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ch-1.ps
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ch-1.ps
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%!PS
% begin included library code
% see https://github.com/Firedrake/postscript-libraries/
/reduce { % array proc -> value
2 dict begin
/p exch def
/a exch def
a 0 get
1 1 a length 1 sub {
a exch get
p
} for
end
} bind def
/quicksort.partition {
3 dict begin
/pivot arr hi lo add 2 idiv get def
/i lo 1 sub def
/j hi 1 add def
{
{
/i i 1 add def
arr i get pivot ge {
exit
} if
} loop
{
/j j 1 sub def
arr j get pivot le {
exit
} if
} loop
i j ge {
j
exit
} if
i j quicksort.swap
} loop
end
} bind def
/test.start {
print (:) print
/test.pass 0 def
/test.count 0 def
} bind def
/listmax {
{ max } reduce
} 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
/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
/quicksort.swap {
2 dict begin
/bi exch def
/ai exch def
arr ai get
arr bi get
arr exch ai exch put
arr exch bi exch put
end
} bind def
/quicksort { % [ a c b ] -> [ a b c ]
1 dict begin
/arr exch def
arr length 0 gt {
0 arr length 1 sub quicksort.main
} if
arr
end
} bind def
/filter { % array proc(bool) -> array
1 dict begin
/p exch def
[ exch
{
dup p not
{
pop
} if
} forall
]
end
} bind def
/quicksort.main { % lo hi -> (null)
3 dict begin
/hi exch def
/lo exch def
/xit false def
lo 0 lt {
/xit true def
} if
hi 0 lt {
/xit true def
} if
lo hi ge {
/xit true def
} if
xit not {
/p quicksort.partition def
lo p quicksort.main
p 1 add hi quicksort.main
} if
end
} bind def
% end included library code
/maxgap {
3 dict begin
quicksort /l exch def
l length 2 lt {
0
} {
[
0 1 l length 2 sub {
/i exch def
l i 1 add get l i get sub
} for
]
dup listmax /lm exch def
{ lm eq } filter length
} ifelse
end
} bind def
(maxgap) test.start
[ 2 5 8 1 ] maxgap 2 eq test
[ 3 ] maxgap 0 eq test
test.end