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.
Project Euler: Problem 10, Sum of Primes
Who knows the last digit of pi?
03 - Matrix Variables 6
Area of an equilateral triangle
How many Integers?
Separate even from odd numbers in a vector - without loops
Approximate the cosine function
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