In my C++ compiler options I determined the highest level of compilation and set the checkbox "Warnings as errors". On my computer this programm is working out fine without any warnings? But on server it always gets CE. Why?

#include <iostream.h>
#include <math.h>
int main()
{
    int AD,AC,BD,BC;
    double x, _x;
    cin >> AD >> AC >> BD >> BC;
    if (fabs(AD*AC - BD*BC) < 0.001)
    {
        cout << "Impossible.";
    }
    else
    {
        double cos_ = (double)(AD*AD + AC*AC - BD*BD - BC*BC) / (double)(2*AD*AC - 2*BD*BC);
        x = sqrt(AD*AD + AC*AC - 2*AD*AC*cos_) * 1000;
        _x = floor(x);
        if (fabs(x - _x) > 0.5)
        {
            x = ceil(x);
        }
        else
        {
            x = _x;
        }
        cout << "Distance is " << x << " km.";
    }
    return 0;
}

Here's an email I received after submitting your code as solution for problem 1000:

Dear Michael Rybak (accepted@ukr.net),

You tried to solve problem 1000 A+B Problem.
Your solution was compiled with the following errors:

c5edc0d2-ca53-4c5a-b65d-18f889e279bd
c5edc0d2-ca53-4c5a-b65d-18f889e279bd(8): error: more than one instance of overloaded function "fabs" matches the argument list:
           function "fabs(double)"
           function "fabs(float)"
           function "fabs(long double)"
           argument types are: (int)
 if (fabs(AD*AC - BD*BC) < 0.001)
     ^

c5edc0d2-ca53-4c5a-b65d-18f889e279bd(28): warning #1: last line of file ends without a newline
 }
  ^

compilation aborted for c5edc0d2-ca53-4c5a-b65d-18f889e279bd (code 2)

Timus Online Judge
http://acm.timus.ru

For example, go to http://www.mingw.org/download.shtml and download the following files (these are enough for sure):

binutils-2.16.91-20060119-1.tar.gz
gcc-core-3.4.5-20060117-1.tar.gz
gcc-g++-3.4.5-20060117-1.tar.gz
mingw-runtime-3.9.tar.gz
w32api-3.6.tar.gz

Extract them all in same folder; no special installation is required. Now use g++.exe for compiling:

g++ program program.cpp

Thank You!