Restyled README and file structure

Signed-off-by: Ettore Dreucci <ettore.dreucci@gmail.com>

2018/day_10/prova.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"os"
+)
+
+type point struct {
+	x, y   int
+	vx, vy int
+}
+
+func print(points []*point, xrange, yrange, x, y int) {
+	var res = make([][]string, yrange+1)
+	for i := range res {
+		res[i] = make([]string, xrange+1)
+	}
+	for i := 0; i < xrange+1; i++ {
+		for j := 0; j < yrange+1; j++ {
+			res[j][i] = " "
+		}
+	}
+	for _, p := range points {
+		res[(*p).y-y][(*p).x-x] = "*"
+	}
+	fmt.Println("Part 1: ")
+	for _, row := range res {
+		fmt.Println(row)
+	}
+}
+
+func min(a, b int) int {
+	if a < b {
+		return a
+	}
+	return b
+}
+
+func max(a, b int) int {
+	if a > b {
+		return a
+	}
+	return b
+}
+
+func move(points []*point, x, X, y, Y *int) {
+	var tx, tX, ty, tY int = 2147483647, -2147483648, 2147483647, -2147483648
+	for _, val := range points {
+		(*val).x += (*val).vx
+		(*val).y += (*val).vy
+		tx = min(tx, (*val).x)
+		tX = max(tX, (*val).x)
+		ty = min(ty, (*val).y)
+		tY = max(tY, (*val).y)
+	}
+	*x, *X, *y, *Y = tx, tX, ty, tY
+}
+
+func main() {
+
+	file, err := os.Open("input")
+	if err != nil {
+		log.Fatal(err)
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+
+	var points []*point
+
+	var x, X, y, Y int = 2147483647, -2147483648, 2147483647, -2147483648
+
+	for scanner.Scan() {
+		p := new(point)
+		line := scanner.Text()
+		fmt.Sscanf(line, "position=<%d, %d> velocity=<%d, %d>", &p.x, &p.y, &p.vx, &p.vy)
+		points = append(points, p)
+		x = min(x, (*p).x)
+		X = max(X, (*p).x)
+		y = min(y, (*p).y)
+		Y = max(Y, (*p).y)
+	}
+
+	var minAt, minVal int
+	minVal = (X - x) + (Y - y)
+
+	for i := 1; i <= 100000; i++ {
+		move(points, &x, &X, &y, &Y)
+		current := (X - x) + (Y - y)
+		if current < minVal {
+			minVal = current
+			minAt = i
+		}
+	}
+
+	var tx, tX, ty, tY int = 2147483647, -2147483648, 2147483647, -2147483648
+	for _, p := range points {
+		(*p).x = (*p).x - (100000-minAt)*(*p).vx
+		(*p).y = (*p).y - (100000-minAt)*(*p).vy
+		tx = min(tx, (*p).x)
+		tX = max(tX, (*p).x)
+		ty = min(ty, (*p).y)
+		tY = max(tY, (*p).y)
+	}
+
+	print(points, tX-tx, tY-ty, tx, ty)
+	fmt.Printf("Part 2: %v\n", minAt)
+}