%!PS

% begin included library code
% see https://codeberg.org/Firedrake/postscript-libraries/
/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

/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.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


% end included library code

/numbercollision {
    5 dict begin
    /a exch def
    /dirty true def
    {
        dirty not {
            exit
        } if
        [
            /dirty false def
            /i 0 def
            {
                i 1 add a length gt {
                    exit
                } if
                /std true def
                i 1 add a length lt {
                    a i get 0 gt a i 1 add get 0 lt and {
                        /std false def
                        /ab a i 1 add get abs def
                        a i get ab gt {
                            a i get
                        } {
                            a i get ab lt {
                                a i 1 add get
                            } if
                        } ifelse
                        /i i 2 add def
                        /dirty true def
                    } if
                } if
                std {
                    a i get
                    /i i 1 add def
                } if
            } loop
        ] /a exch def
    } loop
    a
    end
} bind def

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