diff --git a/.amazonq/rules/development-rules.md b/.amazonq/rules/development-rules.md
new file mode 100644
index 0000000..6e4b968
--- /dev/null
+++ b/.amazonq/rules/development-rules.md
@@ -0,0 +1,46 @@
+# LeetCode Repository Rules
+
+## Discussion Mode
+
+- **Discussion Mode**: Prefix prompt with "D:" to enter read-only discussion mode
+- In discussion mode: NO code updates, only read files and provide analysis/suggestions
+- Always start responses with "[Discussion Mode]" header when in discussion mode
+- Never exit discussion mode automatically - only when user uses "XD:" prefix
+- If user seems to want code changes, remind them to use "XD:" to exit discussion mode
+- **Exit Discussion**: Use "XD:" prefix to exit discussion mode and resume normal operations
+
+## Code Standards
+
+- Use snake_case for Python method names (following Python convention)
+- Always include type hints for function parameters and return types
+- Add return statements to satisfy type checkers even if unreachable
+- Follow the project's linting rules (black, isort, ruff, mypy)
+
+## Template Usage
+
+- **When user copies LeetCode problem**: Use `leetcode/_template/` to structure the question
+- Copy template files to new question directory: `leetcode/{question_name}/`
+- Replace template placeholders with actual problem details:
+    - `{method_name}` - snake_case method name (e.g., `two_sum`)
+    - `{ClassName}` - PascalCase class name (e.g., `TwoSum`)
+    - `{parameters}` - method parameters with types
+    - `{return_type}` - return type annotation
+    - Test case placeholders with actual examples
+- Always use the template structure for consistency
+
+## File Structure
+
+Each LeetCode problem should have:
+
+- `README.md` - Problem description and examples
+- `solution.py` - Solution implementation
+- `tests.py` - Parametrized pytest tests with loguru logging
+- `__init__.py` - Empty file for Python package
+
+## Testing
+
+- Use `make test-question QUESTION=<question_name>` to run tests
+- Use `make test` to run all questions with coverage
+- Default question is set to `two_sum` in Makefile
+- Tests should cover all provided examples
+- Use loguru for beautiful logging in tests
diff --git a/.github/renovate.json5 b/.github/renovate.json5
new file mode 100644
index 0000000..37c5b78
--- /dev/null
+++ b/.github/renovate.json5
@@ -0,0 +1,4 @@
+{
+    $schema: "https://docs.renovatebot.com/renovate-schema.json",
+    extends: ["config:recommended"],
+}
diff --git a/.github/workflows/cd.yml b/.github/workflows/cd.yml
new file mode 100644
index 0000000..a95a7a9
--- /dev/null
+++ b/.github/workflows/cd.yml
@@ -0,0 +1,57 @@
+name: cd
+
+on:
+    push:
+        branches:
+            - main
+
+permissions:
+    contents: write
+    issues: write
+    pull-requests: write
+
+jobs:
+    versioning:
+        name: versioning
+        runs-on: ubuntu-latest
+        outputs:
+            new_release_version: ${{ steps.set-outputs.outputs.version }}
+            new_release_published: ${{ steps.set-outputs.outputs.published }}
+        steps:
+            - name: Checkout
+              uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+              with:
+                  fetch-depth: 0
+
+            - name: Check existing release
+              id: check-release
+              run: |
+                  CURRENT_SHA=$(git rev-parse HEAD)
+                  EXISTING_TAG=$(git tag --points-at $CURRENT_SHA | grep '^v' | head -1)
+                  if [ -n "$EXISTING_TAG" ]; then
+                      echo "existing_tag=$EXISTING_TAG" >> $GITHUB_OUTPUT
+                      echo "existing_version=${EXISTING_TAG#v}" >> $GITHUB_OUTPUT
+                      echo "has_existing=true" >> $GITHUB_OUTPUT
+                  else
+                      echo "has_existing=false" >> $GITHUB_OUTPUT
+                  fi
+
+            - id: release
