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2015 day 21
continuous-integration/drone/push Build is passing Details

This commit is contained in:
Ben Harris 2023-09-21 15:52:03 -04:00
parent e8b6d5026c
commit 35e5210e60
2 changed files with 73 additions and 4 deletions
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1
AOC.Test/Test2015.cs
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@ -26,6 +26,7 @@ public class Test2015
[DataRow(typeof(Day18), "1061", "1006")]
[DataRow(typeof(Day19), "576", "207")]
[DataRow(typeof(Day20), "665280", "705600")]
[DataRow(typeof(Day21), "78", "148")]
public void CheckAllDays(Type dayType, string part1, string part2)
{
Common.CheckDay(dayType, part1, part2);

76
AOC2015/Day21.cs
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@ -5,11 +5,79 @@ namespace AOC2015;
/// </summary>
public sealed class Day21() : Day(2015, 21, "RPG Simulator 20XX")
{
public override void ProcessInput()
private const int PlayerHp = 100;
private IEnumerable<Combination>? _combinations;
private Dictionary<string, int>? _boss;
private record Combination(Item Weapon, Item Armor, Item Ring1, Item Ring2)
{
public int TotalDamage => Weapon.Damage + Ring1.Damage + Ring2.Damage;
public int TotalArmor => Armor.Armor + Ring1.Armor + Ring2.Armor;
public int TotalCost => Weapon.Cost + Armor.Cost + Ring1.Cost + Ring2.Cost;
}
public override object Part1() => "";
private record Item(string Name, int Cost = 0, int Damage = 0, int Armor = 0);
public override object Part2() => "";
}
public override void ProcessInput()
{
_boss = Input.ToDictionary(k => k.Split(": ")[0], v => int.Parse(v.Split(": ")[1]));
var weapons = new Item[]
{
new(Name: "Dagger", Cost: 8, Damage: 4),
new(Name: "Shortsword", Cost: 10, Damage: 5),
new(Name: "Warhammer", Cost: 25, Damage: 6),
new(Name: "Longsword", Cost: 40, Damage: 7),
new(Name: "Greataxe", Cost: 74, Damage: 8)
};
var armor = new Item[]
{
new(Name: "No armor", Cost: 0, Armor: 0),
new(Name: "Leather", Cost: 13, Armor: 1),
new(Name: "Chainmail", Cost: 31, Armor: 2),
new(Name: "Splintmail", Cost: 53, Armor: 3),
new(Name: "Bandedmail", Cost: 75, Armor: 4),
new(Name: "Platemail", Cost: 102, Armor: 5)
};
var rings = new Item[]
{
new(Name: "No ring", Cost: 0, Damage: 0, Armor: 0),
new(Name: "Damage +1", Cost: 25, Damage: 1, Armor: 0),
new(Name: "Damage +2", Cost: 50, Damage: 2, Armor: 0),
new(Name: "Damage +3", Cost: 100, Damage: 3, Armor: 0),
new(Name: "Defense +1", Cost: 20, Damage: 0, Armor: 1),
new(Name: "Defense +2", Cost: 40, Damage: 0, Armor: 2),
new(Name: "Defense +3", Cost: 80, Damage: 0, Armor: 3)
};
_combinations =
from w in weapons
from a in armor
from ring1 in rings
from ring2 in rings
where ring1.Cost == 0 || ring1.Cost != ring2.Cost
select new Combination(w, a, ring1, ring2);
}
private bool StillAlive(Combination combination)
{
var myDamage = Math.Max(combination.TotalDamage - _boss!["Armor"], 1);
var bossDamagePerTurn = Math.Max(_boss["Damage"] - combination.TotalArmor, 1);
var turnsToLose = PlayerHp / bossDamagePerTurn;
if (PlayerHp % bossDamagePerTurn > 0) turnsToLose++;
var turnsToKillBoss = _boss["Hit Points"] / myDamage;
if (_boss["Hit Points"] % myDamage > 0) turnsToKillBoss++;
return turnsToLose >= turnsToKillBoss;
}
public override object Part1() =>
_combinations!.Where(StillAlive).Min(c => c.TotalCost);
public override object Part2() =>
_combinations!.Where(c => !StillAlive(c)).Max(c => c.TotalCost);
}