aoc2024/aocutils.py

@@ -86,7 +86,7 @@ def bench(part):
 
 
 if __name__ == "__main__":
-    day = 6
+    day = 9
     root = os.path.dirname(__file__)
     task_dir = os.path.join(root, f"day{day}")
     generate_readme(task_dir, day)

aoc2024/day1/day1.go

@@ -1,4 +1,4 @@
-package day1
+package main
 
 import (
 	"bufio"

aoc2024/day6/day6.go

@@ -35,6 +35,7 @@ func main() {
 
 	startX, startY, direction := findStart(grid)
 
+	// part 1
 	start := time.Now()
 	_, visited := simulate(grid, startX, startY, direction)
 	lenv := make(map[[2]int]bool)
@@ -42,9 +43,12 @@ func main() {
 		lenv[[2]int{x[0], x[1]}] = true
 	}
 	part1_time := time.Since(start)
+
+	// part 2
 	start = time.Now()
 	loopPositions := findLoopObstacles(grid, [3]int{startX, startY, directionIndex(direction)}, visited)
 	part2_time := time.Since(start)
+
 	fmt.Println("Visited Distinct Positions:", len(lenv), "in time:", part1_time)
 	fmt.Println("Loop Positions:", len(loopPositions), "in time:", part2_time)
 }
@@ -95,6 +99,7 @@ func simulate(grid []string, startX, startY int, direction string) (bool, map[[3
 
 		if grid[nextY][nextX] == '#' {
 			direction = turnRight[direction]
+			continue
 		} else {
 			x, y = nextX, nextY
 		}

aoc2024/day7/README.md

@@ -0,0 +1,72 @@
+--- Day 7: Bridge Repair ---
+----------------------------
+
+The Historians take you to a familiar [rope bridge](/2022/day/9) over a river in the middle of a jungle. The Chief isn't on this side of the bridge, though; maybe he's on the other side?
+
+
+When you go to cross the bridge, you notice a group of engineers trying to repair it. (Apparently, it breaks pretty frequently.) You won't be able to cross until it's fixed.
+
+
+You ask how long it'll take; the engineers tell you that it only needs final calibrations, but some young elephants were playing nearby and *stole all the operators* from their calibration equations! They could finish the calibrations if only someone could determine which test values could possibly be produced by placing any combination of operators into their calibration equations (your puzzle input).
+
+
+For example:
+
+
+
+```
+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20
+
+```
+
+Each line represents a single equation. The test value appears before the colon on each line; it is your job to determine whether the remaining numbers can be combined with operators to produce the test value.
+
+
+Operators are *always evaluated left-to-right*, *not* according to precedence rules. Furthermore, numbers in the equations cannot be rearranged. Glancing into the jungle, you can see elephants holding two different types of operators: *add* (`+`) and *multiply* (`*`).
+
+
+Only three of the above equations can be made true by inserting operators:
+
+
+* `190: 10 19` has only one position that accepts an operator: between `10` and `19`. Choosing `+` would give `29`, but choosing `*` would give the test value (`10 * 19 = 190`).
+* `3267: 81 40 27` has two positions for operators. Of the four possible configurations of the operators, *two* cause the right side to match the test value: `81 + 40 * 27` and `81 * 40 + 27` both equal `3267` (when evaluated left-to-right)!
+* `292: 11 6 16 20` can be solved in exactly one way: `11 + 6 * 16 + 20`.
+
+
+The engineers just need the *total calibration result*, which is the sum of the test values from just the equations that could possibly be true. In the above example, the sum of the test values for the three equations listed above is `*3749*`.
+
+
+Determine which equations could possibly be true. *What is their total calibration result?*
+
+
+--- Part Two ---
+----------------
+
+The engineers seem concerned; the total calibration result you gave them is nowhere close to being within safety tolerances. Just then, you spot your mistake: some well-hidden elephants are holding a *third type of operator*.
+
+
+The [concatenation](https://en.wikipedia.org/wiki/Concatenation) operator (`||`) combines the digits from its left and right inputs into a single number. For example, `12 || 345` would become `12345`. All operators are still evaluated left-to-right.
+
+
+Now, apart from the three equations that could be made true using only addition and multiplication, the above example has three more equations that can be made true by inserting operators:
+
+
+* `156: 15 6` can be made true through a single concatenation: `15 || 6 = 156`.
+* `7290: 6 8 6 15` can be made true using `6 * 8 || 6 * 15`.
+* `192: 17 8 14` can be made true using `17 || 8 + 14`.
+
+
+Adding up all six test values (the three that could be made before using only `+` and `*` plus the new three that can now be made by also using `||`) produces the new *total calibration result* of `*11387*`.
+
+
+Using your new knowledge of elephant hiding spots, determine which equations could possibly be true. *What is their total calibration result?*
+
+

