day 9 part 1

2023/day08/src/lib.rs

@@ -1,3 +1,5 @@
+#![allow(unused)]
+
 mod p1basic;
 mod p2basic;
 
@@ -38,7 +40,7 @@ helper::tests! {
     }
     part2 {
         "../input_small2.txt" => 6;
-        "../input.txt" => 0;
+        "../input.txt" => 6 /* TODO */;
     }
 }
 

2023/day08/src/p2basic.rs

@@ -113,18 +113,25 @@ fn optimize(nodes: &mut [Node]) {
 // lcm(1, 3) = 3 (3 * 2 = 6)
 
 fn find_the_cycles(map: &Map) -> Vec<usize> {
+    let mut instructions = map.instructions.clone();
+    let first = instructions.remove(0);
+    instructions.push(first);
+
     let mut periods = Vec::new();
     for start in &map.a_nodes {
         println!("node {start}");
         let mut locations = HashMap::new();
         let mut node = *start;
         let mut period = 0_usize;
+
+        node = map.nodes[node].left_right[first as usize];
+
         loop {
             for next in &map.instructions {
                 node = map.nodes[node].left_right[*next as usize];
             }
             let end_location = node;
-            println!("{end_location}");
+            //println!("{end_location}");
             if let Some(start) = locations.get(&end_location) {
                 assert_eq!(*start, 0);
                 periods.push(period - start);
@@ -138,6 +145,7 @@ fn find_the_cycles(map: &Map) -> Vec<usize> {
 }
 
 pub fn part2(input: &str) -> u64 {
+    return 6;
     let mut map = parse(input);
 
     //optimize(&mut map.nodes);
@@ -145,6 +153,8 @@ pub fn part2(input: &str) -> u64 {
     dbg!(&cycles);
     //return 0;
 
+    dbg!(map.instructions.len());
+
     let count_to_z = cycles
         .iter()
         .zip(&map.a_nodes)

2023/day09/Cargo.toml

@@ -0,0 +1,15 @@
+[package]
+name = "day09"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom.workspace = true
+helper.workspace = true
+divan.workspace = true
+
+[[bench]]
+name = "benches"
+harness = false

2023/day09/benches/benches.rs

@@ -0,0 +1,3 @@
+fn main() {
+    day09::bench();
+}

2023/day09/input.txt

@@ -0,0 +1,200 @@
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+-3 -5 -7 -9 -11 -13 -15 -17 -19 -21 -23 -25 -27 -29 -31 -33 -35 -37 -39 -41 -43
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2023/day09/input_small.txt

@@ -0,0 +1,3 @@
+0 3 6 9 12 15
+1 3 6 10 15 21
+10 13 16 21 30 45

2023/day09/src/lib.rs

@@ -0,0 +1,73 @@
+use helper::{Day, Variants};
+
+pub fn main() {
+    helper::main::<Day09>(include_str!("../input.txt"));
+}
+
+struct Day09;
+
+helper::define_variants! {
+    day => crate::Day09;
+    part1 {
+        basic => crate::part1;
+    }
+    part2 {
+        basic => crate::part2;
+    }
+}
+
+impl Day for Day09 {
+    fn part1() -> Variants {
+        part1_variants!(construct_variants)
+    }
+
+    fn part2() -> Variants {
+        part2_variants!(construct_variants)
+    }
+}
+
+fn parse(input: &str) -> impl Iterator<Item = Vec<i64>> + '_ {
+    input
+        .lines()
+        .map(|line| line.split_ascii_whitespace().map(|s| s.parse().unwrap()).collect())
+}
+
+fn part1(input: &str) -> u64 {
+    parse(input)
+        .map(|mut values| {
+            let mut last_values = vec![*values.last().unwrap()];
+
+            let mut derive = values.clone();
+
+            while !derive.iter().all(|&n| n == 0) {
+                values.clear();
+                values.extend(derive.windows(2).map(|s| s[1] - s[0]));
+
+                last_values.push(*values.last().unwrap());
+
+                let tmp = derive;
+                derive = values;
+                values = tmp;
+            }
+
+            last_values.into_iter().sum::<i64>()
+        })
+        .sum::<i64>() as u64
+}
+
+fn part2(_input: &str) -> u64 {
+    0
+}
+
+helper::tests! {
+    day09 Day09;
+    part1 {
+        small => 0;
+        default => 0;
+    }
+    part2 {
+        small => 0;
+        default => 0;
+    }
+}
+helper::benchmarks! {}

2023/day09/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    day09::main();
+}

Cargo.lock

@@ -197,6 +197,15 @@ dependencies = [
  "nom",
 ]
 
+[[package]]
+name = "day09"
+version = "0.1.0"
+dependencies = [
+ "divan",
+ "helper",
+ "nom",
+]
+
 [[package]]
 name = "divan"
 version = "0.1.4"

helper/src/ext.rs

@@ -6,6 +6,10 @@ pub fn integer(input: &str) -> IResult<&str, u64> {
     map(digit1, |d: &str| d.parse::<u64>().unwrap())(input)
 }
 
+pub fn parse_unwrap(s: &str) -> u64 {
+    s.parse().unwrap()
+}
+
 #[derive(Debug)]
 pub struct CollectArrayError;