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

import java.awt.desktop.AboutHandler;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.*;

public class template {

    static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    static StringTokenizer st;
    static StringBuilder sb = new StringBuilder("");

    boolean[] sieveOfEratosthenes(int n)
    {
        boolean isPrime[] = new boolean[n+1];
        Arrays.fill(isPrime , true);
        isPrime[0] = false;
        isPrime[1] = false;
        for(int i = 2; i * i <= n ; i++)
        {
            for(int j = 2 * i ; j <= n; j += i)
                isPrime[i] = false;
        }
        return isPrime;
    }

    static long modExpo(long x, long y , int mod) {
        if(y == 0) {
            return 1;
        }
        if((y&1) == 0) {
            return modExpo(x * x , y >> 1 , mod);
        }
        long res = modExpo(x , y - 1 , mod) * x;
        return res > mod ? res - mod : res;
    }

    static int gcd(int a , int b) {
        if(a % b == 0) {
            return b;
        }
        return gcd(b , a % b);
    }

    static long[] inputArray(int n) throws IOException {
        long a[] = new long[n];
        st = new StringTokenizer(br.readLine());
        for(int i = 0 ; i < n ; i++) {
            a[i] = Long.parseLong(st.nextToken());
        }
        return a;
    }

    static int search(int numbers[] , int target) {
        int endIndex = -1;
        int low = 0;
        int high = numbers.length - 1;
        while (low <= high) {
            int mid = (high - low) / 2 + low;
            if (numbers[mid] > target) {
                high = mid - 1;
            } else if (numbers[mid] == target) {
                endIndex = mid;
                low = mid + 1;
            } else {
                low = mid + 1;
                endIndex = mid;
            }
        }
        return endIndex;
    }


    public static void main(String[] args) throws IOException {
        PriorityQueue<Integer> pq = new PriorityQueue<Integer>();
        pq.add(1);
        pq.add(3);
        pq.add(5);pq.add(2);
        pq.add(2);
        pq.add(2);
        pq.add(3);
        System.out.println(pq);
        pq.remove(2);
        System.out.println(pq);
    }

    public int findLeastNumOfUniqueInts(int[] a, int k) {
        int n = a.length;
        HashMap<Integer , Integer> freq = new HashMap<>();
        for(int i = 0 ; i < n ; i++) {
            if(freq.containsKey(a[i])) {
                freq.replace(a[i] , freq.get(a[i]) + 1);
            }
            else {
                freq.put(a[i] , 1);
            }
        }

        ArrayList<Integer> list = new ArrayList<>();
        for(Map.Entry<Integer , Integer> map : freq.entrySet()) {
            list.add(map.getValue());
        }
        Collections.sort(list);
        int i = 0;
        while(k > 0) {
            k -= list.get(i);
            i++;
        }
        return n-i;
    }


}
/*
10 5
1 2 3 4 5
5 3 2 3 5 3 1 2 3 2
 */

Compiler output:
Main.java:7: error: class template is public, should be declared in a file named template.java
public class template {
       ^
1 error
Language: C++

#include <iostream>
int main() {
  int a, b, c, d;
  long long ans;

  std::cin >> a >> b >> c >> d;
  ans = std::max(a * c, a * d);
  ans = std::max(ans, (long)b * c);
  ans = std::max(ans, (long)b * d);

  std::cout << ans << std::endl;

  return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:8:17: error: no matching function for call to 'max(long long int&, long int)'
    8 |   ans = std::max(ans, (long)b * c);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~
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:8:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long int')
    8 |   ans = std::max(ans, (long)b * c);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~
/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
a.cc:9:17: error: no matching function for call to 'max(long long int&, long int)'
    9 |   ans = std::max(ans, (long)b * d);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~
/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:9:17: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'long int')
    9 |   ans = std::max(ans, (long)b * d);
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~
/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
Language: C++

