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 = 0;
  for(int i=a; i<=b; i++){
    for(int 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:11:16: error: no matching function for call to 'max(long long int&, int)'
   11 |       ans = max(ans, i*j);
      |             ~~~^~~~~~~~~~
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:   template argument deduction/substitution failed:
a.cc:11:16: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   11 |       ans = max(ans, i*j);
      |             ~~~^~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:11:16: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   11 |       ans = max(ans, i*j);
      |             ~~~^~~~~~~~~~
Language: C

#include <stdio.h>
int main(void){
	int A,B,C,D,K;
	scanf("%d %d %d %d",&A &B &C &D);
	if (B>=0&&D>=0){
		K=B*C;
		printf("%d\n",K);
	{
	else if (B<=0&&D<=0){
		K=A*C;
		printf("%d\n",K);
	}
	else if (B>=0&&D<=0){
		K=B*D;
		printf("%d\n",K);
	}
	else if (B<=0&&D>=0){
		K=B*C;
		printf("%d\n",K);
	}
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:32: error: invalid operands to binary & (have 'int *' and 'int')
    4 |         scanf("%d %d %d %d",&A &B &C &D);
      |                             ~~ ^
      |                             |
      |                             int *
main.c:9:9: error: 'else' without a previous 'if'
    9 |         else if (B<=0&&D<=0){
      |         ^~~~
main.c:22:1: error: expected declaration or statement at end of input
   22 | }
      | ^
main.c:22:1: error: expected declaration or statement at end of input
Language: C

#include <stdio.h>
int main(void){
	int A,B,C,D;
	scanf("%d%d%d%d",&A&B&C&D);
	if (B>=0&&D>=0) printf("B*C",B,D);
	else if (B<=0&&D<=0) printf("A*C",A,C);
	else if (B>=0&&D<=0) printf("A*D",A,D);
	else if (B<=0&&D>=0) printf("B*C",B,C);
	return 0;
}

Compiler output:
main.c: In function 'main':
main.c:4:28: error: invalid operands to binary & (have 'int *' and 'int')
    4 |         scanf("%d%d%d%d",&A&B&C&D);
      |                          ~~^
      |                          |
      |                          int *
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:2: error: 'ans' was not declared in this scope; did you mean 'abs'?
    7 |  ans=max(max(a*c, 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;
 if(a>0&&c>0){cout<<b*d<<endl}
 if(b<0&&c<0){cout<<a*c<<endl}
 if(a*c>b*d){cout<<a*c<<endl}
 if(a*c<b*d){cout<<b*d<<endl}
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:30: error: expected ';' before '}' token
    7 |  if(a>0&&c>0){cout<<b*d<<endl}
      |                              ^
      |                              ;
a.cc:8:30: error: expected ';' before '}' token
    8 |  if(b<0&&c<0){cout<<a*c<<endl}
      |                              ^
      |                              ;
a.cc:9:29: error: expected ';' before '}' token
    9 |  if(a*c>b*d){cout<<a*c<<endl}
      |                             ^
      |                             ;
a.cc:10:29: error: expected ';' before '}' token
   10 |  if(a*c<b*d){cout<<b*d<<endl}
      |                             ^
      |                             ;
Language: C++

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

    else{
        printf("%lld",x);
    }
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:23:13: error: 'X' was not declared in this scope
   23 |     else if(X=y && z==p){
      |             ^
Language: C++

#include <stdio.h>
#include <algorithm>

using namespace std;

int main(){

	int a,arr[4],b,c,d;
	scanf("%d %d %d %d",&a,&b,&c,&d);
	arr[0] = a*c;
	arr[1] = a*d;
	arr[2] = b*c;
	arr[3] = b*d;
	sort(arr,arr+4);
	pritnf("%d\n",arr[3]);
	return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:15:9: error: 'pritnf' was not declared in this scope; did you mean 'printf'?
   15 |         pritnf("%d\n",arr[3]);
      |         ^~~~~~
      |         printf
Language: C++

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

int main() {
  long long a, b, c, d;
  cin >> a >> b >> c >> d;
  long long ans = max(-2e18, a * c);
  ans = max(ans, a * d);
  ans = max(ans, b * c);
  ans = max(ans, b * d);
  cout << ans << endl;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:22: error: no matching function for call to 'max(double, long long int)'
    7 |   long long ans = max(-2e18, a * 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:   template argument deduction/substitution failed:
a.cc:7:22: note:   deduced conflicting types for parameter 'const _Tp' ('double' and 'long long int')
    7 |   long long ans = max(-2e18, a * 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
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, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:7:22: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
    7 |   long long ans = max(-2e18, a * c);
      |                   ~~~^~~~~~~~~~~~~~
Language: C++

