From f15c44dc186eedbe248127797b6d42fbfcaa9589 Mon Sep 17 00:00:00 2001 From: Julien Dessaux Date: Thu, 9 Dec 2021 21:59:22 +0100 Subject: Added solutions for 9th day : minimums and basins in height map --- 2021/09/example | 5 +++ 2021/09/first.go | 69 ++++++++++++++++++++++++++++++++++++ 2021/09/first_v2.go | 64 +++++++++++++++++++++++++++++++++ 2021/09/input | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 2021/09/second.go | 85 ++++++++++++++++++++++++++++++++++++++++++++ 5 files changed, 323 insertions(+) create mode 100644 2021/09/example create mode 100644 2021/09/first.go create mode 100644 2021/09/first_v2.go create mode 100644 2021/09/input create mode 100644 2021/09/second.go diff --git a/2021/09/example b/2021/09/example new file mode 100644 index 0000000..6dee4a4 --- /dev/null +++ b/2021/09/example @@ -0,0 +1,5 @@ +2199943210 +3987894921 +9856789892 +8767896789 +9899965678 diff --git a/2021/09/first.go b/2021/09/first.go new file mode 100644 index 0000000..edfca87 --- /dev/null +++ b/2021/09/first.go @@ -0,0 +1,69 @@ +package main + +import ( + "bufio" + "fmt" + "os" +) + +// DOES NOT WORK!!! + +func countMins(prev []byte, prevS []bool) (score int) { + for i, v := range prevS { + if v { + fmt.Println(prev[i]) + score += int(prev[i]) + 1 + } + } + return +} + +func main() { + score := 0 + + s := bufio.NewScanner(os.Stdin) + s.Scan() + width := len(s.Text()) + prevS := make([]bool, width) + prev := make([]byte, width) + for i, ch := range s.Text() { + prev[i] = byte(ch) - '0' + if i == 0 { + prevS[i] = true + } else if prev[i] < prev[i-1] { + prevS[i-1] = false + prevS[i] = true + } + } + + curS := make([]bool, width) + cur := make([]byte, width) + fmt.Println(s.Text()) + for s.Scan() { + for i, ch := range s.Text() { + cur[i] = byte(ch) - '0' + if i > 0 && cur[i] < cur[i-1] { + curS[i-1] = false + if cur[i] < prev[i] { + prevS[i] = false + curS[i] = true + } else { + curS[i] = false + } + } else { + if cur[i] < prev[i] { + prevS[i] = false + } + curS[i] = false + } + } + fmt.Printf("%+v\n", prevS) + fmt.Println(s.Text()) + score += countMins(prev, prevS) + copy(prev, cur) + copy(prevS, curS) + } + score += countMins(prev, prevS) + fmt.Printf("%+v\n", prevS) + fmt.Println(score) +} diff --git a/2021/09/first_v2.go b/2021/09/first_v2.go new file mode 100644 index 0000000..0c11bcd --- /dev/null +++ b/2021/09/first_v2.go @@ -0,0 +1,64 @@ +package main + +import ( + "bufio" + "fmt" + "os" +) + +var ( + grid [][]byte = make([][]byte, 0) + width, height int +) + +func isMin(x, y int) bool { + var left, right, top, bottom byte + if x == 0 { + left = '9' + } else { + left = grid[x-1][y] + } + if x == height-1 { + right = '9' + } else { + right = grid[x+1][y] + } + if y == 0 { + top = '9' + } else { + top = grid[x][y-1] + } + if y == width-1 { + bottom = '9' + } else { + bottom = grid[x][y+1] + } + return grid[x][y] < top && grid[x][y] < bottom && grid[x][y] < left && grid[x][y] < right +} + +func main() { + s := bufio.NewScanner(os.Stdin) + s.Scan() + width = len(s.Text()) + for { + line := make([]byte, width) + for i, ch := range s.Text() { + line[i] = byte(ch) + } + grid = append(grid, line) + if !s.Scan() { + break + } + } + height = len(grid) + + score := 0 + for y := 0; y < width; y++ { + for x := 0; x < height; x++ { + if isMin(x, y) { + score += int(grid[x][y]-'0') + 1 + } + } + } + fmt.Println(score) +} diff --git a/2021/09/input b/2021/09/input new file mode 100644 index 0000000..c299a49 --- /dev/null +++ b/2021/09/input @@ -0,0 +1,100 @@ +9976557856799875679875642456989998767978931098989876587878999876565667896543210123567899876794310234 +8765432145789983989864321345978999954569532987679965426567899865423457899654329439698987665679442545 +9898553234567899898765432499767899895689549876567894312458998543212679998785698998999996543458953456 +8987668765679998769986753987656798799899698765456789101345697654323567899896797987899989542557894597 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left = grid[x-1][y] + } + if x == height-1 { + right = '9' + } else { + right = grid[x+1][y] + } + if y == 0 { + top = '9' + } else { + top = grid[x][y-1] + } + if y == width-1 { + bottom = '9' + } else { + bottom = grid[x][y+1] + } + return grid[x][y] < top && grid[x][y] < bottom && grid[x][y] < left && grid[x][y] < right +} + +type Min struct { + x, y int +} + +var minimums []Min + +func main() { + s := bufio.NewScanner(os.Stdin) + s.Scan() + width = len(s.Text()) + for { + line := make([]byte, width) + for i, ch := range s.Text() { + line[i] = byte(ch) + } + grid = append(grid, line) + if !s.Scan() { + break + } + } + height = len(grid) + + for y := 0; y < width; y++ { + for x := 0; x < height; x++ { + if isMin(x, y) { + minimums = append(minimums, Min{x, y}) + } + } + } + + basins := make([]int, 0) + for _, m := range minimums { + basins = append(basins, computeBasinSize(m.x, m.y)) + } + sort.Ints(basins) + basins = basins[len(basins)-3:] + fmt.Println(basins[0] * basins[1] * basins[2]) +} + +func computeBasinSize(x, y int) int { + if x < 0 || x >= height || y < 0 || y >= width || grid[x][y] == '9' { + return 0 + } + grid[x][y] = '9' + return 1 + computeBasinSize(x-1, y) + computeBasinSize(x+1, y) + computeBasinSize(x, y-1) + computeBasinSize(x, y+1) +} -- cgit v1.2.3