ONLINE_JUDGE

[rlac]

Hi. Some online judges like SPOJ and TIMUS compile the codes (at least in C++), defining the macro ONLINE_JUDGE, and thus we can use it for execute code only in our PC and not when the code will be running in the judge. I think that COJ should compile defining this macro too.

[george]

Hi. Some online judges like SPOJ and TIMUS compile the codes (at least in C++), defining the macro ONLINE_JUDGE.

Can you post some advances of this??

[rlac]

I use it for manage input/output and see the total time in which run my program, for example, initially my main method is:

Code: Select all

int main()
{
	//Input region
	#ifndef ONLINE_JUDGE
		system("notepad.exe name.in");
		freopen("name.in", "r", stdin);
		FILE * FILE_NAME = freopen("name.out", "w", stdout);
		int TIME = clock();
	#endif

	//Add your code here...

	//Output region
	#ifndef ONLINE_JUDGE
		cout << (clock() - TIME) << endl;
		fclose(FILE_NAME);
		system("notepad.exe name.out");
	#endif
	return 0;
}

[ymondelo20]

Hi. Some online judges like SPOJ and TIMUS compile the codes (at least in C++), defining the macro ONLINE_JUDGE.

Codeforces use that, like this others.

[rlac]

So ...

[george]

it will be include it soon!!!

[mgear]

How do does macros help define? I've seen various judge use it in their compilation: -DONLINE_JUDGE and i know thats for

Code: Select all

#ifdef ONLINE_JUDGE
// code
#endif

but i dont know how that helps.

[kangoonie]

Please define it too in java compilators.
In Codeforces they use:

java.exe -Xmx256M -DONLINE_JUDGE=true -Duser.language=en -Duser.region=US -Duser.variant=US -jar %s

This is useful to do IO redirection to files if we are offline, and to specify standard io if we are in the Online Judge System.