#36361:
對角線的點相加 除以2 就是中點
平行四邊形有兩條對角線
只要先判斷重疊的是兩哪個點，在用中點公式換算
// accepted
# include <iostream>
# include <iomanip>
using namespace std;
int main()
{
double a[2],b[2],c[2],d[2];
while (cin >> a[0] >> a[1] >> b[0] >> b[1] >> c[0] >> c[1] >> d[0] >> d[1])
{
if (a[0] == c[0] && a[1] == c[1])
{
cout << fixed << setprecision(3)
<< b[0] + d[0] - a[0] << " " << b[1] + d[1] - a[1] << endl;
}
else if (a[0] == d[0] && a[1] == d[1])
{
cout << fixed << setprecision(3)
<< b[0] + c[0] - a[0] << " " << b[1] + c[1] - a[1] << endl;
}
else if (b[0] == c[0] && b[1] == c[1])
{
cout << fixed << setprecision(3)
<< a[0] + d[0] - b[0] << " " << a[1] + d[1] - b[1] << endl;
}
else if (b[0] == d[0] && b[1] == d[1])
{
cout <<fixed << setprecision(3)
<< a[0] + c[0] - b[0] << " " << a[1] + c[1] - b[1] << endl;
}
}
return 0;
}
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