i'm totally lost with this!
Find all elements less than 0 or greater than 10 and replace them with NaN
Implement a ROT13 cipher
Count from 0 to N^M in base N.
Energy of a photon
Matrix which contains the values of an other matrix A at the given locations.
Select every other element of a vector
Back and Forth Rows
Which values occur exactly three times?
Test for balanced parentheses
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