finished day 2

README.md

@@ -1,7 +1,7 @@
 # Advent of Code 2023
 
 [![Tests](https://github.com/devries/advent_of_code_2023/actions/workflows/main.yml/badge.svg)](https://github.com/devries/advent_of_code_2023/actions/workflows/main.yml)
-[![Stars: 2](https://img.shields.io/badge/⭐_Stars-2-yellow)](https://adventofcode.com/2023)
+[![Stars: 4](https://img.shields.io/badge/⭐_Stars-4-yellow)](https://adventofcode.com/2023)
 
 ## Plan for This Year
 
@@ -37,3 +37,11 @@ opportunity to experiment a bit with code generation.
   matches starting at the next character after your previous search and I did
   have some indexing issues which I had to debug. I later realized I could use
   `strings.LastIndex` to make this much easier.
+
+- [Day 2:Cube Conundrum ](https://adventofcode.com/2023/day/2) - [part 1](day02p1/solution.go), [part 2](day02p2/solution.go)
+
+  Most of this problem was parsing. I just did a lot of splitting on substrings.
+  First I split on ": " to separate the game id from the draws, then I split on
+  "; " to separate the individual draws, then on ", " to split to the colors.
+  After that it was straightforward. I missed an opportunity to use the debugger
+  to check my parsing and instead put in a `Println`. 

day02p1/solution.go

@@ -0,0 +1,66 @@
+package day02p1
+
+import (
+	"io"
+	"strconv"
+	"strings"
+
+	"aoc/utils"
+)
+
+var maxred = 12
+var maxgreen = 13
+var maxblue = 14
+
+func Solve(r io.Reader) any {
+	lines := utils.ReadLines(r)
+
+	sum := 0
+
+outer:
+	for _, ln := range lines {
+		game := parseGame(ln)
+
+		for _, draw := range game.Draws {
+			if draw["red"] > maxred || draw["green"] > maxgreen || draw["blue"] > maxblue {
+				continue outer
+			}
+		}
+		sum += game.Id
+	}
+
+	return sum
+}
+
+type Game struct {
+	Id    int
+	Draws []map[string]int
+}
+
+func parseGame(line string) Game {
+	firstSplit := strings.Split(line, ": ")
+
+	idstrings := strings.Fields(firstSplit[0])
+
+	result := Game{}
+
+	var err error
+	result.Id, err = strconv.Atoi(idstrings[1])
+	utils.Check(err, "Unable to convert %s to integer", idstrings[1])
+
+	draws := strings.Split(firstSplit[1], "; ")
+
+	for _, draw := range draws {
+		drawmap := make(map[string]int)
+		colorsets := strings.Split(draw, ", ")
+		for _, colorset := range colorsets {
+			parts := strings.Fields(colorset)
+			n, err := strconv.Atoi(parts[0])
+			utils.Check(err, "Unable to convert %s to integer", parts[0])
+			drawmap[parts[1]] = n
+		}
+		result.Draws = append(result.Draws, drawmap)
+	}
+
+	return result
+}

day02p1/solution_test.go

@@ -0,0 +1,37 @@
+package day02p1
+
+import (
+	"strings"
+	"testing"
+
+	"aoc/utils"
+)
+
+var testInput = `Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green`
+
+func TestSolve(t *testing.T) {
+	tests := []struct {
+		input  string
+		answer int
+	}{
+		{testInput, 8},
+	}
+
+	if testing.Verbose() {
+		utils.Verbose = true
+	}
+
+	for _, test := range tests {
+		r := strings.NewReader(test.input)
+
+		result := Solve(r).(int)
+
+		if result != test.answer {
+			t.Errorf("Expected %d, got %d", test.answer, result)
+		}
+	}
+}

day02p2/solution.go

@@ -0,0 +1,65 @@
+package day02p2
+
+import (
+	"io"
+	"strconv"
+	"strings"
+
+	"aoc/utils"
+)
+
+func Solve(r io.Reader) any {
+	lines := utils.ReadLines(r)
+
+	sum := 0
+
+	for _, ln := range lines {
+		game := parseGame(ln)
+
+		maximums := make(map[string]int)
+		for _, draw := range game.Draws {
+			for k, v := range draw {
+				if v > maximums[k] {
+					maximums[k] = v
+				}
+			}
+		}
+
+		sum += maximums["red"] * maximums["green"] * maximums["blue"]
+	}
+
+	return sum
+}
+
+type Game struct {
+	Id    int
+	Draws []map[string]int
+}
+
+func parseGame(line string) Game {
+	firstSplit := strings.Split(line, ": ")
+
+	idstrings := strings.Fields(firstSplit[0])
+
+	result := Game{}
+
+	var err error
+	result.Id, err = strconv.Atoi(idstrings[1])
+	utils.Check(err, "Unable to convert %s to integer", idstrings[1])
+
+	draws := strings.Split(firstSplit[1], "; ")
+
+	for _, draw := range draws {
+		drawmap := make(map[string]int)
+		colorsets := strings.Split(draw, ", ")
+		for _, colorset := range colorsets {
+			parts := strings.Fields(colorset)
+			n, err := strconv.Atoi(parts[0])
+			utils.Check(err, "Unable to convert %s to integer", parts[0])
+			drawmap[parts[1]] = n
+		}
+		result.Draws = append(result.Draws, drawmap)
+	}
+
+	return result
+}

day02p2/solution_test.go

@@ -0,0 +1,37 @@
+package day02p2
+
+import (
+	"strings"
+	"testing"
+
+	"aoc/utils"
+)
+
+var testInput = `Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
+Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
+Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
+Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
+Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green`
+
+func TestSolve(t *testing.T) {
+	tests := []struct {
+		input  string
+		answer int
+	}{
+		{testInput, 2286},
+	}
+
+	if testing.Verbose() {
+		utils.Verbose = true
+	}
+
+	for _, test := range tests {
+		r := strings.NewReader(test.input)
+
+		result := Solve(r).(int)
+
+		if result != test.answer {
+			t.Errorf("Expected %d, got %d", test.answer, result)
+		}
+	}
+}