fastest map version

05/main.go

@@ -42,12 +42,12 @@ type point struct {
 }
 
 type grid struct {
-	m map[point]int
+	m map[int]int
 }
 
 func (g *grid) AddLine(start, end point, includeHorizontal bool) {
 	for _, p := range LineFromPoints(start, end, includeHorizontal) {
-		g.m[p]++
+		g.m[p.x+p.y*1000]++
 	}
 }
 
@@ -109,7 +109,7 @@ func partOne() {
 	scanner := makeScanner(false)
 
 	grid := &grid{
-		m: map[point]int{},
+		m: make(map[int]int, 1000),
 	}
 	for scanner.Scan() {
 		line := scanner.Text()
@@ -129,7 +129,7 @@ func partTwo() {
 	scanner := makeScanner(false)
 
 	grid := &grid{
-		m: map[point]int{},
+		m: make(map[int]int, 1000),
 	}
 	for scanner.Scan() {
 		line := scanner.Text()