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

#include<bits/stdc++.h>
using namespace std;
#define ll long long
int main(){
    ll a,b,c,d;
    cin>>a>>b>>c>>d;
    ll ans=INT_MIN;
    ans = max(a*c,max(a*d,max(b*c,b*d)))
    // for(ll i=min(a,b);i<=max(a,b);i++){
    //     for(ll j=min(c,d);j<=max(c,d);j++){
    //         ans=max(ans,i*j);
    //     }
    // }
    cout<<ans;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:41: error: expected ';' before 'cout'
    8 |     ans = max(a*c,max(a*d,max(b*c,b*d)))
      |                                         ^
      |                                         ;
......
   14 |     cout<<ans;
      |     ~~~~
Language: C

#include <stdio.h>
int main()
{
    int x,y;
    int z;
    int a,b,c,d;
    printf("enter those value: ");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if((a*c)>(a*d)){
        x=a;
        y=c;
        z=x*y;
        printf("%d",&z);
    }
    else
    {
        x=a;
        y=d;
        z=x*y;
        printf("%d",z);
        
    }
    if((b*c)>(b*d))
    {
        x=b;
        y=c;
        z=x*y;
        printf("%d",z);
    }
    else
    {
        x=b;
        y=d;
        z=x*y;
        printf("%d",z);
    }
    else if(x==y)
        printf("%d",z);
    return 0;
}



Compiler output:
main.c: In function 'main':
main.c:37:5: error: 'else' without a previous 'if'
   37 |     else if(x==y)
      |     ^~~~
Language: C++

 #include <iostream>
#include <stdlib.h>
using namespace std;

int main(){
  	long long a,b,c,d;
  	cin >> a >> b >> c >> d;
  	long long ans =  max({a*c,a*d,b*c,b*d});
  	cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:29: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
    8 |         long long ans =  max({a*c,a*d,b*c,b*d});
      |                          ~~~^~~~~~~~~~~~~~~~~~~
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:   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
Language: C++

 #include <iostream>
#include <stdlib.h>
using namespace std;

int main(){
  	long long 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:8:20: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
    8 |         cout << max({a*c,a*d,b*c,b*d}) << endl;
      |                 ~~~^~~~~~~~~~~~~~~~~~~
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:   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
Language: C

#include <stdio.h>
int main()
{
    int x,y;
    long int z;
    int a,b,c,d;
    printf("enter those value: ");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if((a*c)>(a*d)){
        x=a;
        y=c;
        z=x*y;
        printf("%ld",&z);
    }
    else
    {
        x=a;
        y=d;
        z=x*y;
        printf("%ld",z);
        
    }
    if((b*c)>(b*d))
    {
        x=b;
        y=c;
        z=x*y;
        printf("%ld",z);
    }
    else
    {
        x=b;
        y=d;
        z=x*y;
        printf("%ld",z);
    }
    else if(x==y)
        printf("%ld",z);
    return 0;
}



Compiler output:
main.c: In function 'main':
main.c:37:5: error: 'else' without a previous 'if'
   37 |     else if(x==y)
      |     ^~~~
Language: C

#include <stdio.h>
int main()
{
    int x,y;
    long long int z;
    int a,b,c,d;
    printf("enter those value: ");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if((a*c)>(a*d)){
        x=a;
        y=c;
        z=x*y;
        printf("%lld",&z);
    }
    else
    {
        x=a;
        y=d;
        z=x*y;
        printf("%lld",z);
        
    }
    if((b*c)>(b*d))
    {
        x=b;
        y=c;
        z=x*y;
        printf("%lld",z);
    }
    else
    {
        x=b;
        y=d;
        z=x*y;
        printf("%lld",z);
    }
    else if(x==y)
        printf("%lld",z);
        
}



Compiler output:
main.c: In function 'main':
main.c:37:5: error: 'else' without a previous 'if'
   37 |     else if(x==y)
      |     ^~~~
Language: C

#include <stdio.h>
int main()
{
    int x,y;
    long long int z;
    int a,b,c,d;
    printf("enter those value: ");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if((a*c)>(a*d)){
        x=a;
        y=c;
        z=x*y;
        printf("%lld",&z);
    }
    else
    {
        x=a;
        y=d;
        z=x*y;
        printf("%lld",z);
        
    }
    if((b*c)>(b*d))
    {
        x=b;
        y=c;
        z=x*y;
        printf("%lld",z);
    }
    else
    {
        x=b;
        y=d;
        z=x*y;
        printf("%lld",z);
    }
    else if(x=y)
        printf("%lld",z);
        
}



Compiler output:
main.c: In function 'main':
main.c:37:5: error: 'else' without a previous 'if'
   37 |     else if(x=y)
      |     ^~~~
Language: C

#include <stdio.h>
int main()
{
    int x,y;
    long long int z;
    int a,b,c,d;
    printf("enter those value: ");
    scanf("%d%d%d%d",&a,&b,&c,&d);
    if((a*c)>(a*d)){
        x=a;
        y=c;
        z=x*y;
        printf("%lld",&z);
    }
    else
    {
        x=a;
        y=d;
        z=x*y;
        printf("%lld",z);
        