+              name: Release
+              if: steps.check-release.outputs.has_existing == 'false'
+              uses: cycjimmy/semantic-release-action@16ca923e6ccbb50770c415a0ccd43709a8c5f7a4 # v4.2.2
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+            - name: Set outputs
+              id: set-outputs
+              run: |
+                  if [ "${{ steps.check-release.outputs.has_existing }}" == "true" ]; then
+                      echo "version=${{ steps.check-release.outputs.existing_version }}" >> $GITHUB_OUTPUT
+                      echo "published=true" >> $GITHUB_OUTPUT
+                      echo "Using existing release: ${{ steps.check-release.outputs.existing_version }}"
+                  else
+                      echo "version=${{ steps.release.outputs.new_release_version }}" >> $GITHUB_OUTPUT
+                      echo "published=${{ steps.release.outputs.new_release_published }}" >> $GITHUB_OUTPUT
+                      echo "New release: ${{ steps.release.outputs.new_release_version }}"
+                  fi
diff --git a/.github/workflows/ci-pre-commit.yml b/.github/workflows/ci-pre-commit.yml
new file mode 100644
index 0000000..4b82c93
--- /dev/null
+++ b/.github/workflows/ci-pre-commit.yml
@@ -0,0 +1,44 @@
+name: ci
+
+on:
+    pull_request:
+        types: [opened, synchronize, reopened]
+
+jobs:
+    pre-commit:
+        runs-on: ubuntu-latest
+        steps:
+            - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+            - uses: actions/setup-python@a26af69be951a213d495a4c3e4e4022e16d87065 # v5.6.0
+              with:
+                  python-version: "3.x"
+
+            - name: Install Poetry
+              uses: snok/install-poetry@76e04a911780d5b312d89783f7b1cd627778900a # v1.4.1
+              with:
+                  virtualenvs-create: true
+                  virtualenvs-in-project: true
+                  installer-parallel: true
+
+            - name: Load cached venv
+              id: cached-poetry-dependencies
+              uses: actions/cache@0400d5f644dc74513175e3cd8d07132dd4860809 # v4.2.4
+              with:
+                  path: .venv
+                  key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+            - name: Install dependencies
+              run: poetry install --no-interaction --no-ansi
+
+            - name: Setup Node.js
+              uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
+              with:
+                  node-version: "latest"
+
+            - name: Install Prettier
+              run: npm install -g prettier
+
+            - uses: pre-commit/action@2c7b3805fd2a0fd8c1884dcaebf91fc102a13ecd # v3.0.1
+              with:
+                  extra_args: --all-files
diff --git a/.github/workflows/ci-test.yml b/.github/workflows/ci-test.yml
new file mode 100644
index 0000000..c661d13
--- /dev/null
+++ b/.github/workflows/ci-test.yml
@@ -0,0 +1,40 @@
+name: ci
+
+on:
+    push:
+        branches: [main]
+    pull_request:
+        branches: [main]
+
+jobs:
+    test:
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@v4
+
+            - name: Set up Python
+              uses: actions/setup-python@v5
+              with:
+                  python-version: "3.13"
+
+            - name: Install Poetry
+              uses: snok/install-poetry@v1
+              with:
+                  virtualenvs-create: true
+                  virtualenvs-in-project: true
+                  installer-parallel: true
+
+            - name: Load cached venv
+              id: cached-poetry-dependencies
+              uses: actions/cache@v4
+              with:
+                  path: .venv
+                  key: venv-${{ runner.os }}-${{ steps.setup-python.outputs.python-version }}-${{ hashFiles('**/poetry.lock') }}
+
+            - name: Install dependencies
+              if: steps.cached-poetry-dependencies.outputs.cache-hit != 'true'
