Full name:  ______Yimeng Xu________
SEAS login: _____xuyimeng_________

Which features did you implement? 
  (list features, or write 'Entire assignment')
Entire assignment
Did you complete any extra-credit tasks? If so, which ones?
  (list extra-credit tasks)
no
Did you personally write _all_ the code you are submitting
(other than code from the course web page)?
  [*] Yes
  [ ] No

Did you copy any code from the Internet, or from classmates?
  [ ] Yes
  [*] No

Did you collaborate with anyone on this assignment?
  [ ] Yes
  [*] No