    }
    if((b*c)>(b*d))
    {
        x=b;
        y=c;
        z=x*y;
        printf("%lld",z);
    }
    else
    {
        x=b;
        y=d;
        z=x*y;
        printf("%lld",z);
    }
    else if(x=y)
        printf("%lld",z)
        
}


Compiler output:
main.c: In function 'main':
main.c:37:5: error: 'else' without a previous 'if'
   37 |     else if(x=y)
      |     ^~~~
main.c:38:25: error: expected ';' before '}' token
   38 |         printf("%lld",z)
      |                         ^
      |                         ;
   39 | 
   40 | }
      | ~
Language: C

#include<stdio.h>
int main()
{
  int a,b,c,d,x,y;
  scanf("%d%d%d%d", &a,&b,&c,&d);
  x=a;
  y=c;
  cout<<x*y<<" ";
  x=b;
  y=d;
  cout<<x*y<<" ";
  return 0;
}

  

Compiler output:
main.c: In function 'main':
main.c:8:3: error: 'cout' undeclared (first use in this function)
    8 |   cout<<x*y<<" ";
      |   ^~~~
main.c:8:3: note: each undeclared identifier is reported only once for each function it appears in
Language: Java

import java.io.PrintWriter;
import java.util.Scanner;

public class B {

    void solve(Scanner in, PrintWriter out) {
        in.nextInt();
        int b = in.nextInt();
        in.nextInt();
        out.println(b * in.nextInt());
    }

    public static void main(String[] args) {
        try(Scanner in = new Scanner(System.in);
            PrintWriter out = new PrintWriter(System.out)) {
            new B().solve(in, out);
        }
    }
}


Compiler output:
Main.java:4: error: class B is public, should be declared in a file named B.java
public class B {
       ^
1 error
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long int a[2],b[2],ans=-1000000000000000000000;
  for(int i=0;i<2;i++)
    cin>>a[i];
    for(int i=0;i<2;i++)
    cin>>b[i];
 
  for(int i=0;i<2;i++)
  {
    for(int j=0;j<2;j++)
    {
      ans=max(ans,a[i]*b[j]);
    }
  }

  cout<<ans;
  return 0;


Compiler output:
a.cc:5:32: warning: integer constant is too large for its type
    5 |   long long int a[2],b[2],ans=-1000000000000000000000;
      |                                ^~~~~~~~~~~~~~~~~~~~~~
a.cc: In function 'int main()':
a.cc:20:12: error: expected '}' at end of input
   20 |   return 0;
      |            ^
a.cc:4:1: note: to match this '{'
    4 | {
      | ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long int a,b,c,d,prod1.prod2,prod3,prod4;
  cin>>a>>b>>c>>d;
  prod1=a*c;
  prod2=a*d;
  prod3=b*c;
  prod4=b*d;
  vector<long long int> A;
  A.push_back(prod1);
  A.push_back(prod2);
  A.push_back(prod3);
  A.push_back(prod4);
  long long max=prod1;
  for(int i=0;i<4;i++)
  {
    if(max<A[i])
      max=A[i];
  }
  cout<<max;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:30: error: expected initializer before '.' token
    5 |   long long int a,b,c,d,prod1.prod2,prod3,prod4;
      |                              ^
a.cc:7:3: error: 'prod1' was not declared in this scope
    7 |   prod1=a*c;
      |   ^~~~~
a.cc:8:3: error: 'prod2' was not declared in this scope
    8 |   prod2=a*d;
      |   ^~~~~
a.cc:9:3: error: 'prod3' was not declared in this scope
    9 |   prod3=b*c;
      |   ^~~~~
a.cc:10:3: error: 'prod4' was not declared in this scope
   10 |   prod4=b*d;
      |   ^~~~~
Language: C

/*BISMILLAH*/
/*Coded by Sheikh Fahad Shaon*/
#include<bits/stdc++.h>
using namespace std;

#define ll long long int
#define scl(a) scanf("%lld",&a)
#define scll(a,b) scanf("%lld %lld",&a,&b)
#define scf(a) scanf("%lf",&a)
#define sci(a) scanf("%d",&a)
#define scii(a,b) scanf("%d %d",&a,&b)
#define pri(a) printf("%d\n",a)
#define prii(a,b) printf("%d %d\n",a,b)
#define scff(a,b) scanf("%lf %lf",&a,&b)
#define prf(a) printf("%lf",a)
#define prff(a,b) printf("%lf %lf\n",a,b);
#define prl(a) printf("%lld\n",a)
#define prll(a,b) printf("%lld %lld\n",a,b)
#define pb push_back
#define mp make_pair
#define scs(a) scanf("%s",a)
#define prs(a) printf("%s\n",s);
#define test int t;scanf("%d",&t);while(t--)
#define fastio ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
#define line(s) getline(cin,s)

void solve()
{
	ll a, b, c, d, m = 0;
	cin >> a >> b >> c >> d;
	m = max(a * c, m);
	m = max(m, a * d);
	m = max(m, b * c);
	m = max(m, b * d);
	cout << m << "\n";
}

int main()
{
	fastio
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
#endif
	solve();
}