#include <iostream>
using namespace std;

int main() {
  int a;
  int b;
  int c;
  int d;
  int x;
  int y;
  int anuser;
  
  cin >> a;
  cin >> b;
  cin >> c;
  cin >> d;
  
  if (a >= b && c >= d && !(0 <= a) && !(0 <= c) && 10^9 >= a && 10^9 >= b &&
      10^9 >= c && 10^9 >= d && 10^9 <= a && 10^9 <= b && 10^9 <= c && 10^9 <= d) {
    b = x;
    d = y;
  }
  else if (a >= b && c >= d && 0 <= a && 0 <= d && !(d >= 0) 10^9 >= a && 10^9 >= b &&
      10^9 >= c && 10^9 >= d && 10^9 <= a && 10^9 <= b && 10^9 <= c && 10^9 <= d) {
    a = x;
    d = y;
  }
  else if (a >= b && c >= d && 0 <= a && 0 <= c && !(b >= 0) 10^9 >= a && 10^9 >= b &&
      10^9 >= c && 10^9 >= d && 10^9 <= a && 10^9 <= b && 10^9 <= c && 10^9 <= d) {
    b = x;
    c = y;
  }
  else if (a >= b && c >= d && 0 <= b && 0 <= d10^9 >= a && 10^9 >= b &&
      10^9 >= c && 10^9 >= d && 10^9 <= a && 10^9 <= b && 10^9 <= c && 10^9 <= d) {
    a = x;
    c = y;
  }
  
  anuser = x * y;
  
  cout << anuser << endl;
  
  return0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:23:61: error: expected ')' before numeric constant
   23 |   else if (a >= b && c >= d && 0 <= a && 0 <= d && !(d >= 0) 10^9 >= a && 10^9 >= b &&
      |           ~                                                 ^~~
      |                                                             )
a.cc:28:61: error: expected ')' before numeric constant
   28 |   else if (a >= b && c >= d && 0 <= a && 0 <= c && !(b >= 0) 10^9 >= a && 10^9 >= b &&
      |           ~                                                 ^~~
      |                                                             )
a.cc:33:47: error: 'd10' was not declared in this scope
   33 |   else if (a >= b && c >= d && 0 <= b && 0 <= d10^9 >= a && 10^9 >= b &&
      |                                               ^~~
a.cc:43:3: error: 'return0' was not declared in this scope
   43 |   return0;
      |   ^~~~~~~
Language: C

#include<stdio.h>
int main()
{
  int a,b,c,d,i;
  int e[4],n;
  scanf("%d %d %d %d",&a,&b,&c,&d);
  e[0]=a*c;e[1]=a*d;e[2]=b*c;e[3]=b*d;
  n=e[0];
  for(i=1;i<=3;i++)
  {
    if(n < e[i])
    {
      n=e[i];
    }
  }
  pritnf("%d",n);
}


Compiler output:
main.c: In function 'main':
main.c:16:3: error: implicit declaration of function 'pritnf'; did you mean 'printf'? [-Wimplicit-function-declaration]
   16 |   pritnf("%d",n);
      |   ^~~~~~
      |   printf
Language: C

#include<stdio.h>
int main()
{
  int a,b,c,d,i;
  int e[4],n;
  scanf("%d %d %d %d",a,b,c,d);
  e[0]=a*c;e[1]=a*d;e[2]=b*c;e[3]=b*d;
  n=e[0];
  for(i=1;i<=3;i++)
  {
    if(n < e[i])
    {
      n=e[i];
    }
  }
  pritnf("%d",n);
}

Compiler output:
main.c: In function 'main':
main.c:16:3: error: implicit declaration of function 'pritnf'; did you mean 'printf'? [-Wimplicit-function-declaration]
   16 |   pritnf("%d",n);
      |   ^~~~~~
      |   printf
Language: C++

#include<bits/stdc++.h>
using namespace std;
void solve(){
	long long a,b,c,d;
	cin>>a>>b>>c>>d;
	cout<<max(b*d,max((max(a*c,a*d),b*c));
}
int main() {
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	solve();

}


Compiler output:
a.cc: In function 'void solve()':
a.cc:6:31: warning: ignoring return value of 'constexpr const _Tp& std::max(const _Tp&, const _Tp&) [with _Tp = long long int]', declared with attribute 'nodiscard' [-Wunused-result]
    6 |         cout<<max(b*d,max((max(a*c,a*d),b*c));
      |                            ~~~^~~~~~~~~
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: declared here
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
a.cc:6:26: error: no matching function for call to 'max(long long int)'
    6 |         cout<<max(b*d,max((max(a*c,a*d),b*c));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~
/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:6:26: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
    6 |         cout<<max(b*d,max((max(a*c,a*d),b*c));
      |                       ~~~^~~~~~~~~~~~~~~~~~~~
/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 <cstdio>
#include <iostream>
#include <string>
#include <vector>
#include <sstream>
#include <map>
#include <set>
#include <queue>
#include <algorithm>
#include <cmath>
#include <cstring>
#include <typeinfo>
#include <numeric>
#include <functional>
#include <unordered_map>
#include <bitset>
#include <stack>
#include <assert.h>
#include <unordered_set>
#include <random>
#include <atcoder/all>


using namespace std;
using namespace atcoder;
using ll = long long;
using ull = unsigned long long;

const ll INF = 1e18;
const ll MOD = 1e9 + 7;


