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

#include<iostream>
using namespace std;
#include<math.h>
#include<algorithm>

int main() {
  long int a[4];
  for(int i = 0; i < 4; i++) {
    cin >> a[i];
  }
  unsigned long long int temp;
  for(int i = 0; i < 2; i++) {
    for(int j = 2; j < 4; j++) {
      if((a[i] > 0 && a[j] > 0) || (a[i] < 0 && a[j] < 0)) {
        unsigned long long int pMax = 0;
        temp = abs(a[i]) * abs(a[j]);
        pMax = max(temp, pMax);
      } else {
        long long int pMax = 0;
        temp = a[i] * a[j];
        pMax = max(temp, pMax);
      }
    }
  }
  cout << pMax << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:21:19: error: no matching function for call to 'max(long long unsigned int&, long long int&)'
   21 |         pMax = max(temp, pMax);
      |                ~~~^~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   template argument deduction/substitution failed:
a.cc:21:19: note:   deduced conflicting types for parameter 'const _Tp' ('long long unsigned int' and 'long long int')
   21 |         pMax = max(temp, pMax);
      |                ~~~^~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:21:19: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long unsigned int'
   21 |         pMax = max(temp, pMax);
      |                ~~~^~~~~~~~~~~~
a.cc:25:11: error: 'pMax' was not declared in this scope
   25 |   cout << pMax << endl;
      |           ^~~~
Language: C++

#include<bits/stdc++.h>
//#include <boost/multiprecision/cpp_int.hpp> 
//using namespace boost::multiprecision; 

using namespace std;

//#Rohitpratap311
//#Keep Calm And Stay Happy

typedef long long ll;
typedef long double ld;

bool ifprime(ll n)
{
    if(n==2||n==3) { return true ; }
    for(ll i=2;i<=sqrt(n);i++)
    {
        if(n%i==0) { return false; }
    }
    return true;
}

ll gcd(ll a,ll b)
{
    if(b==0) { return a; }
    return gcd(b,a%b);
}
 
ll lcm(ll a,ll b)
{
    return (a*b)/gcd(a,b);
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll t=1;
    //cin>>t;
    while(t--)
    {
      	ll a,b,c,d;
      	cin>>a>>b>>c>>d;
      	if((b>0)&&(d>0)) cout<<b*d;
      	else if((b<0)&&(d<0)) cout<<a*c;
      	else if(b==0&&d==0)   cout<<b*d;
      	else if(b>0)&&(d<0)   cout<<a*d;
      	else if(b<0)&&(d>0)   cout<<b*c;
      	else if((b==0)&&(d>0)) cout<<"0";
      	else if((d==0)&&(b>0)) cout<<"0";
      	else if cout<<a*c;
    
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:47:23: error: expected identifier before '(' token
   47 |         else if(b>0)&&(d<0)   cout<<a*d;
      |                       ^
a.cc:48:23: error: expected identifier before '(' token
   48 |         else if(b<0)&&(d>0)   cout<<b*c;
      |                       ^
a.cc:51:17: error: expected '(' before 'cout'
   51 |         else if cout<<a*c;
      |                 ^~~~
      |                 (
Language: C++

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

int main()
{
  long long int a, b, c, d, ans=LLONG_MIN;	cin>>a>>b>>c>>d;
  
  vector<long long int> v1, v2;
  v1.push_back(a);
  v1.push_back(b);
  if(a+1<b)	v1.push_back(a+1);
  if(b-1>a)	v1.push_back(b-1);
  
  v2.push_back(c);
  v2.push_back(d);
  if(c+1<d)	v2.push_back(c+1);
  if(d-1>c)	v2.push_back(d-1);
  
  for(int i=0; i<v1.size(); i++)
    for(int j=0; j<v2.size(); j++)
      ans = max(ans, v1[i]*v2[j]; 
    cout<<ans;
}

static int fastio = []() {
    #define endl '\n'
    ios::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(0);
    return 0;
}();


Compiler output:
a.cc: In function 'int main()':
a.cc:21:33: error: expected ')' before ';' token
   21 |       ans = max(ans, v1[i]*v2[j];
      |                ~                ^
      |                                 )
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
    long long a,b,c,d,i,j,p,m,s;
    cin>>a>>b>>c>>d;
    long long l=a*c;
    for(i=a;i<=b;i++)
    {
        for(j=c;j<=d;j++)
        {
           p=i*j; 
           if(p>h)
          {
              h=p;
          }
        }
    }
    cout<<h;
}




Compiler output:
a.cc: In function 'int main()':
a.cc:13:17: error: 'h' was not declared in this scope
   13 |            if(p>h)
      |                 ^
a.cc:19:11: error: 'h' was not declared in this scope
   19 |     cout<<h;
      |           ^
Language: C++


#include<bits/stdc++.h>
#define endl "\n" 
#define pi acos(-1)
#define ll long long 
using namespace std;
void solve();
int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);cout.tie(NULL);
    #ifndef ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
        freopen("output.txt", "w", stdout);
    #endif
    int q=1;//cin>>q;
    while(q--){
        solve();
    }
    return 0;
}
void solve(){
ll int a,b,c,d;cin>>a>>b>>c>>d;
  cout<<max(a*c,max(a*d,max(b*c,b*d)))<<endl;
}
  
