NULL);
	ios::sync_with_stdio(false);
}
*/

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

	int s;
	
	cin >> s;

	std::vector<int> a;
	//unordered_set<int> b;

	a.pb(0);
	a.pb(s);
	
	int i = 1;

	while(true)
	{
		int tmp = 0;
		if (a[i] & 1)
		{
			//a.pb(a[i] * 3 + 1);
			tmp = a[i] * 3 + 1;
		}
		else
		{
			//a.pb(a[i] / 2);
			tmp = a[i] / 2;
		}

		
		if (a.find(a.begin(), a.end(), tmp) != a.end())
		{
			break;
		}

		a.pb(tmp);
		

	}

	cout << i+1 << endl;
	
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:61:23: error: 'class std::vector<int>' has no member named 'find'
   61 |                 if (a.find(a.begin(), a.end(), tmp) != a.end())
      |                       ^~~~
Language: C++

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

int main(){
  int s, i;
  cin >> s;
  std::unordered_map<int> mem(1000000);
  
  for(i = 0; true; i++){
    s = (s % 2 == 0) ? (s / 2): (s * 3 + 1);
    if( !mem.insert(s).second ) break;
  }
  cout << i << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:25: error: wrong number of template arguments (1, should be at least 2)
    7 |   std::unordered_map<int> mem(1000000);
      |                         ^
In file included from /usr/include/c++/14/unordered_map:41,
                 from /usr/include/c++/14/functional:63,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:53,
                 from a.cc:1:
/usr/include/c++/14/bits/unordered_map.h:109:11: note: provided for 'template<class _Key, class _Tp, class _Hash, class _Pred, class _Alloc> class std::unordered_map'
  109 |     class unordered_map
      |           ^~~~~~~~~~~~~
a.cc:11:14: error: request for member 'insert' in 'mem', which is of non-class type 'int'
   11 |     if( !mem.insert(s).second ) break;
      |              ^~~~~~
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main (){
  vector<int> vec(1000000);
  cin>>vec[0];
  int a,b=0,ans=0;
  for(int i=0;i<1000000;i++){
    if(vec[i]%2==0){
      vec[i+1]=vec[i]/2;
  }else if(vec[i]%2==0){
      vec[i+1]=vec[i]*3+1;
  }
    for(int j=0;j<1000000;j++){
    if(vec[j]==4&&b==0){
      b++;
   }else if(vec[j]==4&&b==1){
      ans=j-1;
      break;
      }
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:2: error: expected '}' at end of input
   23 | }
      |  ^
a.cc:4:12: note: to match this '{'
    4 | int main (){
      |            ^
Language: C++

#include <iostream>
#include <vector>
using namespace std;
int main (){
  vector<int> vec(1000000);
  cin>>vec[0];
  int a,b=0,ans=0;
  for(int i=0;i<1000000;i++){
    if(vec[i]%2==0)
      vec[i+1]=vec[i]/2;
    else if(vec[i]%2==0)
      vec[i+1]=vec[i]*3+1;
  }
    for(int j=0;j<1000000;j++){
    if(vec[j]==4&&b==0)
      b++;
    else if(vec[j]==4&&b==1)
      ans=i-1;
  }
  cout<<ans<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:11: error: 'i' was not declared in this scope
   18 |       ans=i-1;
      |           ^
Language: C++

    #include<iostream>
    #include <set>
     
    using namespace std;
     
    int main(){
      int a;
      cin>>a;
      
      set<int> values;
      int ans = a;
      int ansv;
      
      while(1){
        if(ans%2==0){
          ans = ans / 2;
        }else{
          ans = 3 * ans + 1;
        }
        values.insert(ans);
        if (values.size()!=i+1){
          ansv = i+2;
          break;
        }
      }
      cout << ansv << endl;
      return 0;
    }

Compiler output:
a.cc: In function 'int main()':
a.cc:21:28: error: 'i' was not declared in this scope
   21 |         if (values.size()!=i+1){
      |                            ^
Language: C++

#include<iostream>
#include<algorithm>
#include<vector>
using namespace std;
int main(){
int s;
  cin>>s;
int ans=0;

vector<long long> a(1000000);
  a.at(0)=s;
  for(int i=1;i<1000000;i++){
    if(a.at(i-1)%2==0)
      a.at(i)=a.at(i-1)/2;
    if(a.at(i-1)%2==1)
      a.at(i)=a.at(i-1)*3+1;
    if(a.at(i)==4)
 ans=j+3;
  break;
}
    
}
  cout<<ans<<endl;
return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:6: error: 'j' was not declared in this scope
   18 |  ans=j+3;
      |      ^
a.cc: At global scope:
a.cc:23:3: error: 'cout' does not name a type
   23 |   cout<<ans<<endl;
      |   ^~~~
a.cc:24:1: error: expected unqualified-id before 'return'
   24 | return 0;
      | ^~~~~~
a.cc:25:1: error: expected declaration before '}' token
   25 | }
      | ^
Language: C++

#include<bist/stdc++.h>
using namespace std;
int a[1000],f[1000];
int main()
{
	long long m,n,k,j,i=0;
	scanf("%lld",&n);	
	while(1)
	{
		if(i==0&&n%2==0)
			a[i+1]=n/2;
		else if(i!=0&&n%2==0)
			a[i+1]=a[i]/2;
		else
			a[i+1]=a[i]*3+1;
		for(j=0;j<i;j++)
		{
			if(a[i]==a[j])
			{
				printf("%lld",i);
				return 0;
			}
		}
		i++;
	}
	return 0;
}

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

#include<bist/stdc++.h>
using namespace std;
int a[1000],f[1000];
int main()
{
	int m,n,k,j,i=0;
	scanf("%d",&n);	
	while(1)
	{
		if(i==0&&n%2==0)
			a[i+1]=n/2;
		else if(i!=0&&n%2==0)
			a[i+1]=a[i]/2;
		else
			a[i+1]=a[i]*3+1;
		for(j=0;j<i;j++)
		{
			if(a[i]==a[j])
			{
				printf("%d",i);
				return 0;
			}
		}
		i++;
	}
	return 0;
}


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

#include <windows.h>
#include <bits/stdc++.h>#include <bits/stdc++.h>
using namespace std;
vector<int> t;
int main()
{
	ios::sync_with_stdio(false);
	long long s,ans=-1;
	cin>>s;
	long long x=s;
	t.push_back(x);
	for(int i=2;i<=(0x3f3f3f3f);i++)
	{
		if(x%2)	x=(3*x)+1;
		else	x=x/2;
		t.push_back(x);
	}
	for(int i=1;i<=t.size()+1;i--)
	{
		for(int j=i-1;j>=1;i--)
		{
			if(t[i]==t[j])
			{
				cout<<i;
				return 0;
			}
		}
	}
}


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