aoc2024/day7/day7.go

@@ -0,0 +1,105 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+)
+
+func main() {
+	args := flag.Bool("example", false, "example or input")
+	flag.Parse()
+	filename := "input.txt"
+	if *args {
+		filename = "example.txt"
+	}
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer file.Close()
+	scanner := bufio.NewScanner(file)
+	var equations []Equation
+	for scanner.Scan() {
+		line := strings.TrimSpace(scanner.Text())
+		equations = append(equations, parseEquation(line))
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	// part 1
+	start := time.Now()
+	totalSum := 0
+	for _, eq := range equations {
+		if checkOperators(eq.numbers, eq.testValue, 0, eq.numbers[0], false) {
+			totalSum += eq.testValue
+		}
+	}
+	end1 := time.Since(start)
+
+	// part2
+	start = time.Now()
+	totalSumWithMerged := 0
+	for _, eq := range equations {
+		if checkOperators(eq.numbers, eq.testValue, 0, eq.numbers[0], true) {
+			totalSumWithMerged += eq.testValue
+		}
+	}
+	end2 := time.Since(start)
+
+	fmt.Println("Total Sum:", totalSum, "with time:", end1)
+	fmt.Println("Total Sum With Merged:", totalSumWithMerged, "with time:", end2)
+}
+
+type Equation struct {
+	testValue int
+	numbers   []int
+}
+
+func parseEquation(line string) Equation {
+	parts := strings.Split(line, ":")
+	testValue, _ := strconv.Atoi(strings.TrimSpace(parts[0]))
+	numberStrings := strings.Fields(parts[1])
+	var numbers []int
+	for _, num := range numberStrings {
+		n, _ := strconv.Atoi(num)
+		numbers = append(numbers, n)
+	}
+	return Equation{testValue: testValue, numbers: numbers}
+}
+
+func checkOperators(numbers []int, target int, index int, currentValue int, merge bool) bool {
+	if index == len(numbers)-1 {
+		return currentValue == target
+	}
+
+	nextNumber := numbers[index+1]
+
+	// +
+	if checkOperators(numbers, target, index+1, currentValue+nextNumber, merge) {
+		return true
+	}
+
+	//  *
+	if checkOperators(numbers, target, index+1, currentValue*nextNumber, merge) {
+		return true
+	}
+
+	// ||
+	if merge {
+		merged, _ := strconv.Atoi(fmt.Sprintf("%v%v", currentValue, nextNumber))
+		if checkOperators(numbers, target, index+1, merged, merge) {
+			return true
+		}
+	}
+
+	return false
+}

aoc2024/day7/example.txt

@@ -0,0 +1,9 @@
+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20

aoc2024/day7/input.txt

@@ -0,0 +1,850 @@
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+6606690226623: 605 42 3 47 26 6 622
+4920367: 8 8 896 6 4 955 9 44 6 9
+221825533: 124 5 714 905 66 5 33
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+21776455040: 1 530 181 9 6 16 4 227
+17354: 3 4 49 63 6 5
+735393206: 2 44 647 39 3 204
+1093907608: 6 54 66 45 18 709 4 4
+11174: 15 8 9 79 74
+7621599: 18 679 374 78 4 87
+883869: 755 226 1 9 69
+887022: 69 812 6 10 22
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+135322472248: 6 89 4 5 69 631 9 566 5
+254597011: 751 9 356 941 41 10
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aoc2024/day8/README.md