#include <iostream>
#include <iomanip>
#include <algorithm>
#include <array>
#include <cassert>
#include <utility>
#include <vector>
#include <atcoder/all>

template <class InputIterator>
std::ostream& range_output(std::ostream& os_arg, InputIterator first_arg, InputIterator last_arg){ if(first_arg != last_arg){ do{ os_arg << *(first_arg++); if(first_arg == last_arg) break; os_arg << ' '; } while(true); }  return os_arg; }
template <class Tp> std::ostream& operator << (std::ostream& os_arg, const std::vector<Tp>& arr_arg){ return range_output(os_arg, arr_arg.cbegin(), arr_arg.cend()); }
template <class Tp, std::size_t Size> std::ostream& operator << (std::ostream& os_arg, const std::array<Tp, Size>& arr_arg){ return range_output(os_arg, arr_arg.cbegin(), arr_arg.cend()); }
template <class S, class T> std::ostream& operator << (std::ostream& os_arg, const std::pair<S, T>& pair_arg){ return os_arg << '(' << pair_arg.first << ", " << pair_arg.second << ')'; }

#ifndef ONLINE_JUDGE
    template <typename Head> void dump_out(Head head_arg){ std::cerr << head_arg << '\n'; }
    template <typename Head, typename... Tail>
    void dump_out(Head head_arg, Tail... tail_args){ std::cerr << head_arg << ", "; dump_out(tail_args...); }
    #define dump(...) do { std::cerr << "[in line " << __LINE__ << "] " << #__VA_ARGS__ << " : "; dump_out(__VA_ARGS__); } while(false)
#else
    #define dump(...) (void(0))
#endif




int main(void){
    std::cin.tie(nullptr); std::ios_base::sync_with_stdio(false); 
    std::cout << std::fixed << std::setprecision(16);

    std::array<int, 2> X, Y;
    for(int i = 0; i < 2; ++i) std::cin >> X[i];
    for(int i = 0; i < 2; ++i) std::cin >> Y[i];
    long long int res = std::numeric_limits<long long int>::min();
    for(int i = 0; i < 2; ++i){
        for(int j = 0; j < 2; ++j){
            const long long int val = static_cast<long long int>(X[i]) * Y[j];
            if(res < val) res = val;
        }
    }
    std::cout << res << '\n';
    return 0;
}

Compiler output:
a.cc:8:10: fatal error: atcoder/all: No such file or directory
    8 | #include <atcoder/all>
      |          ^~~~~~~~~~~~~
compilation terminated.
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:9:14: error: expected ';' before 'cout'
    9 |    b=min(a,b)
      |              ^
      |              ;
   10 |   cout<<(d*b);}
      |   ~~~~
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 maxi=INT_MIN;
 for(long long int i=a;i<=b;i++)
 {for(long long int j=c;j<=c;j++)
 {maxi=max(maxi,(i*j));}
  cout<<maxi;}

Compiler output:
a.cc: In function 'int main()':
a.cc:10:15: error: expected '}' at end of input
   10 |   cout<<maxi;}
      |               ^
a.cc:4:1: note: to match this '{'
    4 | {long long int a,b,c,d;
      | ^
Language: C++

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

Compiler output:
a.cc: In function 'int main()':
a.cc:10:14: error: no matching function for call to 'max(long long int&, long long int&, long long int&, long long int&)'
   10 |   cout << max(A,B,C,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(){
    long long a,b,c,d;
    cin>>a>>b>>c>>d;
    cout<<max(max(a*c,a*d),max(b*c,b*d))<<;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:7:43: error: expected primary-expression before ';' token
    7 |     cout<<max(max(a*c,a*d),max(b*c,b*d))<<;
      |                                           ^
Language: C++

#include<bits.stdc++.h>

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

Compiler output:
a.cc:1:9: fatal error: bits.stdc++.h: No such file or directory
    1 | #include<bits.stdc++.h>
      |         ^~~~~~~~~~~~~~~
compilation terminated.
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})<<endl;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:5:14: error: no matching function for call to 'max(<brace-enclosed initializer list>)'
    5 |     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 <iostream>
#include <algorithm>
using namespace std;

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

Compiler output:
cc1plus: error: '::main' must return 'int'
a.cc: In function 'int main()':
a.cc:13:3: error: 'ans' was not declared in this scope; did you mean 'abs'?
   13 |   ans =x*y;
      |   ^~~
      |   abs
Language: C++

