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Discussion of Problem 1036. Lucky Tickets

I got WA, please help me! Give some test!
Posted by Algorithmus_UA(algorithmus@univ.kiev.ua) 14 Oct 2002 22:39
type
 long = record
              a:array[1..250]of byte;
              l:byte;
        end;
 arr = array[0..530]of long;
 parr = ^arr;

var a:array[1..2]of parr;
    N,M:integer;
procedure add(var a,b:long);
var l,c,k,i:byte;
begin
  k:=0;
  if a.l>b.l then l:=a.l else l:=b.l;
  for i:=1 to l do
  begin
    c:=a.a[i];
    a.a[i]:=(c+b.a[i]+k)mod 10;
    k:=(c+b.a[i]+k)div 10;
  end;
  a.l:=i;
  if k<>0 then
  begin
    inc(a.l);
    a.a[a.l]:=K;
  end;
end;

procedure mul_i(var a:long;b:longint);
var k:longint;c,i:byte;
begin
  k:=0;
  for i:=1 to a.l do
  begin
    c:=a.a[i];
    a.a[i]:=(c*b+k)mod 10;
    k:=(c*b+k)div 10;
  end;
  a.l:=i;
  while k<>0 do
  begin
    inc(a.l);
    a.a[a.l]:=K mod 10;
    k:=k div 10;
  end;
end;

procedure mul(var a:long);
var tmp,_a:long;
    i,j:byte;
begin
  fillchar(tmp,sizeof(tmp),0);
  for i:=1 to a.l do
  begin
    _a:=a;
    mul_i(_a,a.a[i]);
    for j:=_a.l downto 1 do _a.a[j+i-1]:=_a.a[j];
    for j:=1 to i-1 do _a.a[j]:=0;
    _a.l:=_a.l+i-1;
    add(tmp,_a);
  end;
  a:=tmp;
end;
var i,j,k:integer;
    tmp:parr;
begin
{  assign(input,'1036.dat');reset(input);}
  readln(N,M);
  if M mod 2 = 1 then
  begin
    writeln(0);
    halt;
  end else M:=M div 2;
  new(a[1]);new(a[2]);
  fillchar(a[1]^,sizeof(a[1]^),0);
  fillchar(a[2]^,sizeof(a[2]^),0);
  for i:=0 to 9 do begin a[1]^[i].a[1]:=1;a[1]^[i].l:=1;end;
  for i:=2 to N do
  begin
    for j:=0 to M do
    begin
      for k:=0 to 9 do if j-k>=0 then
      begin
        add(a[2]^[j],a[1]^[j-k]);
      end else break;
    end;
    tmp:=a[1];a[1]:=a[2];a[2]:=tmp;
    fillchar(a[2]^,sizeof(a[2]^),0);
  end;
  mul(a[1]^[M]);
  for i:=a[1]^[M].l downto 1 do write(a[1]^[M].a[i]);
  if a[1]^[M].l = 0 then write(0);
  writeln;
  dispose(a[1]);dispose(a[2]);
end.