Day 17

This was a really fun one! Enjoyed making the simulation that is really
a complicated kind of automaton, and enjoyed looking at the automaton
doing its thing in the terminal.

3 files changed, 1652 insertions, 1 deletions

diff --git a/2018/input/17.txt b/2018/input/17.txt
new file mode 100644
index 0000000..d1a645b
--- /dev/null
+++ b/2018/input/17.txt
@@ -0,0 +1,1361 @@
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+x=580, y=1656..1683
+x=454, y=1238..1249
+y=705, x=432..447
+y=833, x=560..568
+x=478, y=1741..1750
+x=548, y=379..383
+x=569, y=484..487
+y=737, x=436..458
+x=426, y=1403..1408
+x=466, y=1143..1169
+x=459, y=1369..1396
+x=507, y=1455..1459
+x=429, y=1374..1395
+x=476, y=595..608
+x=447, y=1020..1026
+x=495, y=1494..1504
+x=549, y=1428..1441
+x=455, y=1087..1098
+x=441, y=1535..1538
+y=44, x=597..599
+y=1439, x=573..590
+y=413, x=414..440
+x=442, y=1490..1496
+x=428, y=1076..1086
+y=1332, x=568..576
+x=473, y=1086..1098
+x=565, y=411..439
+x=459, y=1497..1501
+x=455, y=27..32
+x=583, y=1291..1306
+y=541, x=548..575
+x=586, y=674..700
+x=585, y=1544..1549
+y=1249, x=454..515
+x=544, y=938..942
+y=1688, x=502..504
+y=381, x=504..507
+y=990, x=430..456
+x=544, y=1550..1553
+x=518, y=92..102
+x=456, y=635..644
+y=406, x=554..579
+y=638, x=524..526
+y=1396, x=439..459
+y=290, x=417..444
+x=480, y=725..734
+x=564, y=1647..1650
+y=412, x=588..597
+x=484, y=1614..1625
+y=1640, x=536..543
+x=539, y=417..441
+x=482, y=989..999
+x=502, y=989..999
+x=563, y=145..170
+y=669, x=478..502
+x=595, y=776..799
+x=461, y=1497..1501
+y=1353, x=511..531
+x=468, y=26..32
+x=472, y=1015..1039
+y=828, x=460..463
+y=1755, x=499..508
+x=518, y=1609..1614
+x=543, y=578..580
+x=438, y=1689..1699
+y=487, x=415..433
+x=475, y=1741..1750
+y=641, x=561..567
+y=668, x=460..462
+x=543, y=1614..1640
+y=824, x=519..537
+x=513, y=850..861
+x=504, y=1688..1690
+x=499, y=246..250
+x=579, y=390..406
+x=538, y=929..946
+x=446, y=1328..1337
+x=478, y=868..878
+x=509, y=181..204
+x=559, y=1724..1742
+x=442, y=877..882
+y=1296, x=421..440
+x=443, y=1066..1079
+x=425, y=29..44
+y=268, x=586..597
+y=461, x=562..564
+x=481, y=1380..1403
+y=565, x=474..479
+x=488, y=1614..1625
+y=314, x=516..521
+x=453, y=1288..1292
+x=483, y=1513..1523
+y=189, x=433..444
+x=596, y=1350..1361
+x=550, y=1387..1389
+x=576, y=973..991
+y=285, x=449..452
+y=1041, x=484..504
+x=414, y=400..413
+x=417, y=152..167
+y=1664, x=504..512
+y=374, x=504..507
+x=484, y=357..379
+y=671, x=449..468
+y=1765, x=577..596
+x=488, y=722..731
+x=433, y=460..470
+x=593, y=934..956
+x=415, y=478..487
diff --git a/2018/src/day17.rs b/2018/src/day17.rs
new file mode 100644
index 0000000..3730e60
--- /dev/null
+++ b/2018/src/day17.rs
@@ -0,0 +1,288 @@
+use std::io;
+use std::io::BufRead;
+use std::collections::{VecDeque, BinaryHeap, HashSet};
+use std::cmp;
+use std::iter::{self, Iterator};
+use std::{thread, time};
+
+enum Clay {
+    Horizontal(i32, i32, i32),  // y, x1, x2
+    Vertical(i32, i32, i32),  // x, y1, y2
+}
+
+impl Clay {
+    fn gety<F: Fn(i32, i32) -> i32>(&self, func: &F) -> i32 {
+        match self {
+            &Clay::Horizontal(y, _, _) => y,
+            &Clay::Vertical(_, y1, y2) => func(y1, y2),
+        }
+    }
+
+    fn getx<F: Fn(i32, i32) -> i32>(&self, func: &F) -> i32 {
+        match self {
+            &Clay::Horizontal(_, x1, x2) => func(x1, x2),
+            &Clay::Vertical(x, _, _) => x,
+        }
+    }
+}
+
+#[derive(Copy, Clone, PartialEq, Eq)]
+enum Cell {
+    Sand,
+    Clay,
+    Still,
+    Flow,
+    Source,
+}
+
+impl Cell {
+    fn produces(&self) -> bool {
+        match self {
+            Cell::Flow => true,
+            Cell::Source => true,
+            _ => false,
+        }
+    }
+
+    fn is_wall(&self) -> bool {
+        match self {
+            Cell::Clay => true,
+            Cell::Still => true,
