From a7da60bc86315f38e7ed3425570f919ae1dc499b Mon Sep 17 00:00:00 2001
From: Stevan Freeborn <65925598+StevanFreeborn@users.noreply.github.com>
Date: Thu, 11 Dec 2025 07:06:19 -0600
Subject: [PATCH] feat: solve day 6 part 1

---
 README.md           |  2 +-
 cmd/06/main.go      | 81 +++++++++++++++++++++++++++++++++++++++++++++
 cmd/06/main_test.go | 27 +++++++++++++++
 3 files changed, 109 insertions(+), 1 deletion(-)
 create mode 100644 cmd/06/main.go
 create mode 100644 cmd/06/main_test.go

diff --git a/README.md b/README.md
index 4490c73..95b41c3 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ go test ./cmd/01
 | 03  | [Problem](https://adventofcode.com/2025/day/3)  | [Solution](./cmd/03/) | Part 1 intuitively makes you think you only care about highest nums, but then you need to consider placement. I once again tripped over the solution using a stack. However chat morally supported me the whole time. |
 | 04  | [Problem](https://adventofcode.com/2025/day/4)  | [Solution](./cmd/04/) | Part 1 was by far the most straight-forward challenge so far. This was easiest day of AoC this year by far.                                                                                                           |
 | 05  | [Problem](https://adventofcode.com/2025/day/5)  | [Solution](./cmd/05/) | Part 1 was fairly straight forward. Merging ranges was trickiest bit. I feel like I'm being led into a trap with how straight forward today was.                                                                      |
-| 06  | [Problem](https://adventofcode.com/2025/day/6)  | [Solution](./cmd/06/) |                                                                                                                                                                                                                       |
+| 06  | [Problem](https://adventofcode.com/2025/day/6)  | [Solution](./cmd/06/) | Part 1 I don't think it is the best solution, but it does solve it.                                                                                                                                                   |
 | 07  | [Problem](https://adventofcode.com/2025/day/7)  | [Solution](./cmd/07/) |                                                                                                                                                                                                                       |
 | 08  | [Problem](https://adventofcode.com/2025/day/8)  | [Solution](./cmd/08/) |                                                                                                                                                                                                                       |
 | 09  | [Problem](https://adventofcode.com/2025/day/9)  | [Solution](./cmd/09/) |                                                                                                                                                                                                                       |
diff --git a/cmd/06/main.go b/cmd/06/main.go
new file mode 100644
index 0000000..20389ea
--- /dev/null
+++ b/cmd/06/main.go
@@ -0,0 +1,81 @@
+package main
+
+import (
+	"regexp"
+	"strconv"
+
+	"github.com/StevanFreeborn/advent-of-code-2025/internal/file"
+)
+
+func SolvePartOne(filePath string) int {
+	input := file.ReadAllLines(filePath)
+	inputLength := len(input)
+	lastLineIndex := inputLength - 1
+
+	operandLines := input[:lastLineIndex]
+	operators := input[lastLineIndex]
+	listOfOperands := [][]int{}
+
+	for _, line := range operandLines {
+		parsedOperands := parseOperands(line)
+		listOfOperands = append(listOfOperands, parsedOperands)
+	}
+
+	ops := parseOperators(operators)
+
+	total := 0
+
+	for i := range len(ops) {
+		operator := ops[i]
+
+		result := 0
+
+		for _, operands := range listOfOperands {
+			if result == 0 {
+				result = operands[i]
+				continue
+			}
+
+			if operator == "*" {
+				result *= operands[i]
+				continue
+			}
+
+			if operator == "+" {
+				result += operands[i]
+				continue
+			}
+		}
+
+		total += result
+	}
+
+	return total
+}
+
+func parseOperators(line string) []string {
+	operatorsRegex := regexp.MustCompile(`(\*|\+)`)
+	matches := operatorsRegex.FindAllStringSubmatch(line, -1)
+
+	operators := []string{}
+
+	for _, match := range matches {
+		operators = append(operators, match[1])
+	}
+
+	return operators
+}
+
+func parseOperands(line string) []int {
+	numbersRegex := regexp.MustCompile(`(\d+)`)
+	matches := numbersRegex.FindAllStringSubmatch(line, -1)
+
+	operands := []int{}
+
+	for _, match := range matches {
+		num, _ := strconv.Atoi(match[1])
+		operands = append(operands, num)
+	}
+
+	return operands
+}
diff --git a/cmd/06/main_test.go b/cmd/06/main_test.go
new file mode 100644
index 0000000..1a93b56
--- /dev/null
+++ b/cmd/06/main_test.go
@@ -0,0 +1,27 @@
+package main_test
+
+import (
+	"testing"
+
+	solution "github.com/StevanFreeborn/advent-of-code-2025/cmd/06"
+)
+
+func TestSolvePartOneWithExampleInput(t *testing.T) {
+	expected := 4277556
+
+	result := solution.SolvePartOne("EXAMPLE.txt")
+
+	if result != expected {
+		t.Errorf("got %d but wanted %d", result, expected)
+	}
+}
+
+func TestSolvePartOneWithInput(t *testing.T) {
+	expected := 6169101504608
+
+	result := solution.SolvePartOne("INPUT.txt")
+
+	if result != expected {
+		t.Errorf("got %d but wanted %d", result, expected)
+	}
+}