type
list = array[1..21] of longint;

var n,i,w1,w2,d:integer;
w:list;

begin
read(n);
d:=0;
For i:=1 to n do read(w[i]);
If n=1 then begin write(w[1]); halt; end;
For i:=1 to n div 2 do begin
  If w1>w2 then w2:=w2+abs(w[i+d]-w[i+d+1]) else w1:=w1+abs(w[i+d]-w[i+d+1]);
  d:=d+1;
  end;
If n mod 2=0 then write(abs(w1-w2)) else write(w[n]-abs(w1-w2));
end.

1
1
is correct(1).

5
1 8 13 27 14
is correct(3).
Test #5 is correct. Where is the mistake?

Edited by author 08.08.2012 01:02