Initial commit

3 files changed, 410 insertions, 0 deletions

diff --git a/d10/Cargo.toml b/d10/Cargo.toml
new file mode 100644
index 0000000..f900463
--- /dev/null
+++ b/d10/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "d10"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
diff --git a/d10/input.txt b/d10/input.txt
new file mode 100644
index 0000000..d68df01
--- /dev/null
+++ b/d10/input.txt
@@ -0,0 +1,231 @@
+bot 171 gives low to bot 4 and high to bot 84
+bot 1 gives low to bot 117 and high to bot 81
+bot 82 gives low to bot 209 and high to bot 103
+bot 128 gives low to bot 56 and high to bot 91
+value 23 goes to bot 8
+bot 7 gives low to bot 148 and high to bot 22
+bot 179 gives low to bot 91 and high to bot 77
+bot 158 gives low to bot 125 and high to bot 143
+bot 190 gives low to bot 26 and high to bot 100
+bot 32 gives low to output 12 and high to bot 6
+bot 115 gives low to bot 126 and high to bot 38
+bot 101 gives low to bot 202 and high to bot 66
+bot 143 gives low to bot 169 and high to bot 76
+bot 31 gives low to bot 109 and high to bot 95
+bot 103 gives low to bot 9 and high to bot 171
+bot 180 gives low to bot 137 and high to bot 93
+bot 73 gives low to bot 21 and high to bot 19
+bot 91 gives low to bot 18 and high to bot 58
+bot 49 gives low to bot 85 and high to bot 188
+bot 41 gives low to bot 69 and high to bot 203
+bot 10 gives low to bot 31 and high to bot 94
+bot 29 gives low to output 9 and high to bot 164
+bot 44 gives low to bot 194 and high to bot 180
+bot 157 gives low to bot 67 and high to bot 14
+bot 104 gives low to bot 114 and high to bot 149
+bot 183 gives low to bot 201 and high to bot 151
+bot 138 gives low to output 19 and high to bot 37
+bot 21 gives low to bot 98 and high to bot 205
+bot 9 gives low to bot 36 and high to bot 4
+bot 136 gives low to bot 87 and high to bot 196
+bot 99 gives low to output 20 and high to bot 96
+bot 142 gives low to bot 27 and high to bot 116
+bot 42 gives low to bot 118 and high to bot 104
+bot 108 gives low to bot 64 and high to bot 42
+value 7 goes to bot 157
+bot 159 gives low to bot 78 and high to bot 192
+bot 81 gives low to bot 124 and high to bot 3
+bot 148 gives low to bot 96 and high to bot 146
+bot 107 gives low to bot 49 and high to bot 48
+bot 38 gives low to bot 177 and high to bot 200
+value 43 goes to bot 106
+bot 28 gives low to bot 70 and high to bot 79
+bot 172 gives low to bot 106 and high to bot 190
+bot 162 gives low to bot 158 and high to bot 59
+bot 208 gives low to output 4 and high to output 13
+value 47 goes to bot 21
+bot 124 gives low to bot 79 and high to bot 83
+bot 206 gives low to bot 196 and high to bot 55
+bot 17 gives low to bot 65 and high to bot 187
+bot 144 gives low to bot 46 and high to bot 107
+bot 154 gives low to bot 195 and high to bot 78
+bot 106 gives low to bot 72 and high to bot 26
+bot 186 gives low to bot 14 and high to bot 209
+value 67 goes to bot 10
+bot 187 gives low to bot 123 and high to bot 193
+bot 5 gives low to bot 136 and high to bot 206
+bot 166 gives low to bot 61 and high to bot 85
+value 37 goes to bot 32
+bot 198 gives low to bot 76 and high to bot 71
+bot 97 gives low to output 18 and high to bot 129
+bot 139 gives low to bot 108 and high to bot 88
+bot 192 gives low to bot 131 and high to bot 89
+bot 174 gives low to bot 80 and high to bot 127
+bot 92 gives low to bot 11 and high to bot 7
+bot 94 gives low to bot 95 and high to bot 183
+value 5 goes to bot 98
+bot 72 gives low to bot 207 and high to bot 43
+bot 12 gives low to bot 68 and high to bot 195
+bot 156 gives low to bot 89 and high to bot 1
+bot 188 gives low to bot 197 and high to bot 64
+bot 3 gives low to bot 83 and high to bot 105
+bot 77 gives low to bot 58 and high to bot 41
+bot 11 gives low to bot 99 and high to bot 148
