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Could Someone take a look at it. I've been stuck here for more than 4 hours. Please
I'm guessing cache.
Thanks for giving me the problem name. I'll read about it.
Thanks. You are right. Its a cache.
Cache friendliness is one possible reason.
Another reason would be that in Java, memory of a multidimensional array are not allocated in a contiguous block, so
new int[a][2]
would createa
small blocks of memory each contains aint[2]
. In comparison withnew int[2][a]
, that's a lot slower.new int[2*a]
should be faster (but also harder to read)Thanks for the link. You're a savior. :)