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-rw-r--r--2021/13/example21
-rw-r--r--2021/13/first.go108
-rw-r--r--2021/13/input916
-rw-r--r--2021/13/second.go98
4 files changed, 1143 insertions, 0 deletions
diff --git a/2021/13/example b/2021/13/example
new file mode 100644
index 0000000..282114c
--- /dev/null
+++ b/2021/13/example
@@ -0,0 +1,21 @@
+6,10
+0,14
+9,10
+0,3
+10,4
+4,11
+6,0
+6,12
+4,1
+0,13
+10,12
+3,4
+3,0
+8,4
+1,10
+2,14
+8,10
+9,0
+
+fold along y=7
+fold along x=5
diff --git a/2021/13/first.go b/2021/13/first.go
new file mode 100644
index 0000000..34ab6fd
--- /dev/null
+++ b/2021/13/first.go
@@ -0,0 +1,108 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "strconv"
+ "strings"
+)
+
+var (
+ dots [][]bool
+ width = -1
+ height = -1
+)
+
+func min(a, b int) int {
+ if a < b {
+ return a
+ }
+ return b
+}
+
+func foldx(n int) {
+ for y := 0; y < height; y++ {
+ if len(dots[y]) < n {
+ continue
+ }
+ if len(dots[y]) < width {
+ dots[y] = append(dots[y], make([]bool, width-len(dots[y])+1)...)
+ }
+ for i := 1; i <= n; i++ {
+ if dots[y][n+i] {
+ dots[y][n-i] = true
+ }
+ }
+ }
+ width = n
+}
+
+func foldy(n int) {
+ for i := 1; i <= n; i++ {
+ dots[n-i] = append(dots[n-i], make([]bool, width-len(dots[n-i])+1)...)
+ for x := 0; x < len(dots[n+i]); x++ {
+ if dots[n+i][x] {
+ dots[n-i][x] = true
+ }
+ }
+ }
+ height = n
+}
+
+func main() {
+ scanner := bufio.NewScanner(os.Stdin)
+ for scanner.Scan() {
+ line := strings.Split(scanner.Text(), ",")
+ if len(line) < 2 {
+ break
+ }
+ x, _ := strconv.Atoi(line[0])
+ y, _ := strconv.Atoi(line[1])
+ if y >= height {
+ dots = append(dots, make([][]bool, y-height+1)...)
+ height = y + 1
+ }
+ if x >= len(dots[y]) {
+ dots[y] = append(dots[y], make([]bool, x-len(dots[y])+1)...)
+ if x >= width {
+ width = x + 1
+ }
+ }
+ dots[y][x] = true
+ }
+ for scanner.Scan() {
+ line := strings.Split(scanner.Text(), "=")
+ letter := line[0][11]
+ n, _ := strconv.Atoi(line[1])
+ if letter == 'y' {
+ foldy(n)
+ } else {
+ foldx(n)
+ }
+ for y := 0; y < height; y++ {
+ w := min(width, len(dots[y]))
+ for x := 0; x < w; x++ {
+ if dots[y][x] {
+ fmt.Printf("#")
+ } else {
+ fmt.Printf(".")
+ }
+ }
+ fmt.Println()
+ }
+ fmt.Println()
+ fmt.Println("---")
+ break
+ }
+ score := 0
+ for y := 0; y < height; y++ {
+ w := min(width, len(dots[y]))
+ for x := 0; x < w; x++ {
+ if dots[y][x] {
+ score++
+ }
+ }
+ }
+ fmt.Println(score)
+}
diff --git a/2021/13/input b/2021/13/input
new file mode 100644
index 0000000..aef0a4a
--- /dev/null
+++ b/2021/13/input
@@ -0,0 +1,916 @@
+1213,736
+1158,890
+626,303
+98,10
+878,268
+1208,143
+112,400
+865,894
+1218,179
+1089,418
+535,886
+726,515
+1263,786
+589,270
+80,518
+288,322
+1101,483
+989,308
+1002,707
+467,18
+1036,364
+552,591
+445,280
+912,40
+1268,761
+984,47
+883,574
+815,784
+719,236
+865,166
+836,581
+656,735
+228,264
+23,466
+1099,515
+1284,665
+432,268
+195,493
+1001,308
+430,222
+1294,537
+427,646
+574,381
+1116,829
+1143,808
+950,578
+293,579
+28,751
+169,341
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+257,721
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+139,751
+448,782
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/2021/13/second.go b/2021/13/second.go
new file mode 100644
index 0000000..978d521
--- /dev/null
+++ b/2021/13/second.go
@@ -0,0 +1,98 @@
+package main
+
+import (
+ "bufio"
+ "fmt"
+ "os"
+ "strconv"
+ "strings"
+)
+
+var (
+ dots [][]bool
+ width = -1
+ height = -1
+)
+
+func min(a, b int) int {
+ if a < b {
+ return a
+ }
+ return b
+}
+
+func foldx(n int) {
+ for y := 0; y < height; y++ {
+ if len(dots[y]) < n {
+ continue
+ }
+ for i := 1; i <= n; i++ {
+ if dots[y][n+i] {
+ dots[y][n-i] = true
+ }
+ }
+ }
+ width = n
+}
+
+func foldy(n int) {
+ for i := 1; i <= n; i++ {
+ for x := 0; x < len(dots[n+i]); x++ {
+ if dots[n+i][x] {
+ dots[n-i][x] = true
+ }
+ }
+ }
+ height = n
+}
+
+func main() {
+ scanner := bufio.NewScanner(os.Stdin)
+ for scanner.Scan() {
+ line := strings.Split(scanner.Text(), ",")
+ if len(line) < 2 {
+ break
+ }
+ x, _ := strconv.Atoi(line[0])
+ y, _ := strconv.Atoi(line[1])
+ if y >= height {
+ dots = append(dots, make([][]bool, y-height+1)...)
+ height = y + 1
+ }
+ if x >= len(dots[y]) {
+ dots[y] = append(dots[y], make([]bool, x-len(dots[y])+1)...)
+ if x >= width {
+ width = x + 1
+ }
+ }
+ dots[y][x] = true
+ }
+ for y := 0; y < height; y++ {
+ if len(dots[y]) <= width {
+ dots[y] = append(dots[y], make([]bool, width-len(dots[y])+1)...)
+ }
+ }
+ for scanner.Scan() {
+ line := strings.Split(scanner.Text(), "=")
+ letter := line[0][11]
+ n, _ := strconv.Atoi(line[1])
+ if letter == 'y' {
+ foldy(n)
+ } else {
+ foldx(n)
+ }
+ }
+ for y := 0; y < height; y++ {
+ w := min(width, len(dots[y]))
+ for x := 0; x < w; x++ {
+ if dots[y][x] {
+ fmt.Printf("#")
+ } else {
+ fmt.Printf(".")
+ }
+ }
+ fmt.Println()
+ }
+ fmt.Println()
+ fmt.Println("---")
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-23 12:42:22 +0000