+bot 55 gives low to bot 45 and high to bot 44
+bot 66 gives low to bot 5 and high to bot 141
+bot 23 gives low to bot 48 and high to bot 139
+bot 18 gives low to bot 39 and high to bot 174
+bot 40 gives low to bot 190 and high to bot 39
+bot 90 gives low to bot 179 and high to bot 36
+bot 196 gives low to bot 92 and high to bot 45
+bot 79 gives low to bot 162 and high to bot 147
+value 2 goes to bot 172
+bot 135 gives low to bot 133 and high to bot 168
+bot 117 gives low to bot 28 and high to bot 124
+bot 118 gives low to bot 13 and high to bot 114
+bot 26 gives low to bot 43 and high to bot 12
+bot 185 gives low to bot 32 and high to bot 34
+value 61 goes to bot 207
+bot 193 gives low to bot 101 and high to bot 132
+bot 16 gives low to bot 186 and high to bot 82
+bot 93 gives low to bot 144 and high to bot 60
+bot 116 gives low to bot 155 and high to bot 57
+bot 39 gives low to bot 100 and high to bot 80
+bot 131 gives low to bot 173 and high to bot 74
+bot 133 gives low to output 11 and high to bot 20
+bot 137 gives low to bot 33 and high to bot 144
+value 11 goes to bot 52
+bot 105 gives low to bot 62 and high to bot 122
+bot 126 gives low to bot 25 and high to bot 177
+bot 78 gives low to bot 75 and high to bot 131
+bot 132 gives low to bot 66 and high to bot 167
+bot 202 gives low to bot 181 and high to bot 5
+bot 27 gives low to bot 163 and high to bot 116
+bot 173 gives low to bot 193 and high to bot 63
+value 41 goes to bot 112
+bot 13 gives low to bot 182 and high to bot 50
+bot 59 gives low to bot 143 and high to bot 198
+bot 123 gives low to bot 200 and high to bot 101
+bot 182 gives low to output 2 and high to bot 97
+bot 112 gives low to bot 8 and high to bot 15
+bot 86 gives low to bot 164 and high to bot 166
+bot 201 gives low to bot 82 and high to bot 151
+bot 62 gives low to bot 198 and high to bot 122
+bot 65 gives low to bot 38 and high to bot 123
+bot 165 gives low to bot 121 and high to bot 110
+bot 197 gives low to bot 37 and high to bot 111
+bot 69 gives low to bot 127 and high to bot 0
+bot 57 gives low to bot 81 and high to bot 3
+bot 168 gives low to bot 20 and high to bot 170
+value 31 goes to bot 31
+bot 6 gives low to output 7 and high to bot 133
+value 3 goes to bot 72
+bot 67 gives low to bot 204 and high to bot 161
+bot 35 gives low to bot 30 and high to bot 11
+bot 14 gives low to bot 161 and high to bot 90
+bot 175 gives low to bot 157 and high to bot 186
+bot 96 gives low to output 1 and high to bot 29
+bot 170 gives low to bot 51 and high to bot 176
+bot 68 gives low to bot 191 and high to bot 17
+bot 209 gives low to bot 90 and high to bot 9
+bot 150 gives low to bot 168 and high to bot 119
+bot 203 gives low to bot 0 and high to bot 27
+bot 2 gives low to output 3 and high to bot 208
+bot 50 gives low to bot 97 and high to bot 24
+bot 161 gives low to bot 128 and high to bot 179
+bot 167 gives low to bot 141 and high to bot 158
+value 73 goes to bot 112
+bot 163 gives low to bot 156 and high to bot 155
+bot 4 gives low to bot 178 and high to bot 84
+bot 147 gives low to bot 59 and high to bot 62
+bot 25 gives low to bot 135 and high to bot 150
+bot 121 gives low to bot 160 and high to bot 110
+bot 169 gives low to bot 44 and high to bot 47
+bot 75 gives low to bot 187 and high to bot 173
+bot 120 gives low to bot 176 and high to bot 87
+bot 177 gives low to bot 150 and high to bot 102
+bot 37 gives low to output 16 and high to bot 134
+bot 149 gives low to bot 24 and high to bot 130
+bot 34 gives low to bot 6 and high to bot 135
+value 71 goes to bot 109
+bot 43 gives low to bot 199 and high to bot 68
+bot 145 gives low to bot 139 and high to bot 88
+bot 84 gives low to bot 140 and high to bot 142
+bot 20 gives low to output 8 and high to bot 51
+bot 95 gives low to bot 16 and high to bot 201
