Small changes.

2016-12-23 19:52:02 +01:00
parent 5f8df692b6
commit df49cc1866
9 changed files with 338 additions and 2 deletions
--- a/2015/09/Cargo.lock
+++ b/2015/09/Cargo.lock
@@ -0,0 +1,105 @@
+[root]
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+]
+
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+dependencies = [
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+
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+
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+name = "libc"
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+dependencies = [
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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--- a/2015/09/Cargo.toml
+++ b/2015/09/Cargo.toml
@@ -0,0 +1,8 @@
+[package]
+name = "09"
+version = "0.1.0"
+authors = ["logaritmisk <anders.e.olsson@gmail.com>"]
+
+[dependencies]
+lazy_static = "0.1"
+regex = "0.1"
--- a/2015/09/input.txt
+++ b/2015/09/input.txt
@@ -0,0 +1,28 @@
+Faerun to Tristram = 65
+Faerun to Tambi = 129
+Faerun to Norrath = 144
+Faerun to Snowdin = 71
+Faerun to Straylight = 137
+Faerun to AlphaCentauri = 3
+Faerun to Arbre = 149
+Tristram to Tambi = 63
+Tristram to Norrath = 4
+Tristram to Snowdin = 105
+Tristram to Straylight = 125
+Tristram to AlphaCentauri = 55
+Tristram to Arbre = 14
+Tambi to Norrath = 68
+Tambi to Snowdin = 52
+Tambi to Straylight = 65
+Tambi to AlphaCentauri = 22
+Tambi to Arbre = 143
+Norrath to Snowdin = 8
+Norrath to Straylight = 23
+Norrath to AlphaCentauri = 136
+Norrath to Arbre = 115
+Snowdin to Straylight = 101
+Snowdin to AlphaCentauri = 84
+Snowdin to Arbre = 96
+Straylight to AlphaCentauri = 107
+Straylight to Arbre = 14
+AlphaCentauri to Arbre = 46
--- a/2015/09/src/main.rs
+++ b/2015/09/src/main.rs
@@ -0,0 +1,125 @@
+#[macro_use] extern crate lazy_static;
+extern crate regex;
+
+use std::io::{self, Read};
+use std::collections::BTreeMap;
+
+use regex::Regex;
+
+
+type Map<'a> = BTreeMap<&'a str, BTreeMap<&'a str, i64>>;
+
+
+#[derive(Clone, Debug)]
+struct Route<'a> {
+    vec: Vec<&'a str>,
+    distance: i64
+}
+
+impl<'a> Route<'a> {
+    fn new() -> Route<'a> {
+        Route {
+            vec: Vec::new(),
+            distance: 0
+        }
+    }
+}
+
+
+fn process<'a>(input: &'a str) -> Route<'a> {
+    lazy_static! {
+        static ref RE: Regex = Regex::new(r"^([a-zA-Z]+) to ([a-zA-Z]+) = (\d+)$").unwrap();
+    }
+
+    let mut map: Map = BTreeMap::new();
+
+    for line in input.lines() {
+        let caps = RE.captures(&line).unwrap();
+
+        let a = caps.at(1).unwrap();
+        let b = caps.at(2).unwrap();
+
+        let distance = caps.at(3).unwrap().parse::<i64>().unwrap();
+
+        map.entry(a).or_insert(BTreeMap::new()).insert(b, distance);
+        map.entry(b).or_insert(BTreeMap::new()).insert(a, distance);
+    }
+
+    let mut routes = iterate(&map, None);
+
+    routes.sort_by_key(|x| x.distance);
+
+    routes.remove(0)
+}
+
+fn iterate<'a>(map: &Map<'a>, route: Option<Route<'a>>) -> Vec<Route<'a>> {
+    let mut routes = Vec::new();
+
+    if let Some(mut route) = route {
+        let prev = *route.vec.last().unwrap();
+
+        let mut end = true;
+
+        for (city, distance) in map.get(prev).unwrap().iter() {
+            if route.vec.contains(city) {
+                continue;
+            }
+
+            route.vec.push(*city);
+            route.distance += *distance;
+
+            {
+                let mut sub_routes = iterate(&map, Some(route.clone()));
+
+                routes.append(&mut sub_routes);
+            }
+
+            end = false;
+        }
+
+        if end {
+            routes.push(route);
+        }
+    } else {
+        for city in map.keys() {
+            let mut route = Route::new();
+
+            route.vec.push(*city);
+
+            {
+                let mut sub_routes = iterate(&map, Some(route));
+
+                routes.append(&mut sub_routes);
+            }
+        }
+    }
+
+    routes
+}
+
+fn main() {
+    let mut input = String::new();
+
+    io::stdin().read_to_string(&mut input).unwrap();
+
+    let result = process(&input);
+
+    println!("{:?}", result);
+}
+
+
+#[cfg(test)]
+mod tests {
+    use super::process;
+
+    #[test]
+    fn example_01() {
+        let input = "London to Dublin = 464\n\
+                     London to Belfast = 518\n\
+                     Dublin to Belfast = 141";
+
+        let result = process(input);
+
+        assert_eq!(605, result.distance);
+    }
+}