### ✨Added Day 9 Solution

main
parent 489bbbd1ca
commit a44f0957f7
3 changed files with 286 additions and 0 deletions
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Day 9/input
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Day 9/main.go

#### 78 Day 9/README.md Unescape Escape View File

 `@ -0,0 +1,78 @@` `# Day 9: Smoke Basin` ``` ``` `These caves seem to be [lava tubes](https://en.wikipedia.org/wiki/Lava_tube). Parts are even still volcanically active; small hydrothermal vents release smoke into the caves that slowly settles like rain.` ``` ``` `If you can model how the smoke flows through the caves, you might be able to avoid it and be that much safer. The submarine generates a heightmap of the floor of the nearby caves for you (your puzzle input).` ``` ``` `Smoke flows to the lowest point of the area it's in. For example, consider the following heightmap:` ``` ``` ````` `2199943210` `3987894921` `9856789892` `8767896789` `9899965678` ````` ``` ``` `Each number corresponds to the height of a particular location, where `9` is the highest and `0` is the lowest a location can be.` ``` ``` `Your first goal is to find the **low points** - the locations that are lower than any of its adjacent locations. Most locations have four adjacent locations (up, down, left, and right); locations on the edge or corner of the map have three or two adjacent locations, respectively. (Diagonal locations do not count as adjacent.)` ``` ``` `In the above example, there are **four** low points, all highlighted: two are in the first row (a `1` and a `0`), one is in the third row (a `5`), and one is in the bottom row (also a `5`). All other locations on the heightmap have some lower adjacent location, and so are not low points.` ``` ``` `The **risk level** of a low point is **1 plus its height**. In the above example, the risk levels of the low points are `2`, `1`, `6`, and `6`. The sum of the risk levels of all low points in the heightmap is therefore `15`.` ``` ``` `Find all of the low points on your heightmap. **What is the sum of the risk levels of all low points on your heightmap?**` ``` ``` `# Part Two` ``` ``` `Next, you need to find the largest basins so you know what areas are most important to avoid.` ``` ``` `A **basin** is all locations that eventually flow downward to a single low point. Therefore, every low point has a basin, although some basins are very small. Locations of height `9` do not count as being in any basin, and all other locations will always be part of exactly one basin.` ``` ``` `The **size** of a basin is the number of locations within the basin, including the low point. The example above has four basins.` ``` ``` `The top-left basin, size `3`:` ``` ``` ````` `2199943210` `3987894921` `9856789892` `8767896789` `9899965678` ````` ``` ``` `The top-right basin, size `9`:` ``` ``` ````` `2199943210` `3987894921` `9856789892` `8767896789` `9899965678` ````` ``` ``` `The middle basin, size `14`:` ``` ``` ````` `2199943210` `3987894921` `9856789892` `8767896789` `9899965678` ````` ``` ``` `The bottom-right basin, size `9`:` ``` ``` ````` `2199943210` `3987894921` `9856789892` `8767896789` `9899965678` ````` ``` ``` `Find the three largest basins and multiply their sizes together. In the above example, this is `9 * 14 * 9 = 1134`.` ``` ``` `**What do you get if you multiply together the sizes of the three largest basins?**` ``` ```

#### 100 Day 9/input Unescape Escape View File

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#### 108 Day 9/main.go Unescape Escape View File

 `@ -0,0 +1,108 @@` `package main` ``` ``` `import (` ` "bufio"` ` "fmt"` ` "os"` ` "sort"` ` "strconv"` `)` ``` ``` `func partOne(heightmap [][]uint8) {` ` riskLevel := 0` ` for y, _ := range heightmap {` ` for x, _ := range heightmap[y] {` ` if (y-1 >= 0 && heightmap[y][x] >= heightmap[y-1][x]) ||` ` (y+1 <= len(heightmap)-1 && heightmap[y][x] >= heightmap[y+1][x]) ||` ` (x-1 >= 0 && heightmap[y][x] >= heightmap[y][x-1]) ||` ` (x+1 <= len(heightmap[y])-1 && heightmap[y][x] >= heightmap[y][x+1]) {` ` continue` ` }` ``` ``` ` riskLevel += int(heightmap[y][x]) + 1` ` }` ` }` ``` ``` ` fmt.Printf("Part One Answer: %d\n", riskLevel)` `}` ``` ``` `func getBasinSize(heightmap [][]uint8, basinMap [][]bool, x int, y int) int {` ` basinMap[y][x] = true` ` basinSize := 1` ``` ``` ` if x-1 >= 0 && heightmap[y][x-1] != 9 && !basinMap[y][x-1] {` ` basinSize += getBasinSize(heightmap, basinMap, x-1, y)` ` }` ``` ``` ` if x+1 <= len(heightmap[y]) - 1 && heightmap[y][x+1] != 9 && !basinMap[y][x+1] {` ` basinSize += getBasinSize(heightmap, basinMap, x+1, y)` ` }` ``` ``` ` if y-1 >= 0 && heightmap[y-1][x] != 9 && !basinMap[y-1][x] {` ` basinSize += getBasinSize(heightmap, basinMap, x, y-1)` ` }` ``` ``` ` if y+1 <= len(heightmap) - 1 && heightmap[y+1][x] != 9 && !basinMap[y+1][x] {` ` basinSize += getBasinSize(heightmap, basinMap, x, y+1)` ` }` ``` ``` ` return basinSize` `}` ``` ``` `func partTwo(heightmap [][]uint8) {` ` basinMap := make([][]bool, len(heightmap))` ` for basinIndex, _ := range basinMap {` ` basinMap[basinIndex] = make([]bool, len(heightmap[0]))` ` }` ``` ``` ` basins := []int{}` ` for y, _ := range heightmap {` ` for x, _ := range heightmap[y] {` ` if heightmap[y][x] == 9 || basinMap[y][x] {` ` continue` ` }` ``` ``` ` basinSize := getBasinSize(heightmap, basinMap, x, y)` ``` ``` ` basins = append(basins, basinSize)` ` }` ` }` ``` ``` ` sort.Ints(basins)` ``` ``` ` fmt.Printf("Part Two Answer: %d\n", basins[len(basins) - 1] * basins[len(basins) - 2] * basins[len(basins) - 3])` `}` ``` ``` `func main() {` ` file, err := os.Open("./input")` ` if err != nil {` ` fmt.Printf("[Error] Unable to open file")` ` os.Exit(1)` ` }` ` defer file.Close()` ``` ``` ` heightmap := [][]uint8{}` ` y := 0` ` scanner := bufio.NewScanner(file)` ` for scanner.Scan() {` ` rowString := scanner.Text()` ` if len(rowString) == 0 {` ` continue` ` }` ``` ``` ` heightmap = append(heightmap, make([]uint8, len(rowString)))` ` for x, heightCharacter := range rowString {` ` height, err := strconv.Atoi(string(heightCharacter))` ` if err != nil {` ` fmt.Printf("[Error] Invalid height")` ` continue` ` }` ` heightmap[y][x] = uint8(height)` ` }` ``` ``` ` y += 1` ` }` ``` ``` ` partOne(heightmap)` ` partTwo(heightmap)` `}`