@@ -0,0 +1,168 @@
+--- Day 8: Resonant Collinearity ---
+------------------------------------
+
+You find yourselves on the [roof](/2016/day/25) of a top-secret Easter Bunny installation.
+
+
+While The Historians do their thing, you take a look at the familiar *huge antenna*. Much to your surprise, it seems to have been reconfigured to emit a signal that makes people 0.1% more likely to buy Easter Bunny brand Imitation Mediocre Chocolate as a Christmas gift! Unthinkable!
+
+
+Scanning across the city, you find that there are actually many such antennas. Each antenna is tuned to a specific *frequency* indicated by a single lowercase letter, uppercase letter, or digit. You create a map (your puzzle input) of these antennas. For example:
+
+
+
+```
+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............
+
+```
+
+The signal only applies its nefarious effect at specific *antinodes* based on the resonant frequencies of the antennas. In particular, an antinode occurs at any point that is perfectly in line with two antennas of the same frequency - but only when one of the antennas is twice as far away as the other. This means that for any pair of antennas with the same frequency, there are two antinodes, one on either side of them.
+
+
+So, for these two antennas with frequency `a`, they create the two antinodes marked with `#`:
+
+
+
+```
+..........
+...#......
+..........
+....a.....
+..........
+.....a....
+..........
+......#...
+..........
+..........
+
+```
+
+Adding a third antenna with the same frequency creates several more antinodes. It would ideally add four antinodes, but two are off the right side of the map, so instead it adds only two:
+
+
+
+```
+..........
+...#......
+#.........
+....a.....
+........a.
+.....a....
+..#.......
+......#...
+..........
+..........
+
+```
+
+Antennas with different frequencies don't create antinodes; `A` and `a` count as different frequencies. However, antinodes *can* occur at locations that contain antennas. In this diagram, the lone antenna with frequency capital `A` creates no antinodes but has a lowercase-`a`-frequency antinode at its location:
+
+
+
+```
+..........
+...#......
+#.........
+....a.....
+........a.
+.....a....
+..#.......
+......A...
+..........
+..........
+
+```
+
+The first example has antennas with two different frequencies, so the antinodes they create look like this, plus an antinode overlapping the topmost `A`-frequency antenna:
+
+
+
+```
+......#....#
+...#....0...
+....#0....#.
+..#....0....
+....0....#..
+.#....A.....
+...#........
+#......#....
+........A...
+.........A..
+..........#.
+..........#.
+
+```
+
+Because the topmost `A`-frequency antenna overlaps with a `0`-frequency antinode, there are `*14*` total unique locations that contain an antinode within the bounds of the map.
+
+
+Calculate the impact of the signal. *How many unique locations within the bounds of the map contain an antinode?*
+
+
+--- Part Two ---
+----------------
+
+Watching over your shoulder as you work, one of The Historians asks if you took the effects of resonant harmonics into your calculations.
+
+
+Whoops!
+
+
+After updating your model, it turns out that an antinode occurs at *any grid position* exactly in line with at least two antennas of the same frequency, regardless of distance. This means that some of the new antinodes will occur at the position of each antenna (unless that antenna is the only one of its frequency).
+
+
+So, these three `T`-frequency antennas now create many antinodes:
+
+
+
+```
+T....#....
+...T......
+.T....#...
+.........#
+..#.......
+..........
+...#......
+..........
+....#.....
+..........
+
+```
+
+In fact, the three `T`-frequency antennas are all exactly in line with two antennas, so they are all also antinodes! This brings the total number of antinodes in the above example to `*9*`.
+
+
+The original example now has `*34*` antinodes, including the antinodes that appear on every antenna:
+
+
+
+```
+##....#....#
+.#.#....0...
+..#.#0....#.
+..##...0....
+....0....#..
+.#...#A....#
+...#..#.....
+#....#.#....
+..#.....A...
+....#....A..
+.#........#.
+...#......##
+
+```
+
+Calculate the impact of the signal using this updated model. *How many unique locations within the bounds of the map contain an antinode?*
+
+

