2022 Day 5 Complete

2022/day05/problem

@@ -0,0 +1,161 @@
+Advent of Code
+br0xen (AoC++) 10*
+
+--- Day 5: Supply Stacks ---
+
+   The expedition can depart as soon as the final supplies have been unloaded from the
+   ships. Supplies are stored in stacks of marked crates, but because the needed supplies
+   are buried under many other crates, the crates need to be rearranged.
+
+   The ship has a giant cargo crane capable of moving crates between stacks. To ensure none
+   of the crates get crushed or fall over, the crane operator will rearrange them in a
+   series of carefully-planned steps. After the crates are rearranged, the desired crates
+   will be at the top of each stack.
+
+   The Elves don't want to interrupt the crane operator during this delicate procedure, but
+   they forgot to ask her which crate will end up where, and they want to be ready to unload
+   them as soon as possible so they can embark.
+
+   They do, however, have a drawing of the starting stacks of crates and the rearrangement
+   procedure (your puzzle input). For example:
+
+     [D]
+ [N] [C]
+ [Z] [M] [P]
+  1   2   3
+
+ move 1 from 2 to 1
+ move 3 from 1 to 3
+ move 2 from 2 to 1
+ move 1 from 1 to 2
+
+   In this example, there are three stacks of crates. Stack 1 contains two crates: crate Z
+   is on the bottom, and crate N is on top. Stack 2 contains three crates; from bottom to
+   top, they are crates M, C, and D. Finally, stack 3 contains a single crate, P.
+
+   Then, the rearrangement procedure is given. In each step of the procedure, a quantity of
+   crates is moved from one stack to a different stack. In the first step of the above
+   rearrangement procedure, one crate is moved from stack 2 to stack 1, resulting in this
+   configuration:
+
+ [D]
+ [N] [C]
+ [Z] [M] [P]
+  1   2   3
+
+   In the second step, three crates are moved from stack 1 to stack 3. Crates are moved one
+   at a time, so the first crate to be moved (D) ends up below the second and third crates:
+
+         [Z]
+         [N]
+     [C] [D]
+     [M] [P]
+  1   2   3
+
+   Then, both crates are moved from stack 2 to stack 1. Again, because crates are moved one
+   at a time, crate C ends up below crate M:
+
+         [Z]
+         [N]
+ [M]     [D]
+ [C]     [P]
+  1   2   3
+
+   Finally, one crate is moved from stack 1 to stack 2:
+
+         [Z]
+         [N]
+         [D]
+ [C] [M] [P]
+  1   2   3
+
+   The Elves just need to know which crate will end up on top of each stack; in this
+   example, the top crates are C in stack 1, M in stack 2, and Z in stack 3, so you should
+   combine these together and give the Elves the message CMZ.
+
+   After the rearrangement procedure completes, what crate ends up on top of each stack?
+
+   Your puzzle answer was PTWLTDSJV.
+
+--- Part Two ---
+
+   As you watch the crane operator expertly rearrange the crates, you notice the process
+   isn't following your prediction.
+
+   Some mud was covering the writing on the side of the crane, and you quickly wipe it away.
+   The crane isn't a CrateMover 9000 - it's a CrateMover 9001.
+
+   The CrateMover 9001 is notable for many new and exciting features: air conditioning,
+   leather seats, an extra cup holder, and the ability to pick up and move multiple crates
+   at once.
+
+   Again considering the example above, the crates begin in the same configuration:
+
+     [D]
+ [N] [C]
+ [Z] [M] [P]
+  1   2   3
+
+   Moving a single crate from stack 2 to stack 1 behaves the same as before:
+
+ [D]
+ [N] [C]
+ [Z] [M] [P]
+  1   2   3
+
+   However, the action of moving three crates from stack 1 to stack 3 means that those three
+   moved crates stay in the same order, resulting in this new configuration:
+
+         [D]
+         [N]
+     [C] [Z]
+     [M] [P]
+  1   2   3
+
+   Next, as both crates are moved from stack 2 to stack 1, they retain their order as well:
+
+         [D]
+         [N]
+ [C]     [Z]
+ [M]     [P]
+  1   2   3
+
+   Finally, a single crate is still moved from stack 1 to stack 2, but now it's crate C that
+   gets moved:
+
+         [D]
+         [N]
+         [Z]
+ [M] [C] [P]
+  1   2   3
+
+   In this example, the CrateMover 9001 has put the crates in a totally different order:
+   MCD.
+
+   Before the rearrangement process finishes, update your simulation so that the Elves know
+   where they should stand to be ready to unload the final supplies. After the rearrangement
+   procedure completes, what crate ends up on top of each stack?
+
+   Your puzzle answer was WZMFVGGZP.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+References
+
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