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## Discussion of Problem 1112. Cover

Help me!!!!!!!!!!!!!!
Posted by BYF 9 Nov 2002 18:37
Program P1112;
Type
Coor=Record
X,Y:Integer;
End;
Var
N,I,J,Last,Which:Integer;
Num,Del:Array[1..100] Of Coor;

procedure Sort(l, r: longint);
var
i, j, x: longint;
Y:Coor;
begin
i := l; j := r; x := Num[(l+r) DIV 2].Y;
repeat
while Num[i].Y < x do i := i + 1;
while x < Num[j].Y do j := j - 1;
if i <= j then
begin
y := Num[i]; Num[i] := Num[j]; Num[j] := y;
i := i + 1; j := j - 1;
end;
until i > j;
if l < j then Sort(l, j);
if i < r then Sort(i, r);
end;

Begin
For I:=1 To N Do
Begin
If Num[I].X>Num[I].Y Then
Begin J:=Num[I].X; Num[I].X:=Num[I].Y; Num[I].Y:=J; End;
End;
Sort(1,N);
I:=0;
Last:=0;
Which:=0;
Repeat
Inc(I);
If Num[I].X>=Last Then
Begin Inc(Which); Last:=Num[I].Y; Del[Which]:=Num[I]; End;
Until I=N;
Writeln(Which);
For I:=1 To Which Do Writeln(Del[I].X,' ',Del[I].Y);
End.
Sorry, I found I made a big mistake, and now I get AC!!!
Posted by BYF 9 Nov 2002 18:43