aoc2024/day8/day8.go

@@ -0,0 +1,128 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"time"
+)
+
+var grid []string
+
+func main() {
+	example := flag.Bool("example", false, "example or input")
+	print := flag.Bool("print", false, "verbose")
+	flag.Parse()
+	filename := "input.txt"
+	if *example {
+		filename = "example.txt"
+	}
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		grid = append(grid, scanner.Text())
+	}
+
+	if err := scanner.Err(); err != nil {
+		fmt.Println(err)
+		return
+	}
+
+	antennas := findAntennas(grid)
+
+	// part 1
+	start := time.Now()
+	antinodes := generateAntinodes(grid, antennas, true)
+	end1 := time.Since(start)
+	if *print {
+		for p := range antinodes {
+			grid[p[1]] = replaceCharAt(grid[p[1]], p[0], '#')
+		}
+		for _, line := range grid {
+			fmt.Println(line)
+		}
+	}
+	fmt.Println("Total antinodes:", len(antinodes), "with time:", end1)
+
+	// part 2
+	start = time.Now()
+	antinodes2 := generateAntinodes(grid, antennas, false)
+	end2 := time.Since(start)
+	if *print {
+		for p := range antinodes2 {
+			grid[p[1]] = replaceCharAt(grid[p[1]], p[0], '#')
+		}
+		for _, line := range grid {
+			fmt.Println(line)
+		}
+	}
+	for _, anantenna := range antennas {
+		for _, point := range anantenna {
+			antinodes2[point] = true
+		}
+	}
+	fmt.Println("Total antinodes inline:", len(antinodes2), "with time:", end2)
+
+}
+
+func findAntennas(grid []string) map[rune][][2]int {
+	antennas := make(map[rune][][2]int)
+	for y, row := range grid {
+		for x, cell := range row {
+			if cell != '.' {
+				antennas[rune(cell)] = append(antennas[rune(cell)], [2]int{x, y})
+			}
+		}
+	}
+	return antennas
+}
+
+func generateAntinodes(grid []string, antennas map[rune][][2]int, ones bool) map[[2]int]bool {
+	antinodes := make(map[[2]int]bool)
+	height := len(grid)
+	width := len(grid[0])
+
+	for _, positions := range antennas {
+		for i := 0; i < len(positions); i++ {
+			for j := i + 1; j < len(positions); j++ {
+				x1, y1 := positions[i][0], positions[i][1]
+				x2, y2 := positions[j][0], positions[j][1]
+
+				dx, dy := x2-x1, y2-y1
+
+				addAntinodes(antinodes, x2, dx, y2, dy, width, height, ones)
+				addAntinodes(antinodes, x1, -dx, y1, -dy, width, height, ones)
+			}
+		}
+	}
+
+	return antinodes
+}
+
+func addAntinodes(antinodes map[[2]int]bool, x, dx, y, dy, width, height int, ones bool) {
+	ax, ay := x+dx, y+dy
+	for {
+		if ax >= 0 && ax < width && ay >= 0 && ay < height {
+			antinodes[[2]int{ax, ay}] = true
+			ax, ay = ax+dx, ay+dy
+			if ones {
+				break
+			}
+		} else {
+			break
+		}
+	}
+}
+
+func replaceCharAt(s string, index int, newChar rune) string {
+	runes := []rune(s)
+	runes[index] = newChar
+	return string(runes)
+}

aoc2024/day8/example.txt

@@ -0,0 +1,12 @@
+............
+........0...
+.....0......
+.......0....
+....0.......
+......A.....
+............
+............
+........A...
+.........A..
+............
+............

