solutions

.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+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.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.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
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.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/

solutions/1/main.py

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+from typing import List
+from itertools import product
+from os.path import join, dirname
+
+target = 2020
+data = join(dirname(__file__), 'data.txt')
+with open(data) as f:
+    numbers: List[int] = list(map(int, f.readlines()))
+    for a, b in product(numbers, numbers):
+        if a + b == target:
+            print(f'The numbers: {a} and {b}.\tSolution: {a*b}')
+            break
+
+    for a, b, c in product(numbers, numbers, numbers):
+        if a + b + c == target:
+            print(f'The numbers: {a}, {b} and {c}.\tSolution: {a*b*c}')
+            break

solutions/2/main.py

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+from typing import List
+from os.path import join, dirname
+
+
+def checkRow(row: str, alternative=False) -> bool:
+    rule, password = map(lambda s: s.strip(), row.split(':'))
+    amount, char = rule.split(' ')
+    minimum, maximum = map(int, amount.split('-'))
+    if alternative:
+        return (password[minimum - 1] == char) ^ (password[maximum - 1] != char)
+    else:
+        occurrences = password.count(char)
+        return minimum <= occurrences <= maximum
+
+
+data = join(dirname(__file__), 'data.txt')
+with open(data) as f:
+    valid = 0
+    valid_alt = 0
+    rows = list(f.read().strip().split('\n'))
+    for row in rows:
+        if(checkRow(row)):
+            valid += 1
+        if(checkRow(row, alternative=True)):
+            valid_alt += 1
+    print(f'Found {valid} valid passwords.')
+    print('Policy changed...')
+    print(f'Found {valid_alt} valid passwords.')