#define REP(i, n) for(ll i = 0; i < n; i++)























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

Compiler output:
a.cc:21:10: fatal error: atcoder/all: No such file or directory
   21 | #include <atcoder/all>
      |          ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  longlong A, B, C, D;
  cin >> A >> B >> C >> D;
  longlongans;
  ans = max(A*C, max(A*D, max(B*C, B*D)));
  cout << ans << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:3: error: 'longlong' was not declared in this scope
    5 |   longlong A, B, C, D;
      |   ^~~~~~~~
a.cc:6:10: error: 'A' was not declared in this scope
    6 |   cin >> A >> B >> C >> D;
      |          ^
a.cc:6:15: error: 'B' was not declared in this scope
    6 |   cin >> A >> B >> C >> D;
      |               ^
a.cc:6:20: error: 'C' was not declared in this scope
    6 |   cin >> A >> B >> C >> D;
      |                    ^
a.cc:6:25: error: 'D' was not declared in this scope
    6 |   cin >> A >> B >> C >> D;
      |                         ^
a.cc:7:3: error: 'longlongans' was not declared in this scope
    7 |   longlongans;
      |   ^~~~~~~~~~~
a.cc:8:3: error: 'ans' was not declared in this scope; did you mean 'abs'?
    8 |   ans = max(A*C, max(A*D, max(B*C, B*D)));
      |   ^~~
      |   abs
Language: C++

#include <bits/stdc++.h>
using namespace std;
 
int main() {
  int A, B, C, D:
  cin >> A >> B >> C >> D;
  int ans;
  ans = max(A*C, max(A*D, max(B*C, B*D)));
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:17: error: found ':' in nested-name-specifier, expected '::'
    5 |   int A, B, C, D:
      |                 ^
      |                 ::
a.cc:5:16: error: 'D' has not been declared
    5 |   int A, B, C, D:
      |                ^
a.cc:6:7: error: qualified-id in declaration before '>>' token
    6 |   cin >> A >> B >> C >> D;
      |       ^~
a.cc:8:24: error: 'D' was not declared in this scope
    8 |   ans = max(A*C, max(A*D, max(B*C, B*D)));
      |                        ^
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, max(A*D, max(B*C, B*D)))<< endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:17: error: found ':' in nested-name-specifier, expected '::'
    5 |   int A, B, C, D:
      |                 ^
      |                 ::
a.cc:5:16: error: 'D' has not been declared
    5 |   int A, B, C, D:
      |                ^
a.cc:6:7: error: qualified-id in declaration before '>>' token
    6 |   cin >> A >> B >> C >> D;
      |       ^~
a.cc:7:26: error: 'D' was not declared in this scope
    7 |   cout << max(A*C, max(A*D, max(B*C, B*D)))<< endl;
      |                          ^
Language: C++

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

#define mod 1000000007
#define ll long long

ll bow(ll x, ll y) {
  ll res = 1;
  for (ll i = 1; i <= y; ++i) {
    res = res * x % mod;
  }
  return res;
}

void solve() {
  ll a, , b, c, d;
  cin >> a >> b >> c >> d;
  ll ans = bow(10, n) - bow(9, n) - bow(9, n) + bow(8, n);
  ans %= mod;
  ans = (ans + mod) % mod;
  cout << ans;
}

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

Compiler output:
a.cc: In function 'void solve()':
a.cc:16:9: error: expected unqualified-id before ',' token
   16 |   ll a, , b, c, d;
      |         ^
a.cc:18:20: error: 'n' was not declared in this scope
   18 |   ll ans = bow(10, n) - bow(9, n) - bow(9, n) + bow(8, n);
      |                    ^
Language: C++

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

#define mod 1000000007
#define ll long long

ll bow(ll x, ll y) {
  ll res = 1;
  for (ll i = 1; i <= y; ++i) {
    res = res * x % mod;
  }
  return res;
}

void solve() {
  ll a, , b, c, d;
  cin >> a >> b >> c >> d;
  cout << max(max(a * c, a * d), max(b * c, b * d)) << endl;
}

