How to reverse array columns?

Question

C++ / C#

How can you reverse the columns of a two-dimensional array?

Answer 1

Since the question is in the topic about C ++, then you are probably not interested in raw arrays and raw loops. Then you can do this:

#include <algorithm>
std::vector<std::vector<int>> arr = {{0,1,2,3},{0,1,2,3},{0,1,2,3}};
std::for_each(arr.begin(), arr.end(), [](auto& row){ std::reverse(row.begin(), row.end()); });

Answer 2

Can be done with loops and brain drops.
If some blas is used to work with two-dimensional arrays, then most likely there is already a ready-made function for this.