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Brian Buller
2018-03-15 11:24:23 -05:00
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@@ -2,30 +2,37 @@ Advent of Code
--- Day 20: Firewall Rules ---
You'd like to set up a small hidden computer here so you can use it to get back into the network later. However, the corporate firewall only allows communication with certain external
IP addresses.
You'd like to set up a small hidden computer here so you can use it to get
back into the network later. However, the corporate firewall only allows
communication with certain external IP addresses.
You've retrieved the list of blocked IPs from the firewall, but the list seems to be messy and poorly maintained, and it's not clear which IPs are allowed. Also, rather than being
written in dot-decimal notation, they are written as plain 32-bit integers, which can have any value from 0 through 4294967295, inclusive.
You've retrieved the list of blocked IPs from the firewall, but the list
seems to be messy and poorly maintained, and it's not clear which IPs are
allowed. Also, rather than being written in dot-decimal notation, they are
written as plain 32-bit integers, which can have any value from 0 through
4294967295, inclusive.
For example, suppose only the values 0 through 9 were valid, and that you retrieved the following blacklist:
For example, suppose only the values 0 through 9 were valid, and that you
retrieved the following blacklist:
5-8
0-2
4-7
The blacklist specifies ranges of IPs (inclusive of both the start and end value) that are not allowed. Then, the only IPs that this firewall allows are 3 and 9, since those are the
only numbers not in any range.
The blacklist specifies ranges of IPs (inclusive of both the start and end
value) that are not allowed. Then, the only IPs that this firewall allows
are 3 and 9, since those are the only numbers not in any range.
Given the list of blocked IPs you retrieved from the firewall (your puzzle input), what is the lowest-valued IP that is not blocked?
Given the list of blocked IPs you retrieved from the firewall (your puzzle
input), what is the lowest-valued IP that is not blocked?
Your puzzle answer was _______________.
Your puzzle answer was 31053880.
--- Part Two ---
How many IPs are allowed by the blacklist?
Your puzzle answer was _______________.
Your puzzle answer was 117.
References