}


Compiler output:
a.cc:26:1: error: expected declaration before '}' token
   26 | }
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
main(){
  long int a,b,c,d;
  cin>>a>>b>>c>>d;
  cout << max(b*d,max(a*c,max(a*d,(b*c))));<<endl;
  }

Compiler output:
a.cc:3:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    3 | main(){
      | ^~~~
a.cc: In function 'int main()':
a.cc:6:44: error: expected primary-expression before '<<' token
    6 |   cout << max(b*d,max(a*c,max(a*d,(b*c))));<<endl;
      |                                            ^~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
    long long a,b,c,d,ans;
    cin>>a>>b>>c>>d;
    if(a<0 && c>0 || a>0 && c<0)ans = a*c;
    else ans = b*d
    cout<<ans<<endl;
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: expected ';' before 'cout'
    7 |     else ans = b*d
      |                   ^
      |                   ;
    8 |     cout<<ans<<endl;
      |     ~~~~
Language: C++

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

int main() {
    double a, b, c, d;
    cin >> a >> b >> c >> d;

    int a[4] = [a*c, a*d, b*c, b*d];
    cout << max(a) << endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:9: error: conflicting declaration 'int a [4]'
    8 |     int a[4] = [a*c, a*d, b*c, b*d];
      |         ^
a.cc:5:12: note: previous declaration as 'double a'
    5 |     double a, b, c, d;
      |            ^
a.cc:8:18: error: expected ',' before '*' token
    8 |     int a[4] = [a*c, a*d, b*c, b*d];
      |                  ^
      |                  ,
a.cc:8:18: error: expected identifier before '*' token
a.cc:8:20: error: expected ']' before ',' token
    8 |     int a[4] = [a*c, a*d, b*c, b*d];
      |                    ^
      |                    ]
a.cc: In lambda function:
a.cc:8:20: error: expected '{' before ',' token
a.cc: In function 'int main()':
a.cc:8:23: error: expected initializer before '*' token
    8 |     int a[4] = [a*c, a*d, b*c, b*d];
      |                       ^
a.cc:9:16: error: no matching function for call to 'max(double&)'
    9 |     cout << max(a) << endl;
      |             ~~~^~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 1 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   template argument deduction/substitution failed:
a.cc:9:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
    9 |     cout << max(a) << endl;
      |             ~~~^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   candidate expects 2 arguments, 1 provided
Language: C++

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

int main(){
  int a,b,c,d;
  cin>>a,b,c,d;
  int ans=0,cul=0;
  for int(i=a;i<b+1;i++){
   for int(j=c;j<d+1;j++){
     cul=i*j;
     if(cul>ans){
      ans=cul; 
     }
   }
  }
  
  
  cout<<ans<<endl;
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:7: error: expected '(' before 'int'
    8 |   for int(i=a;i<b+1;i++){
      |       ^~~
      |       (
a.cc:8:11: error: 'i' was not declared in this scope
    8 |   for int(i=a;i<b+1;i++){
      |           ^
a.cc:9:8: error: expected '(' before 'int'
    9 |    for int(j=c;j<d+1;j++){
      |        ^~~
      |        (
a.cc:9:12: error: 'j' was not declared in this scope
    9 |    for int(j=c;j<d+1;j++){
      |            ^
Language: C

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

int main(){
  long a,b,c,d;
  cin >> a >> b >> c >> d;
  
  if(b > 0 && d < 0){
    cout << a * d << endl;
  }else if(b < 0 && d > 0){
    cout << b * c << endl;
  }else if(b > 0 && d > 0){
    cout << b * d << endl;
  }else{
    cout << a * c << endl;
  }
}

  
  

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

#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define  pb push_back
#define sort1(v) sort(v.begin(),v.end())
#include <sstream>
//cout<<fixed<<setprecision(n)<<number - for n digits after decimal
long long int max(ll a,ll b)
{
    if(a>b)
        return a;
    else
        return b;
}
void print(vector<int>arr)
{
    for(int i=0;i<(int)arr.size();i++)
        cout<<arr[i]<<" ";
    cout<<"\n";
}
void upd(int a[],int l,int r,int num)
{
    for(int i=l;i<=r;i++)
        a[i]+=num;
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll a,b,c,d;
    cin>>a>>b>>c>>d;
    ll ans=max(a*c,b*d);
  	ll ans2=max(b*c,a*d);
  	ll ans=max(ans,ans2);
    cout<<ans;
}








Compiler output:
a.cc: In function 'int main()':
a.cc:34:12: error: redeclaration of 'long long int ans'
   34 |         ll ans=max(ans,ans2);
      |            ^~~
a.cc:32:8: note: 'long long int ans' previously declared here
   32 |     ll ans=max(a*c,b*d);
      |        ^~~
Language: C++

  array<ll, 4> arr;
  for (auto &e : arr) {
    cin >> e;
  }
  ll mx = arr[0] * arr[1];
  for (int i = 0; i < 4; ++i) {
    for (int j = 0; j < 4; ++j) {
      mx = max(mx, arr[i] * arr[j]);
    }
  }
  cout << mx << '\n';
  return 0;
}



