Ai giup minh voi

[ditty1983]

Ai lam giup minh bai nay , minh se hau ta cho 1 chau an kem .
click vao link nay nha http://www.cs.okstate.edu/~cs1113/programs/pgm09.html
thanks
neu duoc thi mail cho minh o dia chi ditty1983@yahoo.com