183 lines
6.4 KiB
Plaintext
183 lines
6.4 KiB
Plaintext
Advent of Code
|
||
|
||
--- Day 22: Wizard Simulator 20XX ---
|
||
|
||
Little Henry Case decides that defeating bosses with swords and stuff is
|
||
boring. Now he's playing the game with a wizard. Of course, he gets stuck on
|
||
another boss and needs your help again.
|
||
|
||
In this version, combat still proceeds with the player and the boss taking
|
||
alternating turns. The player still goes first. Now, however, you don't get
|
||
any equipment; instead, you must choose one of your spells to cast. The
|
||
first character at or below 0 hit points loses.
|
||
|
||
Since you're a wizard, you don't get to wear armor, and you can't attack
|
||
normally. However, since you do magic damage, your opponent's armor is
|
||
ignored, and so the boss effectively has zero armor as well. As before, if
|
||
armor (from a spell, in this case) would reduce damage below 1, it becomes 1
|
||
instead - that is, the boss' attacks always deal at least 1 damage.
|
||
|
||
On each of your turns, you must select one of your spells to cast. If you
|
||
cannot afford to cast any spell, you lose. Spells cost mana; you start with
|
||
500 mana, but have no maximum limit. You must have enough mana to cast a
|
||
spell, and its cost is immediately deducted when you cast it. Your spells
|
||
are Magic Missile, Drain, Shield, Poison, and Recharge.
|
||
|
||
• Magic Missile costs 53 mana. It instantly does 4 damage.
|
||
|
||
• Drain costs 73 mana. It instantly does 2 damage and heals you for 2 hit
|
||
points.
|
||
|
||
• Shield costs 113 mana. It starts an effect that lasts for 6 turns. While
|
||
it is active, your armor is increased by 7.
|
||
|
||
• Poison costs 173 mana. It starts an effect that lasts for 6 turns. At
|
||
the start of each turn while it is active, it deals the boss 3 damage.
|
||
|
||
• Recharge costs 229 mana. It starts an effect that lasts for 5 turns. At
|
||
the start of each turn while it is active, it gives you 101 new mana.
|
||
|
||
Effects all work the same way. Effects apply at the start of both the
|
||
player's turns and the boss' turns. Effects are created with a timer (the
|
||
number of turns they last); at the start of each turn, after they apply any
|
||
effect they have, their timer is decreased by one. If this decreases the
|
||
timer to zero, the effect ends. You cannot cast a spell that would start an
|
||
effect which is already active. However, effects can be started on the same
|
||
turn they end.
|
||
|
||
For example, suppose the player has 10 hit points and 250 mana, and that the
|
||
boss has 13 hit points and 8 damage:
|
||
|
||
-- Player turn --
|
||
- Player has 10 hit points, 0 armor, 250 mana
|
||
- Boss has 13 hit points
|
||
Player casts Poison.
|
||
|
||
-- Boss turn --
|
||
- Player has 10 hit points, 0 armor, 77 mana
|
||
- Boss has 13 hit points
|
||
Poison deals 3 damage; its timer is now 5.
|
||
Boss attacks for 8 damage.
|
||
|
||
-- Player turn --
|
||
- Player has 2 hit points, 0 armor, 77 mana
|
||
- Boss has 10 hit points
|
||
Poison deals 3 damage; its timer is now 4.
|
||
Player casts Magic Missile, dealing 4 damage.
|
||
|
||
-- Boss turn --
|
||
- Player has 2 hit points, 0 armor, 24 mana
|
||
- Boss has 3 hit points
|
||
Poison deals 3 damage. This kills the boss, and the player wins.
|
||
|
||
Now, suppose the same initial conditions, except that the boss has 14 hit
|
||
points instead:
|
||
|
||
-- Player turn --
|
||
- Player has 10 hit points, 0 armor, 250 mana
|
||
- Boss has 14 hit points
|
||
Player casts Recharge.
|
||
|
||
-- Boss turn --
|
||
- Player has 10 hit points, 0 armor, 21 mana
|
||
- Boss has 14 hit points
|
||
Recharge provides 101 mana; its timer is now 4.
|
||
Boss attacks for 8 damage!
