TaskForce141's blog

How to make the online judge ignore my custom local header?in C++?
By TaskForce141, history, 6 months ago, In English

I use a header named printContainer.h for printing STL containers for debugging purposes, but I always have to comment it out before submission , sometimes I forget and get Compilation error which causes much problem and most importantly every second counts here... my template is like this:

#include <bits/stdc++.h>
#include <iostream>
#include <cmath>
#include<iomanip>
#include<cstring>
#include <queue>
#include "Templates/printContainer.h"

//Rest of the code

please tell me what to do? I heard ifdef or endif works but I couldn't make it work...maybe I am using the wrong way.

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6 months ago, # |
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#ifndef ONLINE_JUDGE
#include "Templates/printContainer.h"
#endif
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6 months ago, # |
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Yeah you need to use ifdef and endif and define some custom macro when compiling:

#ifdef LOCAL
#include "Templates/printContainer.h" 
#endif

And now whenever you're compiling you use

g++ -DLOCAL A.cpp
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    6 months ago, # ^ |
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    can I completely copy this code and submit in cf? and not get CE?

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      6 months ago, # ^ |
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      Yes. This just means that you only include this header if you compile with the macro LOCAL, which is not present in the online judge.

      Also I just checked some of the other answers and they might be more convenient because you just compile normally without the need to provide a custom macro (5yearold's answer) so ig you can just use that.

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6 months ago, # |
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see any of my submissions, u need to use #ifndef ONLINE_JUDGE and #endif directives. the code under these directives will not be executed by online judges of platforms like codeforces, atcoder and codechef. hope this helps.

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6 months ago, # |
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#ifndef ONLINE_JUDGE
#include "Templates/printContainer.h"
#else
// define functions defined in template as empty as shown in comments below
// #define debug(...) ; 
// #define crndl ; 
#endif
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