aoc2024/day8/input.txt

@@ -0,0 +1,50 @@
+....................8.D.........Y...........c.....
+....f.............D......O...........Y............
+.......z..........7.N..........g..................
+..........h...........9g.7....................Y...
+.............8...............................c....
+...9..8...............L........D....O.....l.......
+..........f.9.......h.........................l...
+...z...B..........................................
+.................M.....C.....OR7.Y..g..........l..
+........................M.......N.................
+...............h..................TD....H.........
+......z......M........C8.......N.......m.T........
+......O.......................................A...
+...........a...........h..........................
+................B..................j..............
+..............v..f..........g.....................
+.......N..........s.M.........n..............Q....
+...............s.........j.......................A
+......................a......................T...b
+........s....v......H..c..............j..i....m...
+.......................a........2H.......m..V.....
+................n.B..........o.....H......2.......
+.....3.......s.B..............x......S..K.........
+.3.G..................J................V...l.x..T.
+....3.......................E..................V..
+3..........................E..........V...i.......
+...............v.......n.E...................2.i..
+..F.........r.e......n....E...........A..Q.....K..
+..z................................A....Q.........
+.................................b..Q...d.Sw......
+..G...0..e............v.......Z...j.....m...b.....
+..y.............0.a.............................K.
+.............Gp....Z.................4......S.....
+....oJ....G........e.........Z............b.X.....
+C........o.r........WL..1.......X........K.....d..
+..................Z1.....r...............F........
+............L.4................1.6..............tF
+...y...............L......1............26.t.......
+......e.k......y........I......x......d........t.R
+.......0.........k...............d.........tWR..x.
+..........q.....r......J..................F..P..w.
+..........................5..........XwW..........
+...........0....y.............J.............6p....
+..q...k.......................I.....4........SR...
+.........q..o.......P................W............
+.............q.IP..............................p..
+.....k...................w.............X.......f..
+.............P...............4..................p.
+.................I..........5.....................
+.C.................................5...6..........

