2018 Day 24 Work

2018/day24/army.go

@@ -0,0 +1,80 @@
+package main
+
+type Army struct {
+	tp         int
+	units      int
+	hp         int
+	immunities []string
+	weaknesses []string
+	damageType string
+	strength   int
+	init       int
+}
+
+func NewArmy(inp string, tp int) *Army {
+	a := new(Army)
+	a.tp = tp
+
+	// Pull the parenthetical out, if one is there
+	var prnth, other string
+	var inPrnth bool
+	var ptsOfOther int
+	for _, v := range strings.Fields(inp) {
+		if len(v) > 0 && v[len(v)-1] == ')' {
+			prnth = prnth + " " + v
+			inPrnth = false
+			continue
+		} else if len(v) > 0 && v[0] == '(' {
+			inPrnth = true
+			prnth = v
+			continue
+		}
+		if inPrnth {
+			prnth = prnth + " " + v
+		} else {
+			if len(other) > 0 {
+				other = other + " "
+			}
+			other = other + v
+			ptsOfOther++
+		}
+	}
+	_, err := fmt.Sscanf(other, "%d units each with %d hit points with an attack that does %d %s damage at initiative %d", &a.units, &a.hp, &a.strength, &a.damageType, &a.init)
+	if err != nil {
+		panic(err)
+	}
+  // Now parse out immunities and weaknesses
+  if len(prnth) > 3 {
+    prnth = prnth[1:len(prnth)-1]
+    var inImmune bool 
+    for _, v := range strings.Fields(prnth) {
+      if v == "immune" {
+        inImmune = true
+      } else if v == "weak" {
+        inImmune = false
+      }
+      if v == "to" {
+        continue
+      }
+      if v[len(v)-1] == ';' || v[len(v)-1] == ',' {
+        v = v[:len(v)-1]
+      }
+      if inImmune {
+        a.immunities = append(a.immunities, v)
+      } else {
+        a.weaknesses = append(a.weaknesses, v)
+      }
+    }
+  }
+	return a
+}
+
+func (a *Army) Power() int {
+	return a.units * a.strength
+}
+
+// Army Sorting
+type ByPower []Army
+func (b ByPower) Len() int { return len(b) }
+func (b ByPower) Swap(i, j int) { b[i], b[j] = b[j], b[i] }
+func (b ByPower) Less(i, j int) { b[i].Power() < b[j].Power() }

2018/day24/combat.go

@@ -0,0 +1,10 @@
+package main
+
+// All Battle Logic is in here
+func Battle(army1, army2 []Army) {
+  allCombatants = append(army1, army2...)
+  sort.Sort(ByPower(allCombatants))
+  for _, v := range allCombatants {
+    fmt.Print("%d %d %d (%d)\n", v.tp, v.units, v.hp, v.Power())
+  }
+}

2018/day24/day24.go

@@ -15,7 +15,11 @@ const (
 func main() {
 	inp := StdinToStringSlice()
 	immune, infect := ParseInput(inp)
-
+  for _, v := range immune {
+    fmt.Println("++ ", v.immunities)
+    fmt.Println("-- ", v.weaknesses)
+  }
+  _, _ = immune, infect
 }
 
 func ParseInput(inp []string) ([]Army, []Army) {
@@ -42,58 +46,6 @@ func ParseInput(inp []string) ([]Army, []Army) {
 	return immune, infection
 }
 
-type AttackType int
-
-type Army struct {
-	tp         int
-	units      int
-	hp         int
-	immunities []string
-	weaknesses []string
-	damageType string
-	strength   int
-	init       int
-}
-
-func NewArmy(inp string, tp int) *Army {
-	a := new(Army)
-	a.tp = tp
-
-	// Pull the parenthetical out, if one is there
-	var prnth, other string
-	var inPrnth bool
-	var ptsOfOther int
-	for _, v := range strings.Fields(inp) {
-		if len(v) > 0 && v[len(v)-1] == ')' {
-			prnth = prnth + " " + v
-			inPrnth = false
-			continue
-		} else if len(v) > 0 && v[0] == '(' {
-			inPrnth = true
-			prnth = v
-			continue
-		}
-		if inPrnth {
-			prnth = prnth + " " + v
-		} else {
-			if len(other) > 0 {
-				other = other + " "
-			}
-			other = other + v
-			ptsOfOther++
-		}
-	}
-	_, err := fmt.Sscanf(other, "%d units each with %d hit points with an attack that does %d %s damage at initiative %d", &a.units, &a.hp, &a.strength, &a.damageType, &a.init)
-	if err != nil {
-		panic(err)
-	}
-	return a
-}
-
-func (a *Army) Power() int {
-	return a.units * a.strength
-}
-
 func StdinToStringSlice() []string {
 	var input []string
 	scanner := bufio.NewScanner(os.Stdin)