#include <iostream>
using namespace std;

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

Compiler output:
cc1plus: error: '::main' must return 'int'
a.cc: In function 'int main()':
a.cc:12:3: error: 'ans' was not declared in this scope; did you mean 'abs'?
   12 |   ans = max(x*y);
      |   ^~~
      |   abs
a.cc:12:12: error: no matching function for call to 'max(long long int)'
   12 |   ans = max(x*y);
      |         ~~~^~~~~
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

a,b,c,d=map(int, input().split())

list=[a*c,a*d,b*c,b*d]

print(max(list))

Compiler output:
main.c:1:1: warning: data definition has no type or storage class
    1 | a,b,c,d=map(int, input().split())
      | ^
main.c:1:1: error: type defaults to 'int' in declaration of 'a' [-Wimplicit-int]
main.c:1:3: error: type defaults to 'int' in declaration of 'b' [-Wimplicit-int]
    1 | a,b,c,d=map(int, input().split())
      |   ^
main.c:1:5: error: type defaults to 'int' in declaration of 'c' [-Wimplicit-int]
    1 | a,b,c,d=map(int, input().split())
      |     ^
main.c:1:7: error: type defaults to 'int' in declaration of 'd' [-Wimplicit-int]
    1 | a,b,c,d=map(int, input().split())
      |       ^
main.c:1:9: error: implicit declaration of function 'map' [-Wimplicit-function-declaration]
    1 | a,b,c,d=map(int, input().split())
      |         ^~~
main.c:1:13: error: expected expression before 'int'
    1 | a,b,c,d=map(int, input().split())
      |             ^~~
main.c:3:1: error: expected ',' or ';' before 'list'
    3 | list=[a*c,a*d,b*c,b*d]
      | ^~~~
Language: C++

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

#define ll long long int
#define pb push_back
#define endl "\n"



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


Compiler output:
a.cc: In function 'int main()':
a.cc:15:14: error: no matching function for call to 'max(long long int&, int)'
   15 |     ans = max(ans,min(a,b)*min(c,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:   template argument deduction/substitution failed:
a.cc:15:14: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'int')
   15 |     ans = max(ans,min(a,b)*min(c,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
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, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   template argument deduction/substitution failed:
a.cc:15:14: note:   mismatched types 'std::initializer_list<_Tp>' and 'long long int'
   15 |     ans = max(ans,min(a,b)*min(c,d));
      |           ~~~^~~~~~~~~~~~~~~~~~~~~~~
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  long long R[4];
  long long a, b, c, d;
  
  cin >> a >> b >> c >> d;
  
  R[0] = a * c;
  R[1] = a * d;
  R[2] = b * c;
  R[3] = b * d;
  
  sort(R.begin(), R.end() );
  
  cout << R[3] << endl;
  
  return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:14:10: error: request for member 'begin' in 'R', which is of non-class type 'long long int [4]'
   14 |   sort(R.begin(), R.end() );
      |          ^~~~~
a.cc:14:21: error: request for member 'end' in 'R', which is of non-class type 'long long int [4]'
   14 |   sort(R.begin(), R.end() );
      |                     ^~~
Language: Java

import java.util.*;
import java.io.*;
 
public class Main{
  Scanner sc = new Scanner(System.in);	
 
  public void run(){
    long a = sc.nextLong();
    long b = sc.nextLong();
    long c = sc.nextLong();
    long d = sc.nextLong();
    
    long max = 0;
    max = Math.max(max, a*c);
    max = Math.max(max, a*d);
    max = Math.max(max, b*c);
    max = Math.max(max, b*d);
    
    System.out.println(max);
  }
  public static void main(String[] args){
    Main m = new Main();
    m.run();
  }
}
import java.util.*;
import java.io.*;
 
public class Main{
  Scanner sc = new Scanner(System.in);	
 
  public void run(){
    long a = sc.nextLong();
    long b = sc.nextLong();
    long c = sc.nextLong();
    long d = sc.nextLong();
    
    long max = a*c;
    max = Math.max(max, a*d);
    max = Math.max(max, b*c);
    max = Math.max(max, b*d);
    
    System.out.println(max);
  }
  public static void main(String[] args){
    Main m = new Main();
    m.run();
  }
}


Compiler output:
Main.java:26: error: class, interface, enum, or record expected
import java.util.*;
^
Main.java:27: error: class, interface, enum, or record expected
import java.io.*;
^
2 errors
Language: C++

