days 8 and 9

day08/day08.py

@@ -0,0 +1,86 @@
+import re
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("filename", help="the file from which to take data")
+args = parser.parse_args()
+
+with open(args.filename, "r") as f: contents = f.read()
+
+big_matrix = []
+
+for line in contents.strip().split("\n"):
+	big_matrix.append(list(map(int, line)))
+
+def print_matrix(mat):
+	for row in mat:
+		print("".join(map(str, row)))
+
+visibility = []
+for row in big_matrix:
+	new_row = []
+	for col in row:
+		new_row.append(False)
+	visibility.append(new_row)
+
+def update_visibility(trees, visibles):
+	top = -1
+	for i, t in enumerate(trees):
+		if t>top:
+			visibles[i] = True
+			top = t
+
+def watch_from_west(mat, vis):
+	for trees, vision in zip(mat, vis):
+		update_visibility(trees, vision)
+
+watch_from_west(big_matrix, visibility) # look from the west
+big_matrix = list(map(list, map(reversed, big_matrix)))
+visibility = list(map(list, map(reversed, visibility)))
+watch_from_west(big_matrix, visibility) # look from the east
+big_matrix = list(map(list,zip(*big_matrix)))
+visibility = list(map(list,zip(*visibility)))
+watch_from_west(big_matrix, visibility) # look from the... north?
+big_matrix = list(map(list, map(reversed, big_matrix)))
+visibility = list(map(list, map(reversed, visibility)))
+watch_from_west(big_matrix, visibility) # look from the south
+
+f_l = lambda i: filter(lambda x: x, i)
+
+answer = sum(map(len, map(list, map(f_l, visibility))))
+
+print_matrix(visibility)
+print("visible trees are {} in number".format(answer))
+
+
+def look(forest, x, y):
+	n = look_at(forest, x, y, 0, -1)
+	s = look_at(forest, x, y, 0, 1)
+	e = look_at(forest, x, y, 1, 0)
+	w = look_at(forest, x, y, -1, 0)
+
+	return n*s*e*w
+
+def look_at(forest, x, y, dx, dy):
+	count = 0
+	treehouse = forest[y][x]
+	tx = x + dx
+	ty = y + dy	
+	while tx >= 0 and tx < len(forest[0]) and ty >= 0 and ty < len(forest):
+		if forest[ty][tx] >= treehouse:
+	 		count += 1
+	 		break
+		count += 1 
+		tx = tx + dx
+		ty = ty + dy
+	return count
+
+best_score = 0
+for y, row in enumerate(big_matrix):
+	for x, tree in enumerate(row):
+		score = look(big_matrix, x, y)
+		if score > best_score:
+			best_score = score
+
+print("the highest score we found was {}".format(best_score))
+

day09/day09.py

@@ -0,0 +1,53 @@
+import re
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("filename", help="the file from which to take data")
+args = parser.parse_args()
+
+with open(args.filename, "r") as f: commands = f.readlines()
+
+visited = {(0,0)}
+head = (0, 0)
+tails = (0, 0)
+
+def walk(command, head, tail, visited):
+	direction, repeats = command.split(" ")
+	repeats = int(repeats)
+	first = True
+	while repeats > 0:
+		head = step(direction, head, tail)
+		tail = follow(head, tail)
+		first = False
+		visited = visited | {tail}
+
+		repeats -= 1
+
+		print("walking {} while head is {} and tail is {}".format(command, head, tail))
+	return head, tail, visited
+
+def follow(head, tail):
+	if head[0] < tail[0]-1 or head[0] > tail[0]+1 or \
+		head[1] < tail[1]-1 or head[1] > tail[1]+1:
+		if head[0] < tail[0]: tail = (tail[0]-1, tail[1])
+		if head[0] > tail[0]: tail = (tail[0]+1, tail[1])
+		if head[1] < tail[1]: tail = (tail[0], tail[1]-1)
+		if head[1] > tail[1]: tail = (tail[0], tail[1]+1)
+	return tail
+
+def step(direction, head, tail):
+	match direction:
+		case 'R': return (head[0]+1, head[1])
+		case 'L': return (head[0]-1, head[1])
+		case 'U': return (head[0], head[1]+1)
+		case 'D': return (head[0], head[1]-1)
+		case _: return head
+
+print("{}".format(visited))
+
+for command in commands:
+	head, tail, visited = walk(command, head, tail, visited)
+
+print("{}".format(visited))
+
+print("visited {} locations".format(len(visited)))

