re-organise repo

2022/go/day04/day04.go

@@ -0,0 +1,59 @@
+package day04
+
+import (
+	"strings"
+	"strconv"
+//	"fmt"
+
+	mapset "github.com/deckarep/golang-set/v2"
+
+)
+
+func Part1(input string) int {
+	var count int = 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		pairs := strings.Split(line, ",")
+		
+		pair1 := strings.Split(pairs[0], "-")
+		pair2 := strings.Split(pairs[1], "-")
+
+		p1set := mapset.NewSet[int](Range(pair1[0], pair1[1])...)
+		p2set := mapset.NewSet[int](Range(pair2[0], pair2[1])...)
+
+		if p1set.IsSubset(p2set) || p2set.IsSubset(p1set) {
+			count++
+		}
+	}
+	return count
+}
+
+func Part2(input string) int {
+	var count int = 0
+	lines := strings.Split(input, "\n")
+	for _, line := range lines {
+		pairs := strings.Split(line, ",")
+		
+		pair1 := strings.Split(pairs[0], "-")
+		pair2 := strings.Split(pairs[1], "-")
+
+		p1set := mapset.NewSet[int](Range(pair1[0], pair1[1])...)
+		p2set := mapset.NewSet[int](Range(pair2[0], pair2[1])...)
+
+		if len(p1set.Intersect(p2set).ToSlice()) > 0 {
+			count++
+		}
+	}
+	return count
+}
+
+func Range(start string, end string)[]int {
+	s, _ := strconv.Atoi(start)
+	e, _ := strconv.Atoi(end)
+
+	var r []int
+	for i := s; i <= e; i++ {
+		r = append(r, i)
+	}
+	return r
+}