starting with 2025, directory is a mess, will address later

2025/01.go

@@ -0,0 +1,129 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"io"
+	"os"
+	"strconv"
+	"strings"
+)
+
+var _ = strings.NewReader
+
+func openf(path string) io.Reader {
+	f, err := os.Open(path)
+	if err != nil {
+		panic(err)
+	}
+	return f
+}
+
+func main() {
+	i := openf("inputs/0101.txt")
+	_ = i
+	t := strings.NewReader(`L68
+L30
+R48
+L5
+R60
+L55
+L1
+L99
+R14
+L82
+`)
+
+	//fmt.Println(puzzle_0101(i))
+	fmt.Println(puzzle_0102(t))
+	fmt.Println(puzzle_0102(i))
+}
+
+func puzzle_0101(r io.Reader) string {
+
+	turn := func(position, distance int) int {
+		n := position + distance
+		for n > 99 {
+			n -= 100
+		}
+
+		for n < 0 {
+			n += 100
+		}
+		return n
+	}
+
+	p := 50
+	var total int
+	s := bufio.NewScanner(r)
+	for s.Scan() {
+		if p == 0 {
+			total++
+		}
+
+		l := s.Text()
+		dir, dig := l[0], l[1:]
+		n, _ := strconv.Atoi(dig)
+		switch dir {
+		case 'R':
+		case 'L':
+			n = -n
+		}
+
+		p = turn(p, n)
+
+	}
+	return strconv.Itoa(total)
+}
+
+func puzzle_0102(r io.Reader) string {
+
+	turnR := func(position, distance int) (pos, clicks int) {
+		clicks = distance / 100
+		r := distance % 100
+		pos = position + r
+		if pos > 99 {
+			pos = pos-100
+			if pos != 0 {
+			clicks++
+}
+		}
+		return pos, clicks
+	}
+
+	turnL := func(position, distance int) (pos, clicks int) {
+		clicks = distance / 100
+		r := distance % 100
+		pos = position - r
+		if pos < 0 {
+			pos = 100+pos
+			if position != 0 {
+			clicks++
+}
+		}
+
+		return pos, clicks
+	}
+
+	p := 50
+	var total, clicks int
+	s := bufio.NewScanner(r)
+	for s.Scan() {
+		l := s.Text()
+		dir, dig := l[0], l[1:]
+		n, _ := strconv.Atoi(dig)
+		switch dir {
+		case 'R':
+			p, clicks = turnR(p, n)
+		case 'L':
+			p, clicks = turnL(p, n)
+		}
+
+		total += clicks
+		if p == 0 { total++ }
+
+		//fmt.Printf("INST %s, POS %d, CLICKS %d, TOTAL %d\n", l, p, clicks, total)
+
+	}
+	return strconv.Itoa(total)
+}