day04.txt

--- 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?

--- 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?