#include<iostream>
#include<cmath>
using namespace std;
int main(){
long a,b,c,d;
cin>>a>>b>>c>>d;
k=max(a*c,a*d);
j=max(b*c,b*d);
val=max(k,j);
cout<<val;  
 
 
return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:7:1: error: 'k' was not declared in this scope
    7 | k=max(a*c,a*d);
      | ^
a.cc:8:1: error: 'j' was not declared in this scope
    8 | j=max(b*c,b*d);
      | ^
a.cc:9:1: error: 'val' was not declared in this scope
    9 | val=max(k,j);
      | ^~~
Language: C++

#include <iostream>
using namspace std;

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


Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namspace'
    2 | using namspace std;
      |       ^~~~~~~~
a.cc: In function 'int main()':
a.cc:6:9: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    6 |         cin >> a >> b >> c >> d;
      |         ^~~
      |         std::cin
In file included 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:7:9: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    7 |         cout<<max(max(a*c,a*d),max(b*c,b*d))<<endl;
      |         ^~~~
      |         std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:7:19: error: 'max' was not declared in this scope; did you mean 'std::max'?
    7 |         cout<<max(max(a*c,a*d),max(b*c,b*d))<<endl;
      |                   ^~~
      |                   std::max
In file included from /usr/include/c++/14/string:51,
                 from /usr/include/c++/14/bits/locale_classes.h:40,
                 from /usr/include/c++/14/bits/ios_base.h:41,
                 from /usr/include/c++/14/ios:44,
                 from /usr/include/c++/14/ostream:40,
                 from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: 'std::max' declared here
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
a.cc:7:15: error: 'max' was not declared in this scope; did you mean 'std::max'?
    7 |         cout<<max(max(a*c,a*d),max(b*c,b*d))<<endl;
      |               ^~~
      |               std::max
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: 'std::max' declared here
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
a.cc:7:47: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    7 |         cout<<max(max(a*c,a*d),max(b*c,b*d))<<endl;
      |                                               ^~~~
      |                                               std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
Language: C++

#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
  long long a, b ,c ,d;
  cin >> a >> b >> c >> d;
  long long 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:8:46: error: request for member 'b' in 'c', which is of non-class type 'long long int'
    8 |   long long ans = max(a*c, max(a*d, max(b*c. b*d)));
      |                                              ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main()
{
  long long a,b,c,d;
  cin>>a>>b>>c>>d;
  vector<long long>v(4);
  v.push_back(a*c);
  v.push_back(a*d);
  v.push_back(b*c);
  v.push_back(b*d);
  sort(v.begin(),v.end(),greater<long long>()):
  cout<<v[0];
  
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:47: error: expected ';' before ':' token
   12 |   sort(v.begin(),v.end(),greater<long long>()):
      |                                               ^
      |                                               ;
Language: C++

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

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

    int a,b,c,d;
    cin >>a>>b>>c>>d;

    cout<<max({a*b,a*c,a*d,b*c,b*d,c*d})
}




Compiler output:
a.cc: In function 'int main()':
a.cc:11:41: error: expected ';' before '}' token
   11 |     cout<<max({a*b,a*c,a*d,b*c,b*d,c*d})
      |                                         ^
      |                                         ;
   12 | }
      | ~
Language: C++

#include "bits/stdc++.h"
#define PRECISION(x) cout << fixed << setprecision(x)
#define FAST_IO ios::sync_with_stdio(false); cin.tie(NULL); cout.tie(NULL);
#define SZ(X) ((int)(X).size())
#define ALL(X) (X).begin(), (X).end()
#define ALLR(X) (X).rbegin(), (X).rend()
#define MP make_pair
#define PB push_back
#define EB emplace_back
#define F first
#define S second

using namespace std;
 
template<class T> bool max_self(T & a, const T & b){ 
  return b > a ? a = b, true : false; 
}
template<class T> bool min_self(T & a, const T & b){ 
  return b < a ? a = b, true : false;    
}
typedef long long LL;
const int INF = 1e9 + 7;
const double PI = acos(-1.0);
const double EPS = (1e-9


int main(){
  FAST_IO
  LL a, b, c, d;
  cin >> a >> b >> c >> d;
  LL opt = a * c;
  max_self(opt, a * d);
  max_self(opt, b * c);
  max_self(opt, b * d);

  cout << opt << '\n';
  return 0;
}



Compiler output:
a.cc:24:25: error: expected ')' before 'int'
   24 | const double EPS = (1e-9
      |                    ~    ^
      |                         )
......
   27 | int main(){
      | ~~~                      
a.cc:38:2: error: expected ',' or ';' at end of input
   38 | }
      |  ^
Language: C

