Add 2021/day-01 solution

3 files changed, 2189 insertions, 0 deletions

diff --git a/2021/day-01/README.org b/2021/day-01/README.org
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+#+title: Day 01 - Sonar Sweep
+#+setupfile: ~/.emacs.d/org-templates/level-3.org
+#+html_link_up: ../../index.html#2021
+#+options: toc:1
+#+export_file_name: index
+
+* Puzzle
+
+- This puzzle is taken from: https://adventofcode.com/2021/day/1
+
+You're minding your own business on a ship at sea when the overboard
+alarm goes off! You rush to see if you can help. Apparently, one of the
+Elves tripped and accidentally sent the sleigh keys flying into the
+ocean!
+
+Before you know it, you're inside a submarine the Elves keep ready for
+situations like this. It's covered in Christmas lights (because of
+course it is), and it even has an experimental antenna that should be
+able to track the keys if you can boost its signal strength high enough;
+there's a little meter that indicates the antenna's signal strength by
+displaying 0-50 stars.
+
+Your instincts tell you that in order to save Christmas, you'll need to
+get all fifty stars by December 25th.
+
+Collect stars by solving puzzles. Two puzzles will be made available on
+each day in the Advent calendar; the second puzzle is unlocked when you
+complete the first. Each puzzle grants one star. Good luck!
+
+As the submarine drops below the surface of the ocean, it automatically
+performs a sonar sweep of the nearby sea floor. On a small screen, the
+sonar sweep report (your puzzle input) appears: each line is a
+measurement of the sea floor depth as the sweep looks further and
+further away from the submarine.
+
+For example, suppose you had the following report:
+
+#+begin_src
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263
+#+end_src
+
+This report indicates that, scanning outward from the submarine, the
+sonar sweep found depths of 199, 200, 208, 210, and so on.
+
+The first order of business is to figure out how quickly the depth
+increases, just so you know what you're dealing with - you never know if
+the keys will get carried into deeper water by an ocean current or a
+fish or something.
+
+To do this, count the number of times a depth measurement increases from
+the previous measurement. (There is no measurement before the first
+measurement.) In the example above, the changes are as follows:
+
+#+begin_src
+199 (N/A - no previous measurement)
+200 (increased)
+208 (increased)
+210 (increased)
+200 (decreased)
+207 (increased)
+240 (increased)
+269 (increased)
+260 (decreased)
+263 (increased)
+#+end_src
+
+In this example, there are 7 measurements that are larger than the
+previous measurement.
+
+How many measurements are larger than the previous measurement?
+
+** Part 2
+
+Considering every single measurement isn't as useful as you expected:
+there's just too much noise in the data.
+
+Instead, consider sums of a three-measurement sliding window. Again
+considering the above example:
+
+#+begin_src
+199  A
+200  A B
+208  A B C
+210    B C D
+200  E   C D
+207  E F   D
+240  E F G
+269    F G H
+260      G H
+263        H
+#+end_src
+
+Start by comparing the first and second three-measurement windows. The
+measurements in the first window are marked A (199, 200, 208); their sum
+is 199 + 200 + 208 = 607. The second window is marked B (200, 208, 210);
+its sum is 618. The sum of measurements in the second window is larger
+than the sum of the first, so this first comparison increased.
+
+Your goal now is to count the number of times the sum of measurements in
+this sliding window increases from the previous sum. So, compare A with
+B, then compare B with C, then C with D, and so on. Stop when there
+aren't enough measurements left to create a new three-measurement sum.
+
+In the above example, the sum of each three-measurement window is as
+follows:
+
+#+begin_src
+A: 607 (N/A - no previous sum)
+B: 618 (increased)
+C: 618 (no change)
+D: 617 (decreased)
+E: 647 (increased)
+F: 716 (increased)
+G: 769 (increased)
+H: 792 (increased)
+#+end_src
+
+In this example, there are 5 sums that are larger than the previous sum.
+
+Consider sums of a three-measurement sliding window. How many sums are
+larger than the previous sum?
+
+* Solution
+
+Slurp all the input values by line and store them as integer:
+
+#+begin_src raku
+my Int @inputs = "input".IO.lines>>.Int;
+#+end_src
+
+Loop over the input elements and compare with previous value,
+~$larger-than-previous~ stores the counter. It's pretty straightforward.
+
+#+begin_src raku
+my Int $larger-than-previous = 0;
+
+for (^@inputs.elems).skip -> $idx {
+    $larger-than-previous++ if @inputs[$idx] > @inputs[$idx - 1];
+}
+
+put "Part 1: ", $larger-than-previous;
+#+end_src
+
+** Part 2
+
+Here, we compare the sum of current set (previous 3 inputs) to the
+previous set.
+
+#+begin_src raku
+my Int $larger-than-previous = 0;
+
+for (^@inputs.elems).skip(3) -> $idx {
+    $larger-than-previous++ if @inputs[$idx - 2 .. $idx].sum > @inputs[$idx - 3 .. $idx - 1].sum;
+}
+
+put "Part 2: ", $larger-than-previous;
+#+end_src
diff --git a/2021/day-01/day-01.raku b/2021/day-01/day-01.raku
new file mode 100644
index 0000000..ae77c28
--- /dev/null
+++ b/2021/day-01/day-01.raku
@@ -0,0 +1,23 @@
+#!/usr/bin/env raku
+
+my Int @inputs = "input".IO.lines>>.Int;
+
+{
+    my Int $larger-than-previous = 0;
+
+    for (^@inputs.elems).skip -> $idx {
+        $larger-than-previous++ if @inputs[$idx] > @inputs[$idx - 1];
+    }
+
+    put "Part 1: ", $larger-than-previous;
+}
+
+{
+    my Int $larger-than-previous = 0;
+
+    for (^@inputs.elems).skip(3) -> $idx {
+        $larger-than-previous++ if @inputs[$idx - 2 .. $idx].sum > @inputs[$idx - 3 .. $idx - 1].sum;
+    }
+
+    put "Part 2: ", $larger-than-previous;
+}
diff --git a/2021/day-01/input b/2021/day-01/input
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