-
Notifications
You must be signed in to change notification settings - Fork 0
/
day05.rs
224 lines (182 loc) · 5.05 KB
/
day05.rs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
use std::ops::Range;
use aoc_runner_derive::{aoc, aoc_generator};
use itertools::Itertools;
use crate::common::{range_intersect, utils::parse_split};
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct IndividualMapper {
source: Range<usize>,
destination: usize,
}
impl IndividualMapper {
fn contains(&self, input: usize) -> Option<usize> {
self.source
.contains(&input)
.then_some(self.destination + input.saturating_sub(self.source.start))
}
}
#[derive(Debug, Clone)]
pub struct GroupMapper {
mappers: Vec<IndividualMapper>,
}
impl GroupMapper {
fn apply_range(
&self,
input: &mut Vec<Range<usize>>,
temp: &mut Vec<Range<usize>>,
output: &mut Vec<Range<usize>>,
) {
for mapper in &self.mappers {
while let Some(range) = input.pop() {
let [before, inter, after] = range_intersect(range, &mapper.source);
if let Some(before) = before {
temp.push(before);
}
if let Some(inter) = inter {
output.push(
(inter.start - mapper.source.start + mapper.destination)
..(inter.end - mapper.source.start + mapper.destination),
);
}
if let Some(after) = after {
temp.push(after);
}
}
std::mem::swap(input, temp);
}
// ranges that don't map
output.append(input);
}
}
fn parse(group: &str) -> GroupMapper {
let mut mappers = vec![];
for line in group.lines().skip(1) {
let (a, b, c) = line
.split(' ')
.map(|x| x.parse::<usize>().unwrap())
.collect_tuple()
.unwrap();
let source = b..(b + c);
mappers.push(IndividualMapper {
source,
destination: a,
});
}
GroupMapper { mappers }
}
#[aoc_generator(day5)]
pub fn generator(input: &str) -> (Vec<usize>, Vec<GroupMapper>) {
let mut groups = input.split("\n\n");
let (_, seeds_s) = groups.next().unwrap().split_once(':').unwrap();
let seeds = parse_split(seeds_s.trim(), ' ');
let gm = groups.map(parse).collect();
(seeds, gm)
}
fn solve(seeds: impl IntoIterator<Item = usize>, mappers: &[GroupMapper]) -> usize {
seeds
.into_iter()
.map(|seed| {
mappers.iter().fold(seed, |seed, gm| {
gm.mappers
.iter()
.find_map(|mapper| mapper.contains(seed))
.unwrap_or(seed)
})
})
.min()
.unwrap()
}
#[aoc(day5, part1)]
pub fn part1((seeds, mappers): &(Vec<usize>, Vec<GroupMapper>)) -> usize {
solve(seeds.iter().copied(), mappers)
}
#[aoc(day5, part2)]
pub fn part2((seeds_range, mappers): &(Vec<usize>, Vec<GroupMapper>)) -> usize {
let mut temp = vec![];
let mut output = vec![];
let mut input = vec![];
seeds_range
.chunks(2)
.map(|pair| {
input.push(pair[0]..(pair[0] + pair[1]));
for m in mappers {
m.apply_range(&mut input, &mut temp, &mut output);
std::mem::swap(&mut input, &mut output);
}
let min = input.iter().map(|x| x.start).min().unwrap();
input.clear();
min
})
.min()
.unwrap()
// seeds_range
// .par_chunks(2)
// .map(|x| solve(x[0]..(x[0] + x[1]), mappers))
// .min()
// .unwrap()
}
#[cfg(test)]
mod tests {
use super::*;
const SAMPLE: &str = r"seeds: 79 14 55 13
seed-to-soil map:
50 98 2
52 50 48
soil-to-fertilizer map:
0 15 37
37 52 2
39 0 15
fertilizer-to-water map:
49 53 8
0 11 42
42 0 7
57 7 4
water-to-light map:
88 18 7
18 25 70
light-to-temperature map:
45 77 23
81 45 19
68 64 13
temperature-to-humidity map:
0 69 1
1 0 69
humidity-to-location map:
60 56 37
56 93 4";
#[test]
pub fn input_test() {
println!("{:?}", generator(SAMPLE));
// assert_eq!(generator(SAMPLE), Object());
}
#[test]
pub fn mapper() {
let mapper = IndividualMapper {
source: 50..(50 + 48),
destination: 52,
};
assert_eq!(mapper.contains(79), Some(81));
assert_eq!(mapper.contains(14), None);
assert_eq!(mapper.contains(55), Some(57));
assert_eq!(mapper.contains(13), None);
}
#[test]
pub fn part1_test() {
assert_eq!(part1(&generator(SAMPLE)), 35);
}
#[test]
pub fn part2_test() {
assert_eq!(part2(&generator(SAMPLE)), 46);
}
mod regression {
use super::*;
const INPUT: &str = include_str!("../input/2023/day5.txt");
const ANSWERS: (usize, usize) = (199602917, 2254686);
#[test]
pub fn test() {
let input = INPUT.trim_end_matches('\n');
let output = generator(input);
assert_eq!(part1(&output), ANSWERS.0);
assert_eq!(part2(&output), ANSWERS.1);
}
}
}