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 1016. Cube on the Walk

Why do I get CRASH(ACCESS_VIOLATION)? I don't understand!
Posted by Maigo Akisame 10 Jun 2004 09:24
program ural1016;
const
  top:array[1..6{front},1..6{left}]of byte=
       ((0,4,2,5,3,0),(3,0,6,1,0,4),(5,1,0,0,6,2),
        (2,6,0,0,1,5),(4,0,1,6,0,3),(0,3,5,2,4,0));
var
  side:array[1..6]of integer;{top,front,right,bottom,back,left}
  dist:array['a'..'h',1..8,1..6{front},1..6{left}]of longint;
  q:array[1..10000]of record
    x:char;
    y,f,l:byte;
    pre:integer;
  end;
  sx,tx,x:char;
  sy,ty,y,f,l:byte;
  front,rear,p:integer;
  min:longint;
  route:string;
procedure add(x1:char;y1,f1,l1,cost:byte);
  begin
    if dist[x,y,f,l]+side[cost]>=dist[x1,y1,f1,l1] then exit;

    dist[x1,y1,f1,l1]:=dist[x,y,f,l]+side[cost];
    inc(rear);
    with q[rear] do begin
      x:=x1;y:=y1;f:=f1;l:=l1;pre:=front;
    end;

    if (x1=tx) and (y1=ty) then
      if dist[x1,y1,f1,l1]<min then begin
        min:=dist[x1,y1,f1,l1];
        p:=rear;
      end;
  end;
begin
  for x:='a' to 'h' do
    for y:=1 to 8 do
      for f:=1 to 6 do
        for l:=1 to 6 do
          dist[x,y,f,l]:=maxlongint;
  min:=maxlongint;
  read(sx);read(x);sy:=ord(x)-48;read(x);
  read(tx);read(x);ty:=ord(x)-48;
  readln(side[2],side[5],side[1],side[3],side[6],side[4]);
  dist[sx,sy,2,4]:=side[6];
  front:=0;rear:=1;
  q[1].x:=sx;q[1].y:=sy;q[1].f:=2;q[1].l:=4;
  repeat
    inc(front);
    x:=q[front].x;y:=q[front].y;f:=q[front].f;l:=q[front].l;
    if y<8 then add(x,succ(y),7-top[f,l],l,7-f);{Go up}
    if y>1 then add(x,pred(y),top[f,l],l,f);{Go down}
    if x>'a' then add(pred(x),y,f,top[f,l],l);{Go left}
    if x<'h' then add(succ(x),y,f,7-top[f,l],7-l);{Go right}
  until front=rear;
  write(min);
  route:=' '+q[p].x+chr(48+q[p].y);
  while p>1 do begin
    p:=q[p].pre;
    route:=' '+q[p].x+chr(48+q[p].y)+route;
  end;
  writeln(route);
end.