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2015/day21/problem

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+                                           Advent of Code
+
+   br0xen 42*
+
+     • [About]
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+
+--- Day 21: RPG Simulator 20XX ---
+
+   Little Henry Case got a new video game for Christmas. It's an RPG, and he's stuck on a boss.
+   He needs to know what equipment to buy at the shop. He hands you the controller.
+
+   In this game, the player (you) and the enemy (the boss) take turns attacking. The player
+   always goes first. Each attack reduces the opponent's hit points by at least 1. The first
+   character at or below 0 hit points loses.
+
+   Damage dealt by an attacker each turn is equal to the attacker's damage score minus the
+   defender's armor score. An attacker always does at least 1 damage. So, if the attacker has a
+   damage score of 8, and the defender has an armor score of 3, the defender loses 5 hit points.
+   If the defender had an armor score of 300, the defender would still lose 1 hit point.
+
+   Your damage score and armor score both start at zero. They can be increased by buying items in
+   exchange for gold. You start with no items and have as much gold as you need. Your total
+   damage or armor is equal to the sum of those stats from all of your items. You have 100 hit
+   points.
+
+   Here is what the item shop is selling:
+
+ Weapons:    Cost  Damage  Armor
+ Dagger        8     4       0
+ Shortsword   10     5       0
+ Warhammer    25     6       0
+ Longsword    40     7       0
+ Greataxe     74     8       0
+
+ Armor:      Cost  Damage  Armor
+ Leather      13     0       1
+ Chainmail    31     0       2
+ Splintmail   53     0       3
+ Bandedmail   75     0       4
+ Platemail   102     0       5
+
+ Rings:      Cost  Damage  Armor
+ Damage +1    25     1       0
+ Damage +2    50     2       0
+ Damage +3   100     3       0
+ Defense +1   20     0       1
+ Defense +2   40     0       2
+ Defense +3   80     0       3
+
+   You must buy exactly one weapon; no dual-wielding. Armor is optional, but you can't use more
+   than one. You can buy 0-2 rings (at most one for each hand). You must use any items you buy.
+   The shop only has one of each item, so you can't buy, for example, two rings of Damage +3.
+
+   For example, suppose you have 8 hit points, 5 damage, and 5 armor, and that the boss has 12
+   hit points, 7 damage, and 2 armor:
+
+     • The player deals 5-2 = 3 damage; the boss goes down to 9 hit points.
+     • The boss deals 7-5 = 2 damage; the player goes down to 6 hit points.
+     • The player deals 5-2 = 3 damage; the boss goes down to 6 hit points.
+     • The boss deals 7-5 = 2 damage; the player goes down to 4 hit points.
+     • The player deals 5-2 = 3 damage; the boss goes down to 3 hit points.
+     • The boss deals 7-5 = 2 damage; the player goes down to 2 hit points.
+     • The player deals 5-2 = 3 damage; the boss goes down to 0 hit points.
+
+   In this scenario, the player wins! (Barely.)
+
+   You have 100 hit points. The boss's actual stats are in your puzzle input. What is the least
+   amount of gold you can spend and still win the fight?
+
+   Your puzzle answer was 91.
+
+--- Part Two ---
+
+   Turns out the shopkeeper is working with the boss, and can persuade you to buy whatever items
+   he wants. The other rules still apply, and he still only has one of each item.
+
+   What is the most amount of gold you can spend and still lose the fight?
+
+   Your puzzle answer was 158.
+
+   Both parts of this puzzle are complete! They provide two gold stars: **
+
+   At this point, you should return to your advent calendar and try another puzzle.
+
+   If you still want to see it, you can get your puzzle input.
+
+   You can also [Shareon Twitter Google+ Reddit] this puzzle.
+
+References
+
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+   . https://en.wikipedia.org/wiki/Role-playing_video_game
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