%!PS

% begin included library code
% see https://github.com/Firedrake/postscript-libraries/
/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

/keys { % dict -> array of dict keys
    [ exch
      {
          pop
      } forall
    ]
} bind def

/map { % array proc -> array
    2 dict begin
    /p exch def
    [ exch
      {
          p
      } forall
    ]
} bind def

/quicksort { % [ a c b ] -> [ a b c ]
    1 dict begin
    /arr exch def
    0 arr length 1 sub quicksort.main
    arr
    end
} bind def

/strsplit % (ajbjc) (j) -> [ (a) (b) (c) ]
{
    1 dict begin
    /sep exch def
    [ exch
      {
          dup length 0 eq {
              pop
              exit
          } {
              sep search {
                  exch pop
                  dup length 0 eq {
                      pop
                  } {
                      exch
                  } ifelse
              } {
                  ()
              } ifelse
          } ifelse
      } loop
    ]
    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

/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


% end included library code

/t 0 dict def

(temperature.txt) (r) file dup bytesavailable string readstring pop
(\n) strsplit {
    (,) strsplit /l exch def
    t l 0 get l 1 get cvi put
} forall

/xlt 999 def
t keys { 10 string cvs } map quicksort {
    /k exch def
    t k get xlt gt {
        k =
    } if
    /xlt t k get def
} forall