solve day 3

2024/day1/day1.go

@@ -2,7 +2,6 @@ package day1
 
 import (
 	"adventofcode/utils"
-	"fmt"
 	"math"
 	"sort"
 	"strconv"
@@ -28,7 +27,6 @@ func Part1(file string) int {
 		dist := leftList[i] - rightList[i]
 		totalDist = int(math.Abs(float64(dist))) + totalDist
 	}
-	fmt.Println(totalDist)
 	return totalDist
 }
 
@@ -54,6 +52,5 @@ func Part2(file string) int {
 		}
 		similarity += (left * matches)
 	}
-	fmt.Println(similarity)
 	return similarity
 }

2024/day2/day2.go

@@ -2,7 +2,6 @@ package day2
 
 import (
 	"adventofcode/utils"
-	"fmt"
 	"math"
 	"strconv"
 	"strings"
@@ -22,7 +21,6 @@ func Part1(file string) int {
 			validLine += 1
 		}
 	}
-	fmt.Println(validLine)
 	return validLine
 }
 
@@ -46,7 +44,6 @@ func Part2(file string) int {
 			validLine += 1
 		}
 	}
-	fmt.Println(validLine)
 	return validLine
 }
 

2024/day3/day3.go

@@ -0,0 +1,62 @@
+package day3
+
+import (
+	"adventofcode/utils"
+	"fmt"
+	"regexp"
+	"strconv"
+	"strings"
+)
+
+func Part1(file string) int {
+	lines := utils.ReadFileByLine(file)
+	content := strings.Join(lines[:], ":")
+
+	re_mul := regexp.MustCompile(`mul\([0-9]+,[0-9]+\)`)
+	multiplications := re_mul.FindAllString(content, -1)
+
+	re_num := regexp.MustCompile(`[0-9]+`)
+	result := 0
+	for _, mul := range multiplications {
+		numbers := re_num.FindAllString(mul, -1)
+		num1, _ := strconv.Atoi(numbers[0])
+		num2, _ := strconv.Atoi(numbers[1])
+		result += (num1 * num2)
+	}
+	fmt.Println(result)
+	return result
+}
+
+func Part2(file string) int {
+	lines := utils.ReadFileByLine(file)
+	content := strings.Join(lines[:], ":")
+
+	re_mul := regexp.MustCompile(`mul\([0-9]+,[0-9]+\)|do\(\)|don\'t\(\)`)
+	inputs := re_mul.FindAllString(content, -1)
+
+	do := true
+	var multiplications []string
+	for _, input := range inputs {
+		if input == "don't()" {
+			do = false
+			continue
+		} else if input == "do()" {
+			do = true
+			continue
+		}
+
+		if do {
+			multiplications = append(multiplications, input)
+		}
+	}
+
+	re_num := regexp.MustCompile(`[0-9]+`)
+	result := 0
+	for _, mul := range multiplications {
+		numbers := re_num.FindAllString(mul, -1)
+		num1, _ := strconv.Atoi(numbers[0])
+		num2, _ := strconv.Atoi(numbers[1])
+		result += (num1 * num2)
+	}
+	return result
+}