feat: add question #09

Author: hi-dhl

.gitignore

@@ -0,0 +1,274 @@
+# Windows:
+Thumbs.db
+ehthumbs.db
+Desktop.ini
+
+# Python:
+*.py[cod]
+*.so
+*.egg
+*.egg-info
+dist
+build
+migrations
+
+#Django
+*.egg-info
+*.pot
+*.py[co]
+.tox/
+__pycache__
+MANIFEST
+dist/
+docs/_build/
+docs/locale/
+node_modules/
+tests/coverage_html/
+tests/.coverage
+build/
+tests/report/
+
+#--------------------------------
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+env/
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+*.egg-info/
+.installed.cfg
+*.egg
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*,cover
+.hypothesis/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# IPython Notebook
+.ipynb_checkpoints
+
+# pyenv
+.python-version
+
+# celery beat schedule file
+celerybeat-schedule
+
+# dotenv
+.env
+
+# virtualenv
+venv/
+ENV/
+
+# Spyder project settings
+.spyderproject
+
+# Rope project settings
+.ropeproject
+
+database/
+media/
+whoosh_index/
+.idea/
+*.sqlite3
+fabfile.py
+
+
+
+#--------------------------------
+
+
+#java
+*.class
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+
+# My configurations:
+db.ini
+deploy_key_rsa
+
+# Package Files #
+*.jar
+*.war
+*.ear
+
+#phpstorm
+*.idea
+
+#过滤数据库文件、sln解决方案文件、配置文件  
+*.mdb  
+*.ldb  
+*.sln  
+*.config  
+
+#other
+data/error/
+.idea*/
+.idea/
+*.htm
+
+# 忽略名称中末尾为ignore的文件夹
+*ignore/
+*ignore*/
+
+
+
+
+# Logs
+logs
+*.log
+npm-debug.log*
+# Runtime data
+pids
+*.pid
+*.seed
+*.pid.lock
+# Directory for instrumented libs generated by jscoverage/JSCover
+lib-cov
+# Coverage directory used by tools like istanbul
+coverage
+# nyc test coverage
+.nyc_output
+# Grunt intermediate storage (http://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+# Bower dependency directory (https://bower.io/)
+bower_components
+# node-waf configuration
+.lock-wscript
+# Compiled binary addons (http://nodejs.org/api/addons.html)
+build/Release
+# Dependency directories
+node_modules/
+jspm_packages/
+# Typescript v1 declaration files
+typings/
+# Optional npm cache directory
+.npm
+# Optional eslint cache
+.eslintcache
+# Optional REPL history
+.node_repl_history
+# Output of 'npm pack'
+*.tgz
+# Yarn Integrity file
+.yarn-integrity
+# dotenv environment variables file
+.env
+.vscode
+# ignore sh
+sh/
+# ignore test sdk.config.json
+sdk.config.json
+# ignore local config
+server/config.local.js
+
+
+#-------android
+# Built application files
+#*.apk
+*.ap_
+
+# Files for the ART/Dalvik VM
+*.dex
+
+# Java class files
+*.class
+
+# Generated files
+bin/
+gen/
+out/
+
+# Gradle files
+.gradle/
+build/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Proguard folder generated by Eclipse
+proguard/
+
+# Log Files
+*.log
+
+# Android Studio Navigation editor temp files
+.navigation/
+
+# Android Studio captures folder
+captures/
+
+# Intellij
+*.iml
+.idea/
+
+# Keystore files
+*.jks
+
+# External native build folder generated in Android Studio 2.2 and later
+.externalNativeBuild
+
+# DS_Store files
+*.DS_Store
+
+.MWebMetaData/
+gradle.properties

CMakeLists.txt

@@ -0,0 +1,6 @@
+cmake_minimum_required(VERSION 3.19)
+project(Leetcode_Solution_C_C__)
+
+set(CMAKE_CXX_STANDARD 14)
+
+add_executable(Leetcode_Solution_C_C__ main.cpp code/_19/Solution.cpp code/common/ListNode.h)