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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Agreed although it's only BraceType that needs to derive Eq, not Brace. (And neither needs to derive Show).
No additional cost overhead for calling len twice?
BTW, a cool variation is
from scipy.misc import comb
def find_dup(arr):
return sum(arr) - comb(len(arr),2)
Never saw a semicolon used like that in python?
This comment is hidden because it contains spoiler information about the solution
you mean len(odds) == 1