Compiler output:
a.cc:1:3: error: 'array' does not name a type
    1 |   array<ll, 4> arr;
      |   ^~~~~
a.cc:2:3: error: expected unqualified-id before 'for'
    2 |   for (auto &e : arr) {
      |   ^~~
a.cc:5:3: error: 'll' does not name a type
    5 |   ll mx = arr[0] * arr[1];
      |   ^~
a.cc:6:3: error: expected unqualified-id before 'for'
    6 |   for (int i = 0; i < 4; ++i) {
      |   ^~~
a.cc:6:19: error: 'i' does not name a type
    6 |   for (int i = 0; i < 4; ++i) {
      |                   ^
a.cc:6:26: error: expected unqualified-id before '++' token
    6 |   for (int i = 0; i < 4; ++i) {
      |                          ^~
a.cc:11:3: error: 'cout' does not name a type
   11 |   cout << mx << '\n';
      |   ^~~~
a.cc:12:3: error: expected unqualified-id before 'return'
   12 |   return 0;
      |   ^~~~~~
a.cc:13:1: error: expected declaration before '}' token
   13 | }
      | ^
Language: C++

//Keep calm and carry on..

/*  Problem :
    URL :

*/

#include<bits/stdc++.h>

using namespace std;
typedef long long int ll;
typedef unsigned long long int ull;
typedef long double ld;


# define fast           ios_base::sync_with_stdio(false),cin.tie(NULL),cout.tie(NULL);
# define pb             push_back
# define pi             3.1415926535897932384626
# define mod            1000000007
# define endl          '\n'
# define DEBUG          false
# define F              first
# define S              second
# define loop1(i,a,b)   for(ll i = a; i<b; i++)
# define loop2(i,a,b)   for(ll i = b-1; i>=a; i--)
# pragma GCC optimize "trapv"


 int main(){
     fast;
     int a,b,c,d;		cin>>a>>b>>c>>d;
     int x = 1, y = 1;
     if ( ((b*d) > 0) || ((a*b) > 0)) ) 	cout<<max(b*d,a*b); 
     else {
      cout<<a*c;
       
     }
     

     return 0;
}



Compiler output:
a.cc: In function 'int main()':
a.cc:33:39: error: expected primary-expression before ')' token
   33 |      if ( ((b*d) > 0) || ((a*b) > 0)) )         cout<<max(b*d,a*b);
      |                                       ^
Language: C++

//Code by a weak man who named tarjin, and he hopes the code can get more points.
#include<cstdio>
#include<iostream>
#include<algorithm>
#include<cstring>
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
ll a,b,c,d;
int main(void)
{
	scanf("%lld%lld%lld%lld",&a,&b,&c,&d);
	if(a<0&&b<0&&c>0&&d>0)
	{
		printf("%lld\n",b*c);
		return 0;
	}
	if(a>0&&b>0&&c<0&&d<0)
	{
		printf("%lld\n",a*d);
		return 0;
	}
	if(max(abs(a),abs(b))*max(abs(c),abs(d))>0)
	{
		printf("%lld\n",max(abs(a),abs(b))*max(abs(c),abs(d)));
		return 0;
	}
	printf("%lld\n",max(max(abs(a),abs(b)))*c,max((c),abs(d))*b);
	return 0;  
}   

Compiler output:
a.cc: In function 'int main()':
a.cc:28:28: error: no matching function for call to 'max(const long long int&)'
   28 |         printf("%lld\n",max(max(abs(a),abs(b)))*c,max((c),abs(d))*b);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/string:51,
                 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:3:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 1 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:4:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   template argument deduction/substitution failed:
a.cc:28:28: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   28 |         printf("%lld\n",max(max(abs(a),abs(b)))*c,max((c),abs(d))*b);
      |                         ~~~^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   candidate expects 2 arguments, 1 provided
Language: Java

import java.util.Scanner;
 
class Main{
 public static void main(String[] args){
   Scanner scanner = new Scanner(System.in);
   int a = scanner.nextInt();
   int b = scanner.nextInt();
   int c = scanner.nextInt();
   int d = scanner.nextInt();
   
   int[] a= new int[]{a*c,a*d,b*c,b*d};
   
   int num = a[0];
   
   for(int i=1;i<4;i++) if(num > a[i]) num = a[i];
   
   System.out.println(num);
   
 }
   
}

Compiler output:
Main.java:11: error: variable a is already defined in method main(String[])
   int[] a= new int[]{a*c,a*d,b*c,b*d};
         ^
Main.java:11: error: bad operand types for binary operator '*'
   int[] a= new int[]{a*c,a*d,b*c,b*d};
                       ^
  first type:  int[]
  second type: int
Main.java:11: error: bad operand types for binary operator '*'
   int[] a= new int[]{a*c,a*d,b*c,b*d};
                           ^
  first type:  int[]
  second type: int
3 errors
Language: C++

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

int main() {
  int a, b, c, d, e, f, g, h, i, j, k;
  cin >> a >> b >> c >> d;
  e=a*b;
  f=a*c;
  g=a*d;
  h=b*c;
  i=b*d;
  j=c*d;
k=max(max(max(max(max(max(j, i), h), g), f), e);
    cout << k << endl;
                }

