Initial commit

src/day4/main.rs

@@ -0,0 +1,68 @@
+use std::fs::read_to_string;
+
+struct Range {
+    start: u32,
+    end: u32
+}
+
+impl Range {
+    fn new(start: u32 , end: u32) -> Self{
+        Range {start, end}
+    }
+
+    fn contains(&self, number: u32) -> bool {
+        number >= self.start && number <= self.end
+    }
+
+    fn fully_overlap(&self, other: &Range) -> bool {
+        self.contains(other.start) && self.contains(other.end)
+    }
+
+    fn partly_overlap(&self, other: &Range) -> bool {
+        self.contains(other.start) || self.contains(other.end)
+    }
+}
+
+fn main() {
+    let input = read_to_string("day4.txt").unwrap();
+
+    let count = input
+        .split_whitespace()
+        .flat_map(|line| line.split(","))
+        .flat_map(|line_range| line_range.split("-"))
+        .map(|number| number.parse::<u32>().unwrap())
+        .collect::<Vec<_>>()
+        .chunks_exact(2)
+        .map(|chunk| Range::new(chunk[0], chunk[1]))
+        .collect::<Vec<_>>()
+        .chunks_exact(2)
+        .filter_map(|range_pair|{
+            if range_pair[0].fully_overlap(&range_pair[1]) || range_pair[1].fully_overlap(&range_pair[0]) {
+                Some(())
+            }
+            else { None }
+        })
+        .count();
+
+    println!("Task1: {count}");
+
+    let count = input
+        .split_whitespace()
+        .flat_map(|line| line.split(","))
+        .flat_map(|line_range| line_range.split("-"))
+        .map(|number| number.parse::<u32>().unwrap())
+        .collect::<Vec<_>>()
+        .chunks_exact(2)
+        .map(|chunk| Range::new(chunk[0], chunk[1]))
+        .collect::<Vec<_>>()
+        .chunks_exact(2)
+        .filter_map(|range_pair|{
+            if range_pair[0].partly_overlap(&range_pair[1]) || range_pair[1].partly_overlap(&range_pair[0]) {
+                Some(())
+            }
+            else { None }
+        })
+        .count();
+
+    println!("Task2: {count}");
+}