Problem:
Score : 300 points

Problem Statement

There is a rectangle in a coordinate plane. The coordinates of the four vertices are (0,0), (W,0), (W,H), and (0,H).
You are given a point (x,y) which is within the rectangle or on its border. We will draw a straight line passing through (x,y) to cut the rectangle into two parts. Find the maximum possible area of the part whose area is not larger than that of the other. Additionally, determine if there are multiple ways to cut the rectangle and achieve that maximum.

Constraints

1 \leq W,H \leq 10^9

0\leq x\leq W

0\leq y\leq H

All values in input are integers.

Input

Input is given from Standard Input in the following format:

W H x y

Output

Print the maximum possible area of the part whose area is not larger than that of the other, followed by 1 if there are multiple ways to cut the rectangle and achieve that maximum, and 0 otherwise.

The area printed will be judged correct when its absolute or relative error is at most 10^{-9}.

Sample Input 1

2 3 1 2

Sample Output 1

3.000000 0

The line x=1 gives the optimal cut, and no other line does.

Sample Input 2

2 2 1 1

Sample Output 2

2.000000 1

Solution in C++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
#define rep(i,a,b) for(int i=(int)(a);i<(int)(b);++i)
#define rrep(i,a,b) for(int i=(int)(a);i>=(int)(b);--i)
#define fore(i,a) for(auto &i:a)
#define all(a) (a).begin(),(a).end()
#define rall(a) (a).rbegin(),(a).rend()
#define isin(i,a,b) ((a) <= (i) && (i) < (b))
#define uni(a) (a).erase(unique(all(a)),(a).end())
#define fi first
#define se second
#define pb push_back
#define sz(a) (int)(a).size()
#define v(T) vector<T>
#define vv(T) v(v(T))
using namespace std;
using ll  = long long;
using unit= unsigned;
using ull = unsigned long long;
using P   = pair<int,int>;
using vi  = vector<int>;
using vl  = vector<ll>;
using vvi = vector<vi>;
using vp  = vector<P>;
void _main(); int main(){ cin.tie(0); ios::sync_with_stdio(false); _main(); }
template<class T>void YES(T condition){ if(condition) cout << "YES" << endl; else cout << "NO" << endl; }
template<class T>void Yes(T condition){ if(condition) cout << "Yes" << endl; else cout << "No" << endl; }
template<class T>void POSS(T condition){ if(condition) cout << "POSSIBLE" << endl; else cout << "IMPOSSIBLE" << endl; }
template<class T>void Poss(T condition){ if(condition) cout << "Possible" << endl; else cout << "Impossible" << endl; }
template<class T>bool chmax(T &a, const T &b){ if (a<b){ a = b; return 1; } return 0; }
template<class T>bool chmin(T &a, const T &b){ if (b<a){ a = b; return 1; } return 0; }
template<class T>T gcd(T a, T b){ if (b==0){ return a; }else{ return gcd(b, a%b); }}
template<class T>T lcm(T a, T b){ return a / gcd(a, b) * b; }
constexpr double eps = 1e-10;
constexpr int inf = INT_MAX / 2;
constexpr ll infl = 1LL << 60;

void _main() {
  double W, H, x, y;
  cin >> W >> H >> x >> y;

  map<double, int> mp;
  ++mp[min(x*H, (W-x)*H)];
  ++mp[min(y*W, (H-y)*W)];
  if (W == H && (
      x == y
      || x == fabs(H-y)
      || fabs(W-x) == y)) {
    ++mp[x*y/0.5];
  }

  double ans1 = mp.crbegin()->fi;
  int ans2 = (mp.crbegin()->se == 1) ? 0 : 1;
  cout << ans1 << " " << ans2 << endl;
}