From: Brett Parker Date: Sun, 6 Dec 2020 19:21:07 +0000 (+0000) Subject: Add summary text for puzzle X-Git-Url: https://git.sommitrealweird.co.uk/advent-of-code-2019.git/commitdiff_plain/bd8cd9fee88a5c95454a5f3c3b0784fc1dfff59e Add summary text for puzzle --- diff --git a/day4/summary.txt b/day4/summary.txt new file mode 100644 index 0000000..95a9bac --- /dev/null +++ b/day4/summary.txt @@ -0,0 +1,37 @@ +--- Day 4: Secure Container --- +You arrive at the Venus fuel depot only to discover it's protected by a password. The Elves had written the password on a sticky note, but someone threw it out. + +However, they do remember a few key facts about the password: + +It is a six-digit number. +The value is within the range given in your puzzle input. +Two adjacent digits are the same (like 22 in 122345). +Going from left to right, the digits never decrease; they only ever increase or stay the same (like 111123 or 135679). +Other than the range rule, the following are true: + +111111 meets these criteria (double 11, never decreases). +223450 does not meet these criteria (decreasing pair of digits 50). +123789 does not meet these criteria (no double). +How many different passwords within the range given in your puzzle input meet these criteria? + +Your puzzle answer was 1033. + +--- Part Two --- +An Elf just remembered one more important detail: the two adjacent matching digits are not part of a larger group of matching digits. + +Given this additional criterion, but still ignoring the range rule, the following are now true: + +112233 meets these criteria because the digits never decrease and all repeated digits are exactly two digits long. +123444 no longer meets the criteria (the repeated 44 is part of a larger group of 444). +111122 meets the criteria (even though 1 is repeated more than twice, it still contains a double 22). +How many different passwords within the range given in your puzzle input meet all of the criteria? + +Your puzzle answer was 670. + +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. + +Your puzzle input was 254032-789860. + +You can also [Share] this puzzle.