Compiler output:
a.cc: In function 'int main()':
a.cc:13:48: error: expected ')' before ';' token
   13 | k=max(max(max(max(max(max(j, i), h), g), f), e);
      |      ~                                         ^
      |                                                )
Language: Java

import java.util.Scanner;
 
class Main{
 public static void main(String[] args){
   Scanner scanner = new Scanner(System.in);
   int a = scanner.nextInt();
   int b = scanner.nextInt();
   int c = scanner.nextInt();
   int d = scanner.nextInt();
   
   int[] e= new int[]{a*c,a*d,b*c,b*d};
   
   int num = e[0];
   
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
   
   System.out.println(num);
   
 }
   
}

Compiler output:
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
       ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
           ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
               ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
                               ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > e[i]) num = e[i];
                                           ^
  symbol:   variable i
  location: class Main
5 errors
Language: C++

#include<iostream>
using namespace std;
 
int main(){
	long long a,b,c,d,ans=INT_MIN;
    
  	cin>>a>>b>>c>>d;
  	
  	if(a*c>ans)ans = a*c;
  	if(a*d>ans)ans = a*d;
    if(b*c>ans)ans = b*c;
    if(b*d>ans)ans = b*d;
    cout<<ans;
  	
  	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:31: error: 'INT_MIN' was not declared in this scope
    5 |         long long a,b,c,d,ans=INT_MIN;
      |                               ^~~~~~~
a.cc:2:1: note: 'INT_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include<iostream>
  +++ |+#include <climits>
    2 | using namespace std;
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
  vector<long> a(4);
  for(long i=0;i<4;i++)
    cin>>a[i];
  sort(a.begin(),a.begin()+1,greater<long>);
  sort(a.begin()+2,a.end(),greater<long>);
  long c = a[0] * a[2];
  cout<<c;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<long> a(4);
      |   ^~~~~~
a.cc:3:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    2 | #include<algorithm>
  +++ |+#include <vector>
    3 | using namespace std;
a.cc:6:10: error: expected primary-expression before 'long'
    6 |   vector<long> a(4);
      |          ^~~~
a.cc:8:10: error: 'a' was not declared in this scope
    8 |     cin>>a[i];
      |          ^
a.cc:9:8: error: 'a' was not declared in this scope
    9 |   sort(a.begin(),a.begin()+1,greater<long>);
      |        ^
a.cc:9:43: error: expected primary-expression before ')' token
    9 |   sort(a.begin(),a.begin()+1,greater<long>);
      |                                           ^
a.cc:10:41: error: expected primary-expression before ')' token
   10 |   sort(a.begin()+2,a.end(),greater<long>);
      |                                         ^
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 main() {
  int i, N, K, x, count=0, ans=0;
  ll a, b, c, d, max1, max2;
  
  cin >> a >> b >> c >> d;
  
  max1 = a*c;
  if(a*d>max1) max1=a*d;
  else if(b*c>max1) max1=b*c;
  else if(b*d>max1) max1=b*d;
  
  if(a*b<=0){
    if(max1<0) max1=0;
    
  if(c*d<=0){
    if(max1<0) max1=0;
  
  cout << max1 << endl;
}

  
  


Compiler output:
a.cc: In function 'int main()':
a.cc:25:2: error: expected '}' at end of input
   25 | }
      |  ^
a.cc:18:13: note: to match this '{'
   18 |   if(a*b<=0){
      |             ^
a.cc:25:2: error: expected '}' at end of input
   25 | }
      |  ^
a.cc:7:12: note: to match this '{'
    7 | int main() {
      |            ^
Language: C++

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

int main()
{
    unsigned int min,max,in,buf;
    min=0,max=0;
 
    printf("\nEnter The Numbers or press Zero to exit....");
    do
    {
        scanf("%u",&in);
        if(in!=0)
        {
            if(in>=max)
            {
                max=in;
            }
            if(in<=buf)
            {
                min=in;
            }
            buf=in;
        }
        else
        {
            cout<<min*max;
            break;
        }
    }while(1);
    return 0;
}

Compiler output:
a.cc:2:10: fatal error: conio.h: No such file or directory
    2 | #include <conio.h>
      |          ^~~~~~~~~
compilation terminated.
Language: Java

import java.util.Scanner;
 
class Main{
 public static void main(String[] args){
   Scanner scanner = new Scanner(System.in);
   int a = scanner.nextInt();
   int b = scanner.nextInt();
   int c = scanner.nextInt();
   int d = scanner.nextInt();
   
   int[] a= new int[]{a*c,a*d,b*c,b*d};
   
   int num = a[0];
   
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
   
   System.out.println(num);
   