Compiler output:
main.c:3:9: fatal error: bits/stdc++.h: No such file or directory
    3 | #include<bits/stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
Language: C++

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

// find_by_order(k) returns the iterator to the kth largest element (start from 0)
// order_of_key(k) returns the number of elements in the set which are strictly less than the value k

using namespace std;
using namespace __gnu_pbds;

#define ff              first
#define ss              second
#define int             long long
#define pb              push_back
#define pii             pair<int,int>
#define vi              vector<int>
#define mii             map<int,int>
#define pqb             priority_queue<int>
#define pqs             priority_queue<int,vi,greater<int> >
#define setbits(x)      __builtin_popcountll(x)
#define rightmostbit(x) __builtin_ffsll(x)
#define mod             1000000007
#define inf             1e18
#define ps(x,y)         cout << fixed; cout << setprecision(x); cout << y;
#define pi              3.141592653589793238
#define mk(a,n)         int n;cin>>n;vi a(n);for(int i=0;i<n;i++) cin>>a[i]
#define w(x)            int x; cin>>x; while(x--)
#define error(args...) { string _s = #args; replace(_s.begin(), _s.end(), ',', ' '); stringstream _ss(_s); istream_iterator<string> _it(_ss); err(_it, args); }

void err(istream_iterator<string> it) {}
template<typename T, typename... Args>
void err(istream_iterator<string> it, T a, Args... args) {
	cerr << *it << " = " << a << endl;
	err(++it, args...);
}

int dx[] = { -1, 0, 1, 0};
int dy[] = {0, 1, 0, -1};
int dx2[] = { -1 , -1 , -1, 0 , 0 , 1 , 1 , 1};
int dy2[] = { -1 , 0 , 1 , -1, 1 , -1, 0, 1};

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> pbds;

void g_b()
{
	ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#ifndef ONLINE_JUDGE
	freopen("input.txt", "r", stdin);
	freopen("output.txt", "w", stdout);
	freopen("error.txt", "w", stderr);
#endif
}
// 1, 1, 2, 5, 14, 42, 132, 429, 1430, CATALAN NUMBER
int32_t main()
{
	g_b();
	int ans = a*c;
	int a, b, c, d; cin >> a >> b >> c >> d;
	if (a <= 0 and c <= 0) ans =max(ans ,a * c);
	if (b >= 0 && d >= 0) ans = max(ans, b * d);
	ans = max(ans, b * c), ans = max(ans, a * d);
	cout << ans;

	return 0;
}


Compiler output:
a.cc: In function 'int32_t main()':
a.cc:57:19: error: 'a' was not declared in this scope
   57 |         int ans = a*c;
      |                   ^
a.cc:57:21: error: 'c' was not declared in this scope
   57 |         int ans = a*c;
      |                     ^
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define int long long int
#define INF 1e5
#define MoD 1e9 + 7
#define all(c) c.begin(), c.end()
#define sz(x) (int)(x).size()

int32_t main() {
	ios::sync_with_stdio(0);
	cin.tie(0);

	int a, b, c, d;
  	cin >> a >> b>> c>> d;
  cout << max(max(a*c, b*d), max(a*d, b*c)))<<'\n';
  return 0;

}


Compiler output:
a.cc: In function 'int32_t main()':
a.cc:17:44: error: expected ';' before ')' token
   17 |   cout << max(max(a*c, b*d), max(a*d, b*c)))<<'\n';
      |                                            ^
      |                                            ;
Language: C++

#include <bits/stdc++.h>

using namespace std;

#define ll long long int
#define INF 1e5
#define MoD 1e9 + 7
#define all(c) c.begin(), c.end()
#define sz(x) (int)(x).size()

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

	ll a, b, c, d;
  	cin >> a >> b>> c>> d;
  cout << max(max(a*c, b*d), max(a*d, b*c)))<<'\n';
  return 0;

}


Compiler output:
a.cc: In function 'int main()':
a.cc:17:44: error: expected ';' before ')' token
   17 |   cout << max(max(a*c, b*d), max(a*d, b*c)))<<'\n';
      |                                            ^
      |                                            ;
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
long long a,b,c,d;
cin>>a>>b>>c>>d;
long long c1=max(a*c,a*d,b*c,b*d);
cout<<c1<<"\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: no matching function for call to 'max(long long int, long long int, long long int, long long int)'
    7 | long long c1=max(a*c,a*d,b*c,b*d);
      |              ~~~^~~~~~~~~~~~~~~~~
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<bits/stdc++.h>
#define ll long long
using namespace std;
int main() {
	ll a, b, c, d;
	cin >> a >> b >> c >> d;
	int mx = INT_MIN;
	mx = mx(mx, a * c);
	mx = mx(mx, a * d);
	mx = mx(mx, b * c);
	mx = mx(mx, b * d);
	cout << mx << endl;
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:16: error: 'mx' cannot be used as a function
    8 |         mx = mx(mx, a * c);
      |              ~~^~~~~~~~~~~
a.cc:9:16: error: 'mx' cannot be used as a function
    9 |         mx = mx(mx, a * d);
      |              ~~^~~~~~~~~~~
a.cc:10:16: error: 'mx' cannot be used as a function
   10 |         mx = mx(mx, b * c);
      |              ~~^~~~~~~~~~~
a.cc:11:16: error: 'mx' cannot be used as a function
   11 |         mx = mx(mx, b * d);
      |              ~~^~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long a,b,c,d;
  cin>>a>>b>>c>>d;
  long long max=INT_MIN;
  long long c1;
  c1=a*c;
  if(c1>max)
  {
    max=c1
  }
  c1=a*d;
  if(c1>max)
  {
    max=c1;
  }
  c1=b*c;
  if(c1>max)
  {
    max=c1;
  }
  c1=b*d;
  if(c1>max)
  {
    max=c1;
  }
  cout<<max<<"\n";
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:11: error: expected ';' before '}' token
   12 |     max=c1
      |           ^
      |           ;
   13 |   }
      |   ~
Language: C++

