commit ea787daf334f9513d3cd8d7990e32d13e0924f3b
Author: Louis Burda <quent.burda@gmail.com>
Date: Wed, 1 Dec 2021 22:28:23 +0100
Add day 1 solution
Diffstat:
12 files changed, 2226 insertions(+), 0 deletions(-)
diff --git a/.gitignore b/.gitignore
@@ -0,0 +1 @@
+target
diff --git a/.gitmodules b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "aoc-helper"]
+ path = helper
+ url = git@sinitax.com:sinitax/aoc-helper
diff --git a/data/helper/config b/data/helper/config
@@ -0,0 +1,14 @@
+#!/bin/sh
+
+# year you are solving problems for
+export AOCYEAR=2021
+
+# directory you want day directories to be prepared in (format: src/dayN/..)
+export SRCDIR="src"
+
+# specify what files to copy to your day directory on prepare
+export TEMPLATE_DIR="data/helper/template"
+export TEMPLATE_FILES="
+main.rs:main.rs
+"
+
diff --git a/data/helper/init.sh b/data/helper/init.sh
@@ -0,0 +1,9 @@
+#!/bin/bash
+
+REPOROOT=$(git rev-parse --show-toplevel)
+
+ln -sf "$REPOROOT/data/helper/config" "$REPOROOT/helper/data/config"
+
+for f in "$REPOROOT/data/helper/scripts"/*; do
+ ln -sf "$f" "$REPOROOT/helper/scripts"
+done
diff --git a/data/helper/template/main.rs b/data/helper/template/main.rs
@@ -0,0 +1,21 @@
+use std::fs;
+use std::env;
+
+fn main() {
+ let args: Vec<String> = env::args().collect();
+ if args[1] == "1" {
+ part1();
+ } else if args[1] == "2" {
+ part2();
+ } else {
+ eprintln!("No such part\n");
+ }
+}
+
+fn part1() {
+
+}
+
+fn part2() {
+
+}
diff --git a/helper b/helper
@@ -0,0 +1 @@
+Subproject commit 94a615b088590f4395caa932cc1870dc96f9283c
diff --git a/src/01/Cargo.lock b/src/01/Cargo.lock
@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "aoc"
+version = "0.1.0"
diff --git a/src/01/Cargo.toml b/src/01/Cargo.toml
@@ -0,0 +1,7 @@
+[package]
+name = "aoc"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+
diff --git a/src/01/input b/src/01/input
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diff --git a/src/01/part1 b/src/01/part1
@@ -0,0 +1,64 @@
+--- Day 1: Sonar Sweep ---
+
+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 [1m[33mstars[0m.
+
+Your instincts tell you that in order to save Christmas, you'll need to get all [1m[33mfifty
+stars[0m 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
+[1m[33mone star[0m. 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:
+
+199
+200
+208
+210
+200
+207
+240
+269
+260
+263
+
+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 [1m[37mthe number of times a depth measurement increases[0m from the previous
+measurement. (There is no measurement before the first measurement.) In the example above, the
+changes are as follows:
+
+199 (N/A - no previous measurement)
+200 ([1m[37mincreased[0m)
+208 ([1m[37mincreased[0m)
+210 ([1m[37mincreased[0m)
+200 (decreased)
+207 ([1m[37mincreased[0m)
+240 ([1m[37mincreased[0m)
+269 ([1m[37mincreased[0m)
+260 (decreased)
+263 ([1m[37mincreased[0m)
+
+In this example, there are [1m[37m7[0m measurements that are larger than the previous
+measurement.
+
+[1m[37mHow many measurements are larger than the previous measurement?[0m
+
+
diff --git a/src/01/part2 b/src/01/part2
@@ -0,0 +1,45 @@
+--- Part Two ---
+
+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 [1m[37mthree-measurement sliding window[0m. Again considering the
+above example:
+
+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
+
+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 [1m[37mincreased[0m.
+
+Your goal now is to count [1m[37mthe number of times the sum of measurements in this sliding
+window increases[0m 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:
+
+A: 607 (N/A - no previous sum)
+B: 618 ([1m[37mincreased[0m)
+C: 618 (no change)
+D: 617 (decreased)
+E: 647 ([1m[37mincreased[0m)
+F: 716 ([1m[37mincreased[0m)
+G: 769 ([1m[37mincreased[0m)
+H: 792 ([1m[37mincreased[0m)
+
+In this example, there are [1m[37m5[0m sums that are larger than the previous sum.
+
+Consider sums of a three-measurement sliding window. [1m[37mHow many sums are larger than the
+previous sum?[0m
+
+
diff --git a/src/01/src/main.rs b/src/01/src/main.rs
@@ -0,0 +1,54 @@
+use std::fs;
+use std::env;
+
+fn main() {
+ let args: Vec<String> = env::args().collect();
+ if args[1] == "1" {
+ part1();
+ } else if args[1] == "2" {
+ part2();
+ } else {
+ eprintln!("No such part\n");
+ }
+}
+
+fn part1() {
+ let vals : Vec<u32> = fs::read_to_string("input")
+ .expect("no file")
+ .lines()
+ .map(|x| x.parse().expect("no int"))
+ .collect();
+
+ let mut prev : u32 = vals[0];
+ let mut count : u32 = 0;
+
+ for v in vals {
+ if v > prev {
+ count += 1;
+ }
+ prev = v;
+ }
+
+ println!("{}", count);
+}
+
+fn part2() {
+ let vals : Vec<u32> = fs::read_to_string("input")
+ .expect("no file")
+ .lines()
+ .map(|x| x.parse().expect("no int"))
+ .collect();
+
+ let mut prev : Option<u32> = None;
+ let mut count : u32 = 0;
+
+ for i in 0..vals.len()-2 {
+ let sum = vals[i..i+3].iter().sum();
+ if prev != None && sum > prev.expect("wtf") {
+ count += 1;
+ }
+ prev = Some(sum);
+ }
+
+ println!("{}", count);
+}