2018/day24/problem

@@ -0,0 +1,231 @@
+Advent of Code
+
+--- Day 24: Immune System Simulator 20XX ---
+
+   After a weird buzzing noise, you appear back at the man's cottage. He seems
+   relieved to see his friend, but quickly notices that the little reindeer
+   caught some kind of cold while out exploring.
+
+   The portly man explains that this reindeer's immune system isn't similar to
+   regular reindeer immune systems:
+
+   The immune system and the infection each have an army made up of several
+   groups; each group consists of one or more identical units. The armies
+   repeatedly fight until only one army has units remaining.
+
+   Units within a group all have the same hit points (amount of damage a unit
+   can take before it is destroyed), attack damage (the amount of damage each
+   unit deals), an attack type, an initiative (higher initiative units attack
+   first and win ties), and sometimes weaknesses or immunities. Here is an
+   example group:
+
+ 18 units each with 729 hit points (weak to fire; immune to cold, slashing)
+ with an attack that does 8 radiation damage at initiative 10
+
+   Each group also has an effective power: the number of units in that group
+   multiplied by their attack damage. The above group has an effective power of
+   18 * 8 = 144. Groups never have zero or negative units; instead, the group
+   is removed from combat.
+
+   Each fight consists of two phases: target selection and attacking.
+
+   During the target selection phase, each group attempts to choose one target.
+   In decreasing order of effective power, groups choose their targets; in a
+   tie, the group with the higher initiative chooses first. The attacking group
+   chooses to target the group in the enemy army to which it would deal the
+   most damage (after accounting for weaknesses and immunities, but not
+   accounting for whether the defending group has enough units to actually
+   receive all of that damage).
+
+   If an attacking group is considering two defending groups to which it would
+   deal equal damage, it chooses to target the defending group with the largest
+   effective power; if there is still a tie, it chooses the defending group
+   with the highest initiative. If it cannot deal any defending groups damage,
+   it does not choose a target. Defending groups can only be chosen as a target
+   by one attacking group.
+
+   At the end of the target selection phase, each group has selected zero or
+   one groups to attack, and each group is being attacked by zero or one
+   groups.
+
+   During the attacking phase, each group deals damage to the target it
+   selected, if any. Groups attack in decreasing order of initiative,
+   regardless of whether they are part of the infection or the immune system.
+   (If a group contains no units, it cannot attack.)
+
+   The damage an attacking group deals to a defending group depends on the
+   attacking group's attack type and the defending group's immunities and
+   weaknesses. By default, an attacking group would deal damage equal to its
+   effective power to the defending group. However, if the defending group is
+   immune to the attacking group's attack type, the defending group instead
+   takes no damage; if the defending group is weak to the attacking group's
+   attack type, the defending group instead takes double damage.
+
+   The defending group only loses whole units from damage; damage is always
+   dealt in such a way that it kills the most units possible, and any remaining
+   damage to a unit that does not immediately kill it is ignored. For example,
+   if a defending group contains 10 units with 10 hit points each and receives
+   75 damage, it loses exactly 7 units and is left with 3 units at full health.
+
+   After the fight is over, if both armies still contain units, a new fight
+   begins; combat only ends once one army has lost all of its units.
+
+   For example, consider the following armies:
+
+ Immune System:
+ 17 units each with 5390 hit points (weak to radiation, bludgeoning) with
+  an attack that does 4507 fire damage at initiative 2
+ 989 units each with 1274 hit points (immune to fire; weak to bludgeoning,
+  slashing) with an attack that does 25 slashing damage at initiative 3
+
+ Infection:
+ 801 units each with 4706 hit points (weak to radiation) with an attack
+  that does 116 bludgeoning damage at initiative 1
+ 4485 units each with 2961 hit points (immune to radiation; weak to fire,
+  cold) with an attack that does 12 slashing damage at initiative 4