|
||
|
||
-- Player turn --
|
||
- Player has 2 hit points, 0 armor, 122 mana
|
||
- Boss has 14 hit points
|
||
Recharge provides 101 mana; its timer is now 3.
|
||
Player casts Shield, increasing armor by 7.
|
||
|
||
-- Boss turn --
|
||
- Player has 2 hit points, 7 armor, 110 mana
|
||
- Boss has 14 hit points
|
||
Shield's timer is now 5.
|
||
Recharge provides 101 mana; its timer is now 2.
|
||
Boss attacks for 8 - 7 = 1 damage!
|
||
|
||
-- Player turn --
|
||
- Player has 1 hit point, 7 armor, 211 mana
|
||
- Boss has 14 hit points
|
||
Shield's timer is now 4.
|
||
Recharge provides 101 mana; its timer is now 1.
|
||
Player casts Drain, dealing 2 damage, and healing 2 hit points.
|
||
|
||
-- Boss turn --
|
||
- Player has 3 hit points, 7 armor, 239 mana
|
||
- Boss has 12 hit points
|
||
Shield's timer is now 3.
|
||
Recharge provides 101 mana; its timer is now 0.
|
||
Recharge wears off.
|
||
Boss attacks for 8 - 7 = 1 damage!
|
||
|
||
-- Player turn --
|
||
- Player has 2 hit points, 7 armor, 340 mana
|
||
- Boss has 12 hit points
|
||
Shield's timer is now 2.
|
||
Player casts Poison.
|
||
|
||
-- Boss turn --
|
||
- Player has 2 hit points, 7 armor, 167 mana
|
||
- Boss has 12 hit points
|
||
Shield's timer is now 1.
|
||
Poison deals 3 damage; its timer is now 5.
|
||
Boss attacks for 8 - 7 = 1 damage!
|
||
|
||
-- Player turn --
|
||
- Player has 1 hit point, 7 armor, 167 mana
|
||
- Boss has 9 hit points
|
||
Shield's timer is now 0.
|
||
Shield wears off, decreasing armor by 7.
|
||
Poison deals 3 damage; its timer is now 4.
|
||
Player casts Magic Missile, dealing 4 damage.
|
||
|
||
-- Boss turn --
|
||
- Player has 1 hit point, 0 armor, 114 mana
|
||
- Boss has 2 hit points
|
||
Poison deals 3 damage. This kills the boss, and the player wins.
|
||
|
||
You start with 50 hit points and 500 mana points. The boss's actual stats
|
||
are in your puzzle input. What is the least amount of mana you can spend and
|
||
still win the fight? (Do not include mana recharge effects as "spending"
|
||
negative mana.)
|
||
|
||
Your puzzle answer was 1824.
|
||
|
||
--- Part Two ---
|
||
|
||
On the next run through the game, you increase the difficulty to hard.
|
||
|
||
At the start of each player turn (before any other effects apply), you lose
|
||
1 hit point. If this brings you to or below 0 hit points, you lose.
|
||
|
||
With the same starting stats for you and the boss, what is the least amount
|
||
of mana you can spend and still win the fight?
|
||
|
||
Your puzzle answer was 1937.
|
||
|
||
Both parts of this puzzle are complete! They provide two gold stars: **
|
||
|
||
At this point, all that is left is for you to admire your advent calendar.
|
||
|
||
If you still want to see it, you can get your puzzle input.
|
||
|
||
References
|
||
|
||
Visible links
|
||
. http://adventofcode.com/
|
||
. http://adventofcode.com/2015/about
|
||
. http://adventofcode.com/2015/support
|
||
. http://adventofcode.com/2015/events
|
||
. http://adventofcode.com/2015/settings
|
||
. http://adventofcode.com/2015/auth/logout
|
||
. http://adventofcode.com/2015
|
||
. http://adventofcode.com/2015
|
||
. http://adventofcode.com/2015/leaderboard
|
||
. http://adventofcode.com/2015/stats
|
||
. http://adventofcode.com/2015/sponsors
|
||
. http://adventofcode.com/2015/day/21
|
||
. http://adventofcode.com/2015
|
||
. http://adventofcode.com/2015/day/22/input
|