Re: Puzzle

[Dung Trong Nguyen <nguyen@jaist.ac.jp>]

Vu Nam <musen212@geisya.or.jp> wrote:

> Hi`nh nhu+ kho^ng o^?n. Gia? su+? dda~ bie^'t la`ng A la` no'i
> tha^.t, B no'i do^'i. Ne^'u ho?i "La`ng na`y la` la`ng A a`?": O+? 
> la`ng A :da^n A se~ ga^.t (no'i tha^.t) da^n B cu~ng ga^.t (no'i
> do^'i) Va^.y thi` kho^ng the^? bie^'t ai la` A, ai la` B.  The same
> vo+'i la`ng B.  VN

To^i nghi~ chi. Ho^`ng tra? lo+`i va^.y vi` anh Vinh ho?i:

> Dear all
> Tie^.n the^? xin co' the^m ca^u ho?i :
> Sau ddo' thi` co' 1 ca^u ho?i na`o co' the^? xa'c ddi.nh nguoi tra?
  ^^^^^^^
> lo;`i thuoc la`ng no'i do^'i hay no'i tha^.t khong???

Tuy nhie^n o+? dda^y solution la` trivial vi` ta dda~ bie^'t 2 kha(?ng
ddi.nh ddu'ng: "ngu+o+`i la`ng A no'i tha^.t" va` "ngu+o+`i la`ng B
no'i do^'i".  Chi? ca^`n du`ng mo^.t trong hai kha(?ng ddi.nh ddo'
test ngu+o+`i ddo^'i thoa.i la` xong\.

Cheers, d~