#include<iostream>
using namespace std;
int main()
{
  long long a,b,c,d;
  cin>>a>>b>>c>>d;
  long long max=INT_MIN;
  long long c1;
  c1=a*c;
  if(c1>max)
  {
    max=c1
  }
  c1=a*d;
  if(c1>max)
  {
    max=c1;
  }
  c1=b*c;
  if(c1>max)
  {
    max=c1;
  }
  c1=b*d;
  if(c1>max)
  {
    max=c1;
  }
  cout<<max<<"\n";
}
    

Compiler output:
a.cc: In function 'int main()':
a.cc:7:17: error: 'INT_MIN' was not declared in this scope
    7 |   long long max=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;
a.cc:12:11: error: expected ';' before '}' token
   12 |     max=c1
      |           ^
      |           ;
   13 |   }
      |   ~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  int a,b,c,d;
  cin>>a>>b>>c>>d;
cout<<max(max(ad,bd),max(ac,bc));
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:15: error: 'ad' was not declared in this scope; did you mean 'd'?
    6 | cout<<max(max(ad,bd),max(ac,bc));
      |               ^~
      |               d
a.cc:6:18: error: 'bd' was not declared in this scope; did you mean 'd'?
    6 | cout<<max(max(ad,bd),max(ac,bc));
      |                  ^~
      |                  d
a.cc:6:26: error: 'ac' was not declared in this scope; did you mean 'c'?
    6 | cout<<max(max(ad,bd),max(ac,bc));
      |                          ^~
      |                          c
a.cc:6:29: error: 'bc' was not declared in this scope; did you mean 'c'?
    6 | cout<<max(max(ad,bd),max(ac,bc));
      |                             ^~
      |                             c
Language: C++

#include<stdio.h>
int main()
{
  long long int a,b,c,d;
  scanf("%lld %lld %lld %lld",&a,&b,&c,&d);
  if((b>0&&d>0))
  {
    printf("%lld",b*d);
  }else if(b<0&&d>0)
  {
    if(c){
    printf("%lld",b*c);
    }else{
      printf("%lld",b*(c+1))
    }
  }else if(b>0&&d<0)
  {
    if(a<0){
    printf("%lld",a*d);
    }else{
      printf("%lld",(1)*d);
    }
  }else{
    printf("%lld",a*c);
  }
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:29: error: expected ';' before '}' token
   14 |       printf("%lld",b*(c+1))
      |                             ^
      |                             ;
   15 |     }
      |     ~
Language: C++

#include <iostream>
#include <vector>
#include <algorithm>
#include <string>
#include <ctype.h>
#include <cstdlib>
#include <cmath>
#include <stack>
#define _GLIBCXX_DEBUG
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:16:45: error: invalid operands of types 'long long int' and '<unresolved overloaded function type>' to binary 'operator<<'
   16 |     cout << max(max(max(a*c,a*d), b*c), b*d << endl;
      |                                         ~~~~^~~~~~~
Language: C++

#include <bits/stdc++.h>

using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:47: error: no matching function for call to 'max(long long int)'
    8 |         cout << max(a*c, max(a*d, max(b*c, max(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, 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:8:47: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
    8 |         cout << max(a*c, max(a*d, max(b*c, max(b*d)))) << 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;
long long main() {
    long long a, b, c, d;
    cin >> a >> b >> c >> d;

    long long X;
    long long Y;

    if (a < 0 && b < 0 && c < 0 && d < 0) {
        X = a;
        Y = c;
    }
    else if (a < 0 && 0 <= b && c < 0 && 0 <= d && a * c>b * d) {
        X = a;
        Y = c;
    }
    else if (a < 0 && 0 <= b && c < 0 && 0 <= d && a * c < b * d) {
        X = b;
        Y = d;
    }
    else if (0 <= a && 0 <= b && c < 0 && d < 0) {
        X = a;
        Y = d;
    }
    else if (a < 0 && b < 0 && 0 <= c && 0 <= d) {
        X = b;
        Y = c;
    }
    else {
        X = b;
        Y = d;