 }
   
}

Compiler output:
Main.java:11: error: variable a is already defined in method main(String[])
   int[] a= new int[]{a*c,a*d,b*c,b*d};
         ^
Main.java:11: error: bad operand types for binary operator '*'
   int[] a= new int[]{a*c,a*d,b*c,b*d};
                       ^
  first type:  int[]
  second type: int
Main.java:11: error: bad operand types for binary operator '*'
   int[] a= new int[]{a*c,a*d,b*c,b*d};
                           ^
  first type:  int[]
  second type: int
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
       ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
           ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
               ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
                               ^
  symbol:   variable i
  location: class Main
Main.java:15: error: cannot find symbol
   for(i=1;i<4;i++) if(num > a[i]) num = a[i];
                                           ^
  symbol:   variable i
  location: class Main
8 errors
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c,d,x,y,z,w,t;
  cin >> a >> b >> c >> d;
  x = a*c;
  y = b*c;
  z = a*d;
  w = b*d;
  t = max(max(x,y),max(z,w))
  cout << t << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:29: error: expected ';' before 'cout'
   10 |   t = max(max(x,y),max(z,w))
      |                             ^
      |                             ;
   11 |   cout << t << endl;
      |   ~~~~
Language: C++

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

int main() {
  int a, b, c, d, e, f, g, h, i, j, k;
  cin >> a >> b >> c >> d;
  e=a*b;
  f=a*c;
  g=a*d;
  h=b*c;
  i=b*d;
  j=c*d;
k=max(max(max(max(max(max(j, i), h), g), f), e)
    cout << k << endl;
                }

Compiler output:
a.cc: In function 'int main()':
a.cc:13:48: error: expected ')' before 'cout'
   13 | k=max(max(max(max(max(max(j, i), h), g), f), e)
      |      ~                                         ^
      |                                                )
   14 |     cout << k << endl;
      |     ~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c,d,x,y,z,w;
  cin >> a >> b >> c >> d;
  x = a*c;
  y = b*c;
  z = a*d;
  w = b*d;
  t = max(max(x,y),max(z,w))
  cout << t << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:10:3: error: 't' was not declared in this scope
   10 |   t = max(max(x,y),max(z,w))
      |   ^
Language: C++

#include <iostream>
using namespace std;
 
int main () {
  int a,b,c,d;
  
  cin >> a >> b >> c >> d;
  
  if (b <= 0 && d <= 0) {
    cout << a*c << endl;
  } else if (b <= 0 && c >= 0) {
    cout << b*c << endl;
  } else if (a >= 0 && d <= 0) {
    cout << a*d << endl;
  } else of (a >= 0 && c >= 0) {
    cout << b*d << endl;
  } else {
    cout << b*d << endl;
  }
}

Compiler output:
a.cc: In function 'int main()':
a.cc:15:10: error: 'of' was not declared in this scope
   15 |   } else of (a >= 0 && c >= 0) {
      |          ^~
a.cc:17:5: error: 'else' without a previous 'if'
   17 |   } else {
      |     ^~~~
Language: C++

#include <bits/stdc++.h>
using namespace std;
int main(){
  int a, b, c, d, x, y;
  cin >> a >> b >> c >> d;
  
  mx = a*c;
  mx = max(mx, a*d);
  mx = max(mx, b*c);
  mx = max(mx, b*d);
  
  cout << mx << endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:3: error: 'mx' was not declared in this scope; did you mean 'x'?
    7 |   mx = a*c;
      |   ^~
      |   x
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c,d;
  cin >> a >> b >> c >> d;
  x = a*c;
  y = b*c;
  z = a*d;
  w = b*d;
  t = max(max(x,y),max(z,w))
  cout << t << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'x' was not declared in this scope
    6 |   x = a*c;
      |   ^
a.cc:7:3: error: 'y' was not declared in this scope
    7 |   y = b*c;
      |   ^
a.cc:8:3: error: 'z' was not declared in this scope
    8 |   z = a*d;
      |   ^
a.cc:9:3: error: 'w' was not declared in this scope
    9 |   w = b*d;
      |   ^
a.cc:10:3: error: 't' was not declared in this scope
   10 |   t = max(max(x,y),max(z,w))
      |   ^
Language: C++

#include<iostream>
using namespace std;
int main(){
	long long int a, b, c, d;
	cin >> a >> b >> c >> d;
	long long int e[4];
	e[0] = a * c;
	e[1] = b * c;
	e[2] = a * d;
	e[3] = b * d;
	
	sort(e, e + 4);
	cout << e[3] << "\n";
	}


Compiler output:
a.cc: In function 'int main()':
a.cc:12:9: error: 'sort' was not declared in this scope; did you mean 'short'?
   12 |         sort(e, e + 4);
      |         ^~~~
      |         short
Language: C++

#include <iostream>
#include <climits>
#include <limits>

int main() {
  int a, b, c, d;
  std::cin >> a >> b >> c >> d;
  long long int m = LLONG_MIN;
  m = max(m, a*(long long)c);
  m = max(m, a*(long long)d);
  m = max(m, b*(long long)c);
  m = max(m, b*(long long)d);
  std::cout << m;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:7: error: 'max' was not declared in this scope; did you mean 'std::max'?
    9 |   m = max(m, a*(long long)c);
      |       ^~~
      |       std::max
In file included from /usr/include/c++/14/string:51,
                 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/stl_algobase.h:303:5: note: 'std::max' declared here
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
Language: C++

