Day 3 solution.

2018/day03-2.go

@@ -0,0 +1,34 @@
+package main
+
+import (
+	"fmt"
+
+	"internal/fabric"
+	"internal/util"
+)
+
+func main() {
+	data := util.ReadInput()
+	claims, maxX, maxY := fabric.ParseClaims(data)
+	fabric.PopulateGrid(claims, maxX, maxY) // ignoring return value because we only want the side effect here
+
+	id := -1
+	count := 0
+	for _, claim := range claims {
+		if !claim.Overlaps {
+			id = claim.ID
+			count++
+		}
+	}
+
+	if count > 1 {
+		fmt.Printf("%d claims detected no overlap. :(\n", count)
+		return
+	}
+	if count == 0 {
+		fmt.Println("All claims overlapped. :(")
+		return
+	}
+
+	fmt.Println(id)
+}