    }



    cout << X * Y;
}

Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

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

    int X;
    int Y;

    if (a < 0 && b < 0 && c < 0 && d < 0) {
        X = a;
        Y = c;
    }
    else if (a < 0 && 0 <= b && c < 0 && 0 <= d && a * c>b * d) {
        X = a;
        Y = c;
    }
    else if (a < 0 && 0 <= b && c < 0 && 0 <= d && a * c < b * d) {
        X = b;
        Y = d;
    }
    else if (0 <= a && 0 <= b && c < 0 && d < 0) {
        X = a;
        Y = d;
    }
    else if (a < 0 && b < 0 && 0 <= c && 0 <= d) {
        X = b;
        Y = c;
    }
    else {
        X = b;
        Y = d;

    }



    cout << X * Y;
}

Compiler output:
cc1plus: error: '::main' must return 'int'
Language: C++

//AUTHOR:- Avinash//
//#include <bits/stdc++.h>
#include <iostream>
using namespace std;
#define ll long long int
#define lll long long
#define fo(i,n) for(int i=0;i<n;i++)
#define take(a,i,n) for(int i=0;i<n;i++) cin>>a[i]
#define FAST ios_base::sync_with_stdio(false);cin.tie(NULL);
#define ld long long double
#define d1(x) cout<<(x)<<endl
#define T int t;cin>>t;while(t--)
#define hell 1000000007
#define ex endl;
#define F first
#define maxn 200001
#define pi 3.14159265
#define S second
#define P pair<int,int>
#define PP pair<int,pair<int,int>>
#define pb push_back
#define in insert
#define vec vector<ll>
#define vec2 vector<vector<int>>
#define s(a,n) sort(a,a+n);
#define sv(a) sort(a.begin(),a.end());
#define MAX 1000
//Author:-Avinash//

ll power(ll x, ll y, ll m)
{
    if (y == 0)
        return 1;
    ll p = power(x, y/2, m) % m;
    p = (p * p) % m;
    return (y%2 == 0)? p : (x * p) % m;
}
ll sum_of_natural_no(ll n )
{
    return (n *(n+1))/2;
}

ll modInverse(ll a, ll m)
{
    return power(a, m-2, m);
}
int main(){
   FAST
   ll a,b,c,d;
   cin>>a>>b>>c>>d;
   int ans = -1e18;
   ans = max({ans,a*c,a*d,b*c,b*d});
   cout<<ans<<endl;
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:51:14: warning: overflow in conversion from 'double' to 'int' changes value from '-1.0e+18' to '-2147483648' [-Woverflow]
   51 |    int ans = -1e18;
      |              ^~~~~
a.cc:52:13: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
   52 |    ans = max({ans,a*c,a*d,b*c,b*d});
      |          ~~~^~~~~~~~~~~~~~~~~~~~~~~
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
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: 'C' was not declared in this scope
    6 |   cin>>a>>b>>C>>d;
      |              ^
a.cc:7:10: error: 'LONG_MIN' was not declared in this scope
    7 |   ll ans=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 | #define ll long long
Language: C++

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

int main(){
int x,y,i,j;
int max
  cin>>a>>b>>c>>d;

  
 double all[abs(b-a+1)][abs(d-c+1)]
  if(a>b){
  x=b-1;
    if(c>d){
      y=d-1
    }
    if(d>c){
    y=c-1
    }
    for(i=0;i<=abs(b-a+1);i++){
      y++;
    for(j=0;j<=abs(d-c+1);j++){
    all[i][j]=x*y;
      x++;
    }
    }
  }
  
  if(b>a){
  x=a-1;
     if(c>d){
      y=d-1
    }
    if(d>c){
    y=c-1
    }
    for(i=0;i<=abs(b-a+1);i++){
      y++;
    for(j=0;j<=abs(d-c+1);j++){
    all[i][j]=x*y;
      x++;
    }
    }
  }
  
  max=all[0][0];
  
  for(i=0;i<=abs(b-a+1);i++){
  for(j=0;j<=abs(d-c+1);j++){
  if(max>all[i][j]){
  max=all[i][j]
  }
  }
  }
 
  cout<<"<<"max"<<";
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:3: error: expected initializer before 'cin'
    8 |   cin>>a>>b>>c>>d;
      |   ^~~
a.cc:11:17: error: 'b' was not declared in this scope
   11 |  double all[abs(b-a+1)][abs(d-c+1)]
      |                 ^
a.cc:11:19: error: 'a' was not declared in this scope
   11 |  double all[abs(b-a+1)][abs(d-c+1)]
      |                   ^
a.cc:11:29: error: 'd' was not declared in this scope
   11 |  double all[abs(b-a+1)][abs(d-c+1)]
      |                             ^
a.cc:11:31: error: 'c' was not declared in this scope
   11 |  double all[abs(b-a+1)][abs(d-c+1)]
      |                               ^
a.cc:12:3: error: expected initializer before 'if'
   12 |   if(a>b){
      |   ^~
a.cc:40:5: error: 'all' was not declared in this scope; did you mean 'atoll'?
   40 |     all[i][j]=x*y;
      |     ^~~
      |     atoll
a.cc:46:7: error: 'all' was not declared in this scope; did you mean 'atoll'?
   46 |   max=all[0][0];
      |       ^~~
      |       atoll
a.cc:56:16: error: unable to find string literal operator 'operator""max' with 'const char [5]', 'long unsigned int' arguments
   56 |   cout<<"<<"max"<<";
      |                ^~~~
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: 'C' was not declared in this scope
    6 |   cin>>a>>b>>C>>d;
      |              ^
a.cc:7:10: error: 'LLONG_MIN' was not declared in this scope
    7 |   ll ans=LLONG_MIN;
      |          ^~~~~~~~~
a.cc:2:1: note: 'LLONG_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include<iostream>
  +++ |+#include <climits>
    2 | #define ll long long
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: 'C' was not declared in this scope
    6 |   cin>>a>>b>>C>>d;
      |              ^
a.cc:7:18: error: 'LLONG_MIN' was not declared in this scope
    7 |   ll ans=max(b*d,LLONG_MIN);
      |                  ^~~~~~~~~
a.cc:2:1: note: 'LLONG_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include<iostream>
  +++ |+#include <climits>
    2 | #define ll long long
Language: C++