aoc2024/day9/README.md

@@ -0,0 +1,112 @@
+--- Day 9: Disk Fragmenter ---
+------------------------------
+
+Another push of the button leaves you in the familiar hallways of some friendly [amphipods](/2021/day/23)! Good thing you each somehow got your own personal mini submarine. The Historians jet away in search of the Chief, mostly by driving directly into walls.
+
+
+While The Historians quickly figure out how to pilot these things, you notice an amphipod in the corner struggling with his computer. He's trying to make more contiguous free space by compacting all of the files, but his program isn't working; you offer to help.
+
+
+He shows you the *disk map* (your puzzle input) he's already generated. For example:
+
+
+
+```
+2333133121414131402
+```
+
+The disk map uses a dense format to represent the layout of *files* and *free space* on the disk. The digits alternate between indicating the length of a file and the length of free space.
+
+
+So, a disk map like `12345` would represent a one-block file, two blocks of free space, a three-block file, four blocks of free space, and then a five-block file. A disk map like `90909` would represent three nine-block files in a row (with no free space between them).
+
+
+Each file on disk also has an *ID number* based on the order of the files as they appear *before* they are rearranged, starting with ID `0`. So, the disk map `12345` has three files: a one-block file with ID `0`, a three-block file with ID `1`, and a five-block file with ID `2`. Using one character for each block where digits are the file ID and `.` is free space, the disk map `12345` represents these individual blocks:
+
+
+
+```
+0..111....22222
+```
+
+The first example above, `2333133121414131402`, represents these individual blocks:
+
+
+
+```
+00...111...2...333.44.5555.6666.777.888899
+```
+
+The amphipod would like to *move file blocks one at a time* from the end of the disk to the leftmost free space block (until there are no gaps remaining between file blocks). For the disk map `12345`, the process looks like this:
+
+
+
+```
+0..111....22222
+02.111....2222.
+022111....222..
+0221112...22...
+02211122..2....
+022111222......
+
+```
+
+The first example requires a few more steps:
+
+
+
+```
+00...111...2...333.44.5555.6666.777.888899
+009..111...2...333.44.5555.6666.777.88889.
+0099.111...2...333.44.5555.6666.777.8888..
+00998111...2...333.44.5555.6666.777.888...
+009981118..2...333.44.5555.6666.777.88....
+0099811188.2...333.44.5555.6666.777.8.....
+009981118882...333.44.5555.6666.777.......
+0099811188827..333.44.5555.6666.77........
+00998111888277.333.44.5555.6666.7.........
+009981118882777333.44.5555.6666...........
+009981118882777333644.5555.666............
+00998111888277733364465555.66.............
+0099811188827773336446555566..............
+
+```
+
+The final step of this file-compacting process is to update the *filesystem checksum*. To calculate the checksum, add up the result of multiplying each of these blocks' position with the file ID number it contains. The leftmost block is in position `0`. If a block contains free space, skip it instead.
+
+
+Continuing the first example, the first few blocks' position multiplied by its file ID number are `0 * 0 = 0`, `1 * 0 = 0`, `2 * 9 = 18`, `3 * 9 = 27`, `4 * 8 = 32`, and so on. In this example, the checksum is the sum of these, `*1928*`.
+
+
+Compact the amphipod's hard drive using the process he requested. *What is the resulting filesystem checksum?* (Be careful copy/pasting the input for this puzzle; it is a single, very long line.)
+
+
+--- Part Two ---
+----------------
+
+Upon completion, two things immediately become clear. First, the disk definitely has a lot more contiguous free space, just like the amphipod hoped. Second, the computer is running much more slowly! Maybe introducing all of that [file system fragmentation](https://en.wikipedia.org/wiki/File_system_fragmentation) was a bad idea?
+
+
+The eager amphipod already has a new plan: rather than move individual blocks, he'd like to try compacting the files on his disk by moving *whole files* instead.
+
+
+This time, attempt to move whole files to the leftmost span of free space blocks that could fit the file. Attempt to move each file exactly once in order of *decreasing file ID number* starting with the file with the highest file ID number. If there is no span of free space to the left of a file that is large enough to fit the file, the file does not move.
+
+
+The first example from above now proceeds differently:
+
+
+
+```
+00...111...2...333.44.5555.6666.777.888899
+0099.111...2...333.44.5555.6666.777.8888..
+0099.1117772...333.44.5555.6666.....8888..
+0099.111777244.333....5555.6666.....8888..
+00992111777.44.333....5555.6666.....8888..
+
+```
+
+The process of updating the filesystem checksum is the same; now, this example's checksum would be `*2858*`.
+
+
+Start over, now compacting the amphipod's hard drive using this new method instead. *What is the resulting filesystem checksum?*