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

Compiler output:
a.cc: In function 'void solve()':
a.cc:16:9: error: expected unqualified-id before ',' token
   16 |   ll a, , b, c, d;
      |         ^
Language: Java

import java.util.Scanner;

public class ProductMax {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int a = scan.nextInt();
        int b = scan.nextInt();
        int c = scan.nextInt();
        int d = scan.nextInt();
        scan.close();
        int max = a * c;
        for(int i = a; i <= b; i++){
            for(int j = c; j <= d; j++){
                if(i*j > max){
                    max = i*j;
                }
            }   
        }
        System.out.println(max);
    }
    
}

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

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

int main(){
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  /*int long aa = a*c;
  int long bb = a*d;
  int long cc = b*c;
  int long dd = b*d;
*/  cout << max(a*c, b*c, a*d ,b*d) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:16: error: no matching function for call to 'max(int, int, int, int)'
   11 | */  cout << max(a*c, b*c, a*d ,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<bits/stdc++.h>
using namespace std;

int main(){
  int a, b, c, d;
  cin >> a >> b >> c >> d;
  int aa = a*c;
  int bb = a*d;
  int cc = b*c;
  int dd = b*d;
  cout << max(aa, bb, cc ,dd) << endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: no matching function for call to 'max(int&, int&, int&, int&)'
   11 |   cout << max(aa, bb, cc ,dd) << 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<bits/stdc++.h>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:11:14: error: no matching function for call to 'max(long int&, long int&, long int&, long int&)'
   11 |   cout << max(aa, bb, cc ,dd) << 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<bits/stdc++.h>
 
using namespace std;
 
int main(){
  long long a,b,c,d;
  cin>>a>>b>>c>>d;
  
  cout<<max(a*c,b*d,a*d,b*c);
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:12: error: no matching function for call to 'max(long long int, long long int, long long int, long long int)'
    9 |   cout<<max(a*c,b*d,a*d,b*c);
      |         ~~~^~~~~~~~~~~~~~~~~
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<vector>
#include<string>
#include<algorithm>
#include<stack>
#include<queue>
#include<map>
#include<functional>
#include<math.h>
 
#define rep(i,n) for(ll i=0;i<(n);i++)
typedef long long ll;
using namespace std;

int main(void){
  int  a,b,c,d;
  cin >> a >> b >> c >> d;
  int ma = max(a*c,b*d);
  ma = max(ma,a*d);
  ma = max(ma,b*c);
  cout << ma;

Compiler output:
a.cc: In function 'int main()':
a.cc:21:14: error: expected '}' at end of input
   21 |   cout << ma;
      |              ^
a.cc:15:15: note: to match this '{'
   15 | int main(void){
      |               ^
Language: C++

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

using namespace std;

int main() {
    unsigned long long int a, b, c, d;
    vector<unsigned long long int> res;
    ios::sync_with_stdio(false);
    
    cin >> a >> b >> c >> d;

    res.push_back(a * c);
    res.push_back(b * d);
    res.push_back(b * c);
    res.push_back(a * d);

    res.sort(res.begin(), res.end());
    cout << res[3];
    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:19:9: error: 'class std::vector<long long unsigned int>' has no member named 'sort'
   19 |     res.sort(res.begin(), res.end());
      |         ^~~~
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
ll mod=1000000005;
using namespace std;

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

	ll x= max(a,b);
	ll y=max(c,d);
	ll res=(x*y)
	cout<<res<<endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:9: error: expected ',' or ';' before 'cout'
   14 |         cout<<res<<endl;
      |         ^~~~
Language: C++

#include <bits/stdc++.h>
#define ll long long
#define pb push_back
ll mod=1000000005
using namespace std;

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

	ll x= max(a,b);
	ll y=max(c,d);
	ll res=(x*y)
	cout<<res<<endl;
}

Compiler output:
a.cc:5:1: error: expected ',' or ';' before 'using'
    5 | using namespace std;
      | ^~~~~
a.cc: In function 'int main()':
a.cc:9:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    9 |         cin>>a>>b>>c>>d;
      |         ^~~
      |         std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146,
                 from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:11:15: error: 'max' was not declared in this scope; did you mean 'std::max'?
   11 |         ll x= max(a,b);
      |               ^~~
      |               std::max
In file included from /usr/include/c++/14/algorithm:61,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51:
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: 'std::max' declared here
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
a.cc:14:9: error: expected ',' or ';' before 'cout'
   14 |         cout<<res<<endl;
      |         ^~~~
Language: C++

