From 8bee4a93b13ddb4f37037d1699b982055417a3a8 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Fri, 3 Dec 2021 00:32:07 -0500
Subject: [PATCH] Day 4

---
 input/day4.txt | 601 +++++++++++++++++++++++++++++++++++++++++++++++++
 src/day4.rs    | 121 ++++++++++
 src/main.rs    |   3 +-
 3 files changed, 724 insertions(+), 1 deletion(-)
 create mode 100644 input/day4.txt
 create mode 100644 src/day4.rs

diff --git a/input/day4.txt b/input/day4.txt
new file mode 100644
index 0000000..5338ded
--- /dev/null
+++ b/input/day4.txt
@@ -0,0 +1,601 @@
+63,23,2,65,55,94,38,20,22,39,5,98,9,60,80,45,99,68,12,3,6,34,64,10,70,69,95,96,83,81,32,30,42,73,52,48,92,28,37,35,54,7,50,21,74,36,91,97,13,71,86,53,46,58,76,77,14,88,78,1,33,51,89,26,27,31,82,44,61,62,75,66,11,93,49,43,85,0,87,40,24,29,15,59,16,67,19,72,57,41,8,79,56,4,18,17,84,90,47,25
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diff --git a/src/day4.rs b/src/day4.rs
new file mode 100644
index 0000000..74cfca2
--- /dev/null
+++ b/src/day4.rs
@@ -0,0 +1,121 @@
+pub fn day4() {
+    // let input = r#"
+    // 7,4,9,5,11,17,23,2,0,14,21,24,10,16,13,6,15,25,12,22,18,20,8,19,3,26,1
+
+    // 22 13 17 11  0
+    // 8  2 23  4 24
+    // 21  9 14 16  7
+    // 6 10  3 18  5
+    // 1 12 20 15 19
+
+    // 3 15  0  2 22
+    // 9 18 13 17  5
+    // 19  8  7 25 23
+    // 20 11 10 24  4
+    // 14 21 16 12  6
+
+    // 14 21 17 24  4
+    // 10 16 15  9 19
+    // 18  8 23 26 20
+    // 22 11 13  6  5
+    // 2  0 12  3  7
+    //     "#
+    // .trim();
+
+    let input = include_str!("../input/day4.txt");
+
+    let mut parts = input.split("\n\n");
+    let drawn = parts
+        .next()
+        .unwrap()
+        .split(",")
+        .map(|s| s.parse::<i32>().unwrap());
+    let mut boards: Vec<Board> = parts.map(|b| b.into()).collect();
+
+    let mut found_p1_winner = false;
+    let mut in_progress_indices = (0..boards.len()).collect::<Vec<_>>();
+
+    'outer: for n in drawn {
+        for (i, b) in boards.iter_mut().enumerate() {
+            b.mark(n);
+            if b.is_winner() {
+                if !found_p1_winner {
+                    found_p1_winner = true;
+                    println!("p1: winning board index: {}", i);
+                    println!("p1: winning board score: {}", b.score());
+                    println!("p1: final score: {}", b.score() * n);
+                }
+
+                // boo, just let me remove an element
+                in_progress_indices.retain(|&it| it != i);
+
+                if in_progress_indices.len() == 0 {
+                    println!("p2: last remaining board index: {}", i);
+                    println!("p2: board score: {}", b.score());
+                    println!("p2: final score: {}", b.score() * n);
+                    break 'outer;
+                }
+            }
+        }
+    }
+}
+
+#[derive(Clone)]
+struct Board {
+    numbers: [[i32; 5]; 5],
+    marked: Vec<(usize, usize)>,
+}
+
+impl Board {
+    fn mark(&mut self, n: i32) {
+        for x in 0..5 {
+            for y in 0..5 {
+                if self.numbers[x][y] == n {
+                    self.marked.push((x, y));
+                }
+            }
+        }
+    }
+
+    fn is_winner(&self) -> bool {
+        for i in 0..5 {
+            let mut row = (0..5).map(|y| (i, y));
+            let mut col = (0..5).map(|x| (x, i));
+            if row.all(|pair| self.marked.contains(&pair))
+                || col.all(|pair| self.marked.contains(&pair))
+            {
+                return true;
+            }
+        }
+        false
+    }
+
+    fn score(&self) -> i32 {
+        let mut sum = 0;
+        for x in 0..5 {
+            for y in 0..5 {
+                if !self.marked.contains(&(x, y)) {
+                    sum += self.numbers[x][y];
+                }
+            }
+        }
+        sum
+    }
+}
+
+impl From<&str> for Board {
+    fn from(str: &str) -> Self {
+        let mut numbers = [[0; 5]; 5];
+        for (i, line) in str.lines().enumerate() {
+            let mut row = [0; 5];
+            for (j, num) in line.split_whitespace().enumerate() {
+                row[j] = num.parse().unwrap();
+            }
+            numbers[i] = row;
+        }
+        Self {
+            numbers,
+            marked: vec![],
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 06ffbba..1175b7d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -3,7 +3,8 @@
 mod day1;
 mod day2;
 mod day3;
+mod day4;
 
 fn main() {
-    day3::day3();
+    day4::day4();
 }