+              run: poetry install --no-interaction --no-ansi
+
+            - name: Run tests
+              run: make test
diff --git a/.github/workflows/security.yml b/.github/workflows/security.yml
new file mode 100644
index 0000000..8a68b43
--- /dev/null
+++ b/.github/workflows/security.yml
@@ -0,0 +1,35 @@
+name: security
+on:
+    push:
+    workflow_dispatch:
+    schedule:
+        - cron: "0 4 * * *" # run once a day at 4 AM
+
+jobs:
+    trivy-scan:
+        runs-on: ubuntu-latest
+
+        steps:
+            - name: Checkout repository
+              uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+
+            - name: Run Trivy dependency scan
+              uses: aquasecurity/trivy-action@dc5a429b52fcf669ce959baa2c2dd26090d2a6c4 # v0.32.0
+              with:
+                  scan-type: fs
+                  format: table
+                  exit-code: "1"
+                  vuln-type: "os,library"
+
+    gitleaks:
+        name: gitleaks
+        runs-on: ubuntu-latest
+
+        steps:
+            - uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+              with:
+                  fetch-depth: 0
+
+            - uses: gitleaks/gitleaks-action@ff98106e4c7b2bc287b24eaf42907196329070c7 # v2.3.9
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.github/workflows/semantic-pull-request.yaml b/.github/workflows/semantic-pull-request.yaml
new file mode 100644
index 0000000..9bdf0dd
--- /dev/null
+++ b/.github/workflows/semantic-pull-request.yaml
@@ -0,0 +1,19 @@
+name: ci
+
+on:
+    pull_request:
+        branches: [main]
+        types: [opened, edited, synchronize, reopened]
+
+permissions:
+    pull-requests: read
+
+jobs:
+    semantic-pull-request:
+        name: semantic-pull-request
+        runs-on: ubuntu-latest
+        steps:
+            - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
+              name: Validate PR title
+              env:
+                  GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..484c224
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,575 @@
+# Created by https://www.toptal.com/developers/gitignore/api/macos,windows,visualstudiocode,intellij+all,node,java,python,go,ssh,terragrunt,terraform
+# Edit at https://www.toptal.com/developers/gitignore?templates=macos,windows,visualstudiocode,intellij+all,node,java,python,go,ssh,terragrunt,terraform
+
+### Go ###
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij+all Patch ###
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
+
+.idea/*
+
+!.idea/codeStyles
+!.idea/runConfigurations
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+
+### macOS ###
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### Node ###
+# Logs
+logs
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+lerna-debug.log*
+.pnpm-debug.log*
+
+# Diagnostic reports (https://nodejs.org/api/report.html)
+report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json
+
+# 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
+*.lcov
+
+# nyc test coverage
+.nyc_output
+
+# Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files)
+.grunt
+
+# Bower dependency directory (https://bower.io/)
+bower_components
+
+# node-waf configuration
+.lock-wscript
+
+# Compiled binary addons (https://nodejs.org/api/addons.html)
+build/Release
+
+# Dependency directories
+node_modules/
+jspm_packages/
+
+# Snowpack dependency directory (https://snowpack.dev/)
+web_modules/
+
+# TypeScript cache
+*.tsbuildinfo
+
+# Optional npm cache directory
+.npm
+
+# Optional eslint cache
+.eslintcache
+
+# Optional stylelint cache
+.stylelintcache
+
+# Microbundle cache
+.rpt2_cache/
+.rts2_cache_cjs/
+.rts2_cache_es/
+.rts2_cache_umd/
+
+# Optional REPL history
+.node_repl_history
+
+# Output of 'npm pack'
+*.tgz
+
+# Yarn Integrity file
+.yarn-integrity
+
+# dotenv environment variable files
+.env