#include<stdio.h>
int ans(int a,int b,int c,int d){
  if(a>=b&&a>=c&&a>=d)
    return a;
  else if(b>=a&&b>=c&&b>=d)
    return b;
  else if(c>=a&&c>=b&&c>=dd)
    return c;
  else
    return d;
  
  
}
int main(){
  int a,b,c,d;
  scanf("%d%d%d%d",&a,&b,&c,&d);
  int aa=a*c,bb=a*d,cc=b*c,dd=b*d;
  printf("%d",ans(aa,bb,cc,dd));
   
  return 0;
}


Compiler output:
main.c: In function 'ans':
main.c:7:26: error: 'dd' undeclared (first use in this function); did you mean 'd'?
    7 |   else if(c>=a&&c>=b&&c>=dd)
      |                          ^~
      |                          d
main.c:7:26: note: each undeclared identifier is reported only once for each function it appears in
Language: C

#include<stdio.h>
int ans(int a,int b,int c,int d){
  if(a>=b&&a>=c&&a>=d)
    return a;
  else if(b>=a&&b>=c&&b>=d)
    return b;
  else if(c>=a&&c>=b&&c>=dd)
    return c;
  else
    return d;
  
  
}
int main(){
  int a,b,c,d;
  scanf("%d%d%d%d",&a,&b,&c,&d);
  int aa=a*c,bb=a*d,cc=b*c,dd=b*d;
  printf("%d",max({aa,bb,cc,dd}));
   
  return 0;
}


Compiler output:
main.c: In function 'ans':
main.c:7:26: error: 'dd' undeclared (first use in this function); did you mean 'd'?
    7 |   else if(c>=a&&c>=b&&c>=dd)
      |                          ^~
      |                          d
main.c:7:26: note: each undeclared identifier is reported only once for each function it appears in
main.c: In function 'main':
main.c:18:15: error: implicit declaration of function 'max' [-Wimplicit-function-declaration]
   18 |   printf("%d",max({aa,bb,cc,dd}));
      |               ^~~
main.c:18:19: error: expected expression before '{' token
   18 |   printf("%d",max({aa,bb,cc,dd}));
      |                   ^
Language: C

#include<stdio.h>
#include<algorithm>
int main(){
  int a,b,c,d;
  scanf("%d%d%d%d",&a,&b,&c,&d);
  printf("%d",max({a,b,c,d}));
   
  return 0;
}


Compiler output:
main.c:2:9: fatal error: algorithm: No such file or directory
    2 | #include<algorithm>
      |         ^~~~~~~~~~~
compilation terminated.
Language: C

#include<stdio.h>
#include<algorithm.h>
int main(){
  int a,b,c,d;
  scanf("%d%d%d%d",&a,&b,&c,&d);
  printf("%d",max({a,b,c,d}));
   
  return 0;
}

Compiler output:
main.c:2:9: fatal error: algorithm.h: No such file or directory
    2 | #include<algorithm.h>
      |         ^~~~~~~~~~~~~
compilation terminated.
Language: C++

#include<iostream>
#include<cstdio>
#include<algorithm>
#include<cmath>
#include<cstring>
#include<string>
#include<stack>
#include<queue>
#include<set>
#include<map>
#include<time.h>
#include<vector>
using namespace std;
#define ll long long
int main()
{
    //ios::sync_with_stdio(false);
    //cin.tie(0);
    //cout.tie(0);
    int a,b,c,d;
    cin>>a>>b>>c>>d;
    ll t1,t2,t3,t4;
    t1 = a*b;
    t2 = a*c;
    t3 = b*c;
    t4 = b*d;
    ll ans = max(t1,t2);
    ans = max(ans,t3);
    ans = max(ans,t4);
    cout<<anns<<endl;
    return 0;
}


Compiler output:
a.cc: In function 'int main()':
a.cc:30:11: error: 'anns' was not declared in this scope; did you mean 'ans'?
   30 |     cout<<anns<<endl;
      |           ^~~~
      |           ans
Language: C++

