Language: C++

#include <iostream>
#include <vector>
#include<list>
#include <algorithm>
#include <string>
#include <math.h>
#include<map>
#include <utility>
#include <iomanip>
#include<queue>
using namespace std;
#define REP(i,k,n) for(int i=k;i<n;i++)
 
#define INF 1844674407370955161
typedef long long int ll;
#define SIZE_OF_ARRAY(array) (sizeof(array)/sizeof(array[0]))
#define MOD 1000000007

template<typename T>
int vector_finder(std::vector<T> vec, T number) {
  auto itr = std::find(vec.begin(), vec.end(), number);
  size_t index = std::distance( vec.begin(), itr );
  if (index != vec.size()) { // 発見できたとき
    return 1;
  }
  else { // 発見できなかったとき
    return 0;
  }
}

template<typename T>
T gcd(T a,T b){
	if(b>0){
		return gcd(b, a % b);
	}else{
		return a;
	}
}

template<typename T>
T lcm(T a,T b){
	T g = gcd(a, b);
	return a * b / g;
}

void clear( std::queue<pair<int,int> > &q )
{
   std::queue<pair<int,int> > empty;
   std::swap( q, empty );
}
bool IsPrime(int num)
{
    if (num < 2) return false;
    else if (num == 2) return true;
    else if (num % 2 == 0) return false; // 偶数はあらかじめ除く

    double sqrtNum = sqrt(num);
    for (int i = 3; i <= sqrtNum; i += 2)
    {
        if (num % i == 0)
        {
            // 素数ではない
            return false;
        }
    }

    // 素数である
    return true;
}
template<typename T>
std::vector<T> enum_div(T n)//nの約数を列挙
{
	std::vector<T> ret;
	for(T i=1 ; i*i<=n ; ++i)
	{
		if(n%i == 0)
		{
			ret.push_back(i);
			if(i!=1 && i*i!=n)
			{
				ret.push_back(n/i);
			}
		}
	}
	return ret;
}


class DisjointSet{
    public:
        vector<int> rank, p;

        DisjointSet(){
        }

        DisjointSet(int size){
            rank.resize(size, 0);
            p.resize(size, 0);
            for (int i = 0; i < size;i++){
                makeSet(i);
            }
        }
        void makeSet(int x){
            p[x] = x;
            rank[x] = 0;
        }

        bool same(int x,int y){
            return findSet(x) == findSet(y);
        }
        void unite(int x,int y){
            link(findSet(x), findSet(y));
        }
        void link(int x,int y){
            if(rank[x]>rank[y]){
                p[y] = x;
            }else{
                p[x] = y;
                if(rank[x]==rank[y]){
                    rank[y]++;
                }
            }
        }
        int findSet(int x){
            if(x!=p[x]){
                p[x] = findSet(p[x]);
            }
            return p[x];
        }
};

int main()
{
    double W, H, x, y;
    cin >> W >> H >> x >> y;

    if(W==x&&y==H){
        
        double m = (double)W *(double) H / 2;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }else if(x==0&&y==0){
        double m = (double)W *(double) H  / 2;
        cout << fixed;
        cout << setprecision(9) << m <<" "<<0<< endl;
        return 0;
    }else if(x==W&&y==0){
        double m = (double)W *(double) H / 2;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }else if(x==0&&y==H){
        double m =(double)W *(double) H  / 2.0;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }
    else if(x*H==y*W){
        double m =(double)W *(double) H  / 2.0;
        double xx = min(x, W - x)*H;
        double yy = min(y, H - y) * W;
        double ans=max(m,max(xx,yy));

        int num;
        if(m==ans){
            num++;
        }
        if(xx==ans){
            num++;
        }
        if(yy==ans){
            num++;
        }

        if (num > 1)
        {
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<1<<endl;
        }else{
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<0<<endl;
        }
        return 0;
    }
    else if(y*W==H*W-H*x){
        double m =(double)W *(double) H  / 2.0;
        double xx = min(x, W - x)*H;
        double yy = min(y, H - y) * W;
        double ans=max(m,max(xx,yy));

        int num;
        if(m==ans){
            num++;
        }
        if(xx==ans){
            num++;
        }
        if(yy==ans){
            num++;
        }

        if (num > 1)
        {
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<1<<endl;
        }else{
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<0<<endl;
        }
        return 0;
    }
    double xx = min(x, W - x)*H;
    double yy = min(y, H - y) * W;

