complete day 11 part 1

11 months ago · 5722d9106c
6 changed files with 403 additions and 0 deletions
--- a/day11.go
+++ b/day11.go
@ -0,0 +1,101 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"fmt"
+	"io"
+	"unicode"
+)
+
+type galaxy struct {
+	val byte // either '#' or '.'
+	x   int
+	y   int
+}
+
+func galaxyDistance(g1, g2 galaxy, blankRows, blankColumns []int) int {
+	maxX, minX := maxmin(g1.x, g2.x)
+
+	// g2.y will always be greater than g1.y
+	diffy := g2.y - g1.y
+	diffx := maxX - minX
+
+	for _, col := range blankColumns {
+		if maxX > col && minX < col {
+			diffy++
+		}
+	}
+
+	for _, row := range blankRows {
+		if g2.y > row && g1.y < row {
+			diffx++
+		}
+	}
+
+	return diffy + diffx
+}
+
+type day11 struct{}
+
+func (d day11) solve1(r io.Reader) string {
+	scanner := bufio.NewScanner(r)
+	space := make([][]galaxy, 0, 50)
+	galaxies := make([]galaxy, 0, 50)
+
+	blankRows := make([]int, 0, 10)
+	blankColumns := make([]int, 0, 10)
+
+	for y := 0; scanner.Scan(); y++ {
+		layer := make([]galaxy, 0, 50)
+		bytes := bytes.TrimFunc(scanner.Bytes(), unicode.IsSpace)
+
+		seenGalaxy := false
+		for x, c := range bytes {
+			galaxy := galaxy{x: x, y: y, val: c}
+			layer = append(layer, galaxy)
+
+			// only galaxies get tracked in
+			// the galaxy slice
+			if c == '#' {
+				galaxies = append(galaxies, galaxy)
+				seenGalaxy = true
+			}
+
+		}
+		space = append(space, layer)
+
+		if !seenGalaxy {
+			blankRows = append(blankRows, y)
+		}
+	}
+
+	for i := 0; i < len(space[0]); i++ {
+		seenGalaxy := false
+		for j := range space {
+			if space[j][i].val == '#' {
+				seenGalaxy = true
+				break
+			}
+		}
+
+		if !seenGalaxy {
+			blankColumns = append(blankColumns, i)
+		}
+	}
+
+	sum := 0
+	for i := 0; i < len(galaxies)-1; i++ {
+		for j := i + 1; j < len(galaxies); j++ {
+			g1 := galaxies[i]
+			g2 := galaxies[j]
+			sum += galaxyDistance(g1, g2, blankRows, blankColumns)
+		}
+	}
+
+	return fmt.Sprintf("%d", sum)
+}
+
+func (d day11) solve2(r io.Reader) string {
+	return "incomplete"
+}
--- a/input/11-1
+++ b/input/11-1
@ -0,0 +1,140 @@
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+.............................#..................................................................................#...........................
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+...............................................................................#............................................................
+.........................#.................................................................#.......................................#........
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+........#............#.............#.........#.......#...............................................................#......................
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+.................#............................................................................#.........................................#...
--- a/input/11-2
+++ b/input/11-2
@ -0,0 +1,140 @@
+.................................#.....................................................#..............................................#.....
+..........#.........#..........................................#............................................................................
+..........................................................#.......................................................#............#............
+..#.................................#........................................#.............#.........#...................#..................
+..............#............................#..........#.........................................#..........#................................
+.........................#......................#........................#..................................................................
+.......................................#....................#...............................................................................
+..............................#.................................................................................................#...........
+...................#..............................................#...............#.....................#.........#........................#
+..#......................................................#..................................................................................
+.....................................#...................................................#.........#......................#.................
+.......#...................................#.......#...................#......#.............................................................
+.....................#.....................................................................................#..................#.......#.....
+............................................................................................#...............................................
+..........................#............#....................................................................................................
+...................................................................................#..................#..........#...............#..........
+#........................................................................................#............................#.....................
+........#...........#...............#.............................#...........#.................#....................................#......
+..............................#.............................#...............................................................................
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+.........................................#........#............#........#.................#.................................................
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+.............................................................#.....#.............#...............#..........................................
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+.........................................................#..................................................................................
+..............#.........................#.......................#...........................................................................
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+.............................................................................................#..............................................
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+.....#......................................#..............#........................#...............................#.....#.............#...
+.......................#.............#...............#......................................................................................
+..................#.............#.................................#..........#..............................................................
+................................................#.......................................................#........#.............#...........#
+...#.......................#................................................................................................................
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+..#..............#.............................#...................#.........#....................................#............#............
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+...............#.....................#......................................................................................................
+.............................#..................................................................................#...........................
+...#...................................................#..............#.........................#.......#...................................
+...............................................................................#............................................................
+.........................#.................................................................#.......................................#........
+..............................................................#...............................................................#.............
+........#............#.............#.........#.......#...............................................................#......................
+.......................................................................#...............#...........#........................................
+....#........#................#.........#.......................................#........................#..................................
+..............................................................................................................#.............#...............
+............................................................................................................................................
+.........................#.....................................#..........#.......................................................#.........
+.........#...................................#..............................................................................................
+.......................................#..........#.........................................................#...............................
+.#............#............................................#..........#................#...........................#........................
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+........................................................................................................#...............................#...
+......#............................#...........................#..............................#..................................#..........
+......................#..........................................................................................#......#...................
+............................................#.....#......................#...........................#......................................
+...............#............#............................#.........................#........................................................
+........................................#............................................................................#......................
+........#...........................................................#...................#......................#..................#.........
+........................#.............................#............................................#........................................
+...............................#.............#..............#.............................................................#.................
+.................#............................................................................#.........................................#...
--- a/main.go
+++ b/main.go
@ -30,6 +30,7 @@ var (
 		&day08{},
 		&day09{},
 		&day10{},
+		&day11{},
 	}
 )

--- a/main_test.go
+++ b/main_test.go
@ -177,5 +177,19 @@ ZZZ = (ZZZ, ZZZ)`,
 			       LJ...`,
 			ans1: "8",
 		},
+		{
+			// day 11
+			inp1: `...#......
+    		       .......#..
+    		       #.........
+    		       ..........
+    		       ......#...
+    		       .#........
+    		       .........#
+    		       ..........
+    		       .......#..
+    		       #...#.....`,
+			ans1: "374",
+		},
 	}
 )
--- a/parse.go
+++ b/parse.go
@ -48,3 +48,10 @@ func reverseSlice[T any](s []T) {
 		s[i], s[j] = s[j], s[i]
 	}
 }
+
+func maxmin(v1, v2 int) (int, int) {
+    if v1 > v2 {
+        return v1, v2
+    }
+    return v2, v1
+}