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For challenges where an exact output is not required but some property must still be fulfilled.
2
votes
f(g(x)) decreases while g(f(x)) increases
Pyth, 34 Bytes
This is just a direct translation of my Python answer.
*-1*2%Q2+*2*QQ<Q0
*-1*2%Q2+*2*QQ>Q0
20
votes
f(g(x)) decreases while g(f(x)) increases
Python, 68 characters
f=lambda x:(1-x%2*2)*(2*x*x+(x<0))
g=lambda x:(1-x%2*2)*(2*x*x+(x>0))
f maps negative numbers to odd numbers and positive numbers to even numbers, and even numbers to positive n …
1
vote
Generate a permutation from the high-water marks
Python 3, 64 bytes
Uses zero-based indexing
f=lambda m,n:sum(([*range(*t)][::-1]for t in zip(m,m[1:]+[n])),[])
5
votes
Injectively saturate bit strings
Python, 51 bytes
lambda n,k,s:sorted(set(range(n))-s)[-sum(s)%(n-k)]
Attempt This Online!
This is based on hyper-neutrino's answer to the 'three other numbers' challenge. Edit: I now believe I have p …