// AtCoder178.cpp : このファイルには 'main' 関数が含まれています。プログラム実行の開始と終了がそこで行われます。
//

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int main()
{
    //string s;
    //cin >> s;

    //int i = atoi(s.c_str());
    //if (i == 0) {
    //    cout << 1;
    //}
    //else {
    //    cout << 0;
    //}

    long long a, b, c, d;
    cin >> a >> b >> c >> d;
#ifdef 0    
    if (a >= 0) {
        if (c >= 0) {
            cout << b * d;
        }
        if (d<0){
            cout << 0;
        }
    }
    else if (b >= 0) {
        if (c >= 0) {
            cout << b * d;
        }
        else if (d >= 0) {
            cout << max(a * c, b * d);
        }
        if (d < 0) {
            cout << a*c;
        }

    }
    else  { /* (b < 0)*/ //xは絶対負
        if (c >= 0) {
            cout << 0;
        }
        if (d < 0) {
            cout << a*c;
        }
    }
#else

    cout << max(max(a * c, a * d), max(b * c, b * d));
#endif
    //cout << ans;


    return 0;
}



Compiler output:
a.cc:23:8: error: macro names must be identifiers
   23 | #ifdef 0
      |        ^
Language: C++

#include<iostream>
#define ll long long
using namespace std;
int main(){
ll a,b,c,d;
  cin>>a>>b>>C>>d;
  ll ans=max(b*d,LLONG_MIN);
  ans=max(ans,a*c);
  ans=max(ans,a*d);
  ans=max(ans,b*c);
  cout<<ans;
reutrn 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:6:14: error: 'C' was not declared in this scope
    6 |   cin>>a>>b>>C>>d;
      |              ^
a.cc:7:18: error: 'LLONG_MIN' was not declared in this scope
    7 |   ll ans=max(b*d,LLONG_MIN);
      |                  ^~~~~~~~~
a.cc:2:1: note: 'LLONG_MIN' is defined in header '<climits>'; this is probably fixable by adding '#include <climits>'
    1 | #include<iostream>
  +++ |+#include <climits>
    2 | #define ll long long
a.cc:12:1: error: 'reutrn' was not declared in this scope
   12 | reutrn 0;
      | ^~~~~~
Language: C++

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

typedef long long int lli;


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

	lli maxi = 1e-18;
	
	if(b > 0 && c > 0)
		cout << b * c;
	else if(c < 0 || b < 0)
	{
		if(c < 0)
		{
			cout << b * d;
		}
		else
			cout << a * d;
	}
	else
	{
		if( b == 0)
			cout << a * d;
		else if ( d == 0)
			cout << b * c;
		else if( b == 0 && d == 0)
			cout << a * c;

	}
	else 
		cout << 0;
	return 0;
}





Compiler output:
a.cc: In function 'int main()':
a.cc:35:9: error: 'else' without a previous 'if'
   35 |         else
      |         ^~~~
Language: C++

#include<bits/stdc++.h>
#include<atcoder/all>
using namespace std;
#define fs first
#define sc second
#define pb push_back
#define mp make_pair
#define eb emplace_back
#define ALL(A) A.begin(),A.end()
#define RALL(A) A.rbegin(),A.rend()
typedef long long ll;
typedef pair<ll,ll> P;
template<class T> inline bool chmax(T& a, T b) { if (a < b) { a = b; return 1; } return 0; }
template<class T> inline bool chmin(T& a, T b) { if (a > b) { a = b; return 1; } return 0; }
template<typename T> T gcd(T a,T b){return b?gcd(b,a%b):a;}
const ll MOD=1000000007;
const ll LINF=1ll<<60;
const int INF=1<<30;
int dx[]={1,0,-1,0,1,-1,1,-1};
int dy[]={0,1,0,-1,1,-1,-1,1};


int main(){
    ll a, b, c, d;cin >> a >> b >> c >> d;
    cout << max({a * c, b * d, a * d, b * c}) << endl;
    return 0;
}