    if(x==W/2&&xx>=yy){
        cout << fixed;
        cout << setprecision(9);
        cout << xx << " " << 1 << endl;
        return 0;
    }else if(y==H/2&&yy>=xx){
        cout << fixed;
        cout << setprecision(9);
        cout << yy << " " << 1 << endl;
        return 0;
    }
    if(xx==yy){
        cout << fixed;
        cout << setprecision(9);
        cout << xx << " " << 1 << endl;
    }else{
        cout << fixed;
        cout << setprecision(9);
        cout << max(xx, yy) << " " << 0 << endl;
    }
}#include <iostream>
#include <vector>
#include<list>
#include <algorithm>
#include <string>
#include <math.h>
#include<map>
#include <utility>
#include <iomanip>
#include<queue>
using namespace std;
#define REP(i,k,n) for(int i=k;i<n;i++)
 
#define INF 1844674407370955161
typedef long long int ll;
#define SIZE_OF_ARRAY(array) (sizeof(array)/sizeof(array[0]))
#define MOD 1000000007

template<typename T>
int vector_finder(std::vector<T> vec, T number) {
  auto itr = std::find(vec.begin(), vec.end(), number);
  size_t index = std::distance( vec.begin(), itr );
  if (index != vec.size()) { // 発見できたとき
    return 1;
  }
  else { // 発見できなかったとき
    return 0;
  }
}

template<typename T>
T gcd(T a,T b){
	if(b>0){
		return gcd(b, a % b);
	}else{
		return a;
	}
}

template<typename T>
T lcm(T a,T b){
	T g = gcd(a, b);
	return a * b / g;
}

void clear( std::queue<pair<int,int> > &q )
{
   std::queue<pair<int,int> > empty;
   std::swap( q, empty );
}
bool IsPrime(int num)
{
    if (num < 2) return false;
    else if (num == 2) return true;
    else if (num % 2 == 0) return false; // 偶数はあらかじめ除く

    double sqrtNum = sqrt(num);
    for (int i = 3; i <= sqrtNum; i += 2)
    {
        if (num % i == 0)
        {
            // 素数ではない
            return false;
        }
    }

    // 素数である
    return true;
}
template<typename T>
std::vector<T> enum_div(T n)//nの約数を列挙
{
	std::vector<T> ret;
	for(T i=1 ; i*i<=n ; ++i)
	{
		if(n%i == 0)
		{
			ret.push_back(i);
			if(i!=1 && i*i!=n)
			{
				ret.push_back(n/i);
			}
		}
	}
	return ret;
}


class DisjointSet{
    public:
        vector<int> rank, p;

        DisjointSet(){
        }

        DisjointSet(int size){
            rank.resize(size, 0);
            p.resize(size, 0);
            for (int i = 0; i < size;i++){
                makeSet(i);
            }
        }
        void makeSet(int x){
            p[x] = x;
            rank[x] = 0;
        }

        bool same(int x,int y){
            return findSet(x) == findSet(y);
        }
        void unite(int x,int y){
            link(findSet(x), findSet(y));
        }
        void link(int x,int y){
            if(rank[x]>rank[y]){
                p[y] = x;
            }else{
                p[x] = y;
                if(rank[x]==rank[y]){
                    rank[y]++;
                }
            }
        }
        int findSet(int x){
            if(x!=p[x]){
                p[x] = findSet(p[x]);
            }
            return p[x];
        }
};

int main()
{
    double W, H, x, y;
    cin >> W >> H >> x >> y;

    if(W==x&&y==H){
        
        double m = (double)W *(double) H / 2;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }else if(x==0&&y==0){
        double m = (double)W *(double) H  / 2;
        cout << fixed;
        cout << setprecision(9) << m <<" "<<0<< endl;
        return 0;
    }else if(x==W&&y==0){
        double m = (double)W *(double) H / 2;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }else if(x==0&&y==H){
        double m =(double)W *(double) H  / 2.0;
        cout << fixed;
        cout << setprecision(9) << m<<" "<<0<<endl;
        return 0;
    }
    else if(x*H==y*W){
        double m =(double)W *(double) H  / 2.0;
        double xx = min(x, W - x)*H;
        double yy = min(y, H - y) * W;
        double ans=max(m,max(xx,yy));

