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-rw-r--r--2022/Cargo.toml2
-rw-r--r--2022/day4/Cargo.toml8
-rw-r--r--2022/day4/example.txt6
-rw-r--r--2022/day4/input.txt1000
-rw-r--r--2022/day4/src/lib.rs126
5 files changed, 1141 insertions, 1 deletions
diff --git a/2022/Cargo.toml b/2022/Cargo.toml
index 6de40d5..afacff3 100644
--- a/2022/Cargo.toml
+++ b/2022/Cargo.toml
@@ -1,2 +1,2 @@
[workspace]
-members = ["day1", "day2", "day3"]
+members = ["day1", "day2", "day3", "day4"]
diff --git a/2022/day4/Cargo.toml b/2022/day4/Cargo.toml
new file mode 100644
index 0000000..8842130
--- /dev/null
+++ b/2022/day4/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "day4"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
diff --git a/2022/day4/example.txt b/2022/day4/example.txt
new file mode 100644
index 0000000..9f9e9cf
--- /dev/null
+++ b/2022/day4/example.txt
@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8
diff --git a/2022/day4/input.txt b/2022/day4/input.txt
new file mode 100644
index 0000000..0f2f19d
--- /dev/null
+++ b/2022/day4/input.txt
@@ -0,0 +1,1000 @@
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diff --git a/2022/day4/src/lib.rs b/2022/day4/src/lib.rs
new file mode 100644
index 0000000..e64021b
--- /dev/null
+++ b/2022/day4/src/lib.rs
@@ -0,0 +1,126 @@
+use std::cmp::{max, min};
+use std::convert::From;
+
+#[derive(Debug)]
+struct Range {
+ start: i16,
+ end: i16,
+}
+
+#[derive(Debug)]
+struct Ranges {
+ one: Range,
+ two: Range,
+}
+
+impl From<&str> for Range {
+ fn from(item: &str) -> Self {
+ let dash_idx = item.find("-").expect("Can't find dash, can't parse.");
+ let start: i16 = item[..dash_idx].parse().unwrap();
+ let end: i16 = item[dash_idx + 1..].parse().unwrap();
+
+ Range { start, end }
+ }
+}
+
+impl From<&str> for Ranges {
+ fn from(item: &str) -> Self {
+ let comma_idx = item.find(",").expect("Comma not found, can't parse.");
+
+ Ranges {
+ one: item[..comma_idx].into(),
+ two: item[comma_idx + 1..].into(),
+ }
+ }
+}
+
+impl Ranges {
+ fn are_subset(&self) -> bool {
+ let a = &self.one;
+ let b = &self.two;
+
+ if a.start <= b.start && a.end >= b.end {
+ return true;
+ }
+
+ if b.start <= a.start && b.end >= a.end {
+ return true;
+ }
+
+ false
+ }
+
+ fn are_overlap(&self) -> bool {
+ let a = &self.one;
+ let b = &self.two;
+
+ return min(a.end, b.end) - max(a.start, b.start) >= 0;
+ }
+}
+
+pub fn part1(input: &str) -> u32 {
+ let ranges: Vec<Ranges> = input.trim().lines().map(|x| x.into()).collect();
+ let mut tot: u32 = 0;
+
+ for range in ranges {
+ if range.are_subset() {
+ tot += 1;
+ }
+ }
+
+ tot
+}
+
+pub fn part2(input: &str) -> u32 {
+ let ranges: Vec<Ranges> = input.trim().lines().map(|x| x.into()).collect();
+ let mut tot: u32 = 0;
+
+ for range in ranges {
+ if range.are_subset() || range.are_overlap() {
+ tot += 1;
+ }
+ }
+
+ tot
+}
+
+#[cfg(test)]
+mod tests {
+ use super::*;
+
+ #[test]
+ fn test_example() {
+ let data = include_str!("../example.txt");
+
+ let result = part1(data);
+
+ assert_eq!(result, 2);
+ }
+
+ #[test]
+ fn test_input1() {
+ let data = include_str!("../input.txt");
+
+ let result = part1(data);
+
+ assert_eq!(result, 595);
+ }
+
+ #[test]
+ fn test_example2() {
+ let data = include_str!("../example.txt");
+
+ let result = part2(data);
+
+ assert_eq!(result, 4);
+ }
+
+ #[test]
+ fn test_input2() {
+ let data = include_str!("../input.txt");
+
+ let result = part2(data);
+
+ assert_eq!(result, 952);
+ }
+}