Avoid if statements for checking neighboring indexes in a 2D array

[Ivan Kazmenko via Digitalmars-d-learn]

On Monday, 17 July 2017 at 07:14:26 UTC, Andrea Fontana wrote:

> Probably using ndslice library could help you!

Unfortunately, that's not possible on most online contest 
platforms like Codeforces.  For each programming language and 
compiler available, only the most basic package is usually 
installed on the server.  There is a mix of reasons involved 
(historical, maintenance, choice of libraries, more equality for 
different languages, etc.).  That means, e.g., no numpy for 
Python, no Boost for C++, and no third-party libraries for D.

Ivan Kazmenko.