+.env.development.local
+.env.test.local
+.env.production.local
+.env.local
+
+# parcel-bundler cache (https://parceljs.org/)
+.cache
+.parcel-cache
+
+# Next.js build output
+.next
+out
+
+# Nuxt.js build / generate output
+.nuxt
+dist
+
+# Gatsby files
+.cache/
+# Comment in the public line in if your project uses Gatsby and not Next.js
+# https://nextjs.org/blog/next-9-1#public-directory-support
+# public
+
+# vuepress build output
+.vuepress/dist
+
+# vuepress v2.x temp and cache directory
+.temp
+
+# Docusaurus cache and generated files
+.docusaurus
+
+# Serverless directories
+.serverless/
+
+# FuseBox cache
+.fusebox/
+
+# DynamoDB Local files
+.dynamodb/
+
+# TernJS port file
+.tern-port
+
+# Stores VSCode versions used for testing VSCode extensions
+.vscode-test
+
+# yarn v2
+.yarn/cache
+.yarn/unplugged
+.yarn/build-state.yml
+.yarn/install-state.gz
+.pnp.*
+
+### Node Patch ###
+# Serverless Webpack directories
+.webpack/
+
+# Optional stylelint cache
+
+# SvelteKit build / generate output
+.svelte-kit
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# 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/
+.nox/
+.coverage
+.coverage.*
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
+### SSH ###
+**/.ssh/id_*
+**/.ssh/*_id_*
+**/.ssh/known_hosts
+
+### Terraform ###
+# Local .terraform directories
+**/.terraform/*
+
+# .tfstate files
+*.tfstate
+*.tfstate.*
+
+# Crash log files
+crash.log
+crash.*.log
+
+# Exclude all .tfvars files, which are likely to contain sensitive data, such as
+# password, private keys, and other secrets. These should not be part of version
+# control as they are data points which are potentially sensitive and subject
+# to change depending on the environment.
+*.tfvars
+*.tfvars.json
+
+# Ignore override files as they are usually used to override resources locally and so
+# are not checked in
+override.tf
+override.tf.json
+*_override.tf
+*_override.tf.json
+
+# Include override files you do wish to add to version control using negated pattern
+# !example_override.tf
+
+# Include tfplan files to ignore the plan output of command: terraform plan -out=tfplan
+# example: *tfplan*
+
+# Ignore CLI configuration files
+.terraformrc
+terraform.rc
+
+### Terragrunt ###
+# terragrunt cache directories
+**/.terragrunt-cache/*
+
+# Terragrunt debug output file (when using `--terragrunt-debug` option)
+# See: https://terragrunt.gruntwork.io/docs/reference/cli-options/#terragrunt-debug
+terragrunt-debug.tfvars.json
+
+### VisualStudioCode ###
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+!.vscode/*.code-snippets
+
+# Local History for Visual Studio Code
+.history/
+
+# Built Visual Studio Code Extensions
+*.vsix
+
+### VisualStudioCode Patch ###
+# Ignore all local history of files
+.history
+.ionide
+
+### Windows ###
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+# End of https://www.toptal.com/developers/gitignore/api/macos,windows,visualstudiocode,intellij+all,node,java,python,go,ssh,terragrunt,terraform
diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..e1ced82
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "scripts/shared"]
+	path = scripts/shared
+	url = https://github.com/wisarootl/shared-scripts.git
+	branch = main
diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
new file mode 100644
index 0000000..5123e0d
--- /dev/null
+++ b/.pre-commit-config.yaml
@@ -0,0 +1,29 @@
+repos:
+    - repo: local
+      hooks:
+          - id: update-pre-commit-hooks
+            name: update pre-commit hooks
+            entry: pre-commit autoupdate
+            language: system
+            pass_filenames: false
+            types: [file]
+    - repo: https://github.com/pre-commit/pre-commit-hooks
+      rev: v6.0.0
+      hooks:
+          - id: trailing-whitespace
+          - id: end-of-file-fixer
+          - id: check-yaml
+          - id: check-added-large-files