#include <bits/stdc++.h>
#define ll long long int
#define pb push_back
#define forn(i,n1, n2) for (ll i = n1; i < n2; i++)
#define w(t) ll t;cin>>t;while(t--)
#define en "\n"
#define f first
#define s second
const ll mod = 1000000007;
using namespace std;
ll i, n, m, x, y, z, j, k, l, mn = LLONG_MAX, mx = 0, c, a[2000005], r, cnt = 0, sum = 0,p;
string str;
char ch;
set<ll> s;
map<ll, ll> mp;
vector<vector<ll>> g;
vector<ll> v;
char grid[60][60];
ll d[60][60];
bool vis[60][60];
ll dx[] = {0, 1, 0, -1, 1, -1, -1, 1};
ll dy[] = {1, 0, -1, 0, 1, -1, 1, -1};
ll gcd(ll a , ll b)
{
    if(b==0)return a;
    return gcd(b,a%b);
}
int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(NULL);
    ll k1,k2,k3,k4;
    k1=a*c;
    k2=a*d;
    k3=b*d;
    k4=b*c;
    cout<<max(max(k1,k2),max(k3,k4));

    return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:34:9: error: invalid operands of types 'long long int [2000005]' and 'long long int' to binary 'operator*'
   34 |     k1=a*c;
      |        ~^~
      |        | |
      |        | long long int
      |        long long int [2000005]
a.cc:35:9: error: invalid operands of types 'long long int [2000005]' and 'long long int [60][60]' to binary 'operator*'
   35 |     k2=a*d;
      |        ~^~
      |        | |
      |        | long long int [60][60]
      |        long long int [2000005]
a.cc:36:8: error: 'b' was not declared in this scope
   36 |     k3=b*d;
      |        ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
int main(){
  ll a,b,c,d;
  ll e[4]={};
  cin>>a>>b>>c>>d;
  e[0]=a*c;e[1]=a*d;e[2]=b*c;e[3]=b*d;
  ll p=*max_element(e,e+n);
  cout<<p<<"\n";
    return 0;}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:25: error: 'n' was not declared in this scope
    9 |   ll p=*max_element(e,e+n);
      |                         ^
Language: C

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

using namespace std;

const int mod = 1e9 + 7;

long long add(long long a, long long b) {
    long long res = a + b;
    if (res >= mod) res -= mod;
    return res;
}

long long sub(long long a, long long b) {
    long long res = a - b + mod;
    if (res >= mod) res -= mod;
    return res;
}

long long mul(long long a, long long b) {
    return (((a % mod) * (b % mod)) % mod);
}

long long potolok(long long a, long long b){   // округление вверх для целых
    return (a + b - 1) / b;
}


long long gcd(long long x, long long y){
    if(y == 0){
        return x;
    }
    if(x > y){
         return gcd(y, x % y);
    }
    else{
         return gcd(x, y % x);
    }
}

bool cmpr(int x, int y){            // сортировка по абсолютной величине
    if(abs(x) < abs(y)) return true;
    else{
        return false;
    }
}

bool comp(pair<int, int> x, pair<int, int> y){  // сортировка по первой компоненте
    if(x.first < y.first)return true;
    else if(x.first == y.first){
        if(x.second < y.second)return true;
        else return false;
    }
    else{
        return false;
    }
}

int main(){
    long long a, b, c, d;
    cin >> a >> b >> c >> d;
    long long tmp1 = a * c, tmp2 = a * d, tmp3 = b * c, tmp4 = b * d;
    vector<long long> v;
    v.push_back(tmp1);
    v.push_back(tmp2);
    v.push_back(tmp3);
    v.push_back(tmp4);
    cout << *max_element(v.begin(), v.end()) << endl;
 }


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

#include <bits/stdc++.h>

using namespace std;

const int mod = 1e9 + 7;

long long add(long long a, long long b) {
    long long res = a + b;
    if (res >= mod) res -= mod;
    return res;
}

long long sub(long long a, long long b) {
    long long res = a - b + mod;
    if (res >= mod) res -= mod;
    return res;
}

long long mul(long long a, long long b) {
    return (((a % mod) * (b % mod)) % mod);
}

long long potolok(long long a, long long b){   // округление вверх для целых
    return (a + b - 1) / b;
}


long long gcd(long long x, long long y){
    if(y == 0){
        return x;
    }
    if(x > y){
         return gcd(y, x % y);
    }
    else{
         return gcd(x, y % x);
    }
}

bool cmpr(int x, int y){            // сортировка по абсолютной величине
    if(abs(x) < abs(y)) return true;
    else{
        return false;
    }
}

bool comp(pair<int, int> x, pair<int, int> y){  // сортировка по первой компоненте
    if(x.first < y.first)return true;
    else if(x.first == y.first){
        if(x.second < y.second)return true;
        else return false;
    }
    else{
        return false;
    }
}

int main(){
    long long a, b, c, d;
    cin >> a >> b >> c >> d;
    long long tmp1 = a * c, tmp2 = a * d, tmp3 = b * c, tmp4 = b * d;
    vector<long long> v;
    v.push_back(tmp1);
    v.push_back(tmp2);
    v.push_back(tmp3);
    v.push_back(tmp4);
    cout << *max_element(v.begin(), v.end()) << endl;
 }