day09/day09b.py

@@ -0,0 +1,53 @@
+import re
+import argparse
+
+parser = argparse.ArgumentParser()
+parser.add_argument("filename", help="the file from which to take data")
+args = parser.parse_args()
+
+with open(args.filename, "r") as f: commands = f.readlines()
+
+visited = {(0,0)}
+head = (0, 0)
+tails = [(0, 0)]*9
+
+def walk(command, head, tails, visited):
+	direction, repeats = command.split(" ")
+	repeats = int(repeats)
+	first = True
+	while repeats > 0:
+		head = step(direction, head)
+		for i in range(len(tails)):
+			if i==0:
+				h = head
+			else:
+				h = tails[i-1]
+			tails[i] = follow(h, tails[i])
+		first = False
+		visited = visited | {tails[-1]}
+
+		repeats -= 1
+
+	return head, tails, visited
+
+def follow(head, tail):
+	if head[0] < tail[0]-1 or head[0] > tail[0]+1 or \
+		head[1] < tail[1]-1 or head[1] > tail[1]+1:
+		if head[0] < tail[0]: tail = (tail[0]-1, tail[1])
+		if head[0] > tail[0]: tail = (tail[0]+1, tail[1])
+		if head[1] < tail[1]: tail = (tail[0], tail[1]-1)
+		if head[1] > tail[1]: tail = (tail[0], tail[1]+1)
+	return tail
+
+def step(direction, head):
+	match direction:
+		case 'R': return (head[0]+1, head[1])
+		case 'L': return (head[0]-1, head[1])
+		case 'U': return (head[0], head[1]+1)
+		case 'D': return (head[0], head[1]-1)
+		case _: return head
+
+for command in commands:
+	head, tails, visited = walk(command, head, tails, visited)
+
+print("visited {} locations".format(len(visited)))

day10/.gitignore

@@ -0,0 +1,29 @@
+### IntelliJ IDEA ###
+out/
+!**/src/main/**/out/
+!**/src/test/**/out/
+
+### Eclipse ###
+.apt_generated
+.classpath
+.factorypath
+.project
+.settings
+.springBeans
+.sts4-cache
+bin/
+!**/src/main/**/bin/
+!**/src/test/**/bin/
+
+### NetBeans ###
+/nbproject/private/
+/nbbuild/
+/dist/
+/nbdist/
+/.nb-gradle/
+
+### VS Code ###
+.vscode/
+
+### Mac OS ###
+.DS_Store

day10/.idea/.gitignore

@@ -0,0 +1,8 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Editor-based HTTP Client requests
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml

day10/.idea/codeStyles/Project.xml

@@ -0,0 +1,10 @@
+<component name="ProjectCodeStyleConfiguration">
+  <code_scheme name="Project" version="173">
+    <JetCodeStyleSettings>
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </JetCodeStyleSettings>
+    <codeStyleSettings language="kotlin">
+      <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
+    </codeStyleSettings>
+  </code_scheme>
+</component>

day10/.idea/codeStyles/codeStyleConfig.xml

@@ -0,0 +1,5 @@
+<component name="ProjectCodeStyleConfiguration">
+  <state>
+    <option name="USE_PER_PROJECT_SETTINGS" value="true" />
+  </state>
+</component>

day10/.idea/inspectionProfiles/Project_Default.xml

@@ -0,0 +1,6 @@
+<component name="InspectionProjectProfileManager">
+  <profile version="1.0">
+    <option name="myName" value="Project Default" />
+    <inspection_tool class="ReplaceUntilWithRangeUntil" enabled="true" level="WEAK WARNING" enabled_by_default="true" />
+  </profile>
+</component>

day10/.idea/kotlinc.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Kotlin2JvmCompilerArguments">
+    <option name="jvmTarget" value="1.8" />
+  </component>
+  <component name="KotlinCommonCompilerArguments">
+    <option name="apiVersion" value="1.9" />
+    <option name="languageVersion" value="1.9" />
+  </component>
+</project>

day10/.idea/libraries/KotlinJavaRuntime.xml

@@ -0,0 +1,26 @@
+<component name="libraryTable">
+  <library name="KotlinJavaRuntime" type="repository">
+    <properties maven-id="org.jetbrains.kotlin:kotlin-stdlib-jdk8:1.9.0" />
+    <CLASSES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.9.0/kotlin-stdlib-jdk8-1.9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.9.0/kotlin-stdlib-1.9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.9.0/kotlin-stdlib-common-1.9.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.9.0/kotlin-stdlib-jdk7-1.9.0.jar!/" />
+    </CLASSES>
+    <JAVADOC>
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.9.0/kotlin-stdlib-jdk8-1.9.0-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.9.0/kotlin-stdlib-1.9.0-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.9.0/kotlin-stdlib-common-1.9.0-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-javadoc.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.9.0/kotlin-stdlib-jdk7-1.9.0-javadoc.jar!/" />
+    </JAVADOC>
+    <SOURCES>
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk8/1.9.0/kotlin-stdlib-jdk8-1.9.0-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib/1.9.0/kotlin-stdlib-1.9.0-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-common/1.9.0/kotlin-stdlib-common-1.9.0-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/annotations/13.0/annotations-13.0-sources.jar!/" />
+      <root url="jar://$MAVEN_REPOSITORY$/org/jetbrains/kotlin/kotlin-stdlib-jdk7/1.9.0/kotlin-stdlib-jdk7-1.9.0-sources.jar!/" />
+    </SOURCES>
+  </library>
+</component>

day10/.idea/misc.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_21" default="true" project-jdk-name="openjdk-21" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

day10/.idea/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/day10.iml" filepath="$PROJECT_DIR$/day10.iml" />
+    </modules>
+  </component>
+</project>

day10/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

day10/day10.iml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/resources" type="java-resource" />
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+      <sourceFolder url="file://$MODULE_DIR$/test" isTestSource="true" />
+      <sourceFolder url="file://$MODULE_DIR$/testResources" type="java-test-resource" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

day10/src/Main.kt

@@ -0,0 +1,3 @@
+fun main() {
+    println("Hello World!")
+}