+            args: ["--maxkb=20000"]
+    - repo: https://github.com/gitleaks/gitleaks
+      rev: v8.28.0
+      hooks:
+          - name: gitleaks
+            id: gitleaks
+    - repo: local
+      hooks:
+          - id: lint
+            name: lint
+            entry: make lint
+            language: system
+            pass_filenames: false
diff --git a/.prettierrc.json b/.prettierrc.json
new file mode 100644
index 0000000..a33508c
--- /dev/null
+++ b/.prettierrc.json
@@ -0,0 +1,6 @@
+{
+    "semi": false,
+    "tabWidth": 4,
+    "trailingComma": "es5",
+    "printWidth": 105
+}
diff --git a/.releaserc.js b/.releaserc.js
new file mode 100644
index 0000000..300a89d
--- /dev/null
+++ b/.releaserc.js
@@ -0,0 +1,25 @@
+module.exports = {
+    branches: ["main"],
+    plugins: [
+        [
+            "@semantic-release/commit-analyzer",
+            {
+                preset: "angular",
+                releaseRules: [
+                    { type: "feat", release: "minor" },
+                    { type: "fix", release: "patch" },
+                    { type: "chore", release: "patch" },
+                    { type: "docs", release: "patch" },
+                    { type: "style", release: "patch" },
+                    { type: "refactor", release: "patch" },
+                    { type: "perf", release: "patch" },
+                    { type: "test", release: "patch" },
+                    { type: "build", release: "patch" },
+                    { type: "ci", release: "patch" },
+                ],
+            },
+        ],
+        "@semantic-release/release-notes-generator",
+        "@semantic-release/github",
+    ],
+}
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..7707f9c
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,44 @@
+PYTHON_VERSION = 3.13
+QUESTION ?= two_sum
+
+sync_submodules:
+	git submodule update --init --recursive --remote
+
+setup_dev: sync_submodules
+	chmod +x scripts/shared/python/poetry/setup_dev.sh
+	./scripts/shared/python/poetry/setup_dev.sh \
+		--python-version $(PYTHON_VERSION) \
+		--colima-docker
+	exec /usr/bin/env zsh
+
+assert_setup_dev:
+	chmod +x scripts/shared/python/poetry/assert_setup_dev.sh
+	./scripts/shared/python/poetry/assert_setup_dev.sh
+
+lint:
+	poetry sort
+	poetry run black .
+	poetry run isort .
+	poetry run ruff check .
+	poetry run mypy \
+		--explicit-package-bases \
+		--install-types \
+		--non-interactive \
+		--check-untyped-defs .
+	npx prettier --write "**/*.{ts,tsx,css,json,yaml,yml,md}"
+
+
+test:
+	poetry run pytest leetcode/ \
+		-v --cov=leetcode --cov=leetcode_py \
+		--cov-report=term-missing \
+		--ignore=leetcode/_template \
+		--ignore=leetcode/__pycache__
+
+test-question:
+	@echo "Testing question: $(QUESTION)"
+	@if [ ! -d "leetcode/$(QUESTION)" ]; then \
+		echo "Error: Question '$(QUESTION)' not found in leetcode/ directory"; \
+		exit 1; \
+	fi
+	cd leetcode/$(QUESTION) && poetry run pytest tests.py -v -s
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
diff --git a/leetcode/__init__.py b/leetcode/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/leetcode/_template/README.md b/leetcode/_template/README.md
new file mode 100644
index 0000000..575d329
--- /dev/null
+++ b/leetcode/_template/README.md
@@ -0,0 +1,51 @@
+# {PROBLEM_NUMBER}. {PROBLEM_TITLE}
+
+**Difficulty:** {DIFFICULTY}
+**Topics:** {TOPICS}
+
+## Problem Description
+
+{PROBLEM_DESCRIPTION}
+
+## Examples
+
+### Example 1:
+
+```
+Input: {INPUT_1}
+Output: {OUTPUT_1}
+Explanation: {EXPLANATION_1}
+```
+
+### Example 2:
+
+```
+Input: {INPUT_2}
+Output: {OUTPUT_2}
+```
+
+### Example 3:
+
+```
+Input: {INPUT_3}
+Output: {OUTPUT_3}
+```
+
+## Constraints
+
+{CONSTRAINTS}
+
+## Follow-up
+
+{FOLLOW_UP}
+
+## Solution
+
+```python
+def {method_name}({parameters}):
+    # TODO: Implement solution
+    pass
+```
+
+**Time Complexity:** O(?)
