From 6f3740848595e79ef2153cd50b240f834303eef1 Mon Sep 17 00:00:00 2001
From: Tobi <me@maiertobi.de>
Date: Thu, 16 Dec 2021 16:48:25 +0100
Subject: [PATCH] Finished Dec 15

---
 december_15/example2.txt |   3 ++
 december_15/src/main.rs  | 114 ++++++++++++++++++++++++++++-----------
 2 files changed, 85 insertions(+), 32 deletions(-)
 create mode 100644 december_15/example2.txt

diff --git a/december_15/example2.txt b/december_15/example2.txt
new file mode 100644
index 0000000..97a6549
--- /dev/null
+++ b/december_15/example2.txt
@@ -0,0 +1,3 @@
+19999
+19111
+11191
\ No newline at end of file
diff --git a/december_15/src/main.rs b/december_15/src/main.rs
index 42fdc7c..5a0b96c 100644
--- a/december_15/src/main.rs
+++ b/december_15/src/main.rs
@@ -1,11 +1,16 @@
-use std::collections::BTreeMap;
+use std::collections::HashMap;
 use std::fs::File;
 use std::io::{BufReader};
 use std::io::prelude::*;
 
 const RADIX: u32 = 10;
 
-static mut shortest: u32 = 99999;
+struct Node {
+    distance: u32,
+    previous: Option<(usize, usize)>,
+    neigbours: Vec<(usize, usize)>,
+    visited: bool
+}
 
 fn main(){
     let file = File::open("./input.txt").expect("Read failed");
@@ -22,41 +27,86 @@ fn main(){
         weight_vec.push(temp_vec);
     }
 
+    let mut weight_vec_big_temp = Vec::new();
+    for line in 0..weight_vec.len() {
+        let mut new_line_vec = Vec::new();
+        for i in 0..weight_vec.len() * 5 {
+            let coordinate_from = i % weight_vec[line].len();
+            let add_val = i / weight_vec[line].len();
+            let mut new_value = weight_vec[line][coordinate_from] + add_val as u32;
+            if new_value > 9 {
+                new_value -= 9;
+            }
+            new_line_vec.push(new_value);
+        }
+        weight_vec_big_temp.push(new_line_vec);
+    }
+
+    let mut final_vector = Vec::new();
+
+    for line in 0..weight_vec_big_temp.len() * 5 {
+        let add_val = line / weight_vec_big_temp.len();
+        let mut temp_vec = Vec::new();
+        for i in 0..weight_vec_big_temp[0].len() {
+            let mut new_value = weight_vec_big_temp[line % weight_vec_big_temp.len()][i]  + add_val as u32;
+            if new_value > 9 {
+                new_value -= 9;
+            }
+            temp_vec.push(new_value)
+        }
+        final_vector.push(temp_vec);
+    }
+
+    println!("Finished generating Vec");
+    weight_vec = final_vector;
+
     let height = weight_vec.len();
     let width = weight_vec[0].len();
 
-    let visited: Vec<(usize, usize)> = Vec::new();
+    let mut graph = HashMap::new();
 
-    let out = get_shortest_weight(&weight_vec, 0, 0, 0, width, height, &visited);
-
-
-
-    println!("");
-}
-
-fn get_shortest_weight(weight_vec: &Vec<Vec<u32>>, x: usize, y: usize, current_weight: u32, width: usize, height: usize, visited: &Vec<(usize, usize)>) {
-    let mut visited_local = visited.to_owned();
-    
-    unsafe {
-        if current_weight > shortest {
-            return;
+    for x in 0..width {
+        for y in 0..height {
+            let mut neighbours = Vec::new();
+            if x > 0 { neighbours.push((x-1,y)) }
+            if x < width - 1 { neighbours.push((x+1,y)) }
+            if y > 0 { neighbours.push((x,y-1)) }
+            if y < height - 1 { neighbours.push((x,y+1)) }
+            graph.insert((x,y) , Node{distance: u32::MAX, previous: None, neigbours: neighbours, visited: false});
         }
     }
-    if x == width - 1 && y == height - 1 {
-        unsafe {shortest = current_weight;
-        println!("Current length: {}, shortest now: {}", current_weight, shortest);}
-        return;
-    }
-    
-    if visited_local.contains(&(x,y)) {
-        return;
-    }
-    visited_local.push((x,y));
-    
-    let temp_weight = current_weight + weight_vec[y][x];
 
-    if x > 0 { get_shortest_weight(&weight_vec, x - 1, y, temp_weight, width, height, &visited_local); }
-    if x < width - 1 { get_shortest_weight(&weight_vec, x + 1, y, temp_weight, width, height, &visited_local); }
-    if y > 0 { get_shortest_weight(&weight_vec, x, y-1, temp_weight, width, height, &visited_local); }
-    if y < height - 1 { get_shortest_weight(&weight_vec, x, y+1, temp_weight, width, height, &visited_local); }
+    let default_node = Node { distance: 0, previous: None, neigbours: Vec::new(), visited: false };
+
+    let start_node = (0,0);
+    let end_node = (width-1, height-1);
+
+    graph.entry(start_node).or_insert(default_node).distance = 0;
+
+    loop {
+        let active_node = &graph.iter().filter(|x| x.1.visited == false).min_by_key(|x| x.1.distance).expect("").0.to_owned();
+
+        if active_node == &end_node {
+            break;
+        }
+        let distance = graph.get(active_node).expect("PANIK").distance;
+        //graph.entry(active_node.to_owned()).or_insert(Node { distance: 0, previous: None, neigbours: Vec::new(), visited: false }).visited = true;
+        graph.get_mut(active_node).unwrap().visited = true;
+
+        for neighbour in graph.get(active_node).expect("PANIK").neigbours.clone() {
+
+            let old_distance = graph.get(&neighbour).expect("PANIK").distance;
+            let new_distance = distance + weight_vec[neighbour.1][neighbour.0];
+            if new_distance < old_distance.to_owned() {
+                graph.get_mut(&neighbour).unwrap().distance = new_distance;
+                graph.get_mut(&neighbour).unwrap().previous = Some(active_node.to_owned());
+            }
+
+        }
+    }
+
+
+    let distance = graph.get(&end_node).unwrap().distance;
+
+    println!("{}", distance);
 }
\ No newline at end of file