First test case is invalid. Please fix it.
I have fixed it.
and the fourth...
It must be OK now!
Sort a list of complex numbers based on far they are from the origin.
Reverse the vector
Set some matrix elements to zero
Sum the 'edge' values of a matrix
Bridge and Torch Problem - Minimum time
unique with nan
Write c^3 as sum of two squares a^2+b^2
String permutations on phone keyboard
Create co-occurrence matrix
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