First four days

Signed-off-by: Ettore <noettore@gmail.com>

2018/day_03/main.go

@@ -0,0 +1,71 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+	"strconv"
+	"strings"
+)
+
+type claim struct {
+	x           int
+	y           int
+	len         int
+	height      int
+	overlapping bool
+}
+
+func main() {
+	var fabric [1000][1000]int
+	claims := make(map[int]*claim)
+	inchesCount := 0
+	file, err := os.Open("./input")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scan := bufio.NewScanner(file)
+
+	for scan.Scan() {
+		line := scan.Text()
+		line = strings.Join(strings.Fields(line), "")
+
+		info := strings.Split(line, "#")[1]
+		id, _ := strconv.Atoi(strings.Split(info, "@")[0])
+		measures := strings.Split(info, "@")[1]
+		xy := strings.Split(strings.Split(measures, ":")[0], ",")
+		dim := strings.Split(strings.Split(measures, ":")[1], "x")
+		x, _ := strconv.Atoi(xy[0])
+		y, _ := strconv.Atoi(xy[1])
+		len, _ := strconv.Atoi(dim[0])
+		height, _ := strconv.Atoi(dim[1])
+
+		newClaim := claim{x, y, len, height, false}
+
+		for i := x; i < x+len; i++ {
+			for j := y; j < y+height; j++ {
+				if fabric[i][j] == 0 {
+					fabric[i][j] = id
+				} else if fabric[i][j] != -1 {
+					claims[fabric[i][j]].overlapping = true
+					fabric[i][j] = -1
+					inchesCount++
+				}
+				if fabric[i][j] == -1 {
+					newClaim.overlapping = true
+				}
+			}
+		}
+		claims[id] = &newClaim
+	}
+	fmt.Printf("Part One: square inches of fabric within two or more claims %v\n", inchesCount)
+
+	for id, c := range claims {
+		if !c.overlapping {
+			fmt.Printf("Part Two: the id of the claim that doesn't overlap is %v\n", id)
+		}
+	}
+}