From 457c0bc2afee3b6e2659f829663d36b90dc31074 Mon Sep 17 00:00:00 2001
From: Julien Dessaux
Date: Tue, 14 Dec 2021 00:28:54 +0100
Subject: Added solutions for 13th day: Transparent Origami

---
 2021/13/example   |  21 ++
 2021/13/first.go  | 108 +++++++
 2021/13/input     | 916 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2021/13/second.go |  98 ++++++
 4 files changed, 1143 insertions(+)
 create mode 100644 2021/13/example
 create mode 100644 2021/13/first.go
 create mode 100644 2021/13/input
 create mode 100644 2021/13/second.go

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
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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("---")
+}
-- 
cgit v1.2.3