Problem 2, week 4

Score “-1” means a major mistake, will bring penalty factor 0.8 (once a fully correct solution is submitted).
Score “-0.5” means a minor mistake, will bring penalty factor 0.9 (once a fully correct solution is submitted).
Score “-0.25” means a self-corrected minor mistake (withdrawal of the solution), and will bring penalty factor 0.95 (once a fully correct solution is submitted).
Score “0” means that answer was submitted, but full solution wasn’t, and will bring penalty factor 0.95 (once a fully correct solution is submitted).

Positive number means that a fully correct solution has been submitted, and denotes the penalty factor (“1” = no penalty); penalties from the previous attempts have been applied, but the result is not multiplied with the base score of 0.9 (due to the publication of the first hints) or 0.8 (due to the publication of the second hints) , etc.