From fa33f71139e131e530e265f3aa8f5f4f1c7d6a25 Mon Sep 17 00:00:00 2001
From: Philippe Zwietering <philippe.zwietering@gmail.com>
Date: Fri, 16 Dec 2022 16:20:09 +0100
Subject: [PATCH] Finished day 9 part 1 aoc

---
 advent_of_code/2022/9/main.cpp | 63 +++++++++++++++-------------------
 1 file changed, 27 insertions(+), 36 deletions(-)

diff --git a/advent_of_code/2022/9/main.cpp b/advent_of_code/2022/9/main.cpp
index cf119bb..64fd2a7 100644
--- a/advent_of_code/2022/9/main.cpp
+++ b/advent_of_code/2022/9/main.cpp
@@ -5,50 +5,39 @@ using namespace std;
 using Coords = pair<int, int>;
 
 void moveTail(const Coords& head, Coords& tail){
-    if(head.first - tail.first > 1){
-        tail.first++;
-    } else if(head.first - tail.first < -1){
-        tail.first--;
+    if(abs(head.first - tail.first) <= 1 && abs(head.second - tail.second) <= 1){
+        return;
     }
 
-    if(head.second - tail.second > 1){
+    if(head.first == tail.first){
+        if(head.second > tail.second){
+            tail.second++;
+        } else{
+            tail.second--;
+        }
+    } else if(head.second == tail.second){
+        if(head.first > tail.first){
+            tail.first++;
+        } else{
+            tail.first--;
+        }
+    } else if(head.first > tail.first && head.second > tail.second){
+        tail.first++;
         tail.second++;
-    } else if(head.second - tail.second < -1){
+    } else if(head.first < tail.first && head.second > tail.second){
+        tail.first--;
+        tail.second++;
+    } else if(head.first > tail.first && head.second < tail.second){
+        tail.first++;
+        tail.second--;
+    } else if(head.first < tail.first && head.second < tail.second){
+        tail.first--;
         tail.second--;
     }
-    // if(abs(head.first - tail.first) > 1 || abs(head.second - tail.second) > 1){
-    //     if(abs(head.first - tail.first) >= 1 && abs(head.second - tail.second) >= 1){
-    //         if(head.first > tail.first && head.second > tail.second){
-    //             tail.first++;
-    //             tail.second++;
-    //         } else if(head.first > tail.first && head.second < tail.second){
-    //             tail.first++;
-    //             tail.second--;
-    //         } else if(head.first < tail.first && head.second > tail.second){
-    //             tail.first--;
-    //             tail.second++;
-    //         } else{
-    //             tail.first--;
-    //             tail.second--;
-    //         }
-    //     } else if(abs(head.first - tail.first > 1)){
-    //         if(head.first > tail.first){
-    //             tail.first++;
-    //         } else{
-    //             tail.first--;
-    //         }
-    //     } else{
-    //         if(head.second > tail.second){
-    //             tail.second++;
-    //         } else{
-    //             tail.second--;
-    //         }
-    //     }
-    // }
 }
 
 int main(){
-    ifstream input_file("test.txt");
+    ifstream input_file("input.txt");
     string line;
 
     Coords head(0, 0), tail(0, 0);
@@ -75,6 +64,8 @@ int main(){
             moveTail(head, tail);
             visited_by_tail.insert(tail);
             steps--;
+
+            // cout << head.first << " " << head.second << " " << tail.first << " " << tail.second << '\n';
         }
     }