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.
letter yes yes & letter no no
Back to basics 25 - Valid variable names
find the maximum element of the matrix
Create an index-powered vector
03 - Matrix Variables 1
How many Integers?
Find the starting index of a consecutive condition
Find the largest number
How many unique Pythagorean triples?
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