67 lines
1.8 KiB
Python
Executable file
67 lines
1.8 KiB
Python
Executable file
#!/usr/bin/env python3
|
|
|
|
# https://adventofcode.com/2024/day/2
|
|
|
|
def get_lines(filename: str) -> list:
|
|
with open(filename, "r") as file:
|
|
return [line.strip() for line in file.readlines()]
|
|
|
|
|
|
def get_report_entries(lines: list) -> list:
|
|
report_entries = []
|
|
for line in lines:
|
|
entry = [int(x) for x in line.split(" ")]
|
|
report_entries.append(entry)
|
|
return report_entries
|
|
|
|
|
|
def is_safe_single(reports: list) -> bool:
|
|
increasing = True
|
|
decreasing = True
|
|
safe = True
|
|
for i in range(len(reports) - 1):
|
|
if reports[i] >= reports[i + 1]:
|
|
increasing = False
|
|
if reports[i] <= reports[i + 1]:
|
|
decreasing = False
|
|
distance = abs(reports[i] - reports[i + 1])
|
|
if distance < 1 or distance > 3:
|
|
safe = False
|
|
pass
|
|
if safe and (increasing or decreasing):
|
|
return True
|
|
return False
|
|
|
|
|
|
def is_safe_full(reports: list, dampener: bool) -> bool:
|
|
if is_safe_single(reports):
|
|
return True
|
|
if dampener:
|
|
for i in range(len(reports)):
|
|
if is_safe_single(reports[:i] + reports[i + 1:]):
|
|
return True
|
|
return False
|
|
|
|
|
|
def get_safe_reports(report_entries: list, dampener: bool) -> int:
|
|
safe_reports = 0
|
|
for entry in report_entries:
|
|
if is_safe_full(entry, dampener):
|
|
safe_reports += 1
|
|
return safe_reports
|
|
|
|
|
|
def main():
|
|
# lines = get_lines("sample-input.txt")
|
|
lines = get_lines("input.txt")
|
|
report_entries = get_report_entries(lines)
|
|
|
|
safe_reports = get_safe_reports(report_entries, dampener=False)
|
|
print(f"Part 1: There are {safe_reports} safe reports.")
|
|
|
|
safe_reports = get_safe_reports(report_entries, dampener=True)
|
|
print(f"Part 2: There are {safe_reports} safe reports.")
|
|
|
|
|
|
if __name__ == '__main__':
|
|
main()
|