Compiler output:
a.cc:2:9: fatal error: atcoder/all: No such file or directory
    2 | #include<atcoder/all>
      |         ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <iostream>
using namespace std;
int main() {
    int a, b, c, d;
    cin >> a >> b >> c >> d;
    
    if(max(abs(a), abs(b))=abs(a)) {
    int x = a;
    cin >> x;
    }
    
    if(max(abs(a), abs(b))=abs(b)) {
    int x = b;
    cin >> x;
    }
    
    if(max(abs(c), abs(d))=abs(c)) {
    int x = c;
    cin >> y;
    }
    
    if(max(abs(c), abs(d))=abs(d)) {
    int x = d;
    cin >> y;
    }
    
    cout << x * y << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:27: error: assignment of read-only location 'std::max<int>(abs(a), abs(b))'
    7 |     if(max(abs(a), abs(b))=abs(a)) {
      |        ~~~~~~~~~~~~~~~~~~~^~~~~~~
a.cc:12:27: error: assignment of read-only location 'std::max<int>(abs(a), abs(b))'
   12 |     if(max(abs(a), abs(b))=abs(b)) {
      |        ~~~~~~~~~~~~~~~~~~~^~~~~~~
a.cc:17:27: error: assignment of read-only location 'std::max<int>(abs(c), abs(d))'
   17 |     if(max(abs(c), abs(d))=abs(c)) {
      |        ~~~~~~~~~~~~~~~~~~~^~~~~~~
a.cc:19:12: error: 'y' was not declared in this scope
   19 |     cin >> y;
      |            ^
a.cc:22:27: error: assignment of read-only location 'std::max<int>(abs(c), abs(d))'
   22 |     if(max(abs(c), abs(d))=abs(d)) {
      |        ~~~~~~~~~~~~~~~~~~~^~~~~~~
a.cc:24:12: error: 'y' was not declared in this scope
   24 |     cin >> y;
      |            ^
a.cc:27:13: error: 'x' was not declared in this scope
   27 |     cout << x * y << endl;
      |             ^
a.cc:27:17: error: 'y' was not declared in this scope
   27 |     cout << x * y << endl;
      |                 ^
Language: C

#include <stdio.h>
#include<limits.h>
int main(void){
  long long int a;
   long long int b;
    long long int c;
   long long int d;
  
  scanf("%lld",&a);
    scanf("%lld",&b);
    scanf("%lld",&c);
    scanf("%lld",&d);
  
    if(a>=0&&c>=0){
        printf("%lld",b*d);
    }
    else if(b<=0&&c>=0){
        printf("%lld",b*c);
        
    }
    else if(d<=0&&a>=0){
        printf("%lld",a*d);
    }
        else if(b<=0&&d<=0){
      printf("%lld",a*c);
  }
   
  
  
  
}
  
  
  
  
}

Compiler output:
main.c:36:1: error: expected identifier or '(' before '}' token
   36 | }
      | ^
Language: Java

        import java.util.*;
        class Main{
          public static void main(String[] args){
            Scanner sc = new Scanner(System.in);
            int a = sc.nextInt();
            int b = sc.nextInt();
            int c = sc.nextInt();
            int d = sc.nextInt();
            
            long x = a * c;
            long y = a * d;
            long z = b * c;
            long w = b * d;
            long[] aa = new long[4];
            
            aa[0] = x;
            aa[1] = y;
            aa[2] = z;
            aa[3] = w;
            int max = x;
         
            for(int i = 0; i < 4; i++){
              if(aa[i] > max){
                max = aa[i];
              }
            }
            System.out.println(max);
          }
        }

Compiler output:
Main.java:20: error: incompatible types: possible lossy conversion from long to int
            int max = x;
                      ^
Main.java:24: error: incompatible types: possible lossy conversion from long to int
                max = aa[i];
                        ^
2 errors
Language: C++

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

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

  
   return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:12: warning: empty parentheses were disambiguated as a function declaration [-Wvexing-parse]
   10 | signed main()
      |            ^~
a.cc:10:12: note: remove parentheses to default-initialize a variable
   10 | signed main()
      |            ^~
      |            --
a.cc:10:12: note: or replace parentheses with braces to value-initialize a variable
a.cc:11:1: error: a function-definition is not allowed here before '{' token
   11 | {
      | ^
Language: Java

        import java.util.*;
        class Main{
          public static void main(String[] args){
            Scanner sc = new Scanner(System.in);
            int a = sc.nextInt();
            int b = sc.nextInt();
            int c = sc.nextInt();
            int d = sc.nextInt();
            
            long x = a * c;
            long y = a * d;
            long z = b * c;
            long w = b * d;
            int[] aa = new int[4];
            
            aa[0] = x;
            aa[1] = y;
            aa[2] = z;
            aa[3] = w;
            int max = x;
         
            for(int i = 0; i < 4; i++){
              if(aa[i] > max){
                max = aa[i];
              }
            }
            System.out.println(max);
          }
        }

Compiler output:
Main.java:16: error: incompatible types: possible lossy conversion from long to int
            aa[0] = x;
                    ^
Main.java:17: error: incompatible types: possible lossy conversion from long to int
            aa[1] = y;
                    ^
Main.java:18: error: incompatible types: possible lossy conversion from long to int
            aa[2] = z;
                    ^
Main.java:19: error: incompatible types: possible lossy conversion from long to int
            aa[3] = w;
                    ^
Main.java:20: error: incompatible types: possible lossy conversion from long to int
            int max = x;
                      ^
5 errors
Language: C++