+**Space Complexity:** O(?)
diff --git a/leetcode/_template/solution.py b/leetcode/_template/solution.py
new file mode 100644
index 0000000..f6d6aaa
--- /dev/null
+++ b/leetcode/_template/solution.py
@@ -0,0 +1,7 @@
+from typing import List
+
+
+class Solution:
+    def {method_name}(self, {parameters}) -> {return_type}:
+        # TODO: Implement solution
+        pass
diff --git a/leetcode/_template/tests.py b/leetcode/_template/tests.py
new file mode 100644
index 0000000..6ecfea2
--- /dev/null
+++ b/leetcode/_template/tests.py
@@ -0,0 +1,23 @@
+import pytest
+from loguru import logger
+from .solution import Solution
+
+
+class Test{ClassName}:
+    def setup_method(self):
+        self.solution = Solution()
+
+    @pytest.mark.parametrize(
+        "{param_names}",
+        [
+            ({test_case_1}),
+            ({test_case_2}),
+            ({test_case_3}),
+        ],
+    )
+    def test_{method_name}(self, {param_names}):
+        logger.info(f"Testing with {input_description}")
+        result = self.solution.{method_name}({input_params})
+        logger.success(f"Got result: {result}")
+        assert result == {expected_param}
+        logger.debug("Test passed! ✨")
diff --git a/leetcode/two_sum/README.md b/leetcode/two_sum/README.md
new file mode 100644
index 0000000..1995e32
--- /dev/null
+++ b/leetcode/two_sum/README.md
@@ -0,0 +1,62 @@
+# Two Sum
+
+**Difficulty:** Easy
+**Topics:** Array, Hash Table
+
+## Problem Description
+
+Given an array of integers `nums` and an integer `target`, return indices of the two numbers such that they add up to target.
+
+You may assume that each input would have exactly one solution, and you may not use the same element twice.
+
+You can return the answer in any order.
+
+## Examples
+
+### Example 1:
+
+```
+Input: nums = [2,7,11,15], target = 9
+Output: [0,1]
+Explanation: Because nums[0] + nums[1] == 9, we return [0, 1].
+```
+
+### Example 2:
+
+```
+Input: nums = [3,2,4], target = 6
+Output: [1,2]
+```
+
+### Example 3:
+
+```
+Input: nums = [3,3], target = 6
+Output: [0,1]
+```
+
+## Constraints
+
+- `2 <= nums.length <= 10^4`
+- `-10^9 <= nums[i] <= 10^9`
+- `-10^9 <= target <= 10^9`
+- Only one valid answer exists.
+
+## Follow-up
+
+Can you come up with an algorithm that is less than O(n²) time complexity?
