diff --git a/2025/01/cracking_code_interview_16_20_t9/build.gradle b/2025/01/cracking_code_interview_16_20_t9/build.gradle new file mode 100644 index 0000000..c3db9ad --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/build.gradle @@ -0,0 +1,18 @@ +plugins { + id 'java' +} + +repositories { + mavenCentral() +} + +dependencies { + implementation('ch.qos.logback:logback-classic:1.5.15') +} + +tasks.register('runDefault', JavaExec) { + classpath = sourceSets.main.runtimeClasspath + mainClass = 'pl.polgrabia.demos.crackingcodeinterview.t16x20.Program' + args "${System.getenv('LOCALAPPDATA')}/cracking_code_interview/t16x20/words.txt" + jvmArgs "-ea" +} \ No newline at end of file diff --git a/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.jar b/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.jar new file mode 100644 index 0000000..a4b76b9 Binary files /dev/null and b/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.jar differ diff --git a/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.properties b/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.properties new file mode 100644 index 0000000..9355b41 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/gradle/wrapper/gradle-wrapper.properties @@ -0,0 +1,7 @@ +distributionBase=GRADLE_USER_HOME +distributionPath=wrapper/dists +distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip +networkTimeout=10000 +validateDistributionUrl=true +zipStoreBase=GRADLE_USER_HOME +zipStorePath=wrapper/dists diff --git a/2025/01/cracking_code_interview_16_20_t9/gradlew b/2025/01/cracking_code_interview_16_20_t9/gradlew new file mode 100644 index 0000000..f5feea6 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/gradlew @@ -0,0 +1,252 @@ +#!/bin/sh + +# +# Copyright © 2015-2021 the original authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# +# SPDX-License-Identifier: Apache-2.0 +# + +############################################################################## +# +# Gradle start up script for POSIX generated by Gradle. +# +# Important for running: +# +# (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is +# noncompliant, but you have some other compliant shell such as ksh or +# bash, then to run this script, type that shell name before the whole +# command line, like: +# +# ksh Gradle +# +# Busybox and similar reduced shells will NOT work, because this script +# requires all of these POSIX shell features: +# * functions; +# * expansions «$var», «${var}», «${var:-default}», «${var+SET}», +# «${var#prefix}», «${var%suffix}», and «$( cmd )»; +# * compound commands having a testable exit status, especially «case»; +# * various built-in commands including «command», «set», and «ulimit». +# +# Important for patching: +# +# (2) This script targets any POSIX shell, so it avoids extensions provided +# by Bash, Ksh, etc; in particular arrays are avoided. +# +# The "traditional" practice of packing multiple parameters into a +# space-separated string is a well documented source of bugs and security +# problems, so this is (mostly) avoided, by progressively accumulating +# options in "$@", and eventually passing that to Java. +# +# Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS, +# and GRADLE_OPTS) rely on word-splitting, this is performed explicitly; +# see the in-line comments for details. +# +# There are tweaks for specific operating systems such as AIX, CygWin, +# Darwin, MinGW, and NonStop. +# +# (3) This script is generated from the Groovy template +# https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt +# within the Gradle project. +# +# You can find Gradle at https://github.com/gradle/gradle/. +# +############################################################################## + +# Attempt to set APP_HOME + +# Resolve links: $0 may be a link +app_path=$0 + +# Need this for daisy-chained symlinks. +while + APP_HOME=${app_path%"${app_path##*/}"} # leaves a trailing /; empty if no leading path + [ -h "$app_path" ] +do + ls=$( ls -ld "$app_path" ) + link=${ls#*' -> '} + case $link in #( + /*) app_path=$link ;; #( + *) app_path=$APP_HOME$link ;; + esac +done + +# This is normally unused +# shellcheck disable=SC2034 +APP_BASE_NAME=${0##*/} +# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036) +APP_HOME=$( cd -P "${APP_HOME:-./}" > /dev/null && printf '%s +' "$PWD" ) || exit + +# Use the maximum available, or set MAX_FD != -1 to use that value. +MAX_FD=maximum + +warn () { + echo "$*" +} >&2 + +die () { + echo + echo "$*" + echo + exit 1 +} >&2 + +# OS specific support (must be 'true' or 'false'). +cygwin=false +msys=false +darwin=false +nonstop=false +case "$( uname )" in #( + CYGWIN* ) cygwin=true ;; #( + Darwin* ) darwin=true ;; #( + MSYS* | MINGW* ) msys=true ;; #( + NONSTOP* ) nonstop=true ;; +esac + +CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar + + +# Determine the Java command