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#!/usr/bin/python
def solve_part1(lines):
result = 0
for line in lines:
# Rule 1: at least three vowels
nvowels = 0
for v in "aeiou":
nvowels += line.count(v)
rule1 = nvowels >= 3
# Rule 2: at least one double letter
rule2 = False
for i in range(len(line) - 1):
if line[i] == line[i + 1]:
rule2 = True
break
# Rule 3: no "ab", "cd", "pq" or "xy"
rule3 = True
for s in ["ab", "cd", "pq", "xy"]:
if line.count(s) > 0:
rule3 = False
break
if rule1 and rule2 and rule3:
result += 1
return result
def solve_part2(lines):
result = 0
for line in lines:
# Rule 1: twice-occurring two-letter sequence
rule1 = False
for i in range(len(line) - 1):
s = line[i : i + 2]
if line.count(s) >= 2:
rule1 = True
break
# Rule 2: ABA-like sequence
rule2 = False
for i, c in enumerate(line):
if i < len(line) - 2 and line[i + 2] == c:
rule2 = True
break
if rule1 and rule2:
result += 1
return result
def main():
# Read list of strings from input text file
with open("input.txt", "r") as f:
lines = f.read().splitlines()
print("Part 1 solution:", solve_part1(lines)) # 258 for me
print("Part 2 solution:", solve_part2(lines)) # 53 for me
if __name__ == "__main__":
main()
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