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

int main(){


ll a,b,c,d,ans,t;
cin>>a>>b>>c>>d;
ans=min(a,b)*min(c,d);
t=max(a,b)*max(c,d);
ans=max(ans,t);

cout<<ans<<endl;








return 0;}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: 'll' was not declared in this scope
    7 | ll a,b,c,d,ans,t;
      | ^~
a.cc:8:6: error: 'a' was not declared in this scope
    8 | cin>>a>>b>>c>>d;
      |      ^
a.cc:8:9: error: 'b' was not declared in this scope
    8 | cin>>a>>b>>c>>d;
      |         ^
a.cc:8:12: error: 'c' was not declared in this scope
    8 | cin>>a>>b>>c>>d;
      |            ^
a.cc:8:15: error: 'd' was not declared in this scope
    8 | cin>>a>>b>>c>>d;
      |               ^
a.cc:9:1: error: 'ans' was not declared in this scope; did you mean 'abs'?
    9 | ans=min(a,b)*min(c,d);
      | ^~~
      | abs
a.cc:10:1: error: 't' was not declared in this scope; did you mean 'tm'?
   10 | t=max(a,b)*max(c,d);
      | ^
      | tm
Language: C++

#include <iostream>

using namespace std;
 
int main(){
    long long int a, b, c, d;

    cin >> a >> b >> c >> d;

    long long int multi[4];

    multi[0] = a * c; 
    multi[1] = a * d; 
    multi[2] = b * c; 
    multi[3] = b * d; 

    long long int max = multi[0];
    for (int = 1; i < 4; i++){
        if (max < multi[i]){
            max = multi[i];
        }
    }

    cout << max << endl;

return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:14: error: expected unqualified-id before '=' token
   18 |     for (int = 1; i < 4; i++){
      |              ^
a.cc:18:13: error: expected ';' before '=' token
   18 |     for (int = 1; i < 4; i++){
      |             ^~
      |             ;
a.cc:18:14: error: expected primary-expression before '=' token
   18 |     for (int = 1; i < 4; i++){
      |              ^
a.cc:18:19: error: 'i' was not declared in this scope
   18 |     for (int = 1; i < 4; i++){
      |                   ^
a.cc:18:24: error: expected ')' before ';' token
   18 |     for (int = 1; i < 4; i++){
      |         ~              ^
      |                        )
a.cc:18:26: error: 'i' was not declared in this scope
   18 |     for (int = 1; i < 4; i++){
      |                          ^
Language: C++

#include <iostream>

using namespace std;
 
int main(){
    int a, b, c, d;

    cin >> a >> b >> c >> d;

    long long int multi[4];

    multi[0] = a * c; 
    multi[1] = a * d; 
    multi[2] = b * c; 
    multi[3] = b * d; 

    long long int max = multi[0];
    for (int = 1; i < 4; i++){
        if (max < multi[i]){
            max = multi[i];
        }
    }

    cout << max;

return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:18:14: error: expected unqualified-id before '=' token
   18 |     for (int = 1; i < 4; i++){
      |              ^
a.cc:18:13: error: expected ';' before '=' token
   18 |     for (int = 1; i < 4; i++){
      |             ^~
      |             ;
a.cc:18:14: error: expected primary-expression before '=' token
   18 |     for (int = 1; i < 4; i++){
      |              ^
a.cc:18:19: error: 'i' was not declared in this scope
   18 |     for (int = 1; i < 4; i++){
      |                   ^
a.cc:18:24: error: expected ')' before ';' token
   18 |     for (int = 1; i < 4; i++){
      |         ~              ^
      |                        )
a.cc:18:26: error: 'i' was not declared in this scope
   18 |     for (int = 1; i < 4; i++){
      |                          ^
Language: C++


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

Compiler output:
a.cc: In function 'int main()':
a.cc:8:25: error: no matching function for call to 'max(bool)'
    8 |     std::cout << max(max(a*c<b*d),max(a*d,b*c)) << std::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:2:
/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(void){
  double a,b,c,d;
  scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
  int mass[4];
  mass[0]=a*d;
  mass[1]=a*c;
  mass[2]=b*c;
  mass[3]=b*d;
  double i,max,min;
  max = 0; min = 0;
  for(i=0;i<=3;i++){
    if(mass[i] > max)
      max = mass[i];
  }
  for(i=0;i<=3;i++){
    if(mass[i] < min)
      min = mass[i];
  }
  printf("%lf",max);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:12: error: array subscript is not an integer
   13 |     if(mass[i] > max)
      |            ^
main.c:14:17: error: array subscript is not an integer
   14 |       max = mass[i];
      |                 ^
main.c:17:12: error: array subscript is not an integer
   17 |     if(mass[i] < min)
      |            ^
main.c:18:17: error: array subscript is not an integer
   18 |       min = mass[i];
      |                 ^
Language: C