        int num;
        if(m==ans){
            num++;
        }
        if(xx==ans){
            num++;
        }
        if(yy==ans){
            num++;
        }

        if (num > 1)
        {
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<1<<endl;
        }else{
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<0<<endl;
        }
        return 0;
    }
    else if(y*W==H*W-H*x){
        double m =(double)W *(double) H  / 2.0;
        double xx = min(x, W - x)*H;
        double yy = min(y, H - y) * W;
        double ans=max(m,max(xx,yy));

        int num;
        if(m==ans){
            num++;
        }
        if(xx==ans){
            num++;
        }
        if(yy==ans){
            num++;
        }

        if (num > 1)
        {
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<1<<endl;
        }else{
            cout << fixed;
            cout << setprecision(9) << ans<<" "<<0<<endl;
        }
        return 0;
    }
    double xx = min(x, W - x)*H;
    double yy = min(y, H - y) * W;

    if(x==W/2&&xx>=yy){
        cout << fixed;
        cout << setprecision(9);
        cout << xx << " " << 1 << endl;
        return 0;
    }else if(y==H/2&&yy>=xx){
        cout << fixed;
        cout << setprecision(9);
        cout << yy << " " << 1 << endl;
        return 0;
    }
    if(xx==yy){
        cout << fixed;
        cout << setprecision(9);
        cout << xx << " " << 1 << endl;
    }else{
        cout << fixed;
        cout << setprecision(9);
        cout << max(xx, yy) << " " << 0 << endl;
    }
}

Compiler output:
a.cc:236:2: error: stray '#' in program
  236 | }#include <iostream>
      |  ^
a.cc:236:3: error: 'include' does not name a type
  236 | }#include <iostream>
      |   ^~~~~~~
a.cc:255:5: error: redefinition of 'template<class T> int vector_finder(std::vector<_Tp>, T)'
  255 | int vector_finder(std::vector<T> vec, T number) {
      |     ^~~~~~~~~~~~~
a.cc:20:5: note: 'template<class T> int vector_finder(std::vector<_Tp>, T)' previously declared here
   20 | int vector_finder(std::vector<T> vec, T number) {
      |     ^~~~~~~~~~~~~
a.cc:267:3: error: redefinition of 'template<class T> T gcd(T, T)'
  267 | T gcd(T a,T b){
      |   ^~~
a.cc:32:3: note: 'template<class T> T gcd(T, T)' previously declared here
   32 | T gcd(T a,T b){
      |   ^~~
a.cc:276:3: error: redefinition of 'template<class T> T lcm(T, T)'
  276 | T lcm(T a,T b){
      |   ^~~
a.cc:41:3: note: 'template<class T> T lcm(T, T)' previously declared here
   41 | T lcm(T a,T b){
      |   ^~~
a.cc:281:6: error: redefinition of 'void clear(std::queue<std::pair<int, int> >&)'
  281 | void clear( std::queue<pair<int,int> > &q )
      |      ^~~~~
a.cc:46:6: note: 'void clear(std::queue<std::pair<int, int> >&)' previously defined here
   46 | void clear( std::queue<pair<int,int> > &q )
      |      ^~~~~
a.cc:286:6: error: redefinition of 'bool IsPrime(int)'
  286 | bool IsPrime(int num)
      |      ^~~~~~~
a.cc:51:6: note: 'bool IsPrime(int)' previously defined here
   51 | bool IsPrime(int num)
      |      ^~~~~~~
a.cc:306:16: error: redefinition of 'template<class T> std::vector<_Tp> enum_div(T)'
  306 | std::vector<T> enum_div(T n)//nの約数を列挙
      |                ^~~~~~~~
a.cc:71:16: note: 'template<class T> std::vector<_Tp> enum_div(T)' previously declared here
   71 | std::vector<T> enum_div(T n)//nの約数を列挙
      |                ^~~~~~~~
a.cc:324:7: error: redefinition of 'class DisjointSet'
  324 | class DisjointSet{
      |       ^~~~~~~~~~~
a.cc:89:7: note: previous definition of 'class DisjointSet'
   89 | class DisjointSet{
      |       ^~~~~~~~~~~
a.cc:367:5: error: redefinition of 'int main()'
  367 | int main()
      |     ^~~~
a.cc:132:5: note: 'int main()' previously defined here
  132 | int main()
      |     ^~~~