to use to start the JVM. +if [ -n "$JAVA_HOME" ] ; then + if [ -x "$JAVA_HOME/jre/sh/java" ] ; then + # IBM's JDK on AIX uses strange locations for the executables + JAVACMD=$JAVA_HOME/jre/sh/java + else + JAVACMD=$JAVA_HOME/bin/java + fi + if [ ! -x "$JAVACMD" ] ; then + die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +else + JAVACMD=java + if ! command -v java >/dev/null 2>&1 + then + die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. + +Please set the JAVA_HOME variable in your environment to match the +location of your Java installation." + fi +fi + +# Increase the maximum file descriptors if we can. +if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then + case $MAX_FD in #( + max*) + # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + MAX_FD=$( ulimit -H -n ) || + warn "Could not query maximum file descriptor limit" + esac + case $MAX_FD in #( + '' | soft) :;; #( + *) + # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked. + # shellcheck disable=SC2039,SC3045 + ulimit -n "$MAX_FD" || + warn "Could not set maximum file descriptor limit to $MAX_FD" + esac +fi + +# Collect all arguments for the java command, stacking in reverse order: +# * args from the command line +# * the main class name +# * -classpath +# * -D...appname settings +# * --module-path (only if needed) +# * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables. + +# For Cygwin or MSYS, switch paths to Windows format before running java +if "$cygwin" || "$msys" ; then + APP_HOME=$( cygpath --path --mixed "$APP_HOME" ) + CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" ) + + JAVACMD=$( cygpath --unix "$JAVACMD" ) + + # Now convert the arguments - kludge to limit ourselves to /bin/sh + for arg do + if + case $arg in #( + -*) false ;; # don't mess with options #( + /?*) t=${arg#/} t=/${t%%/*} # looks like a POSIX filepath + [ -e "$t" ] ;; #( + *) false ;; + esac + then + arg=$( cygpath --path --ignore --mixed "$arg" ) + fi + # Roll the args list around exactly as many times as the number of + # args, so each arg winds up back in the position where it started, but + # possibly modified. + # + # NB: a `for` loop captures its iteration list before it begins, so + # changing the positional parameters here affects neither the number of + # iterations, nor the values presented in `arg`. + shift # remove old arg + set -- "$@" "$arg" # push replacement arg + done +fi + + +# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"' + +# Collect all arguments for the java command: +# * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments, +# and any embedded shellness will be escaped. +# * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be +# treated as '${Hostname}' itself on the command line. + +set -- \ + "-Dorg.gradle.appname=$APP_BASE_NAME" \ + -classpath "$CLASSPATH" \ + org.gradle.wrapper.GradleWrapperMain \ + "$@" + +# Stop when "xargs" is not available. +if ! command -v xargs >/dev/null 2>&1 +then + die "xargs is not available" +fi + +# Use "xargs" to parse quoted args. +# +# With -n1 it outputs one arg per line, with the quotes and backslashes removed. +# +# In Bash we could simply go: +# +# readarray ARGS < <( xargs -n1 <<<"$var" ) && +# set -- "${ARGS[@]}" "$@" +# +# but POSIX shell has neither arrays nor command substitution, so instead we +# post-process each arg (as a line of input to sed) to backslash-escape any +# character that might be a shell metacharacter, then use eval to reverse +# that process (while maintaining the separation between arguments), and wrap +# the whole thing up as a single "set" statement. +# +# This will of course break if any of these variables contains a newline or +# an unmatched quote. +# + +eval "set -- $( + printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" | + xargs -n1 | + sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' | + tr '\n' ' ' + )" '"$@"' + +exec "$JAVACMD" "$@" diff --git a/2025/01/cracking_code_interview_16_20_t9/gradlew.bat b/2025/01/cracking_code_interview_16_20_t9/gradlew.bat new file mode 100644 index 0000000..9d21a21 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/gradlew.bat @@ -0,0 +1,94 @@ +@rem +@rem Copyright 2015 the original author or authors. +@rem +@rem Licensed under the Apache License, Version 2.0 (the "License"); +@rem you may not use this file except in compliance with the License. +@rem You may obtain a copy of the License at +@rem +@rem https://www.apache.org/licenses/LICENSE-2.0 +@rem +@rem Unless required by applicable law or agreed to in writing, software +@rem distributed under the License is distributed on an "AS IS" BASIS, +@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +@rem See the License for the specific language governing permissions and +@rem limitations under the License. +@rem +@rem SPDX-License-Identifier: Apache-2.0 +@rem + +@if "%DEBUG%"=="" @echo off +@rem ########################################################################## +@rem +@rem Gradle startup script for Windows +@rem +@rem ########################################################################## + +@rem Set local scope for the variables with windows NT shell +if "%OS%"=="Windows_NT" setlocal + +set DIRNAME=%~dp0 +if "%DIRNAME%"=="" set DIRNAME=. +@rem This is normally unused +set APP_BASE_NAME=%~n0 +set APP_HOME=%DIRNAME% + +@rem Resolve any "." and ".." in APP_HOME to make it shorter. +for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi + +@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script. +set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m" + +@rem Find java.exe +if defined JAVA_HOME goto findJavaFromJavaHome + +set JAVA_EXE=java.exe +%JAVA_EXE% -version >NUL 2>&1 +if %ERRORLEVEL% equ 0 goto execute + +echo. 1>&2 +echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH. 1>&2 +echo. 1>&2 +echo Please set the JAVA_HOME variable in your environment to match the 1>&2 +echo location of your Java installation. 1>&2 + +goto fail + +:findJavaFromJavaHome +set JAVA_HOME=%JAVA_HOME:"=% +set JAVA_EXE=%JAVA_HOME%/bin/java.exe + +if exist "%JAVA_EXE%" goto execute + +echo. 1>&2 +echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME% 1>&2 +echo. 1>&2 +echo Please set the JAVA_HOME variable in your environment to match the 1>&2 +echo location of your Java installation. 1>&2 + +goto fail + +:execute +@rem Setup the command line + +set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar + + +@rem Execute Gradle +"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %* + +:end +@rem End local scope for the variables with windows NT shell +if %ERRORLEVEL% equ 0 goto mainEnd + +:fail +rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of +rem the _cmd.exe /c_ return code! +set EXIT_CODE=%ERRORLEVEL% +if %EXIT_CODE% equ 0 set EXIT_CODE=1 +if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE% +exit /b %EXIT_CODE% + +:mainEnd +if "%OS%"=="Windows_NT" endlocal + +:omega diff --git a/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/Program.java b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/Program.java new file mode 100644 index 0000000..6bdcfea --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/Program.java @@ -0,0 +1,27 @@ +package pl.polgrabia.demos.crackingcodeinterview.t16x20; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.nio.file.Paths; + +public class Program { + private static final Logger logger = LoggerFactory.getLogger(Program.class); + public static void main(String[] args) { + if (args.length != 1) { + logger.error("Usage: java Program "); + System.exit(1); + return; + } + + var wordDictionaryPath = args[0]; + var rstTree = new RstTreeLoader(Paths.get(wordDictionaryPath)).load(); + // test for rst tree + // String w = "abadia"; // exists + // String w = "asdadsadadlosdaladsad"; // doesn't exists + // String w = "abcdefg"; // doesn't exists + // logger.info("Looking for word: {} - {}", w, rstTree.contains(w)); + + } + +} diff --git a/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTree.java b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTree.java new file mode 100644 index 0000000..3d67b67 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTree.java @@ -0,0 +1,90 @@ +package pl.polgrabia.demos.crackingcodeinterview.t16x20; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.util.ArrayList; + +public class RstTree { + private static final Logger logger = LoggerFactory.getLogger(RstTree.class); + private static final Logger log = LoggerFactory.getLogger(RstTree.class); + private RstTreeNode rstTreeNode; + + public void add(String word) { + assert word != null : "word must not be null"; + assert !word.isBlank() : "word must not be blank"; + assert word.matches("^[a-z]+$") : "word '" + word + "' must contain only small letters"; + if (rstTreeNode == null) { + rstTreeNode = new RstTreeNode(); + rstTreeNode.setPrefix(""); + rstTreeNode.setValue(word); + } else { + addInternal(rstTreeNode, word); + } + } + + private static boolean addInternal(RstTreeNode node, String word) { + if (word.equals(node.getValue())) { + // already added + return false; + } + + assert word.startsWith(node.getPrefix()) : "word must start with prefix"; + int prefixLength = node.getPrefix().length(); + if (prefixLength >= word.length()) { + String oldValue = node.getValue(); + node.setValue(word); + boolean added = addInternal(node, oldValue); + if (!added) { + node.setValue(oldValue); + return false; + } + + return true; + } + char c = word.charAt(prefixLength); + int offset = c - 'a'; + assert offset >= 0 && offset < RstTreeNode.EN_ALPHABET_LETTER_COUNT : "It's an offset for possible prefix child item - max alphabet"; + // logger.info("Word: {}, prefix: {}, index: {}, c: {}, offset: {}", word, node.getPrefix(), node.getPrefix().length(), c, offset); + var