ดีจัง

ตามไปอ่าน URL นี้ จาก blog ของคุณ Poonlap ชอบมาก

ขอลอกสรุปไว้หน่อย เผื่อเว็บนั้นหายไป :P
1. Don't give the full solution. Instead, limit yourself to the half of the standard answer.
2. Try to explain the beginning in as many details as you can.
3. Give a general description of objectives that must be completed to solve the problem.
4. Try to encourage the user to check the manual or the Internet. I used a word "encourage" instead of "redirect". Keep that in mind, please.
5. If necessary, give some keywords (but not the search phrase!) or hints.