194 lines
4.0 KiB
Markdown
194 lines
4.0 KiB
Markdown
# Advent of Code 2021
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The 2021 iteration of Advent of Code. This year I am going to try and accomplish it all on my iPad using GitPod
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## Adding a new day
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When starting to solve for a new day run the following command in the root of the repo where `<day>` is the go lang compatible package name (i.e. `four` or `five`) and `<noun>` represents the item the day's problem revolves around (i.e. `radar` or `bingo`).
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```sh
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./setup.sh <day> <noun>
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```
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After generating a new package update [`main.go`](main.go) to include a `<day>` flag in the switch statement on line 28
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```go
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case "<day>":
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day = <day>.Init("<day>/input.txt")
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```
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## My Solutions
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These solutions are based on my input values provided to me. The inputs I was provided are also included in this repo.
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### Day 1
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```sh
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$ ./aoc2021 --one
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The solution for "one" is:
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There were 1715 increases in depth
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There were 1739 increases in depth when sampling a window
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```
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### Day 2
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```sh
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$ ./aoc2021 --two
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The solution for "two" is:
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Horizontal is 1832, depth is 1172, answer is 2147104
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Horizontal is 1832, depth is 1116059, answer is 2044620088
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```
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### Day 3
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```sh
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$ ./aoc2021 --three
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The solution for "three" is:
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The power rates are gamma: 1143, epsilon: 2952, for 3374136 total
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The oxygen rating is 1909 and CO2 rating is 2322, for a life support rating of 4432698
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```
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### Day 4
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```sh
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$ ./aoc2021 --four
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The solution for "four" is:
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The winning score is 668 on call 66. Final score 44088
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The last winning score is 263 on call 90. Final score 23670
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```
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### Day five
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```sh
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$ ./aoc2021 --five
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The solution for "five" is:
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There are 5585 overlapping vents
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There are 17193 overlapping vents
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```
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### Day six
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```sh
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$ ./aoc2021 --six
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The solution for "six" is:
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After 80 days there are 377263 fish
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After 256 days there are 1695929023803 fish
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```
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### Day seven
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```sh
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$ ./aoc2021 --seven
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The solution for "seven" is:
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Used 357353 fuel to align
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Used 104822130 fuel to align
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```
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### Day eight
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```sh
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$ ./aoc2021 --eight
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The solution for "eight" is:
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There were 476 instances of digits 1, 4, 7, or 8
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The sum of the decoded output values was 1011823
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```
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### Day nine
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```sh
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$ ./aoc2021 --nine
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The solution for "nine" is:
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The sum of the risk level of low points is 439
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The product of the three largest basins is 900900
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```
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### Day ten
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```sh
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$ ./aoc2021 --ten
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The solution for "ten" is:
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The syntax error score is 323613
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The autoComplete score is 3103006161
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```
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### Day eleven
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```sh
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$ ./aoc2021 --eleven
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The solution for "eleven" is:
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There were 1669 flashes after 100 steps
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They all flash on step 351
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```
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### Day twelve
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```sh
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$ ./aoc2021 --twelve
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The solution for "twelve" is:
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Found 5157 paths through the cave system
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Found 144309 paths through the cave system
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```
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### Day thirteen
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```sh
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$ ./aoc2021 --thirteen
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The solution for "thirteen" is:
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There are 837 dots after 1 fold
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#### ### #### ## # # ## # # # #
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# # # # # # # # # # # # # #
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### # # # # ## # #### # #
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# ### # # ## # # # # # # #
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# # # # # # # # # # # # #
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#### # #### ### # # ## # # ##
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This is the activation code
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```
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### Day fourteen
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```sh
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$ ./aoc2021 --fourteen
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The solution for "fourteen" is:
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The result of subtracting the least from most common element quantities is 2988
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The result of subtracting the least from most common element quantities is 3572761917024
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```
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### Day fifteen
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Today's solution is SLLLLLLOOOOOOOWWW (~75 minutes) but correct!
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```sh
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$ ./aoc2021 --fifteen
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The solution for "fifteen" is:
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The total risk of the least risky path is 415
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The total risk of the least risky path is 2864
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```
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### Day sixteen
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```sh
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$ ./aoc2021 --sixteen
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The solution for "sixteen" is:
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The sum of the version numbers is 1012
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The output of the encoded input is 2223947372407
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```
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### Day seventeen
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```sh
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$ ./aoc2021 --seventeen
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The solution for "seventeen" is:
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The max height is 35511
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There are 3282 initial velocities that will hit the target
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```
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### Day eighteen
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```sh
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$ ./aoc2021 --eighteen
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The solution for "eighteen" is:
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The magnitude of the final sum is 4202
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The largest magnitude of any two snail numbers is 4779
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```
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