+            _ => false,
+        }
+    }
+
+    fn is_water(&self) -> bool {
+        match self {
+            Cell::Still => true,
+            Cell::Flow => true,
+            Cell::Source => true,
+            _ => false,
+        }
+    }
+
+    fn print(&self) {
+        print!("{}", match self {
+            Cell::Sand => '.',
+            Cell::Clay => '#',
+            Cell::Still => '~',
+            Cell::Flow => '|',
+            Cell::Source => '+',
+        });
+    }
+}
+
+struct Grid {
+    miny: i32, minx: i32,
+    data: Vec<Vec<Cell>>,
+}
+
+impl Grid {
+    fn new(minx: i32, maxx: i32, miny: i32, maxy: i32) -> Self {
+        assert!(minx <= 500 && 500 <= maxx);
+        assert!(miny <= 0 && 0 <= maxy);
+        let data = iter::repeat(vec![Cell::Sand; (maxx - minx + 1) as usize]).take((maxy - miny + 1) as usize).collect::<Vec<_>>();
+        Self { miny, minx, data }
+    }
+
+    fn inrange(&self, x: i32, y: i32) -> bool {
+        self.minx <= x && x < self.minx + self.data[0].len() as i32
+            && self.miny <= y && y < self.miny + self.data.len() as i32
+    }
+
+    fn get(&self, x: i32, y: i32) -> Cell {
+        if self.inrange(x, y) {
+            self.data[(y - self.miny) as usize][(x - self.minx) as usize]
+        } else {
+            Cell::Sand
+        }
+    }
+
+    fn set(&mut self, x: i32, y: i32, value: Cell) {
+        if self.inrange(x, y) {
+            self.data[(y - self.miny) as usize][(x - self.minx) as usize] = value;
+        }
+    }
+
+    fn print(&self) {
+        for y in 0..self.data.len() {
+            for x in 0..self.data[0].len() {
+                self.data[y][x].print();
+            }
+            println!("");
+        }
+    }
+
+    fn print_range(&self, y1: i32, y2: i32, hlx: i32, hly: i32) {
+        for y in 0..self.data.len() {
+            if self.miny + (y as i32) < y1 {
+                continue;
+            }
+            if self.miny + y as i32 >= y2 {
+                break;
+            }
+            for x in 0..self.data[0].len() {
+                if self.minx + x as i32 == hlx && self.miny + y as i32 == hly {
+                    print!("\x1B[45m");
+                }
+                self.data[y][x].print();
+                if self.minx + x as i32 == hlx && self.miny + y as i32 == hly {
+                    print!("\x1B[0m");
+                }
+            }
+            println!("");
+        }
+    }
+}
+
+fn parse(line: &str) -> Clay {
+    let comma = line.find(',').unwrap();
+    let dot = line[comma+4..].find('.').unwrap() + comma + 4;
+    let num1 = line[2..comma].parse().unwrap();
+    let num2 = line[comma+4..dot].parse().unwrap();
+    let num3 = line[dot+2..].parse().unwrap();
+    if &line[..1] == "x" {
+        Clay::Vertical(num1, num2, num3)
+    } else {
+        Clay::Horizontal(num1, num2, num3)
+    }
+}
+
+fn apply_patterns(grid: &mut Grid, (x, y): (i32, i32)) -> Vec<(i32, i32)> {
+    let mut res = Vec::new();
+
+    // P  ->  P
+    // .      |
+    if grid.get(x, y).produces() && grid.get(x, y+1) == Cell::Sand {
+        grid.set(x, y+1, Cell::Flow);
+        res.push((x, y+1));
+    }
+
+    if grid.get(x, y).produces() && grid.get(x, y+1).is_wall() {
+        // P.  ->  P|
+        // W       W
+        if grid.get(x+1, y) == Cell::Sand {
+            grid.set(x+1, y, Cell::Flow);
+            res.push((x+1, y));
+        }
+        // .P  ->  |P
+        //  W       W
+        if grid.get(x-1, y) == Cell::Sand {
+            grid.set(x-1, y, Cell::Flow);
+            res.push((x-1, y));
+        }
+    }
+
+    for dx in &[-1, 1] {
+        // WP···PW  ->  W~···~W
+        //  W···W        W···W
+        if grid.get(x, y).produces() && grid.get(x, y+1).is_wall() && grid.get(x-dx, y).is_wall() {
+            let mut x2 = x + dx;
+            let make_still;
