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.
Find the two most distant points
First N Perfect Squares
sum of non-primes
06 - Matrix Equations 3
Volume of a box
Triangle of numbers
Find the largest number
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