Problem: Sign of permutations

Code: Sign+of+permutations/tails_1643893872

Nibbles version: 0.2 | 0.21 | 0.22 | 0.23 | 0.24 | 0.25 | 1.00

Format: Compact | Simple | +Type | Table | JSON | .nbl (DeBruijn) | .nbl (names)

`* (product):int 
    . (map):[int] 
        `_ (subsequences):[[int]] 
            ~ (auto = 2):auto 
            _ (= ints):[int] 
        / (foldr1):int <--arg( A:[int] ) 
            $ (= A):[int] 
            `$ (signum):int <--arg( C:int B:int ) 
                - (subtract):int 
                    @ (= B):int 
                    (implicit arg = C):int