why this code is not correct?
s = summ(v)
sorry mate, this is unfair for those who actually came up with a compact solution
No need to be sorry.
Personally I think the regexp should be always forbidden.
I used it (and I had never thought about it before) because it seems that everyone is using it.
Make a checkerboard matrix
Swap the first and last columns
Flip the main diagonal of a matrix
Determine Whether an array is empty
Find out missing number from a vector of 9 elements
Triangle of numbers
Approximate the cosine function
Separate even from odd numbers in a vector - without loops
Horizontal matrix sort
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