79 lines
2.6 KiB
Plaintext
79 lines
2.6 KiB
Plaintext
|
Advent of Code
|
||
|
|
|
||
|
|
br0xen 40*
|
||
|
|
|
||
|
|
• [About]
|
||
|
|
• [Stats]
|
||
|
|
• [Leaderboard]
|
||
|
|
• [Settings]
|
||
|
|
• [Log out]
|
||
|
|
|
||
|
|
--- 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.
|
||
|
|
|
||
|
|
You can also [Shareon Twitter Google+ Reddit] this puzzle.
|
||
|
|
|
||
|
|
References
|
||
|
|
|
||
|
|
Visible links
|
||
|
|
. http://adventofcode.com/
|
||
|
|
. http://adventofcode.com/about
|
||
|
|
. http://adventofcode.com/stats
|
||
|
|
. http://adventofcode.com/leaderboard
|
||
|
|
. http://adventofcode.com/settings
|
||
|
|
. http://adventofcode.com/auth/logout
|
||
|
|
. http://adventofcode.com/
|
||
|
|
. http://adventofcode.com/day/9/input
|
||
|
|
. https://twitter.com/intent/tweet?text=I%27ve+completed+%22All+in+a+Single+Night%22+%2D+Day+9+%2D+Advent+of+Code&url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9&related=ericwastl&hashtags=AdventOfCode
|
||
|
|
. https://plus.google.com/share?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9
|
||
|
|
. http://www.reddit.com/submit?url=http%3A%2F%2Fadventofcode%2Ecom%2Fday%2F9&title=I%27ve+completed+%22All+in+a+Single+Night%22+%2D+Day+9+%2D+Advent+of+Code
|