feat(angch/2025-05): Initial

Author: angch

angch/2025-05/main.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/angch/adventofcode/angch/span"
+)
+
+func day5(file string) (part1, part2 int) {
+	f, err := os.Open(file)
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer f.Close()
+	scanner := bufio.NewScanner(f)
+
+	spans := [][2]int{}
+	for scanner.Scan() {
+		t := scanner.Text()
+		_ = t
+		if t == "" {
+			break
+		}
+		l_, r_, ok := strings.Cut(t, "-")
+		_ = ok
+		l, _ := strconv.Atoi(l_)
+		r, _ := strconv.Atoi(r_)
+		spans = append(spans, [2]int{l, r})
+	}
+	// log.Println(spans)
+
+	for scanner.Scan() {
+		t := scanner.Text()
+		_ = t
+		i, _ := strconv.Atoi(t)
+		for _, v := range spans {
+			if i >= v[0] && i <= v[1] {
+				part1++
+				break
+			}
+		}
+	}
+
+	s2 := span.NewSpans[bool]()
+	for _, v := range spans {
+		s2 = s2.AddCompress(v[0], v[1], true)
+		log.Printf("%+v\n", s2)
+	}
+	for _, v := range s2 {
+		part2 += v.To - v.From + 1
+	}
+
+	return
+}
+
+func main() {
+	log.SetFlags(log.Lshortfile | log.LstdFlags)
+	t1 := time.Now()
+	part1, part2 := day5("test.txt")
+	fmt.Println(part1, part2)
+	if part1 != 3 || part2 != 14 {
+		log.Fatal("Test failed ", part1, part2)
+	}
+
+	part1, part2 = day5("input.txt")
+	fmt.Println(part1, part2)
+	fmt.Println("Elapsed time:", time.Since(t1))
+}

angch/2025-05/test.txt

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32