Language: C++

#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;
int W, H, x, y, flag;
double result = 987654321;

int main()
{
    scanf("%d %d %d %d", &W, &H, &x, &y);
    if((H - y) * W == y * W)
        result = min(result, y * W);
    if((W - x) * H == x * H)
        result = min(result, x * H);
    if(W == H && x == y)
        result = min(result, (double)H * W / 2));
    if(x == 0 && y == 0 && W != H)
        result = min(result, (double)H * W / 2));

    if(result == y * W)
        flag++;
    if(result == x * H)
        flag++;
    if(result == (double)H * W / 2)
        flag++;
    flag--;
    if(flag >= 1)
        flag = 1;
    if(result == 987654321)
        flag = 0;
    printf("%0.6lf %d", result, flag);
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:21: error: no matching function for call to 'min(double&, int)'
   12 |         result = min(result, y * W);
      |                  ~~~^~~~~~~~~~~~~~~
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:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:12:21: note:   deduced conflicting types for parameter 'const _Tp' ('double' and 'int')
   12 |         result = min(result, y * W);
      |                  ~~~^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61,
                 from a.cc:3:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:12:21: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
   12 |         result = min(result, y * W);
      |                  ~~~^~~~~~~~~~~~~~~
a.cc:14:21: error: no matching function for call to 'min(double&, int)'
   14 |         result = min(result, x * H);
      |                  ~~~^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:14:21: note:   deduced conflicting types for parameter 'const _Tp' ('double' and 'int')
   14 |         result = min(result, x * H);
      |                  ~~~^~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:14:21: note:   mismatched types 'std::initializer_list<_Tp>' and 'double'
   14 |         result = min(result, x * H);
      |                  ~~~^~~~~~~~~~~~~~~
a.cc:16:48: error: expected ';' before ')' token
   16 |         result = min(result, (double)H * W / 2));
      |                                                ^
      |                                                ;
a.cc:18:48: error: expected ';' before ')' token
   18 |         result = min(result, (double)H * W / 2));
      |                                                ^
      |                                                ;