+
+## Solution
+
+```python
+def twoSum(nums, target):
+    seen = {}
+    for i, num in enumerate(nums):
+        complement = target - num
+        if complement in seen:
+            return [seen[complement], i]
+        seen[num] = i
+```
+
+**Time Complexity:** O(n)
+**Space Complexity:** O(n)
diff --git a/leetcode/two_sum/__init__.py b/leetcode/two_sum/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/leetcode/two_sum/solution.py b/leetcode/two_sum/solution.py
new file mode 100644
index 0000000..9a15d6d
--- /dev/null
+++ b/leetcode/two_sum/solution.py
@@ -0,0 +1,12 @@
+from typing import List
+
+
+class Solution:
+    def two_sum(self, nums: List[int], target: int) -> List[int]:
+        seen: dict[int, int] = {}
+        for i, num in enumerate(nums):
+            remaining = target - num
+            if remaining in seen:
+                return [seen[remaining], i]
+            seen[num] = i
+        return []
diff --git a/leetcode/two_sum/tests.py b/leetcode/two_sum/tests.py
new file mode 100644
index 0000000..c1bc296
--- /dev/null
+++ b/leetcode/two_sum/tests.py
@@ -0,0 +1,22 @@
+import pytest
+from loguru import logger
+
+from .solution import Solution
+
+
+class TestTwoSum:
+    def setup_method(self):
+        self.solution = Solution()
+
+    @pytest.mark.parametrize(
+        "nums, target, expected",
+        [
+            ([2, 7, 11, 15], 9, [0, 1]),
+            ([3, 2, 4], 6, [1, 2]),
+            ([3, 3], 6, [0, 1]),
+        ],
+    )
+    def test_two_sum(self, nums, target, expected):
+        result = self.solution.two_sum(nums, target)
+        assert result == expected
+        logger.success("test")
diff --git a/leetcode_py/__init__.py b/leetcode_py/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/poetry.lock b/poetry.lock
new file mode 100644
index 0000000..0fcfe53
--- /dev/null
+++ b/poetry.lock
@@ -0,0 +1,470 @@
+# This file is automatically @generated by Poetry 2.1.4 and should not be changed by hand.
+
+[[package]]
+name = "black"
+version = "25.1.0"
+description = "The uncompromising code formatter."
+optional = false
+python-versions = ">=3.9"
+groups = ["dev"]
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diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..4d51f96
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,67 @@
+[tool.poetry]
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+version = "0.1.0"
+description = "LeetCode solutions in Python"
+authors = ["Your Name <your.email@example.com>"]
+readme = "README.md"
+
+[tool.poetry.dependencies]
+python = "^3.13"
+
+[tool.poetry.group.dev.dependencies]
+black = "*"
+isort = "*"
+loguru = "*"
+mypy = "*"
+pytest = "*"
+pytest-cov = "*"
+ruff = "*"
+
+[build-system]
+requires = ["poetry-core"]
+build-backend = "poetry.core.masonry.api"
+
+[tool.poetry.requires-plugins]
+poetry-plugin-sort = { version = ">=0.2.2", extras = ["plugin"] }
+
+[tool.black]
+line-length = 105
+target-version = ['py312']
+include = '.*\.(py|ipynb)$' # All .py and .ipynb files
+extend-exclude = '''
+/(
+    leetcode/_template
+)/
+'''
+
+[tool.isort]
+line_length = 105
+multi_line_output = 3
+include_trailing_comma = true
+force_grid_wrap = 0
+combine_as_imports = true
+use_parentheses = true
+ensure_newline_before_comments = true
+extend_skip_glob = ["leetcode/_template/*"]
+
+[tool.ruff]
+line-length = 105
+target-version = 'py312'
+extend-exclude = ["leetcode/_template"]
+
+[tool.ruff.lint.pydocstyle]
+convention = "numpy"
+
+[tool.mypy]
+files = '**/*.py'
+warn_unused_configs = true
+ignore_missing_imports = true
+disable_error_code = ["return", "no-redef"]
+exclude = ["leetcode/_template"]
+
+[tool.pytest.ini_options]
+testpaths = ["leetcode"]
+python_files = ["tests.py"]
+python_classes = ["Test*"]
+python_functions = ["test_*"]
+addopts = "-v --tb=short"
diff --git a/scripts/shared b/scripts/shared
new file mode 160000
index 0000000..40e5b47
--- /dev/null
+++ b/scripts/shared
@@ -0,0 +1 @@
+Subproject commit 40e5b476ab3a3d8cbe5d0fe6fc695d2dc172622c