+
+            loop {
+                if grid.get(x2, y).is_wall() {
+                    make_still = true;
+                    break;
+                }
+
+                if !(grid.get(x2, y).produces() && grid.get(x2, y+1).is_wall()) {
+                    make_still = false;
+                    break;
+                }
+
+                x2 += dx;
+            }
+
+            if make_still {
+                x2 = x;
+                while !grid.get(x2, y).is_wall() {
+                    grid.set(x2, y, Cell::Still);
+                    res.push((x2, y-1));
+                    x2 += dx;
+                }
+            }
+        }
+    }
+
+    res
+}
+
+pub fn main<T: BufRead>(reader: T) -> io::Result<(String, String)> {
+    let input = reader.lines().map(|l| parse(&l.unwrap())).collect::<Vec<_>>();
+
+    let miny = input.iter().map(|c| c.gety(&cmp::min)).min().unwrap();
+    let maxy = input.iter().map(|c| c.gety(&cmp::max)).max().unwrap();
+    let minx = input.iter().map(|c| c.getx(&cmp::min)).min().unwrap();
+    let maxx = input.iter().map(|c| c.getx(&cmp::max)).max().unwrap();
+
+    let mut grid = Grid::new(minx - 1, maxx + 1, cmp::min(miny, 0), maxy);
+
+    grid.set(500, 0, Cell::Source);
+
+    for clay in input {
+        match clay {
+            Clay::Horizontal(y, x1, x2) => {
+                for x in x1..x2+1 {
+                    grid.set(x, y, Cell::Clay);
+                }
+            }
+            Clay::Vertical(x, y1, y2) => {
+                for y in y1..y2+1 {
+                    grid.set(x, y, Cell::Clay);
+                }
+            }
+        }
+    }
+
+    let mut queue = BinaryHeap::new();
+    queue.push((0, 500));
+    // let mut queue = VecDeque::new();
+    // queue.push_back((500, 0));
+
+    let mut inqueue = HashSet::new();
+    inqueue.insert((500, 0));
+
+    // grid.print();
+
+    while queue.len() > 0 {
+        let (my, x) = queue.pop().unwrap();
+        inqueue.remove(&(my, x));
+        let pos = (x, -my);
+        // let (x, y) = queue.pop_back().unwrap();
+        // inqueue.remove(&(x, y));
+        // let pos = (x, y);
+
+        for &(x, y) in apply_patterns(&mut grid, pos).iter().filter(|&&(x, y)| grid.inrange(x, y)) {
+            let p = (-y, x);
+            // let p = (x, y);
+            if !inqueue.contains(&p) {
+                queue.push(p);
+                // queue.push_back(p);
+                inqueue.insert(p);
+            }
+        }
+
+        // println!("\x1B[H\x1B[2J");
+        // grid.print_range(pos.1 - 10, pos.1 + 10, pos.0, pos.1);
+        // thread::sleep(time::Duration::from_millis(50));
+        // let mut line = String::new();
+        // io::stdin().read_line(&mut line)?;
+    }
+
+    let part1 =
+        (miny..maxy+1).map(|y|
+            (minx-1..maxx+2).map(|x|
+                grid.get(x, y).is_water() as i32
+            ).sum::<i32>()
+        ).sum::<i32>();
+
+    let part2 =
+        (miny..maxy+1).map(|y|
+            (minx-1..maxx+2).map(|x|
+                (grid.get(x, y) == Cell::Still) as i32
+            ).sum::<i32>()
+        ).sum::<i32>();
+
+    Ok((part1.to_string(), part2.to_string()))
+}
diff --git a/2018/src/main.rs b/2018/src/main.rs
index 4bc8d50..21a77df 100644
--- a/2018/src/main.rs
+++ b/2018/src/main.rs
@@ -21,8 +21,9 @@ mod day13;
 mod day14;
 mod day15;
 mod day16;
+mod day17;
 
-static NUM_DAYS: i32 = 16;
+static NUM_DAYS: i32 = 17;
 
 fn day_switch<T: BufRead>(day: i32, reader: T) -> io::Result<(String, String)> {
     match day {
@@ -42,6 +43,7 @@ fn day_switch<T: BufRead>(day: i32, reader: T) -> io::Result<(String, String)> {
         14 => day14::main(reader),
         15 => day15::main(reader),
         16 => day16::main(reader),
+        17 => day17::main(reader),
         _ => Err(Error::new(ErrorKind::Other, "Invalid day"))
     }
 }