+bot 61 gives low to output 5 and high to bot 138
+bot 83 gives low to bot 147 and high to bot 105
+bot 46 gives low to bot 166 and high to bot 49
+bot 153 gives low to bot 93 and high to bot 160
+bot 71 gives low to bot 152 and high to bot 165
+bot 48 gives low to bot 188 and high to bot 108
+bot 98 gives low to bot 185 and high to bot 184
+bot 70 gives low to bot 167 and high to bot 162
+bot 195 gives low to bot 17 and high to bot 75
+bot 205 gives low to bot 184 and high to bot 126
+bot 24 gives low to bot 129 and high to bot 130
+bot 60 gives low to bot 107 and high to bot 23
+bot 51 gives low to output 6 and high to bot 189
+bot 45 gives low to bot 7 and high to bot 194
+bot 164 gives low to output 0 and high to bot 61
+bot 8 gives low to bot 10 and high to bot 15
+value 19 goes to bot 67
+bot 181 gives low to bot 120 and high to bot 136
+value 13 goes to bot 204
+bot 114 gives low to bot 50 and high to bot 149
+bot 113 gives low to bot 52 and high to bot 56
+bot 30 gives low to output 14 and high to bot 99
+bot 63 gives low to bot 132 and high to bot 70
+bot 80 gives low to bot 154 and high to bot 159
+bot 53 gives low to bot 23 and high to bot 145
+bot 125 gives low to bot 55 and high to bot 169
+bot 56 gives low to bot 40 and high to bot 18
+bot 54 gives low to bot 192 and high to bot 156
+bot 155 gives low to bot 1 and high to bot 57
+bot 102 gives low to bot 119 and high to bot 181
+bot 151 gives low to bot 103 and high to bot 171
+bot 200 gives low to bot 102 and high to bot 202
+bot 0 gives low to bot 54 and high to bot 163
+bot 191 gives low to bot 115 and high to bot 65
+bot 119 gives low to bot 170 and high to bot 120
+bot 207 gives low to bot 73 and high to bot 199
+bot 184 gives low to bot 34 and high to bot 25
+value 59 goes to bot 73
+bot 130 gives low to bot 2 and high to bot 208
+bot 111 gives low to bot 134 and high to bot 13
+bot 15 gives low to bot 94 and high to bot 183
+bot 146 gives low to bot 29 and high to bot 86
+bot 58 gives low to bot 174 and high to bot 69
+bot 189 gives low to output 15 and high to bot 30
+bot 33 gives low to bot 86 and high to bot 46
+bot 100 gives low to bot 12 and high to bot 154
+bot 160 gives low to bot 60 and high to bot 53
+bot 129 gives low to output 17 and high to bot 2
+bot 87 gives low to bot 35 and high to bot 92
+bot 64 gives low to bot 111 and high to bot 118
+bot 134 gives low to output 10 and high to bot 182
+bot 122 gives low to bot 71 and high to bot 165
+bot 178 gives low to bot 41 and high to bot 140
+value 29 goes to bot 175
+bot 19 gives low to bot 205 and high to bot 115
+bot 47 gives low to bot 180 and high to bot 153
+value 17 goes to bot 113
+bot 176 gives low to bot 189 and high to bot 35
+bot 88 gives low to bot 42 and high to bot 104
+bot 199 gives low to bot 19 and high to bot 191
+value 53 goes to bot 185
+bot 22 gives low to bot 146 and high to bot 33
+bot 52 gives low to bot 172 and high to bot 40
+bot 141 gives low to bot 206 and high to bot 125
+bot 152 gives low to bot 153 and high to bot 121
+bot 140 gives low to bot 203 and high to bot 142
+bot 85 gives low to bot 138 and high to bot 197
+bot 89 gives low to bot 74 and high to bot 117
+bot 109 gives low to bot 175 and high to bot 16
+bot 36 gives low to bot 77 and high to bot 178
+bot 76 gives low to bot 47 and high to bot 152
+bot 194 gives low to bot 22 and high to bot 137
+bot 110 gives low to bot 53 and high to bot 145
+bot 74 gives low to bot 63 and high to bot 28
+bot 204 gives low to bot 113 and high to bot 128
+bot 127 gives low to bot 159 and high to bot 54
diff --git a/d10/src/main.rs b/d10/src/main.rs
new file mode 100644
index 0000000..650c146
--- /dev/null
+++ b/d10/src/main.rs
@@ -0,0 +1,173 @@
+// Let the record show that I hated every second of solving this puzzle.
