ENG  RUSTimus Online Judge
Online Judge
Problems
Authors
Online contests
About Online Judge
Frequently asked questions
Site news
Webboard
Links
Problem set
Submit solution
Judge status
Guide
Register
Update your info
Authors ranklist
Current contest
Scheduled contests
Past contests
Rules
back to board

Discussion of Problem 1169. Pairs

To xyz: I'm sorry to disturb you, but can you please tell me what's now wrong with my program
Posted by shitty.Mishka 19 Dec 2001 04:18
Program Network;
 Const Max=100; Mr=Max*Max Div 2;
 Var i,j,n,k,p,v,st:Longint;
     a,b:Array[0..Mr] Of Longint;
Begin
 a[0]:=0; b[0]:=0;
 For i:=1 To Mr Do Begin
  a[i]:=Max+1;
  For j:=3 To Max Do Begin
   v:=i-j*(j-1) Div 2;
   If v>=0 Then
    If a[v]+j<=a[i] Then Begin
     a[i]:=a[v]+j;
     b[i]:=j;
    End;
  End;
 End;
 Readln(n,k);
 k:=n*(n-1) Div 2 - k;
 If a[k]>n Then
  Writeln(-1)
 Else Begin
  p:=1;
  v:=k;
  While v>0 Do Begin
   st:=p;
   If st<>1 Then
    Writeln('1 ',st);
   For i:=1 To b[v]-1 Do Begin
    Writeln(p,' ',p+1);
    Inc(p);
   End;
   Writeln(p,' ',st);
   Inc(p);
   Dec(v,b[v]*(b[v]-1) Div 2);
  End;
  While p<=n Do Begin
   If p<>1 Then
    Writeln('1 ',p);
   Inc(p);
  End;
 End;
End.
AC at last! Thanks again, xyz!
Posted by shitty.Mishka 19 Dec 2001 04:20