From 3d44c7c416e2fc7b4b62877b5ac7a5fd424e1a30 Mon Sep 17 00:00:00 2001
From: Stedd <toanpa+git@pm.me>
Date: Sun, 1 Dec 2024 17:28:18 +0100
Subject: [PATCH] Using the filestream to run the parser loop directly

Also removed col2 variable and calculating occurrence_map during parsing.
---
 days/day01.cpp | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

diff --git a/days/day01.cpp b/days/day01.cpp
index 6916900..a5f7b90 100644
--- a/days/day01.cpp
+++ b/days/day01.cpp
@@ -153,7 +153,6 @@ Once again consider your left and right lists. What is their similarity score?
 void day01::Part2()
 {
 	std::vector<int> col1;
-	std::vector<int> col2;
 	std::unordered_map<int, int> occurrence_map;
 	int sum = 0;
 
@@ -168,21 +167,14 @@ void day01::Part2()
 		return;
 	}
 
-	std::string delimiter = "   ";
-	auto delimiterLength = delimiter.length();
-
 	std::string line;
-	while (std::getline(input, line))
+	int num1, num2;
+	while (input >> num1 >> num2)
 	{
-		auto delimiterPos = line.find(delimiter);
-		col1.emplace_back(std::stoi(line.substr(0, delimiterPos)));
-		col2.emplace_back(std::stoi(line.substr(delimiterPos + delimiterLength, line.length())));
+		col1.emplace_back(num1);
+		occurrence_map[num2]++;
 	}
 
-	for (auto number: col2)
-	{
-		occurrence_map[number]++;
-	}
 	for (auto number: col1)
 	{
 		sum += number * occurrence_map[number];