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- --- Day 4: Secure Container ---
- You arrive at the Venus fuel depot only to discover it's protected by a password. The Elves had written the password on a sticky note, but someone threw it out.
- However, they do remember a few key facts about the password:
- It is a six-digit number.
- The value is within the range given in your puzzle input.
- Two adjacent digits are the same (like 22 in 122345).
- Going from left to right, the digits never decrease; they only ever increase or stay the same (like 111123 or 135679).
- Other than the range rule, the following are true:
- 111111 meets these criteria (double 11, never decreases).
- 223450 does not meet these criteria (decreasing pair of digits 50).
- 123789 does not meet these criteria (no double).
- How many different passwords within the range given in your puzzle input meet these criteria?
- Your puzzle answer was 1605.
- The first half of this puzzle is complete! It provides one gold star: *
- --- Part Two ---
- An Elf just remembered one more important detail: the two adjacent matching digits are not part of a larger group of matching digits.
- Given this additional criterion, but still ignoring the range rule, the following are now true:
- 112233 meets these criteria because the digits never decrease and all repeated digits are exactly two digits long.
- 123444 no longer meets the criteria (the repeated 44 is part of a larger group of 444).
- 111122 meets the criteria (even though 1 is repeated more than twice, it still contains a double 22).
- How many different passwords within the range given in your puzzle input meet all of the criteria?
- Your puzzle input is still 193651-649729.
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