%!PS

% begin included library code
% see https://github.com/Firedrake/postscript-libraries/
/test.start {
    print (:) print
    /test.pass 0 def
    /test.count 0 def
} bind def

/test {
    /test.count test.count 1 add def
    {
        /test.pass test.pass 1 add def
    } {
        ( ) print
        test.count (....) cvs print
        (-fail) print
    } ifelse
} bind def

/deepeq {
    2 dict begin
    /a exch def
    /b exch def
    a type b type eq {
        a type /dicttype eq {
            a length b length eq {
                <<
                    a {
                        pop
                        true
                    } forall
                    b {
                        pop
                        true
                    } forall
                >>
                true exch
                {
                    pop
                    dup a exch known {
                        dup b exch known {
                            dup a exch get exch b exch get deepeq not {
                                pop false
                            } if
                        } {
                            false
                        } ifelse
                    } {
                        false
                    } ifelse
                } forall
            } {
                false
            } ifelse
        } {
            a type dup /arraytype eq exch /stringtype eq or {
                a length b length eq {
                    true
                    0 1 a length 1 sub {
                        dup a exch get exch b exch get deepeq not {
                            pop false
                            exit
                        } if
                    } for
                } {
                    false
                } ifelse
            } {
                a b eq
            } ifelse
        } ifelse
    } {
        false
    } ifelse
    end
} bind def

/test.end {
    ( ) print
    test.count 0 gt {
        (Passed ) print
        test.pass (...) cvs print
        (/) print
        test.count (...) cvs print
        ( \() print
        test.pass 100 mul test.count idiv (...) cvs print
        (%\)) print
        (\r\n) print
    } if
} bind def


% end included library code

/arithmeticslices {
    6 dict begin
    /l exch def
    [
        l length 3 ge {
            0 1 l length 3 sub {
                /a exch def
                /valid false def
                a 2 add 1 l length 1 sub {
                    /b exch def
                    /v l a b a sub 1 add getinterval def
                    valid not {
                        0 1 v length 3 sub {
                            /i exch def
                            v i 1 add get v i get sub
                            v i 2 add get v i 1 add get sub
                            eq {
                                /valid true def
                                exit
                            } if
                        } for
                    } if
                    valid {
                        v
                    } if
                } for
            } for
        } if
    ]
    end
} bind def

(arithmeticslices) test.start
[1 2 3 4] arithmeticslices [[1 2 3] [1 2 3 4] [2 3 4]] deepeq test
[2] arithmeticslices [] deepeq test
test.end