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## Discussion of Problem 1203. Scientific Conference

Posted by Ural_Huang Shang 12 Feb 2003 18:56
program p1203t;
const maxt=30000;
type arr1=array [0..maxt] of integer;
rec=record ts,te:integer; end;
arr2=array [0..maxt] of rec;
var a:arr1; n:integer; con:arr2;

{\$APPTYPE CONSOLE}

procedure init;
var i,ts,te,j,k:integer; t:arr1;
begin
for i:=1 to n do
begin
if (ts>te) then begin k:=ts; ts:=te; te:=k; end;
if (ts=0) then ts:=-1;
if (t[te]<ts) then t[te]:=ts;
end;
for i:=0 to maxt do
if (t[i]<>0) then
begin
inc(j);
if (t[i]=-1) then t[i]:=0;
con[j].ts:=t[i]; con[j].te:=i;
end;
for i:=0 to maxt do a[i]:=0; n:=j;
end;

procedure solve;
var i,j:integer;
begin
for i:=1 to n do
begin
for j:=(con[i-1].te+1) to con[i].te do a[j]:=a[con[i-1].te];
if (a[con[i].ts-1]+1>a[con[i].te]) then a[con[i].te]:=a[con
[i].ts-1]+1;
end;
end;

procedure sout;
begin
writeln(a[con[n].te]);
end;

begin
init;
solve;
sout;
end.