k-permutations

Vocabulary

math.combinatorics

Definition

IN: math.combinatorics

TUPLE: k-permutations length skip k seq ;

Methods

USING: classes.tuple kernel math.combinatorics ;

M: k-permutations hashcode* tuple-hashcode ;


USING: accessors math.combinatorics sequences ;

M: k-permutations length length>> ; inline


USING: accessors kernel math math.combinatorics
math.combinatorics.private sequences sequences.private ;

M: k-permutations nth-unsafe
    [ skip>> * ] [ seq>> [ permutation-indices ] keep ]
    [ k>> swap [ head ] dip nths-unsafe ] tri ;