aoc2024/day9/day9.go

@@ -0,0 +1,151 @@
+package main
+
+import (
+	"bufio"
+	"flag"
+	"fmt"
+	"os"
+	"strconv"
+	"time"
+)
+
+func main() {
+	example := flag.Bool("example", false, "example or input")
+	flag.Parse()
+	filename := "input.txt"
+	if *example {
+		filename = "example.txt"
+	}
+	file, err := os.Open(filename)
+	if err != nil {
+		fmt.Println(err)
+		return
+	}
+	defer file.Close()
+
+	scanner := bufio.NewScanner(file)
+	scanner.Scan()
+	diskMap := scanner.Text()
+
+	// part 1
+	blocks := parseDiskMap(diskMap)
+	start := time.Now()
+	compactDisk(blocks)
+	checksum := calculateChecksum(blocks)
+	end1 := time.Since(start)
+
+	// part 2
+	blocks = parseDiskMap(diskMap)
+	start = time.Now()
+	compactDiskWholeFiles(blocks)
+	checksum2 := calculateChecksum(blocks)
+	end2 := time.Since(start)
+
+	fmt.Println("Part 1 CheckSum:", checksum, "with time:", end1)
+	fmt.Println("Part 2 CheckSum:", checksum2, "with time:", end2)
+
+}
+
+func parseDiskMap(diskMap string) []rune {
+	var blocks []rune
+	id := 0
+
+	for i, c := range diskMap {
+		length, _ := strconv.Atoi(string(c))
+
+		isFile := i%2 == 0
+		for j := 0; j < length; j++ {
+			if isFile {
+				blocks = append(blocks, rune('0'+id))
+			} else {
+				blocks = append(blocks, '.')
+			}
+		}
+		if isFile {
+			id++
+		}
+	}
+
+	return blocks
+}
+
+func compactDisk(blocks []rune) {
+	n := len(blocks)
+	j := 1
+	for i := n - 1; i >= 0; i-- {
+		if blocks[i] != '.' {
+			for j < i {
+				if blocks[j] == '.' {
+					blocks[j] = blocks[i]
+					blocks[i] = '.'
+					break
+				}
+				j++
+			}
+		}
+	}
+}
+
+func compactDiskWholeFiles(blocks []rune) {
+	whereFiles := make(map[int][2]int)
+	maxID := 0
+	ind := 0
+	for ind < len(blocks)-1 {
+		if blocks[ind] != '.' {
+			id := int(blocks[ind] - '0')
+			start := ind
+			for ind < len(blocks) && int(blocks[ind]-'0') == id {
+				ind++
+				// if ind == len(blocks)-1 {
+				// break
+				// }
+			}
+			end := ind
+			whereFiles[id] = [2]int{start, end}
+
+			if id > maxID {
+				maxID = id
+			}
+			continue
+		}
+		ind++
+	}
+
+	for id := maxID; id >= 0; id-- {
+		size, _ := whereFiles[id]
+		start, end := size[0], size[1]
+
+		fileSize := end - start
+
+		freeStart, freeSize := -1, 0
+		for i := 0; i < start; i++ {
+			if blocks[i] == '.' {
+				if freeStart == -1 {
+					freeStart = i
+				}
+				freeSize++
+				if freeSize >= fileSize {
+					for j := 0; j < fileSize; j++ {
+						blocks[freeStart+j] = rune('0' + id)
+						blocks[start+j] = '.'
+					}
+					maxID--
+					break
+				}
+			} else {
+				freeStart, freeSize = -1, 0
+			}
+		}
+	}
+}
+
+func calculateChecksum(blocks []rune) int {
+	checksum := 0
+	for i, block := range blocks {
+		if block != '.' {
+			id := int(block - '0')
+			checksum += i * id
+		}
+	}
+	return checksum
+}

aoc2024/day9/example.txt

@@ -0,0 +1 @@
+2333133121414131402

aoc2024/go.mod

@@ -1,5 +1,3 @@
 module aoc2024
 
 go 1.23.3
-
-require github.com/elliotchance/orderedmap/v3 v3.0.0

aoc2024/go.sum

@@ -1,10 +0,0 @@
-github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
-github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/elliotchance/orderedmap/v3 v3.0.0 h1:Yay/tDjX+vzza+Drcoo8VEbuBnOYGpgenCXWcpQSFDg=
-github.com/elliotchance/orderedmap/v3 v3.0.0/go.mod h1:G+Hc2RwaZvJMcS4JpGCOyViCnGeKf0bTYCGTO4uhjSo=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/stretchr/testify v1.7.1 h1:5TQK59W5E3v0r2duFAb7P95B6hEeOyEnHRa8MjYSMTY=
-github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
-gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=