From faaff8013f612ef64502e47a00d970f840da8122 Mon Sep 17 00:00:00 2001
From: Sebastian Mark <smark@posteo.net>
Date: Wed, 4 Dec 2024 15:33:55 +0100
Subject: [PATCH] add comments

add comments to day02 and day03
---
 2024/02/main.go | 3 ++-
 2024/03/main.go | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/2024/02/main.go b/2024/02/main.go
index adcaa28..2076a95 100644
--- a/2024/02/main.go
+++ b/2024/02/main.go
@@ -43,7 +43,7 @@ func (r report) isSave() bool {
 		return false
 	}
 
-	for i := 0; i < len(r.levels)-1; i++ {
+	for i := 0; i < len(r.levels)-1; i++ { // iterate til second last level
 		if !isValidLevelDifference(r.levels[i], r.levels[i+1]) {
 			return false
 		}
@@ -94,6 +94,7 @@ func (r report) isSaveWithDamper() bool {
 
 func (r report) removeLevelByIndex(dropIndex int) report {
 	var newlevels []int
+	// create new slice w/o passed index position
 	newlevels = append(newlevels, r.levels[:dropIndex]...)
 	newlevels = append(newlevels, r.levels[dropIndex+1:]...)
 
diff --git a/2024/03/main.go b/2024/03/main.go
index 9478c34..97da925 100644
--- a/2024/03/main.go
+++ b/2024/03/main.go
@@ -20,6 +20,7 @@ func main() {
 }
 
 func findAndExecuteInstructions(memory string) (res int) {
+	// find all `mul()` and save numbers as MatchGroup 1 + 2
 	re := regexp.MustCompile(`mul\((\d{1,3}),(\d{1,3})\)`)
 	instructions := re.FindAllStringSubmatch(memory, -1)
 
@@ -31,6 +32,8 @@ func findAndExecuteInstructions(memory string) (res int) {
 }
 
 func findAndExecuteEnabledInstructions(memory string) (res int) {
+	// find all `mul()` and save numbers as MatchGroup 1 + 2
+	// save `do()` and `dont()` in MatchGroup 0
 	re := regexp.MustCompile(`mul\((\d{1,3}),(\d{1,3})\)|do\(\)|don't\(\)`)
 	instructions := re.FindAllStringSubmatch(memory, -1)