adventofcode/2018/day03-2.go

package main

import (
	"fmt"

	"internal/day03"
	"internal/util"
)

func main() {
	data := util.ReadInput()
	claims, maxX, maxY := day03.ParseClaims(data)
	day03.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)
}