adventofcode/2015/day09/problem

Advent of Code

--- Day 9: All in a Single Night ---

   Every year, Santa manages to deliver all of his presents in a single night.

   This year, however, he has some new locations to visit; his elves have
   provided him the distances between every pair of locations. He can start and
   end at any two (different) locations he wants, but he must visit each
   location exactly once. What is the shortest distance he can travel to
   achieve this?

   For example, given the following distances:

 London to Dublin = 464
 London to Belfast = 518
 Dublin to Belfast = 141

   The possible routes are therefore:

 Dublin -> London -> Belfast = 982
 London -> Dublin -> Belfast = 605
 London -> Belfast -> Dublin = 659
 Dublin -> Belfast -> London = 659
 Belfast -> Dublin -> London = 605
 Belfast -> London -> Dublin = 982

   The shortest of these is London -> Dublin -> Belfast = 605, and so the
   answer is 605 in this example.

   What is the distance of the shortest route?

   Your puzzle answer was 251.

--- Part Two ---

   The next year, just to show off, Santa decides to take the route with the
   longest distance instead.

   He can still start and end at any two (different) locations he wants, and he
   still must visit each location exactly once.

   For example, given the distances above, the longest route would be 982 via
   (for example) Dublin -> London -> Belfast.

   What is the distance of the longest route?

   Your puzzle answer was 898.

   Both parts of this puzzle are complete! They provide two gold stars: **

   At this point, you should return to your advent calendar and try another
   puzzle.

   If you still want to see it, you can get your puzzle input.

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