Day 10 + rename old files for proper sorting

src/day07.rs

@@ -16,6 +16,7 @@ impl Data {
 }
 
 #[aoc_generator(day7)]
+#[inline(always)]
 pub fn input_generator(input: &str) -> Data {
     let mut ret = Data::new();
     for line in input.lines() {
@@ -51,6 +52,7 @@ pub fn input_generator(input: &str) -> Data {
 }
 
 #[aoc(day7, part1)]
+#[inline(always)]
 pub fn solve_part1(input: &Data) -> usize {
     let mut cnt = 0;
     let mut q = VecDeque::new();
@@ -65,6 +67,7 @@ pub fn solve_part1(input: &Data) -> usize {
 }
 
 #[aoc(day7, part2)]
+#[inline(always)]
 pub fn solve_part2(input: &Data) -> usize {
     let mut cnt = 0;
     let mut q = VecDeque::new();

src/day08.rs

@@ -81,11 +81,13 @@ impl CPU {
 }
 
 #[aoc_generator(day8)]
+#[inline(always)]
 pub fn input_generator(input: &str) -> Vec<Inst> {
     input.trim().lines().map(|l| Inst::from(l.trim())).collect()
 }
 
 #[aoc(day8, part1)]
+#[inline(always)]
 pub fn solve_part1(input: &Vec<Inst>) -> usize {
     let mut seen = HashSet::new();
     let mut cpu = CPU::new(input);
@@ -100,6 +102,7 @@ pub fn solve_part1(input: &Vec<Inst>) -> usize {
 }
 
 #[aoc(day8, part2)]
+#[inline(always)]
 pub fn solve_part2(input: &Vec<Inst>) -> usize {
     for (idx, inst) in input.iter().enumerate() {
         match inst {

src/day09.rs

@@ -1,6 +1,7 @@
 use aoc_runner_derive::{aoc, aoc_generator};
 
 #[aoc_generator(day9)]
+#[inline(always)]
 pub fn input_generator(input: &str) -> Vec<usize> {
     input
         .lines()
@@ -10,6 +11,7 @@ pub fn input_generator(input: &str) -> Vec<usize> {
 }
 
 #[aoc(day9, part1)]
+#[inline(always)]
 pub fn solve_part1(input: &Vec<usize>) -> usize {
     for (n, win) in input.as_slice().windows(25).enumerate() {
         let n = n + 25;
@@ -36,6 +38,7 @@ pub fn solve_part1(input: &Vec<usize>) -> usize {
 }
 
 #[aoc(day9, part2, bruteforce)]
+#[inline(always)]
 pub fn solve_part2(input: &Vec<usize>) -> usize {
     let inv_num = solve_part1(input);
     for start in 0..input.len() {
@@ -50,6 +53,7 @@ pub fn solve_part2(input: &Vec<usize>) -> usize {
 }
 
 #[aoc(day9, part2, faster)]
+#[inline(always)]
 pub fn solve_part2_fast(input: &Vec<usize>) -> usize {
     let target_num = solve_part1(input);
     for i in 2..=input.len() {

src/day10.rs

@@ -0,0 +1,100 @@
+use aoc_runner_derive::{aoc, aoc_generator};
+use std::iter::FromIterator;
+use std::{
+    collections::{HashMap, HashSet, VecDeque},
+    ops::{Sub, SubAssign},
+};
+#[derive(Debug, Eq, PartialEq, Clone)]
+struct SearchState {
+    available: HashSet<u16>,
+    node: u16,
+}
+
+fn solve_part_2_rec(
+    node: u16,
+    goal: u16,
+    map: &HashMap<u16, HashSet<u16>>,
+    used: &HashSet<u16>,
+    cache: &mut HashMap<(u16, u16), usize>,
+) -> usize {
+    if node == goal {
+        return 1;
+    }
+    let mut ret = 0;
+    let mut used = used.clone();
+    // println!("+{}", node);
+    for next in map.get(&node).iter().map(|v| v.iter()).flatten() {
+        if !used.insert(*next) {
+            continue;
+        };
+        let value = match cache.get(&(node, *next)) {
+            Some(value) => *value,
+            None => {
+                let value = solve_part_2_rec(*next, goal, map, &used, cache);
+                cache.insert((node, *next), value);
+                value
+            }
+        };
+        ret += value;
+        used.remove(next);
+    }
+    // println!("-{}", node);
+    ret
+}
+pub struct Data(pub Vec<u16>);
+impl Data {
+    #[inline(always)]
+    fn count_paths(&self) -> usize {
+        let mut nodes = self.0.clone();
+        nodes.push(0);
+        nodes.push(nodes.iter().max().unwrap() + 3);
+        nodes.sort();
+        let goal = *nodes.last().unwrap();
+        let mut map: HashMap<u16, HashSet<u16>> = HashMap::new();
+        for n in &nodes {
+            for v in &nodes {
+                let d = v - n;
+                if d > 0 && d < 4 {
+                    map.entry(*n).or_default().insert(*v);
+                }
+            }
+        }
+        return solve_part_2_rec(0, goal, &map, &HashSet::new(), &mut HashMap::new());
+    }
+}
+
+#[aoc_generator(day10)]
+pub fn input_generator(input: &str) -> Data {
+    let mut numbers = input
+        .lines()
+        .map(|l| l.trim().parse())
+        .collect::<Result<Vec<u16>, _>>()
+        .unwrap();
+    numbers.sort_unstable();
+    return Data(numbers);
+}
+
+#[aoc(day10, part1)]
+#[inline(always)]
+pub fn solve_part1(input: &Data) -> usize {
+    let mut n_1 = 0;
+    let mut n_3 = 0;
+    let mut nums = input.0.clone();
+    nums.push(0);
+    nums.push(nums.iter().max().unwrap() + 3);
+    nums.sort_unstable();
+    for w in nums.windows(2) {
+        match w[1] - w[0] {
+            1 => n_1 += 1,
+            3 => n_3 += 1,
+            _ => (),
+        }
+    }
+    return n_1 * n_3;
+}
+
+#[aoc(day10, part2)]
+#[inline(always)]
+pub fn solve_part2(input: &Data) -> usize {
+    return input.count_paths();
+}

src/lib.rs

@@ -1,11 +1,12 @@
 use aoc_runner_derive::aoc_lib;
-pub mod day1;
-pub mod day2;
-pub mod day3;
-pub mod day4;
-pub mod day5;
-pub mod day6;
-pub mod day7;
-pub mod day8;
-pub mod day9;
+pub mod day01;
+pub mod day02;
+pub mod day03;
+pub mod day04;
+pub mod day05;
+pub mod day06;
+pub mod day07;
+pub mod day08;
+pub mod day09;
+pub mod day10;
 aoc_lib! { year = 2020 }