From 4301b064d443b13854dd42ef8242d20bef548fe9 Mon Sep 17 00:00:00 2001
From: Santo Cariotti <santo@dcariotti.me>
Date: Tue, 5 Dec 2023 19:12:55 +0100
Subject: part 1 of day5

---
 2023/day5/src/lib.rs | 166 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 166 insertions(+)
 create mode 100644 2023/day5/src/lib.rs

(limited to '2023/day5/src')

diff --git a/2023/day5/src/lib.rs b/2023/day5/src/lib.rs
new file mode 100644
index 0000000..aab4feb
--- /dev/null
+++ b/2023/day5/src/lib.rs
@@ -0,0 +1,166 @@
+use std::str::Split;
+
+fn get_data(data: &mut Split<&str>) -> Vec<Vec<i64>> {
+    data.nth(0)
+        .unwrap()
+        .split(':')
+        .nth(1)
+        .unwrap()
+        .trim_start()
+        .split('\n')
+        .map(|x| x.split(' ').map(|y| y.parse::<i64>().unwrap()).collect())
+        .collect()
+}
+
+pub fn part1(input: &str) -> i64 {
+    let mut input = input.trim().split("\n\n");
+
+    let mut seeds: Vec<i64> = input
+        .nth(0)
+        .unwrap()
+        .split(':')
+        .nth(1)
+        .unwrap()
+        .trim()
+        .split(' ')
+        .map(|x| x.parse::<i64>().unwrap())
+        .collect();
+
+    let mut data: Vec<Vec<Vec<i64>>> = vec![];
+    for _ in 0..7 {
+        let x: Vec<Vec<i64>> = get_data(&mut input);
+
+        data.push(x);
+    }
+    // 0 -> seed-to-soil
+    // 1 -> soil-to-fertilizer
+    // 2 -> fertilizer-to-water
+    // 3 -> water-to-light
+    // 4 -> light-to-temperature
+    // 5 -> temperature-to-humidity
+    // 6 -> humidity-to-location
+
+    for d in &data {
+        let mut checked: Vec<i64> = vec![];
+        for i in d {
+            let drs = i[0];
+            let srs = i[1];
+            let incr = i[2];
+
+            for seed in &mut seeds {
+                if !checked.contains(&*seed) && *seed >= srs && *seed <= srs + incr {
+                    *seed = *seed - srs + drs;
+                    checked.push(*seed);
+                }
+            }
+        }
+    }
+
+    let mut res = seeds[0];
+    for seed in seeds {
+        if seed < res {
+            res = seed;
+        }
+    }
+
+    res
+}
+
+pub fn part2(input: &str) -> i64 {
+    let mut input = input.trim().split("\n\n");
+
+    let s: Vec<i64> = input
+        .nth(0)
+        .unwrap()
+        .split(':')
+        .nth(1)
+        .unwrap()
+        .trim()
+        .split(' ')
+        .map(|x| x.parse::<i64>().unwrap())
+        .collect();
+
+    assert_eq!(s.len() % 2, 0);
+    let mut seeds: Vec<i64> = vec![];
+    let mut i = 0;
+    while i < s.len() {
+        for j in s[i] as usize..(s[i] + s[i + 1]) as usize {
+            seeds.push(j as i64);
+        }
+
+        i += 2;
+    }
+    println!("{seeds:?}");
+
+    let mut data: Vec<Vec<Vec<i64>>> = vec![];
+    for _ in 0..7 {
+        let x: Vec<Vec<i64>> = get_data(&mut input);
+
+        data.push(x);
+    }
+    // 0 -> seed-to-soil
+    // 1 -> soil-to-fertilizer
+    // 2 -> fertilizer-to-water
+    // 3 -> water-to-light
+    // 4 -> light-to-temperature
+    // 5 -> temperature-to-humidity
+    // 6 -> humidity-to-location
+
+    for d in &data {
+        let mut checked: Vec<i64> = vec![];
+        for i in d {
+            let drs = i[0];
+            let srs = i[1];
+            let incr = i[2];
+
+            for seed in &mut seeds {
+                if !checked.contains(&*seed) && *seed >= srs && *seed <= srs + incr {
+                    *seed = *seed - srs + drs;
+                    checked.push(*seed);
+                }
+            }
+        }
+    }
+
+    let mut res = seeds[0];
+    for seed in seeds {
+        if seed < res {
+            res = seed;
+        }
+    }
+
+    res
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn example_part1() {
+        let input = include_str!("../example.txt");
+        let result = part1(input);
+        assert_eq!(result, 35);
+    }
+
+    #[test]
+    fn input_part1() {
+        let input = include_str!("../input.txt");
+        let result = part1(input);
+        assert_eq!(result, 251346198);
+    }
+
+    #[test]
+    fn example_part2() {
+        let input = include_str!("../example.txt");
+        let result = part2(input);
+        assert_eq!(result, 46);
+    }
+
+    #[test]
+    fn input_part2() {
+        let input = include_str!("../input.txt");
+        let result = part2(input);
+        assert_eq!(result, 71585);
+    }
+}
-- 
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