Cod sursa(job #663983)

Utilizator andreifirstCioara Andrei Ioan andreifirst Data 19 ianuarie 2012 13:17:08
Problema Sortare prin comparare Scor 60
Compilator fpc Status done
Runda Arhiva educationala Marime 0.72 kb
var v:array [1..500000] of longint;
    i, j, n, aux:longint;
    f, g:text;

procedure qsort (st, dr:longint);
var s, d, m:longint;
  begin
  s:=st; d:=dr;
  m:=st+random(dr-st)+1;

  aux:=v[m]; v[m]:=v[st]; v[st]:=aux;

  while s<d do
    begin
    while (v[d]>=aux) and (s<d) do dec (d);
    v[s]:=v[d];
    while (v[s]<=aux) and (s<d) do inc (s);
    v[d]:=v[s];
    end;

  v[s]:=aux;

  if s-st>1 then qsort (st, s-1);
  if dr-s>1 then qsort (s+1, dr);
  end;

begin
assign (f, 'algsort.in'); reset (f);
assign (g, 'algsort.out'); rewrite (g);
randomize;

read (f, n);
for i := 1 to n do read (f, v[i]);

qsort (1, n);

for i := 1 to n do write (g, v[i], ' ');

close (f); close (g);
end.