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

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

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


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

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

int main(){
  int a,b , c , d; 
  int prosuits[4]={0};
  cin>>a>>b>>c>>d;
  produits[0]=a*c;
  produits[1]=a*d;
  produits[2]=b*c;
  produits[3]=b*d;
  sort(produits,produits+4);
  cout<<produits[3]<<endl;
}

Compiler output:
a.cc:2:2: error: invalid preprocessing directive #inlude; did you mean #include?
    2 | #inlude<algorithm>
      |  ^~~~~~
      |  include
a.cc: In function 'int main()':
a.cc:9:3: error: 'produits' was not declared in this scope; did you mean 'prosuits'?
    9 |   produits[0]=a*c;
      |   ^~~~~~~~
      |   prosuits
a.cc:13:3: error: 'sort' was not declared in this scope; did you mean 'short'?
   13 |   sort(produits,produits+4);
      |   ^~~~
      |   short
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  vector<long long> v(4);
  long long largest,a,b,c,d;
  for(int i=0,i<4;i++)
    cin>>v[i];
  a=v[0]*v[2];
  b=v[0]*v[3];
  c=v[1]*v[2];
  d=v[1]*v[3];
  largest= (a>b)?(a>c)?(a>d)?a:d:(c>d)?c:d:(b>c)?(b>d)?b:d:(c>d)?c:d; 
    
    

  cout<<largest;
  return 0;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: expected ';' before '<' token
    6 |   for(int i=0,i<4;i++)
      |                ^
      |                ;
a.cc:6:16: error: expected primary-expression before '<' token
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  vector<long long> v(4);
  long long largest,a,b,c,;
  for(int i=0,i<4;i++)
    cin>>v[i];
  a=v[0]*v[2];
  b=v[0]*v[3];
  c=v[1]*v[2];
  d=v[1]*v[3];
  largest= (a>b)?(a>c)?(a>d)?a:d:(c>d)?c:d:(b>c)?(b>d)?b:d:(c>d)?c:d; 
    
    

  cout<<largest;
  return 0;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:5:27: error: expected unqualified-id before ';' token
    5 |   long long largest,a,b,c,;
      |                           ^
a.cc:6:16: error: expected ';' before '<' token
    6 |   for(int i=0,i<4;i++)
      |                ^
      |                ;
a.cc:6:16: error: expected primary-expression before '<' token
a.cc:11:3: error: 'd' was not declared in this scope
   11 |   d=v[1]*v[3];
      |   ^
Language: C++

#include<bits/stdc++.h>
using namespace std;
int main(){
  vector<long long> v(4);
  long long largest;
  for(int i=0,i<4;i++)
    cin>>v[i];
  a=v[0]*v[2];
  b=v[0]*v[3];
  c=v[1]*v[2];
  d=v[1]*v[3];
  largest= (a>b)?(a>c)?(a>d)?a:d:(c>d)?c:d:(b>c)?(b>d)?b:d:(c>d)?c:d; 
    
    

  cout<<largest;
  return 0;
  }


Compiler output:
a.cc: In function 'int main()':
a.cc:6:16: error: expected ';' before '<' token
    6 |   for(int i=0,i<4;i++)
      |                ^
      |                ;
a.cc:6:16: error: expected primary-expression before '<' token
a.cc:8:3: error: 'a' was not declared in this scope
    8 |   a=v[0]*v[2];
      |   ^
a.cc:9:3: error: 'b' was not declared in this scope
    9 |   b=v[0]*v[3];
      |   ^
a.cc:10:3: error: 'c' was not declared in this scope
   10 |   c=v[1]*v[2];
      |   ^
a.cc:11:3: error: 'd' was not declared in this scope
   11 |   d=v[1]*v[3];
      |   ^
Language: C++

include<bits/stdc++.h>
using namespace std;
int main(){
  long long a,b,c,d,s;
  long long ans=0;
  cin>>a>>b>>c>>d;
  for(int i=a;i<=b;i++){
    for(int j=c;j<=d;j++){
      s=i*j;
    ans=max(ans,s);
      }}
  cout<<ans;
  return 0;
  }


Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |   ^~~
a.cc:10:9: error: 'max' was not declared in this scope
   10 |     ans=max(ans,s);
      |         ^~~
a.cc:12:3: error: 'cout' was not declared in this scope
   12 |   cout<<ans;
      |   ^~~~
Language: C++

include<bits/stdc++.h>
using namespace std;
int main(){
  long  a,b,c,d,s;
  long long ans=0;
  cin>>a>>b>>c>>d;
  for(int i=a;i<=b;i++){
    for(int j=c;j<=d;j++){
      s=i*j;
    ans=max(ans,s);
      }}
  
  return 0;
  }


Compiler output:
a.cc:1:1: error: 'include' does not name a type
    1 | include<bits/stdc++.h>
      | ^~~~~~~
a.cc: In function 'int main()':
a.cc:6:3: error: 'cin' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |   ^~~
a.cc:10:9: error: 'max' was not declared in this scope
   10 |     ans=max(ans,s);
      |         ^~~
Language: C++

#include<stdio.h>
int main()
int x;
{
	scanf("%d",&x)
	if(x==0)printf("1");
}

Compiler output:
a.cc:3:1: error: expected initializer before 'int'
    3 | int x;
      | ^~~
a.cc:4:1: error: expected unqualified-id before '{' token
    4 | {
      | ^
Language: C++

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

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

Compiler output:
a.cc: In function 'int main()':
a.cc:7:18: error: 'mac' was not declared in this scope
    7 |   cout<<max(a,b)*mac(c,d)<<endl;
      |                  ^~~
Language: C++

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

#define F first //pairの一つ目の要素
#define S second //pairの二つ目の要素
#define PB push_back 
#define MP make_pair
//下4つは必要があれば

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: In function 'int main()':
a.cc:18:14: error: no matching function for call to 'max(ll, ll, ll, ll)'
   18 |   cout << max(a*c,a*d,b*c,b*d) << endl;
      |           ~~~^~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:257:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::max(const _Tp&, const _Tp&)'
  257 |     max(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:257:5: note:   candidate expects 2 arguments, 4 provided
/usr/include/c++/14/bits/stl_algobase.h:303:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::max(const _Tp&, const _Tp&, _Compare)'
  303 |     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:303:5: note:   candidate expects 3 arguments, 4 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5706:5: note: candidate: 'template<class _Tp> constexpr _Tp std::max(initializer_list<_Tp>)'
 5706 |     max(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5706:5: note:   candidate expects 1 argument, 4 provided
/usr/include/c++/14/bits/stl_algo.h:5716:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::max(initializer_list<_Tp>, _Compare)'
 5716 |     max(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5716:5: note:   candidate expects 2 arguments, 4 provided
Language: Java

import java.util.*;
public class Main{
	public static void main(String[] args){
    	Scanner s  = new Scanner(System.in);
      	int a = s.nextInt();
      	int b = s.nextInt();
      	int c = s.nextInt();
      	int d = s.nextInt();
      	long res=  1;
        long a1 = a*c;
        long a2 = b*d;
        long a3 = a*d;
      	long a4 = b*c;
      	long res1 = Math.max(a1,a2);
      	long res2 = Math.max(a3,a4);
      	long res = Math.max(res1,res2);
      	System.out.println(Math.max(res,0));
    }
}

Compiler output:
Main.java:16: error: variable res is already defined in method main(String[])
      	long res = Math.max(res1,res2);
      	     ^
1 error
Language: C++

#include<iostream>
using namespace std;

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


Compiler output:
a.cc: In function 'int main()':
a.cc:7:46: error: no matching function for call to 'max(long long int)'
    7 |   long long ans = max(a*c,max(a*d,max(b*c,max(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>
using namespace std;

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

Compiler output:
a.cc: In function 'int main()':
a.cc:5:1: error: 'll' was not declared in this scope
    5 | ll a,b,c,d;
      | ^~
a.cc:6:8: error: 'a' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |        ^
a.cc:6:11: error: 'b' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |           ^
a.cc:6:14: error: 'c' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |              ^
a.cc:6:17: error: 'd' was not declared in this scope
    6 |   cin>>a>>b>>c>>d;
      |                 ^
a.cc:7:5: error: expected ';' before 'ans'
    7 |   ll ans = max(a*c,max(a*d,max(b*c,max(b*d))));
      |     ^~~~
      |     ;
a.cc:8:9: error: 'ans' was not declared in this scope; did you mean 'abs'?
    8 |   cout<<ans;
      |         ^~~
      |         abs