feat(2025): add day6

.gitattributes

@@ -0,0 +1 @@
+* text=lf

2025/day6/day6.go

@@ -0,0 +1,137 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+)
+
+func readInput() [][]string {
+	data, _ := os.ReadFile("input.txt")
+	content := strings.TrimSpace(string(data))
+	lines := strings.Split(content, "\n")
+	input := [][]string{}
+	size := len(strings.Fields(lines[0]))
+	for range size {
+		input = append(input, []string{})
+	}
+	for _, line := range lines {
+		parts := strings.Fields(line)
+		for i, part := range parts {
+			input[i] = append(input[i], strings.TrimSpace(part))
+		}
+	}
+
+	return input
+}
+
+func part1() {
+	input := readInput()
+	result := 0
+	for _, operation := range input {
+		total, _ := strconv.Atoi(operation[0])
+		if operation[len(operation)-1] == "+" {
+			for _, value := range operation[1 : len(operation)-1] {
+				num, _ := strconv.Atoi(value)
+				total += num
+			}
+		} else {
+			for _, value := range operation[1 : len(operation)-1] {
+				num, _ := strconv.Atoi(value)
+				total *= num
+			}
+		}
+		result += total
+	}
+
+	fmt.Printf("%d\n", result)
+}
+
+func readInput2() [][]rune {
+	file, _ := os.Open("input.txt")
+	defer file.Close()
+	scanner := bufio.NewScanner(file)
+	lines := []string{}
+	r, c := 0, 0
+	for scanner.Scan() {
+		line := scanner.Text()
+		lines = append(lines, line)
+		if len(line) > c {
+			c = len(line)
+		}
+		r++
+	}
+
+	// Because operands in + and * in each operation and when calculate sum can be swaped
+	// We can do this
+	// Flip the matrix to make it easier to read
+	r, c = c, r
+	input := [][]rune{}
+	for i := range r {
+		slice := []rune{}
+		for j := range c {
+			if j < len(lines) && i < len(lines[j]) {
+				slice = append(slice, rune(lines[j][i]))
+			} else {
+				slice = append(slice, ' ')
+			}
+		}
+		input = append(input, slice)
+	}
+
+	return input
+}
+
+func part2() {
+	input := readInput2()
+	result := 0
+	newOperation := true
+	total := 0
+	operation := ' '
+	for _, line := range input {
+		str := strings.TrimSpace(string(line))
+		if len(str) == 0 {
+			// fmt.Printf("Total: %d\n", total)
+			result += total
+			total = 0
+			newOperation = true
+			continue
+		}
+		if newOperation {
+			first := str[:len(str)-1]
+			// fmt.Printf("First: %s\n", first)
+			number, err := strconv.Atoi(strings.TrimSpace(first))
+			if err != nil {
+				fmt.Println("Error parsing number:", err)
+				return
+			}
+			total = number
+			operation = rune(str[len(str)-1])
+			newOperation = false
+			// fmt.Printf("First: %d, Operation: %c\n", total, operation)
+		} else {
+			number, err := strconv.Atoi(str)
+			if err != nil {
+				fmt.Println("Error parsing number:", err)
+				return
+			}
+			// fmt.Println(number)
+			switch operation {
+			case '+':
+				total += number
+			case '*':
+				total *= number
+			}
+		}
+	}
+	result += total
+
+	fmt.Printf("%d\n", result)
+}
+
+func main() {
+	part1()
+	part2()
+}

2025/day6/go.mod

@@ -0,0 +1,3 @@
+module day6
+
+go 1.23.4