+
+use std::fs;
+
+#[derive(Copy, Clone, Debug)]
+struct Bot {
+    lo: Option<usize>,
+    hi: Option<usize>,
+}
+
+impl Bot {
+    fn new() -> Self {
+        Self { lo: None, hi: None }
+    }
+
+    fn recv_chip(&mut self, val: usize) {
+        if self.lo.is_none() && self.hi.is_none() {
+            self.lo = Some(val);
+        } else if self.lo.is_some() && self.hi.is_none() {
+            let old_lo = self.lo.unwrap();
+            if old_lo < val {
+                self.hi = Some(val);
+            } else {
+                self.lo = Some(val);
+                self.hi = Some(old_lo);
+            }
+        } else if self.lo.is_none() && self.hi.is_some() {
+            let old_hi = self.hi.unwrap();
+            if old_hi > val {
+                self.lo = Some(val);
+            } else {
+                self.lo = Some(old_hi);
+                self.hi = Some(val);
+            }
+        } else if self.lo.is_some() && self.hi.is_some() {
+            // If both slots are occupied, we can't accept any more
+        }
+    }
+
+    fn give_chip_lo(&mut self) -> Option<usize> {
+        let result = self.lo;
+        if result.is_some() {
+            self.lo = None;
+        }
+        result
+    }
+
+    fn give_chip_hi(&mut self) -> Option<usize> {
+        let result = self.hi;
+        if result.is_some() {
+            self.hi = None;
+        }
+        result
+    }
+
+    fn num_chips(&self) -> usize {
+        let mut result = 0;
+
+        if self.lo.is_some() {
+            result += 1;
+        }
+        if self.hi.is_some() {
+            result += 1;
+        }
+
+        result
+    }
+}
+
+fn solve_puzzle(lines: &Vec<&str>, target: (usize, usize)) -> (usize, usize) {
+    let mut bots: Vec<Bot> = [Bot::new()].repeat(300);
+    let mut bins: Vec<Option<usize>> = [None].repeat(300);
+
+    let mut part1 = None;
+    let mut part2 = None;
+
+    let mut ln = 0;
+    // Loop 50k times until a self-consistent state is reached
+    for _i in 0..50000 {
+        let words: Vec<&str> = lines[ln].split_ascii_whitespace().collect();
+
+        // Take chip from input bin
+        if words[0] == "value" {
+            let to: usize = words[5].parse().unwrap();
+            bots[to].recv_chip(words[1].parse().unwrap());
+        }
+
+        // Give chips to other bots or to output bins
+        if words[0] == "bot" {
+            let from: usize = words[1].parse().unwrap();
+
+            // Does the giver have two chips? If not, ignore this line (for now)
+            if bots[from].lo.is_some() && bots[from].hi.is_some() {
+                // Bot/bin indices to give chips to
+                let lo_to: usize = words[6].parse().unwrap();
+                let hi_to: usize = words[11].parse().unwrap();
+
+                // Can the destination accept our chips?
+                let lo_avail =
+                    (words[5] == "bot" && bots[lo_to].num_chips() < 2) || words[5] == "output";
+                let hi_avail =
+                    (words[10] == "bot" && bots[hi_to].num_chips() < 2) || words[10] == "output";
+                if lo_avail && hi_avail {
+                    // Give the low chip
+                    let lo = bots[from].give_chip_lo().unwrap();
+                    if words[5] == "bot" {
+                        bots[lo_to].recv_chip(lo);
+                    } else if words[5] == "output" {
+                        bins[lo_to] = Some(lo); // overwrite
+                    }
+
+                    // Give the high chip
+                    let hi = bots[from].give_chip_hi().unwrap();
+                    if words[10] == "bot" {
+                        bots[hi_to].recv_chip(hi);
+                    } else if words[10] == "output" {
+                        bins[hi_to] = Some(hi); // overwrite
+                    }
+                }
+            }
+        }
+
+        // Which bot ends up comparing the target-valued chips?
+        for j in 0..bots.len() {
+            if bots[j].lo.is_some() && bots[j].lo.unwrap() == target.0 {
+                if bots[j].hi.is_some() && bots[j].hi.unwrap() == target.1 {
+                    part1 = Some(j);
+                }
+            }
+        }
+
+        // What is the product of the chips that end up in output bins 0, 1 and 2?
+        if bins[0].is_some() && bins[1].is_some() && bins[2].is_some() {
+            part2 = Some(bins[0].unwrap() * bins[1].unwrap() * bins[2].unwrap());
+        }
+
+        ln = (ln + 1) % lines.len();
+    }
+
+    (part1.unwrap(), part2.unwrap())
+}
+
+fn main() {
+    // Read instructions from input text file
+    let input = fs::read_to_string("input.txt").unwrap();
+    let lines = input.lines().collect();
+
+    let (part1, part2) = solve_puzzle(&lines, (17, 61));
+
+    // Part 1 gives 101 for me
+    println!("Part 1 solution: {}", part1);
+
+    // Part 2 gives 37789 for me
+    println!("Part 2 solution: {}", part2);
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn part1_example1() {
+        let lines = vec![
+            "value 5 goes to bot 2",
+            "bot 2 gives low to bot 1 and high to bot 0",
+            "value 3 goes to bot 1",
+            "bot 1 gives low to output 1 and high to bot 0",
+            "bot 0 gives low to output 2 and high to output 0",
+            "value 2 goes to bot 2",
+        ];
+        assert_eq!(solve_puzzle(&lines, (2, 5)), (2, 30));
+    }
+}