6 lines
324 B
Factor
6 lines
324 B
Factor
USE: math.vectors
|
|
: accum-left ( seq id quot -- seq ) accumulate nip ; inline
|
|
: accum-right ( seq id quot -- seq ) [ <reversed> ] 2dip accum-left <reversed> ; inline
|
|
: equilibrium-indices ( seq -- inds )
|
|
0 [ + ] [ accum-left ] [ accum-right ] 3bi [ = ] 2map
|
|
V{ } swap dup length iota [ [ suffix ] curry [ ] if ] 2each ;
|