#include<stdio.h>
int main(void){
  double a,b,c,d;
  scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
  float mass[4];
  mass[0]=a*d;
  mass[1]=a*c;
  mass[2]=b*c;
  mass[3]=b*d;
  double i,max,min;
  max = 0; min = 0;
  for(i=0;i<=3;i++){
    if(mass[i] > max)
      max = mass[i];
  }
  for(i=0;i<=3;i++){
    if(mass[i] < min)
      min = mass[i];
  }
  printf("%lf",max);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:12: error: array subscript is not an integer
   13 |     if(mass[i] > max)
      |            ^
main.c:14:17: error: array subscript is not an integer
   14 |       max = mass[i];
      |                 ^
main.c:17:12: error: array subscript is not an integer
   17 |     if(mass[i] < min)
      |            ^
main.c:18:17: error: array subscript is not an integer
   18 |       min = mass[i];
      |                 ^
Language: C

#include<stdio.h>
int main(void){
  double a,b,c,d;
  scanf("%lf%lf%lf%lf",&a,&b,&c,&d);
  double mass[4];
  mass[0]=a*d;
  mass[1]=a*c;
  mass[2]=b*c;
  mass[3]=b*d;
  double i,max,min;
  max = 0; min = 0;
  for(i=0;i<=3;i++){
    if(mass[i] > max)
      max = mass[i];
  }
  for(i=0;i<=3;i++){
    if(mass[i] < min)
      min = mass[i];
  }
  printf("%lf",max);
  return 0;
}

Compiler output:
main.c: In function 'main':
main.c:13:12: error: array subscript is not an integer
   13 |     if(mass[i] > max)
      |            ^
main.c:14:17: error: array subscript is not an integer
   14 |       max = mass[i];
      |                 ^
main.c:17:12: error: array subscript is not an integer
   17 |     if(mass[i] < min)
      |            ^
main.c:18:17: error: array subscript is not an integer
   18 |       min = mass[i];
      |                 ^
Language: C++

#include <fstream>
#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <sstream>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <cmath>
#include <queue>
#include <random>

using namespace std;
struct XX{
int s;
    int e;
};

class xxGreater {
public:
bool operator()(const XX& riLeft, const XX& riRight) const {
        //第2条件
if((riLeft.s) == (riRight.s)){
return riLeft.e < riRight.e;//<:昇順(小さいものから順番)、>:降順(大きいものから順番)
           //プライオリティキューの場合は > で、top()すると値の小さいものがとれる
        }
        //第1条件
        return (riLeft.s) > (riRight.s);
    }
};


int main(int argc, const char * argv[])
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    
    longlong a,b,c,d;
    cin >> a>> b>>c>>d;
longlong ans=a*c;
ans=max(ans,a*d);
ans=max(ans,b*c);
ans=max(ans,b*d);


cout << ans <<endl;

}


//cout << "Hello World" << endl;


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:42:5: error: 'longlong' was not declared in this scope
   42 |     longlong a,b,c,d;
      |     ^~~~~~~~
a.cc:43:12: error: 'a' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |            ^
a.cc:43:16: error: 'b' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                ^
a.cc:43:19: error: 'c' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                   ^
a.cc:43:22: error: 'd' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                      ^
a.cc:44:9: error: expected ';' before 'ans'
   44 | longlong ans=a*c;
      |         ^~~~
      |         ;
a.cc:45:1: error: 'ans' was not declared in this scope; did you mean 'abs'?
   45 | ans=max(ans,a*d);
      | ^~~
      | abs
Language: C++

