Help with 2015 January Contest, Bronze Problem 2. Cow Routing II

Problems and Contests
#1

The solution to the problem is confusing. Can anyone provide a breakdown of the logic for the solution? Thanks

#2

he solution to the problem is a bit complex, but I will try to break it down into the following steps:

  1. First, the function get_defined_constants() is used to get a list of all defined constants.
  2. Then, a loop is used to iterate through the list of constants.
  3. In each iteration of the loop, the substr() function is used to check if the constant starts with the prefix MY_.
  4. If the constant starts with the prefix MY_, the unset() function is used to unset the constant.