childItem = node.getRstChildren().length <= offset ? null : node.getRstChildren()[offset]; + if (childItem == null) { + childItem = new RstTreeNode(); + childItem.setPrefix(word.substring(0, prefixLength + 1)); + childItem.setValue(word); + node.getRstChildren()[offset] = childItem; + return true; + } else { + return addInternal(childItem, word); + } + } + + public boolean contains(String word) { + assert word != null : "word must not be null"; + assert !word.isBlank() : "word must not be blank"; + assert word.matches("^[a-z]+$") : "word '" + word + "' must contain only small letters"; + + return containsInternal(rstTreeNode, word); + } + + private boolean containsInternal(RstTreeNode node, String word) { + if (node == null) { + return false; + } + + logger.info("Node value: {}, prefix: {}, word: {}", node.getValue(), node.getPrefix(), word); + + assert word.startsWith(node.getPrefix()) : "word " + word + "must start with prefix: " + node.getPrefix(); + + if (word.equals(node.getValue())) { + return true; + } + + char c = word.charAt(node.getPrefix().length()); + int offset = c - 'a'; + assert offset >= 0 && offset < RstTreeNode.EN_ALPHABET_LETTER_COUNT : "It's an offset for possible prefix child item - max alphabet"; + // logger.info("Word: {}, prefix: {}, index: {}, c: {}, offset: {}", word, node.getPrefix(), node.getPrefix().length(), c, offset); + var childItem = node.getRstChildren().length <= offset ? null : node.getRstChildren()[offset]; + logger.info("Childitem: {}, c: {}, offset: {}", childItem, c, offset); + return containsInternal(childItem, word); + } +} diff --git a/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeLoader.java b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeLoader.java new file mode 100644 index 0000000..56dbef3 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeLoader.java @@ -0,0 +1,53 @@ +package pl.polgrabia.demos.crackingcodeinterview.t16x20; + +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.BufferedReader; +import java.io.FileInputStream; +import java.io.IOException; +import java.io.InputStreamReader; +import java.nio.file.Path; +import java.util.Locale; + +public class RstTreeLoader { + private static final Logger logger = LoggerFactory.getLogger(RstTreeLoader.class); + private final Path path; + private RstTreeNode rstTree; + private int counterBad = 0; + private int counterProcessed = 0; + + public RstTreeLoader(Path path) { + this.path = path; + } + + public RstTree load() { + var rstTree = new RstTree(); + try (BufferedReader br = new BufferedReader( + new InputStreamReader( + new FileInputStream(path.toFile())))) { + String line; + while ((line = br.readLine()) != null) { + processLine(rstTree, line); + } + logger.info("Processed {} lines, bad ones: {}", counterProcessed, counterBad); + return rstTree; + } catch (IOException e) { + throw new IllegalStateException( + "Unable to load word dictionary from path: " + + path, e); + } + } + + private void processLine(RstTree rstTree, String line) { + String lowerCasedLine = line.trim() + .toLowerCase(Locale.ENGLISH); + if (!lowerCasedLine + .matches("^[a-z]+$")) { + counterBad++; + } else { + rstTree.add(lowerCasedLine); + } + counterProcessed++; + } +} diff --git a/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeNode.java b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeNode.java new file mode 100644 index 0000000..ece3e27 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/src/main/java/pl/polgrabia/demos/crackingcodeinterview/t16x20/RstTreeNode.java @@ -0,0 +1,46 @@ +package pl.polgrabia.demos.crackingcodeinterview.t16x20; + +import java.util.ArrayList; +import java.util.List; + +public class RstTreeNode { + public static final int EN_ALPHABET_LETTER_COUNT = 26; + private String prefix; + private String value; + private RstTreeNode[] rstChildren; + + RstTreeNode() { + rstChildren = new RstTreeNode[EN_ALPHABET_LETTER_COUNT]; + } + + public String getPrefix() { + return prefix; + } + + public void setPrefix(String prefix) { + this.prefix = prefix; + } + + public String getValue() { + return value; + } + + public void setValue(String value) { + this.value = value; + } + + public RstTreeNode[] getRstChildren() { + return rstChildren; + } + + public void setRstChildren(RstTreeNode[] rstChildren) { + this.rstChildren = rstChildren; + } + + @Override + public String toString() { + return "RSTTreeNode{" + + "value='" + value + '\'' + + '}'; + } +} diff --git a/2025/01/cracking_code_interview_16_20_t9/src/main/resources/logback.xml b/2025/01/cracking_code_interview_16_20_t9/src/main/resources/logback.xml new file mode 100644 index 0000000..83776c8 --- /dev/null +++ b/2025/01/cracking_code_interview_16_20_t9/src/main/resources/logback.xml @@ -0,0 +1,13 @@ + + + + + + %d{HH:mm::ss.SSS[Z]} %level %logger{36} %msg%n + + + + + + + \ No newline at end of file