#include <bits/stdc++.h>
#include <math.h>
#include <cmath>
#define fio ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
using namespace std;
int main()
{
  fio;
  int a,b,c,d;
  cin>>a>>b>>c>>d;
  ll p1,p2,p3,p4;
  p1=a*c;
  p2=a*d;
  p3=b*d;
  p4=b*c;
  ll z;
  z=max(p1,p2);
  z=max(z,p3);
  z=max(z,p4);
  cout<<z<<endl;
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:11:3: error: 'll' was not declared in this scope
   11 |   ll p1,p2,p3,p4;
      |   ^~
a.cc:12:3: error: 'p1' was not declared in this scope; did you mean 'y1'?
   12 |   p1=a*c;
      |   ^~
      |   y1
a.cc:13:3: error: 'p2' was not declared in this scope
   13 |   p2=a*d;
      |   ^~
a.cc:14:3: error: 'p3' was not declared in this scope
   14 |   p3=b*d;
      |   ^~
a.cc:15:3: error: 'p4' was not declared in this scope
   15 |   p4=b*c;
      |   ^~
a.cc:16:5: error: expected ';' before 'z'
   16 |   ll z;
      |     ^~
      |     ;
a.cc:17:3: error: 'z' was not declared in this scope
   17 |   z=max(p1,p2);
      |   ^
Language: C

#include <stdio.h> 

int main() {
  int a, b, c, d;
  int ans1, ans2, ans;

  scanf("%d%d%d%d", &x, &y, &w, &z);

  int x1 = a * c;
  int x2 = a * d;
  int x3 = b * c;
  int x4 = b * d;

  if (x1 < x2) {
    ans1 = x2;
  } else {
    ans1 = x1;
  }

  if (x3 < x4) {
    ans2 = x4;
  } else {
    ans2 = x3;
  }

  if (ans1 < ans2) {
    ans = ans2;
  }  else {
    ans = ans1;
  }

  printf("%d", ans);

  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:7:22: error: 'x' undeclared (first use in this function)
    7 |   scanf("%d%d%d%d", &x, &y, &w, &z);
      |                      ^
main.c:7:22: note: each undeclared identifier is reported only once for each function it appears in
main.c:7:26: error: 'y' undeclared (first use in this function)
    7 |   scanf("%d%d%d%d", &x, &y, &w, &z);
      |                          ^
main.c:7:30: error: 'w' undeclared (first use in this function)
    7 |   scanf("%d%d%d%d", &x, &y, &w, &z);
      |                              ^
main.c:7:34: error: 'z' undeclared (first use in this function)
    7 |   scanf("%d%d%d%d", &x, &y, &w, &z);
      |                                  ^
Language: C++

#include <iostream>                                                                        |0 2 0 3
using namespace std;                                                                       |
int main() {                                                                               |
  long long ans = 0;                                                                       |
  long long a,b,c,d;                                                                       |
  cin >> a >> b >> c >> d;                                                                 |
  ans = a * c;                                                                             |
  ans = max(ans, a*d);                                                                     |
  ans = max(ans, b*c);                                                                     |
  ans = max(ans, b*d);                                                                     |
  cout << ans;                                                                             |
  return 0;                                                                                |
}                                                                                          |


Compiler output:
a.cc:1:92: warning: extra tokens at end of #include directive
    1 | #include <iostream>                                                                        |0 2 0 3
      |                                                                                            ^
a.cc:2:92: error: expected unqualified-id before '|' token
    2 | using namespace std;                                                                       |
      |                                                                                            ^
a.cc:13:92: error: expected unqualified-id before '|' token
   13 | }                                                                                          |
      |                                                                                            ^
Language: C++

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

int main() {
  ll a, b, c, d;
  cin >> a >> b >> c >> d;

  ll ans;
  if (b <= 0) {
    if (d <= 0) {
      ans = a * c;
    } else if (c <= 0) {
      ans = a * c;
    } else {
      ans = b * d
    }
  } else if (a <= 0) {
    if (d <= 0) {
      ans = a * c;
    } else if (c <= 0) {
      ans = max(a * c, b * d);
    } else {
      ans = b * d;
    }
  } else {
    if (d <= 0) {
      ans = a * d;
    } else if (c <= 0) {
      ans = b * d;
    } else {
      ans = b * d;
    }
  }

  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:16:18: error: expected ';' before '}' token
   16 |       ans = b * d
      |                  ^
      |                  ;
   17 |     }
      |     ~
Language: C++

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

int main() {
  int a, b, c, d, e, f, g, h, i, j;
  cin >> a >> b >> c >> d;
  e=a*b;
  f=a*c;
  g=a*d;
  h=b*c;
  i=b*d;
  j=c*d;


    cout << max(max(max(max(max(max(j, i), h), g), f), e) << endl;
                }

Compiler output:
a.cc: In function 'int main()':
a.cc:15:59: error: invalid operands of types 'const int' and '<unresolved overloaded function type>' to binary 'operator<<'
   15 |     cout << max(max(max(max(max(max(j, i), h), g), f), e) << endl;
      |                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
Language: C++

