From 60f0fce822527372135ead5ca2a4843ee9b8d31c Mon Sep 17 00:00:00 2001
From: Justin Wernick <justin@worthe-it.co.za>
Date: Tue, 8 Dec 2020 20:56:43 +0200
Subject: Improvement!

---
 src/bin/day_8.rs | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/src/bin/day_8.rs b/src/bin/day_8.rs
index c7df9f5..2c0c227 100644
--- a/src/bin/day_8.rs
+++ b/src/bin/day_8.rs
@@ -1,7 +1,7 @@
 use bevy::{app::AppExit, prelude::*};
-use std::fs::File;
+use std::convert::TryFrom;
 use std::io::{BufRead, BufReader};
-use std::{collections::BTreeMap, convert::TryFrom};
+use std::{collections::BTreeSet, fs::File};
 
 fn main() {
     App::build()
@@ -45,7 +45,7 @@ struct Computer {
     termiated: bool,
 }
 #[derive(Default)]
-struct LineTracker(BTreeMap<i32, usize>);
+struct LineTracker(BTreeSet<i32>);
 
 impl Computer {
     fn exec(&mut self, program: &Program) {
@@ -123,8 +123,7 @@ fn track_program_line_execution(
     computer: &Computer,
     unaltered: Option<&UnalteredProgram>,
 ) {
-    *line_tracker.0.entry(computer.program_counter).or_insert(0) += 1;
-    if *line_tracker.0.get(&computer.program_counter).unwrap() > 1 {
+    if line_tracker.0.contains(&computer.program_counter) {
         if unaltered.is_some() {
             println!(
                 "About to execute a line for the second time! Line {}. Accumulator: {}",
@@ -132,6 +131,8 @@ fn track_program_line_execution(
             );
         }
         commands.despawn(entity);
+    } else {
+        line_tracker.0.insert(computer.program_counter);
     }
 }
 
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