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Cod sursa(job #317936)
// Arhiva educationala - Sortare prin comparare
// Implementare LSD Radix Sort pe 2 biti
// Timp constant n*16
var
n, i, key, k : longint;
v : array[1..500000] of longint;
vKey : array[0..3] of array [0..500000] of longint;
f : text;
buf : array[1..65000] of byte;
begin
assign (f, 'algsort.in');
reset (f);
settextbuf (f, buf);
readln (f, n);
for i := 1 to n do read (f,v[i]);
close (f);
for k := 0 to 30 do
begin
if (k mod 2 = 1) then continue;
vKey[0][0] := 0; vKey[1][0] := 0; vKey[2][0] := 0; vKey[3][0] := 0;
for i := 1 to n do
begin
key := (v[i] shr k) and 3;
inc(vKey[key][0]);
vKey[key][vKey[key][0]]:=v[i];
end;
n := 0;
for key := 0 to 3 do
for i := 1 to vKey[key][0] do
begin
inc (n);
v[n] := vkey[key][i];
end;
end;
assign (f,'algsort.out');
rewrite (f);
for i:=1 to n do write (f,v[i],' ');
close (f);
end.