2025 day06

Author: liamgallear

2025/day06/.bench

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+{"Lines":[{"Name":"Part 1","N":15148,"NsPerOp":78513,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0},{"Name":"Part 2","N":23038,"NsPerOp":51862,"AllocedBytesPerOp":0,"AllocsPerOp":0,"MBPerS":0,"Measured":1,"Ord":0}],"Measured":1}

2025/day06/README.md

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+<!-- You can add some comments here if you want to :D -->

2025/day06/main.go

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+package main
+
+import (
+	_ "embed"
+	"os"
+)
+
+//go:embed input.txt
+var input string
+
+//go:embed input_test.txt
+var inputTest string
+
+func main() {
+	// Check argv if we use test input or not
+	if len(os.Args) > 1 && os.Args[1] == "test" {
+		input = inputTest
+	}
+
+	answer := doPartOne(input)
+	println(answer)
+
+	answer = doPartTwo(input)
+	println(answer)
+}

2025/day06/main_test.go

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+package main
+
+import "testing"
+
+func BenchmarkPartOne(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		doPartOne(input)
+	}
+}
+
+func BenchmarkPartTwo(b *testing.B) {
+	for n := 0; n < b.N; n++ {
+		doPartTwo(input)
+	}
+}

2025/day06/part1.go

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+package main
+
+import (
+	"aocli/utils"
+	"strings"
+)
+
+func doPartOne(input string) int {
+	lines := strings.Split(strings.TrimSpace(input), "\n")
+	numbers := make([][]int, len(lines[0]))
+	for x := 0; x < len(lines)-1; x++ {
+		for y, v := range strings.Fields(lines[x]) {
+			numbers[y] = append(numbers[y], utils.Atoi(v))
+		}
+	}
+	ans := 0
+	for y, v := range strings.Fields(lines[len(lines)-1]) {
+		subAns := numbers[y][0]
+		if v[0] == '+' {
+			for i := 1; i < len(numbers[y]); i++ {
+				subAns += numbers[y][i]
+			}
+		} else {
+			for i := 1; i < len(numbers[y]); i++ {
+				subAns *= numbers[y][i]
+			}
+		}
+		ans += subAns
+	}
+	// mapper, rect := maps.MakeImagePointMapRect(strings.Split(strings.TrimSpace(input), "\n"))
+
+	// ans := 0
+	// for x := 0; x < rect.Max.X; x++ {
+	// 	subAns := utils.Atoi(string(mapper[image.Point{x, 0}]))
+	// 	if mapper[image.Point{x, rect.Max.Y - 1}] == '+' {
+	// 		for y := 1; y < rect.Max.Y-1; y++ {
+	// 			subAns += utils.Atoi(string(mapper[image.Point{x, y}]))
+	// 		}
+	// 		ans += subAns
+	// 		continue
+	// 	}
+	// 	for y := 1; y < rect.Max.Y-1; y++ {
+	// 		subAns *= utils.Atoi(string(mapper[image.Point{x, y}]))
+	// 	}
+	// 	ans += subAns
+	// }
+	return ans
+}

2025/day06/part2.go

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+package main
+
+import (
+	"aocli/utils"
+	"strings"
+)
+
+func doPartTwo(input string) int {
+	lines := strings.Split(input, "\n")
+	// Remove trailing empty line if present
+	if len(lines) > 0 && len(lines[len(lines)-1]) == 0 {
+		lines = lines[:len(lines)-1]
+	}
+
+	if len(lines) == 0 {
+		return 0
+	}
+
+	ans := 0
+	startCol := 0
+	lastLine := len(lines) - 1
+	lineWidth := len(lines[0])
+
+	// Iterate through each column
+	for x := 0; x < lineWidth; x++ {
+		// Check if this column is blank (separator between problems)
+		isBlank := true
+		for y := 0; y < lastLine; y++ {
+			if x < len(lines[y]) && lines[y][x] != ' ' {
+				isBlank = false
+				break
+			}
+		}
+
+		if isBlank {
+			// Process the problem from startCol to x-1
+			operator := lines[lastLine][startCol]
+			result := 0
+
+			if operator == '+' {
+				result = 0
+			} else {
+				result = 1
+			}
+
+			// Read each column in this problem
+			for col := startCol; col < x; col++ {
+				var numBuilder strings.Builder
+				// Read vertically from top to bottom
+				for y := 0; y < lastLine; y++ {
+					if col < len(lines[y]) && lines[y][col] != ' ' {
+						numBuilder.WriteByte(lines[y][col])
+					}
+				}
+
+				if numBuilder.Len() > 0 {
+					num := utils.Atoi(numBuilder.String())
+					if operator == '+' {
+						result += num
+					} else {
+						result *= num
+					}
+				}
+			}
+
+			ans += result
+			startCol = x + 1
+		}
+	}
+
+	// Handle last problem if it doesn't end with a blank column
+	if startCol < lineWidth {
+		operator := lines[lastLine][startCol]
+		result := 0
+
+		if operator == '+' {
+			result = 0
+		} else {
+			result = 1
+		}
+
+		for col := startCol; col < lineWidth; col++ {
+			var numBuilder strings.Builder
+			for y := 0; y < lastLine; y++ {
+				if col < len(lines[y]) && lines[y][col] != ' ' {
+					numBuilder.WriteByte(lines[y][col])
+				}
+			}
+
+			if numBuilder.Len() > 0 {
+				num := utils.Atoi(numBuilder.String())
+				if operator == '+' {
+					result += num
+				} else {
+					result *= num
+				}
+			}
+		}
+
+		ans += result
+	}
+
+	return ans
+}