Day 9 - Cleanup

Cargo.toml

@@ -35,5 +35,9 @@ path = "src/day7/main.rs"
 name = "day8"
 path = "src/day8/main.rs"
 
+[[bin]]
+name = "day9"
+path = "src/day9/main.rs"
+
 [dependencies]
 anyhow = "1.0.100"

src/day9/act.txt

@@ -0,0 +1,496 @@
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src/day9/main.rs

@@ -0,0 +1,193 @@
+use anyhow::Result;
+use std::{fs, ops::Range};
+
+#[derive(Debug, PartialEq, Eq, Hash)]
+struct TilePos {
+    x: i64,
+    y: i64,
+}
+
+impl TilePos {
+    fn area(&self, other: &TilePos) -> u64 {
+        (((self.x - other.x).abs() + 1) * ((self.y - other.y).abs() + 1)) as u64
+    }
+}
+
+impl Into<TilePos> for &str {
+    fn into(self) -> TilePos {
+        let mut niter = self.split(",");
+        let x: i64 = niter.next().unwrap().parse().unwrap();
+        let y: i64 = niter.next().unwrap().parse().unwrap();
+        TilePos { x, y }
+    }
+}
+
+#[derive(Debug)]
+struct Pair<'a> {
+    b1: &'a TilePos,
+    b2: &'a TilePos,
+    area: u64,
+}
+
+impl<'a> Pair<'a> {
+    fn new(b1: &'a TilePos, b2: &'a TilePos) -> Pair<'a> {
+        Pair {
+            b1,
+            b2,
+            area: b1.area(b2),
+        }
+    }
+
+    fn get_x_range(&'a self) -> Range<i64> {
+        match self.b1.x.cmp(&self.b2.x) {
+            std::cmp::Ordering::Equal => panic!("unrechable {:?}", self),
+            std::cmp::Ordering::Less => (self.b1.x + 1)..self.b2.x,
+            std::cmp::Ordering::Greater => (self.b2.x + 1)..self.b1.x,
+        }
+    }
+
+    fn get_y_range(&'a self) -> Range<i64> {
+        match self.b1.y.cmp(&self.b2.y) {
+            std::cmp::Ordering::Equal => panic!("unrechable {:?}", self),
+            std::cmp::Ordering::Less => (self.b1.y + 1)..self.b2.y,
+            std::cmp::Ordering::Greater => (self.b2.y + 1)..self.b1.y,
+        }
+    }
+
+    fn colide(&'a self, other: &'a Pair) -> bool {
+        if self.b1.x == self.b2.x && other.b1.y == other.b2.y {
+            self.get_y_range().contains(&other.b1.y) && other.get_x_range().contains(&self.b1.x)
+        } else if self.b1.y == self.b2.y && other.b1.x == other.b2.x {
+            self.get_x_range().contains(&other.b1.x) && other.get_y_range().contains(&self.b1.y)
+        } else {
+            false
+        }
+    }
+
+    fn as_rect(&self) {
+        println!(
+            "<path style=\"fill:black\" d=\"M{} {} L{} {} L{} {} L{} {}\" count=\"{}\" />",
+            self.b1.x,
+            self.b1.y,
+            self.b2.x,
+            self.b1.y,
+            self.b2.x,
+            self.b2.y,
+            self.b1.x,
+            self.b2.y,
+            self.area
+        );
+    }
+
+    // Usefull for debugging
+    // fn as_line(&self) {
+    //     println!(
+    //         "<line x1=\"{}\" y1=\"{}\" x2=\"{}\" y2=\"{}\" style=\"stroke:yellow;stroke-width:100\" />",
+    //         self.b1.x, self.b1.y, self.b2.x, self.b2.y,
+    //     );
+    // }
+}
+
+fn main() -> Result<()> {
+    let text = fs::read_to_string("src/day9/act.txt")?;
+
+    let boxes: Vec<TilePos> = text
+        .split("\n")
+        .filter(|s| s.len() > 0)
+        .map(|s| s.into())
+        .collect();
+
+    let mut order_pair = Vec::with_capacity(boxes.len() + 1);
+
+    for (i, b1) in boxes.iter().enumerate() {
+        order_pair.push(Pair::new(
+            b1,
+            if i + 1 >= boxes.len() {
+                &boxes[0]
+            } else {
+                &boxes[i + 1]
+            },
+        ))
+    }
+
+    let mut pairs: Vec<Pair> = Vec::with_capacity(boxes.len() * boxes.len());
+
+    for (i, b1) in boxes.iter().enumerate() {
+        for b2 in boxes.iter().skip(i) {
+            pairs.push(Pair::new(b1, b2))
+        }
+    }
+
+    pairs.sort_by(|a, b| a.area.cmp(&b.area));
+
+    let b = pairs.iter().rev().take(1).next().unwrap();
+
+    println!("sol1: {} {:?} {:?}", b.area, b.b1, b.b2);
+
+    'b2: for b in pairs.iter().rev() {
+        // This check sees if there is a point inside the target square
+        // this will probably fail if you have a case like this
+        //         #XXXX#
+        //         X ## X
+        // 				 #X##X#
+        // Lucky we don't tho this could be saved by detecting those and just removing them...
+        let max_x = b.b1.x.max(b.b2.x);
+        let min_x = b.b1.x.min(b.b2.x);
+        let max_y = b.b1.y.max(b.b2.y);
+        let min_y = b.b1.y.min(b.b2.y);
+
+        for p in boxes.iter() {
+            if p.x > min_x && p.x < max_x && p.y > min_y && p.y < max_y {
+                continue 'b2;
+            }
+        }
+        // Raycasting to detect when there is no square but we go outside bounds
+        // this would also fail for the above case
+        //
+        //		1 ->    p
+        //    ↓
+        //            ↑
+        //		t    <- 2
+        //
+        let p = TilePos {
+            x: b.b2.x,
+            y: b.b1.y,
+        };
+        let t = TilePos {
+            x: b.b1.x,
+            y: b.b2.y,
+        };
+        let ray1 = Pair {
+            b1: b.b1,
+            b2: &p,
+            area: 0,
+        };
+        let ray2 = Pair {
+            b1: b.b1,
+            b2: &t,
+            area: 0,
+        };
+        let ray3 = Pair {
+            b1: b.b2,
+            b2: &p,
+            area: 0,
+        };
+        let ray4 = Pair {
+            b1: b.b2,
+            b2: &t,
+            area: 0,
+        };
+
+        for i in order_pair.iter() {
+            if i.colide(&ray1) || i.colide(&ray2) || i.colide(&ray3) || i.colide(&ray4) {
+                continue 'b2;
+            }
+        }
+
+        println!("sol2 = {} {:?}", b.area, b);
+        b.as_rect();
+        break;
+    }
+
+    Ok(())
+}

src/day9/test.txt

@@ -0,0 +1,8 @@
+7,1
+11,1
+11,7
+9,7
+9,5
+2,5
+2,3
+7,3