I am getting a runtime error (other) in CHEFPRES ( december challenge). The code works fine on my laptop as well as on ideone. Please explain meaning of runtime error (other) and why am I getting it
Maybe you can try C++ comppiler instead of C compiler. I cannot help you more, I’m blind without seeing source for such rare error, sorry.
I have seen this error once, it occurs when you are allocating too much global memory… like for example: declaring a global array of length more than 10^7. I can also say so, since the running time of your submission is 0.00 i.e. your program is stopping immediately. Try reducing the space complexity of your code. All the best 
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No. C++ compiler gives compilation error. Can you please tell me what are the most common reasons for getting runtime error (other)?
you may be using something like this :-
int a[100000001];
This line is the problem, its allocating too much memory in static allocation area!you could use malloc() to allocate this memory on the heap.
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I always thought it’s almost the same, but you may try what others said 
I am using a global 2D array of 10001*10001 dimension. Will that cause the error? And as I said, The Code works fine on my laptop and IDEONE.
I am using a global 2D array of 10001*10001 dimension. Will that cause the error? And as I said, The Code works fine on my laptop and IDEONE.
yes it will give errors sometimes… you cannot create arrays of size 10^8… sometimes ideone and codechef may behave differently
Yes this is the reason, using too much memory
Thank You. I used malloc to allocate (n+1) * (n+1) int 2D array and although It worked for the first sub task, it gives SIGSEGV for the second. That means you can not allocate 10001 * 10001 array even with malloc?
No , you cannot allocate that much amount of memory 
SIGSEGV occurs when you are allocating too much memory or you are accessing array elements out of bound .