passwords_slow: Secure Container

In Selbosh/adventofcode2019: Advent of Code 2019

Description

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.

Usage

passwords_slow(from = 273025, to = 767253)

Details

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?

Selbosh/adventofcode2019 documentation built on Dec. 18, 2021, 1:03 p.m.