2025 Day 1 Complete! 🎅

2025/day01/main.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"fmt"
+
+	h "git.bullercodeworks.com/brian/adventofcode/helpers"
+)
+
+func main() {
+	inp := h.StdinToStringSlice()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(inp []string) {
+	var hit int
+	dial := 50
+	for i := range inp {
+		dir, snum := inp[i][0], inp[i][1:]
+		num := h.Atoi(snum)
+		switch dir {
+		case 'R':
+			dial += num
+		case 'L':
+			dial -= num
+		}
+		dial = (dial + 100) % 100
+		if dial == 0 {
+			hit++
+		}
+	}
+	fmt.Println("# Part 1")
+	fmt.Println(hit)
+}
+
+func part2(inp []string) {
+	var hit int
+	dial := 50
+	for i := range inp {
+		dir, snum := inp[i][0], inp[i][1:]
+		num := h.Atoi(snum)
+		for j := 0; j < num; j++ {
+			switch dir {
+			case 'R':
+				dial = (dial + 1) % 100
+			case 'L':
+				dial = (dial - 1 + 100) % 100
+			}
+			if dial == 0 {
+				hit++
+			}
+		}
+	}
+
+	fmt.Println("# Part 2")
+	fmt.Println(hit)
+}