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

signed main()
{
  ll a,b,c,d;
  cin >> a >> b >> c >> d;
  cout << max({a*d,a*c,b*c,b*d}) << "\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'll' was not declared in this scope
    6 |   ll a,b,c,d;
      |   ^~
a.cc:7:10: error: 'a' was not declared in this scope
    7 |   cin >> a >> b >> c >> d;
      |          ^
a.cc:7:15: error: 'b' was not declared in this scope
    7 |   cin >> a >> b >> c >> d;
      |               ^
a.cc:7:20: error: 'c' was not declared in this scope
    7 |   cin >> a >> b >> c >> d;
      |                    ^
a.cc:7:25: error: 'd' was not declared in this scope
    7 |   cin >> a >> b >> c >> d;
      |                         ^
a.cc:8:14: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
    8 |   cout << max({a*d,a*c,b*c,b*d}) << "\n";
      |           ~~~^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 1 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 1 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   template argument deduction/substitution failed:
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   candidate expects 2 arguments, 1 provided
Language: C++

#include<iostream>
using namespace std;
int main()
{
  unsigned int a,b,c,d;
  cin>>a>>b>>c>>d;
  long unsigned int l,m,n,p;
  l=long unsigned int(a*c);
  m=long unsigned int(a*d);
  n=long unsigned int(b*c);
  p=long unsigned int(b*d);
  
  if(l>m && l>n && l>p)
    cout<<l;
  else if(m>l && m>n && m>p)
    cout<<m;
  else if(n>m && n>l && n>p)
    cout<<n;
  else
    cout<<p;
  return 0;
}
    
  
  
    

Compiler output:
a.cc: In function 'int main()':
a.cc:8:5: error: expected primary-expression before 'long'
    8 |   l=long unsigned int(a*c);
      |     ^~~~
a.cc:9:5: error: expected primary-expression before 'long'
    9 |   m=long unsigned int(a*d);
      |     ^~~~
a.cc:10:5: error: expected primary-expression before 'long'
   10 |   n=long unsigned int(b*c);
      |     ^~~~
a.cc:11:5: error: expected primary-expression before 'long'
   11 |   p=long unsigned int(b*d);
      |     ^~~~
Language: Java

import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    Long[] a=new Long[2];
    a[0]=sc.nextLong();
    a[1]=sc.nextLong();
    Long[] c=new Long[2];
    c[0]=sc.nextLong();
    c[1]=sc.nextLong();
    Long max=(Long)0;
    for(int i=0;i<2;i++){
      for(int j=0;j<2;j++){
        if(max<a[i]*c[j])max=a[i]*c[j];
      }
    }
    System.out.println(max);
  }
}

Compiler output:
Main.java:12: error: incompatible types: int cannot be converted to Long
    Long max=(Long)0;
                   ^
1 error
Language: C++

#include <bits/stdc++.h>

using namespace std;



int main(){

    int a, b, c, d;cin >> a >> b >> c >> d;
    cout << max(a*c,a*d,b*c,b*d) << endl;

}



Compiler output:
a.cc: In function 'int main()':
a.cc:10:16: error: no matching function for call to 'max(int, int, int, int)'
   10 |     cout << max(a*c,a*d,b*c,b*d) << endl;
      |             ~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 4 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 4 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 4 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   candidate expects 2 arguments, 4 provided
Language: C++

#include<iostream>
#include<algorithm>
using namespace std;
int main()
{
  vector<long> a(4);
  for(long i=0;i<4;i++)
    cin>>a[i];
  sort(a.begin(),a.begin()+1);
  sort(a.begin()+2,a.end());
  long c = a[0] * a[2];
  cout<<c;
  
 
 
  

Compiler output:
a.cc: In function 'int main()':
a.cc:6:3: error: 'vector' was not declared in this scope
    6 |   vector<long> a(4);
      |   ^~~~~~
a.cc:3:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    2 | #include<algorithm>
  +++ |+#include <vector>
    3 | using namespace std;
a.cc:6:10: error: expected primary-expression before 'long'
    6 |   vector<long> a(4);
      |          ^~~~
a.cc:8:10: error: 'a' was not declared in this scope
    8 |     cin>>a[i];
      |          ^
a.cc:9:8: error: 'a' was not declared in this scope
    9 |   sort(a.begin(),a.begin()+1);
      |        ^
a.cc:12:11: error: expected '}' at end of input
   12 |   cout<<c;
      |           ^
a.cc:5:1: note: to match this '{'
    5 | {
      | ^
Language: C++

int main(int argc, const char * argv[]) {
    
    ll a, b, c, d;
    cin >> a >> b >> c >> d;
    
    ll Ans = 0;
    if(b > 0 && d > 0) Ans = b * d;
    else if(b <= 0 && d > 0) Ans = b * c;
    else if(b > 0 && d <= 0) Ans = a * d;
    else Ans = a * c;
    
    cout << Ans << endl;
    
