一堆IKUN知识点
（1）输出前n个catalan数：
program jk;
const maxn=1000;
type arraytype=array[0..maxn] of longint;
var i,j,n:longint;
procedure mul(var h:arraytype;k:longint);
var i:longint;
begin
for i:=0 to maxn do h[i]:=h[i]*k;
for i:=0 to maxn-1 do
begin
h[i+1]:=h[i+1]+h[i] div 10;
h[i]:=h[i] mod 10
end
end;
procedure devide(var h:arraytype;k:longint);
var d,i,r:longint;
begin
r:=0;
for i:=maxn downto 0 do
begin
d:=10*r+h[i];
h[i]:=d div k;
r:=d mod k
end
end;
procedure cat(n:integer);
var i,j:integer;
h:arraytype;
begin
for i:=1 to maxn do h[i]:=0;
h[0]:=1;
for i:=3 to n-1 do
begin
mul(h,4*i-6);
devide(h,i
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