+
+   If these armies were to enter combat, the following fights, including details during the target selection and attacking phases, would take place:
+
+ Immune System:
+ Group 1 contains 17 units
+ Group 2 contains 989 units
+ Infection:
+ Group 1 contains 801 units
+ Group 2 contains 4485 units
+
+ Infection group 1 would deal defending group 1 185832 damage
+ Infection group 1 would deal defending group 2 185832 damage
+ Infection group 2 would deal defending group 2 107640 damage
+ Immune System group 1 would deal defending group 1 76619 damage
+ Immune System group 1 would deal defending group 2 153238 damage
+ Immune System group 2 would deal defending group 1 24725 damage
+
+ Infection group 2 attacks defending group 2, killing 84 units
+ Immune System group 2 attacks defending group 1, killing 4 units
+ Immune System group 1 attacks defending group 2, killing 51 units
+ Infection group 1 attacks defending group 1, killing 17 units
+
+ Immune System:
+ Group 2 contains 905 units
+ Infection:
+ Group 1 contains 797 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 184904 damage
+ Immune System group 2 would deal defending group 1 22625 damage
+ Immune System group 2 would deal defending group 2 22625 damage
+
+ Immune System group 2 attacks defending group 1, killing 4 units
+ Infection group 1 attacks defending group 2, killing 144 units
+
+ Immune System:
+ Group 2 contains 761 units
+ Infection:
+ Group 1 contains 793 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 183976 damage
+ Immune System group 2 would deal defending group 1 19025 damage
+ Immune System group 2 would deal defending group 2 19025 damage
+
+ Immune System group 2 attacks defending group 1, killing 4 units
+ Infection group 1 attacks defending group 2, killing 143 units
+
+ Immune System:
+ Group 2 contains 618 units
+ Infection:
+ Group 1 contains 789 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 183048 damage
+ Immune System group 2 would deal defending group 1 15450 damage
+ Immune System group 2 would deal defending group 2 15450 damage
+
+ Immune System group 2 attacks defending group 1, killing 3 units
+ Infection group 1 attacks defending group 2, killing 143 units
+
+ Immune System:
+ Group 2 contains 475 units
+ Infection:
+ Group 1 contains 786 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 182352 damage
+ Immune System group 2 would deal defending group 1 11875 damage
+ Immune System group 2 would deal defending group 2 11875 damage
+
+ Immune System group 2 attacks defending group 1, killing 2 units
+ Infection group 1 attacks defending group 2, killing 142 units
+
+ Immune System:
+ Group 2 contains 333 units
+ Infection:
+ Group 1 contains 784 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 181888 damage
+ Immune System group 2 would deal defending group 1 8325 damage
+ Immune System group 2 would deal defending group 2 8325 damage
+
+ Immune System group 2 attacks defending group 1, killing 1 unit
+ Infection group 1 attacks defending group 2, killing 142 units
+
+ Immune System:
+ Group 2 contains 191 units
+ Infection:
+ Group 1 contains 783 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 181656 damage
+ Immune System group 2 would deal defending group 1 4775 damage
+ Immune System group 2 would deal defending group 2 4775 damage
+
+ Immune System group 2 attacks defending group 1, killing 1 unit
+ Infection group 1 attacks defending group 2, killing 142 units
+
+ Immune System:
+ Group 2 contains 49 units
+ Infection:
+ Group 1 contains 782 units
+ Group 2 contains 4434 units
+
+ Infection group 1 would deal defending group 2 181424 damage
+ Immune System group 2 would deal defending group 1 1225 damage
+ Immune System group 2 would deal defending group 2 1225 damage
+
+ Immune System group 2 attacks defending group 1, killing 0 units
+ Infection group 1 attacks defending group 2, killing 49 units
+
+ Immune System:
+ No groups remain.
+ Infection:
+ Group 1 contains 782 units
+ Group 2 contains 4434 units
+
+   In the example above, the winning army ends up with 782 + 4434 = 5216 units.
+
+   You scan the reindeer's condition (your puzzle input); the white-bearded man looks nervous. As it stands now, how many units would the winning army have?
+
+   To begin, get your puzzle input.
+
+   Answer: _____________________ [ [Submit] ]
+
+References
+
+   Visible links
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+   . https://www.youtube.com/watch?v=NDVjLt_QHL8&t=7
+   . https://adventofcode.com/2018/day/24/input