Mercurial > repos > other > adventofcode2023
view day1.txt @ 26:eb6c3a7d2f72
Constrained and more optimised route finding
* Track routes so we can see if we have gone straight for
too long
* Track multiple routes so we can use a non-optimal route to
X if it makes another route to Y through X possible (e.g.
optimal route takes three consecutive steps to X, but then
has to turn, whereas a longer straight earlier and two
consecutive steps to X gives a much better next hop to Y)
* We have a start point, so only include the nodes from the
search front in "unvisited" to avoid looking at lots of
irrelevant nodes
| author | IBBoard <dev@ibboard.co.uk> |
|---|---|
| date | Sun, 17 Dec 2023 20:13:03 +0000 |
| parents | 1e16a25a9553 |
| children |
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--- Day 1: Trebuchet?! --- The newly-improved calibration document consists of lines of text; each line originally contained a specific calibration value that the Elves now need to recover. On each line, the calibration value can be found by combining the first digit and the last digit (in that order) to form a single two-digit number. For example: 1abc2 pqr3stu8vwx a1b2c3d4e5f treb7uchet In this example, the calibration values of these four lines are 12, 38, 15, and 77. Adding these together produces 142. Consider your entire calibration document. What is the sum of all of the calibration values? --- Part Two --- Your calculation isn't quite right. It looks like some of the digits are actually spelled out with letters: one, two, three, four, five, six, seven, eight, and nine also count as valid "digits". Equipped with this new information, you now need to find the real first and last digit on each line. For example: two1nine eightwothree abcone2threexyz xtwone3four 4nineeightseven2 zoneight234 7pqrstsixteen In this example, the calibration values are 29, 83, 13, 24, 42, 14, and 76. Adding these together produces 281. What is the sum of all of the calibration values? Undocumented: A line with "oneight" would become 18, despite the overlap, because "one" is the first number read from the start and "8" is the last number read from the end 😐