    return 0;
}

Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:3:5: error: 'll' was not declared in this scope
    3 |     ll a, b, c, d;
      |     ^~
a.cc:4:5: error: 'cin' was not declared in this scope
    4 |     cin >> a >> b >> c >> d;
      |     ^~~
a.cc:4:12: error: 'a' was not declared in this scope
    4 |     cin >> a >> b >> c >> d;
      |            ^
a.cc:4:17: error: 'b' was not declared in this scope
    4 |     cin >> a >> b >> c >> d;
      |                 ^
a.cc:4:22: error: 'c' was not declared in this scope
    4 |     cin >> a >> b >> c >> d;
      |                      ^
a.cc:4:27: error: 'd' was not declared in this scope
    4 |     cin >> a >> b >> c >> d;
      |                           ^
a.cc:6:7: error: expected ';' before 'Ans'
    6 |     ll Ans = 0;
      |       ^~~~
      |       ;
a.cc:7:24: error: 'Ans' was not declared in this scope
    7 |     if(b > 0 && d > 0) Ans = b * d;
      |                        ^~~
a.cc:8:30: error: 'Ans' was not declared in this scope
    8 |     else if(b <= 0 && d > 0) Ans = b * c;
      |                              ^~~
a.cc:9:30: error: 'Ans' was not declared in this scope
    9 |     else if(b > 0 && d <= 0) Ans = a * d;
      |                              ^~~
a.cc:10:10: error: 'Ans' was not declared in this scope
   10 |     else Ans = a * c;
      |          ^~~
a.cc:12:5: error: 'cout' was not declared in this scope
   12 |     cout << Ans << endl;
      |     ^~~~
a.cc:12:13: error: 'Ans' was not declared in this scope
   12 |     cout << Ans << endl;
      |             ^~~
a.cc:12:20: error: 'endl' was not declared in this scope
   12 |     cout << Ans << endl;
      |                    ^~~~
Language: Java

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);

		int a=s.nextInt();
      	int b=s.nextInt();
      	int c=s.nextInt();
      	int d=s.nextInt();
      	int p1=a*c;
      	int p2=a*d;
      	int p3=b*c;
      	int p4=b*d;

		int[] arr = new int[]{p1,p2,p3,p4};
      	int max;
      	for(int i=0;i<4;i++)
        {
          if(i==0)
          {
            max=arr[0];
          }
          else if(arr[i]>=max)
          {
            max=arr[i];
          }
        }
      	System.out.println(max+"");
	}
}


Compiler output:
Main.java:24: error: variable max might not have been initialized
          else if(arr[i]>=max)
                          ^
Main.java:29: error: variable max might not have been initialized
      	System.out.println(max+"");
      	                   ^
2 errors
Language: Java

import java.util.*;

class Main{
  public static void main(String[] args){
    Scanner sc=new Scanner(System.in);
    Long[] a=new Long[2];
    a[0]=sc.nextLong();
    a[1]=sc.nextLong();
    Long[] c=new Long[2];
    c[0]=sc.nextLong();
    c[1]=sc.nextLong();
    Long max=0;
    for(int i=0;i<2;i++){
      for(int j=0;j<2;j++){
        if(max<a[i]*c[j])max=a[i]*c[j];
      }
    }
    System.out.println(max);
  }
}

Compiler output:
Main.java:12: error: incompatible types: int cannot be converted to Long
    Long max=0;
             ^
1 error
Language: C++

#include <iostream>
#include <vector>
#include <set>
using namespace std;
int main() {
	long long a,b,c,d;
	cin>>a>>b>>c>>d;
	long long maxi=-INT_MIN;
	maxi=max(maxi,a*c);
	maxi=max(maxi,a*d);
	maxi=max(maxi,b*c);
	maxi=max(maxi,b*d);
	cout<<maxi;
	return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: 'INT_MIN' was not declared in this scope
    8 |         long long maxi=-INT_MIN;
      |                         ^~~~~~~
a.cc:4:1: note: 'INT_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    3 | #include <set>
  +++ |+#include <climits>
    4 | using namespace std;
Language: C++

#include <iostream>
using namespace std;
int main(void){
    // Your code here!
    long x1,x2,y1,y2;
    cin>>x1,x2,y1,y2;
    long answer=LONG_MIN;
    vector<vector<long>> vec={{x1,x2},{y1,y2}};
    for(int i=0;i<2;i++){
        for(int i=0;i<2;i++){
            if(vec[i]*vec[j]>answer){
                answer=vec[i]*vec[j]
            }
        }
    }
    cout<<answer;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: 'LONG_MIN' was not declared in this scope
    7 |     long answer=LONG_MIN;
      |                 ^~~~~~~~
a.cc:2:1: note: 'LONG_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include <iostream>
  +++ |+#include <climits>
    2 | using namespace std;
a.cc:8:5: error: 'vector' was not declared in this scope
    8 |     vector<vector<long>> vec={{x1,x2},{y1,y2}};
      |     ^~~~~~
a.cc:2:1: note: 'std::vector' is defined in header '<vector>'; this is probably fixable by adding '#include <vector>'
    1 | #include <iostream>
  +++ |+#include <vector>
    2 | using namespace std;
a.cc:8:19: error: expected primary-expression before 'long'
    8 |     vector<vector<long>> vec={{x1,x2},{y1,y2}};
      |                   ^~~~
a.cc:11:16: error: 'vec' was not declared in this scope
   11 |             if(vec[i]*vec[j]>answer){
      |                ^~~
a.cc:11:27: error: 'j' was not declared in this scope
   11 |             if(vec[i]*vec[j]>answer){
      |                           ^