Hello, I was wondering if there is a way of keeping last n rows of a matrix efficiently in C++, for example for DP?
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Hello, I was wondering if there is a way of keeping last n rows of a matrix efficiently in C++, for example for DP?
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In any language, the simplest approach is to just keep the array as
[n][width]
instead of[height][width]
, and access elements as[row % n][col]
instead of[row][col]
.What if i have something like this and i want to keep last t rows of dp but i am also updating the dp like so?
You have, for example (less lines to keep my comment short):
Transform it to:
Is it any different from what you initially asked?