#include <fstream>
#include <iostream>
#include <algorithm>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <string>
#include <sstream>
#include <map>
#include <set>
#include <vector>
#include <stack>
#include <cmath>
#include <queue>
#include <random>

using namespace std;
struct XX{
int s;
    int e;
};

class xxGreater {
public:
bool operator()(const XX& riLeft, const XX& riRight) const {
        //第2条件
if((riLeft.s) == (riRight.s)){
return riLeft.e < riRight.e;//<:昇順(小さいものから順番)、>:降順(大きいものから順番)
           //プライオリティキューの場合は > で、top()すると値の小さいものがとれる
        }
        //第1条件
        return (riLeft.s) > (riRight.s);
    }
};


int main(int argc, const char * argv[])
{
    ios::sync_with_stdio(false);
    cin.tie(0);
    
    ll a,b,c,d;
    cin >> a>> b>>c>>d;
ll ans=a*c;
ans=max(ans,a*d);
ans=max(ans,b*c);
ans=max(ans,b*d);


cout << ans <<endl;

}


//cout << "Hello World" << endl;


Compiler output:
a.cc: In function 'int main(int, const char**)':
a.cc:42:5: error: 'll' was not declared in this scope
   42 |     ll a,b,c,d;
      |     ^~
a.cc:43:12: error: 'a' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |            ^
a.cc:43:16: error: 'b' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                ^
a.cc:43:19: error: 'c' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                   ^
a.cc:43:22: error: 'd' was not declared in this scope
   43 |     cin >> a>> b>>c>>d;
      |                      ^
a.cc:44:3: error: expected ';' before 'ans'
   44 | ll ans=a*c;
      |   ^~~~
      |   ;
a.cc:45:1: error: 'ans' was not declared in this scope; did you mean 'abs'?
   45 | ans=max(ans,a*d);
      | ^~~
      | abs
Language: C++

typedef vector<vi> vvi;
typedef pair<int, int> pii;

ll a, b, c, d;

int main()
{
	ios_base::sync_with_stdio(false);
	cin.tie(NULL);
	cin >> a >> b >> c >> d;
	ll res = max(max(a * c, a * d), max(c * a, c * b));
	if ((a <= 0 <= b) || (c <= 0 <= d))
		res = max(res, 0LL);
}

Compiler output:
a.cc:1:9: error: 'vector' does not name a type
    1 | typedef vector<vi> vvi;
      |         ^~~~~~
a.cc:2:9: error: 'pair' does not name a type
    2 | typedef pair<int, int> pii;
      |         ^~~~
a.cc:4:1: error: 'll' does not name a type
    4 | ll a, b, c, d;
      | ^~
a.cc: In function 'int main()':
a.cc:8:9: error: 'ios_base' has not been declared
    8 |         ios_base::sync_with_stdio(false);
      |         ^~~~~~~~
a.cc:9:9: error: 'cin' was not declared in this scope
    9 |         cin.tie(NULL);
      |         ^~~
a.cc:9:17: error: 'NULL' was not declared in this scope
    9 |         cin.tie(NULL);
      |                 ^~~~
a.cc:1:1: note: 'NULL' is defined in header '<cstddef>'; this is probably fixable by adding '#include <cstddef>'
  +++ |+#include <cstddef>
    1 | typedef vector<vi> vvi;
a.cc:10:16: error: 'a' was not declared in this scope
   10 |         cin >> a >> b >> c >> d;
      |                ^
a.cc:10:21: error: 'b' was not declared in this scope
   10 |         cin >> a >> b >> c >> d;
      |                     ^
a.cc:10:26: error: 'c' was not declared in this scope
   10 |         cin >> a >> b >> c >> d;
      |                          ^
a.cc:10:31: error: 'd' was not declared in this scope
   10 |         cin >> a >> b >> c >> d;
      |                               ^
a.cc:11:9: error: 'll' was not declared in this scope
   11 |         ll res = max(max(a * c, a * d), max(c * a, c * b));
      |         ^~
a.cc:13:17: error: 'res' was not declared in this scope
   13 |                 res = max(res, 0LL);
      |                 ^~~
a.cc:13:23: error: 'max' was not declared in this scope
   13 |                 res = max(res, 0LL);
      |                       ^~~
Language: C++

#include<bits/stdc++.h>

using namespace std;

long long a,b,c,d;

int main() {
  scanf ("%lld %lld %lld %lld", &a, &b, &c &d);
  
  printf ("%lld", max(a * c, max(a * d, max(b * c, b * d))));
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:8:44: error: invalid operands of types 'long long int*' and 'long long int' to binary 'operator&'
    8 |   scanf ("%lld %lld %lld %lld", &a, &b, &c &d);
      |                                         ~~ ^~
      |                                         |   |
      |                                         |   long long int
      |                                         long long int*
Language: C++