#include <iostream>

using namespace std;
int main(){
	int a, b, c, d;
	cin >> a >> b >> c >> d;
	long long long x, y;
	if ((b >= 1) && (d >= 1)){
		x = b;
		y = d;
		cout << x * y << endl;
	} else if ((b <= 0) && (d >= 1)){
		x = b;
		y = c;
		cout << x * y << endl;
	} else if ((d <= 0) && (b >= 1)){
		x = a;
		y = d;
		cout << x * y << endl;
	} else {
		x = a;
		y = c;
		cout << x * y << endl; 
	}
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:19: error: 'long long long' is too long for GCC
    7 |         long long long x, y;
      |                   ^~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long int a,b,c,d;
  cin >> a >> b >> c >> d;
  long long int ans;
  ans = a*c;
  ans = max(ans,a*d);
  ans = max(ans,b*c);
  ans = max(ans,b*d);
  cout << ans << endl;
  return0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:13:3: error: 'return0' was not declared in this scope
   13 |   return0;
      |   ^~~~~~~
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: expected primary-expression before ')' token
    9 |   else if(b<=0 || d<=) cout << a*c << endl;
      |                      ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:22: error: expected primary-expression before ')' token
    9 |   else if(b<=0 || d<=) cout << a*c << endl+;
      |                      ^
a.cc:9:44: error: expected primary-expression before ';' token
    9 |   else if(b<=0 || d<=) cout << a*c << endl+;
      |                                            ^
Language: C++

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:18:31: error: expected primary-expression before '>=' token
   18 |      }else if(a<0&&b>=0&&c<0&&>=d>=0){
      |                               ^~
Language: C++

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

int main() {
  int a;
  int b;
  int c;
  int d;
  cin>>a>>b>>c>>d;
  if(a<0&&b<0&&c<0&&d<0){
    cout<<a*c<<endl;
  }else if(a<0&&b<0&&c<0&&d>=0){
    cout<<a*c<<endl;
  }else if(a<0&&b<0&&c>=0&&d>=0){
    cout<<b*c<<endl;
     }else if(a<0&&b>=0&&c<0&&d<0){
    cout<<a*c<<endl;
     }else if(a<0&&b>=0&&c<0&&>=d0){
    if(a*c>b*d){
      cout<<a*c<<endl;
    }else{
      cout<<b*d<<endl;
    }
     }else if(a<0&&b>=0&&c>=0&&d>=0){
    cout<<b*d<<endl;
     }else if(a>=0&&b>=0&&c<0&&d<0){
    cout<<a*d<<endl;
     }else if(a>=0&&b>=0&&c<0&&d>=0){
    cout<<b*d<<endl;
  }else{
    cout<<b*d<<endl;
  }
  
  
}


Compiler output:
a.cc: In function 'int main()':
a.cc:18:31: error: expected primary-expression before '>=' token
   18 |      }else if(a<0&&b>=0&&c<0&&>=d0){
      |                               ^~
a.cc:18:33: error: 'd0' was not declared in this scope; did you mean 'd'?
   18 |      }else if(a<0&&b>=0&&c<0&&>=d0){
      |                                 ^~
      |                                 d
Language: C++

#include <iostream>

using namespace std;

int main() {
  
  long long a, b, c, d;
  cin >> a >> b >> c >> d;
  
  cout << max({a * c, a * d, b * c, b * d});
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
   10 |   cout << max({a * c, a * d, b * c, b * d});
      |           ~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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:   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
Language: C++

/******************************************************************************

                              Online C++ Compiler.
               Code, Compile, Run and Debug C++ program online.
Write your code in this editor and press "Run" button to compile and execute it.

*******************************************************************************/

#include <bits/stdc++.h>

using namespace std;

int main()
{

long a,b,c,d;
    cin>>a>>b>>c>>d;
    
 long long int ans;
   if(a>0 && b>0 && c>0 && d>0)
   {
       ans=max(a,b)*max(c,d);
   
       cout<<ans;
   }
   else if(a>0 && b>0 && c<=0 && d<=0)
   {
       ans=min(a,b)*max(c,d);
   cout<<ans;
   }
   
   else if(a<=0 && b<=0 && c>0 && d>0)
   {
       ans=max(a,b)*min(c,d);
   
       cout<<ans;
   }
   else if(a<=0 && b=>0 && c<0 && d>0)
  {
      ans=max(a*c,b*d);
   cout<<ans;
  }
   else if(a<=0 &&b<=0 && c<=0 &&d<=0)
   {
       ans=min(a,b)*min(c,d);
   cout<<ans;
   }
   
   
   
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:38:22: error: expected primary-expression before '>' token
   38 |    else if(a<=0 && b=>0 && c<0 && d>0)
      |                      ^
Language: C++

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


Compiler output:
a.cc: In function 'int main()':
a.cc:9:13: error: 't_m' was not declared in this scope; did you mean 'tm'?
    9 |       cout<<t_m*t_d<<endl;
      |             ^~~
      |             tm
a.cc:9:17: error: 't_d' was not declared in this scope
    9 |       cout<<t_m*t_d<<endl;
      |                 ^~~