#define rep(i,n) for (int i=0;i<n;i++)
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mod 1000000007
 
 
int main(){
  
long long a,b,c,d;
  cin >> a >>b >> c >> d;
  　
  cout << max(max(a*b,a*c),max(b*c,b*d)) << endl;
  
  
}



Compiler output:
a.cc:12:3: error: extended character 　 is not valid in an identifier
   12 |   　
      |   ^
a.cc: In function 'int main()':
a.cc:12:3: error: '\U00003000' was not declared in this scope
   12 |   　
      |   ^~
Language: C++

#include <bist/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,b*d)));
    return 0;
}

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

3include<bits/stdc++.h>
using namespace std;

int main()
{
 int a,b,c,d;
  cin>>a>>b>>c>>d;
  int ans;
  ans=max(a*c,a*d);
  int ans1=max(b*c,b*d);
  int anss=max(ans,ans1);
  cout<<ans<<endl;
  
}

Compiler output:
a.cc:1:1: error: expected unqualified-id before numeric constant
    1 | 3include<bits/stdc++.h>
      | ^~~~~~~~
a.cc: In function 'int main()':
a.cc:7:3: error: 'cin' was not declared in this scope
    7 |   cin>>a>>b>>c>>d;
      |   ^~~
a.cc:9:7: error: 'max' was not declared in this scope
    9 |   ans=max(a*c,a*d);
      |       ^~~
a.cc:12:3: error: 'cout' was not declared in this scope
   12 |   cout<<ans<<endl;
      |   ^~~~
a.cc:12:14: error: 'endl' was not declared in this scope
   12 |   cout<<ans<<endl;
      |              ^~~~
Language: C++

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

int main(){

  int a,b,c,d;
  cin >> a >> b >> c >> d;
  
  
  if((a*-1)*(c*-1) >= b*d){
  	cout << a*c << endl;
  }else cout << b*d << endl;
}

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

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

int main(){

  int a,b,c,d;
  cin >> a >> b >> c >> d;
  
  
  if((a*-1)*(c*-1) >= b*d){
  	cout << a*c << endl;
  }else cout << b*d << endl;
}

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

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


Compiler output:
a.cc: In function 'int main()':
a.cc:15:36: error: expected ';' before 'return'
   15 |         cout << max({w,x,y,z},comp)
      |                                    ^
      |                                    ;
   16 |     return 0;
      |     ~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  int sum1=a*c;
  int sum2=a*d;
  int sum3=b*c;
  int sum4=b*d;
  int sum=max(sum1,sum2);
  sum=max(sum2,sum3);
  sum=max(sum3,sum4);
  cout<<sum;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:5:12: error: 'a' was not declared in this scope
    5 |   int sum1=a*c;
      |            ^
a.cc:5:14: error: 'c' was not declared in this scope
    5 |   int sum1=a*c;
      |              ^
a.cc:6:14: error: 'd' was not declared in this scope
    6 |   int sum2=a*d;
      |              ^
a.cc:7:12: error: 'b' was not declared in this scope
    7 |   int sum3=b*c;
      |            ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'y' was not declared in this scope
   14 |     y=c;
      |     ^
a.cc:16:5: error: 'y' was not declared in this scope
   16 |     y=d;
      |     ^
a.cc:18:5: error: 'y' was not declared in this scope
   18 |     y=c;
      |     ^
a.cc:19:11: error: 'y' was not declared in this scope
   19 |   cout<<x*y;
      |           ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:14:5: error: 'y' was not declared in this scope
   14 |     y=c;
      |     ^
a.cc:16:5: error: 'y' was not declared in this scope
   16 |     y=d;
      |     ^
a.cc:18:5: error: 'y' was not declared in this scope
   18 |     y=c;
      |     ^
a.cc:19:11: error: 'y' was not declared in this scope
   19 |   cout<<x*y;
      |           ^
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 = 0;
  ans = max(a*c, max(a*d, max(b*d, b*c)));
  cout<<ans<<"\n";
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:11:12: error: expected '}' at end of input
   11 |   return 0;
      |            ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^
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 = 0;
  for(ll i=a; i<=b; i++){
    for(ll j=c; j<=d; j++){
      ans = max(ans, (i*j));
    }
  }
  cout<<ans<<"\n";
  return 0;

Compiler output:
a.cc: In function 'int main()':
a.cc:15:12: error: expected '}' at end of input
   15 |   return 0;
      |            ^
a.cc:5:11: note: to match this '{'
    5 | int main(){
      |           ^