Day 18

4 files changed, 2416 insertions, 142 deletions

diff --git a/day16/solution.nim b/day16/solution.nim
index ae93568..66015d3 100644
--- a/day16/solution.nim
+++ b/day16/solution.nim
@@ -5,25 +5,26 @@ import tables
 import strformat
 import algorithm
 import sets
+import sugar
 
 type
   NodeData = tuple
     pressure: int
-    neighbors: seq[string]
+    neighbors: seq[int64]
 
   Node = tuple
-    id: string
+    id: int64
     data: NodeData
 
-  NodeGraph = Table[string, NodeData]
+  NodeGraph = Table[int64, NodeData]
 
   ExtendedNodeData = tuple
     pressure: int
-    neighbors: Table[string, int]
+    neighbors: Table[int64, int]
 
-  ExtendedNodeGraph = Table[string, ExtendedNodeData]
+  ExtendedNodeGraph = Table[int64, ExtendedNodeData]
 
-proc parseLine(line: string): Node =
+proc parseLine(line: string): auto =
   let tokens = line.replace("Valve ")
                    .replace("has flow rate=")
                    .replace(re"; tunnels? leads? to valves?")
@@ -35,145 +36,157 @@ proc parseFile(content: string): NodeGraph =
   let lines = content.strip().splitLines()
   let nodes = map(lines, parseLine)
 
-  for node in nodes:
-    result[node.id] = node.data
-
-proc bfs(input: NodeGraph, src: string): Table[string, int] =
-  var q = @[(src, 0)]
-  result[src] = 0
-
-  while q.len() > 0:
-    let (curr, pathLen) = q[0]
-    q.delete(0)
-
-    for neighbor in input[curr].neighbors:
-      if result.contains(neighbor):
-        continue
-      result[neighbor] = pathLen+1
-      q.add((neighbor, pathLen+1))
-
-proc setup(input: NodeGraph): ExtendedNodeGraph =
-  for node in input.keys():
-    # Exclude all 0 pressure nodes except the entry node "AA"
-    if (input[node].pressure == 0 and node != "AA"):
-      continue
-    let allConnected = bfs(input, node)
-    var filtConnected: Table[string, int]
-    for conn in allConnected.keys():
-      if input[conn].pressure == 0:
-        continue
-      filtConnected[conn] = allConnected[conn]
-
-    result[node] = (input[node].pressure, filtConnected)
-    # echo fmt"{node} : {result[node]}"
-
-type Agent = tuple
-  valv: string
-  time: int
-
-# Nodes with their neighbors
-var Graph: ExtendedNodeGraph
-# Node names
-var nodes = newSeq[string]()
-
-proc playing(agent: Agent, time: int): bool =
-  agent.time == time
-
-proc agentScores(agent: Agent, time: int): int =
-  Graph[agent.valv].pressure * (time-1)
-
+  # Create stringID to intID mapping
+  var nodeIDs: Table[string, int64]
+  for i, node in nodes:
+    nodeIDs[node[0]] = 1 shl i
+
+  echo nodeIDs
+  # for i, node in nodes:
+  #   result[nodeIDs[nodes[0]]] = (node[1][0], map(node[1][1], (stringID) => nodeIDs[stringID]))
+
+# proc bfs(input: NodeGraph, src: string): Table[string, int] =
+#   var q = @[(src, 0)]
+#   result[src] = 0
+#
+#   while q.len() > 0:
+#     let (curr, pathLen) = q[0]
+#     q.delete(0)
+#
+#     for neighbor in input[curr].neighbors:
+#       if result.contains(neighbor):
+#         continue
+#       result[neighbor] = pathLen+1
+#       q.add((neighbor, pathLen+1))
+#
+# proc setup(input: NodeGraph): ExtendedNodeGraph =
+#   for node in input.keys():
+#     # Exclude all 0 pressure nodes except the entry node "AA"
+#     if (input[node].pressure == 0 and node != "AA"):
+#       continue
+#     let allConnected = bfs(input, node)
+#     var filtConnected: Table[string, int]
+#     for conn in allConnected.keys():
+#       if input[conn].pressure == 0:
+#         continue
+#       filtConnected[conn] = allConnected[conn]
+#
+#     result[node] = (input[node].pressure, filtConnected)
+#     # echo fmt"{node} : {result[node]}"
+#
+# type Agent = tuple
+#   valv: string
+#   time: int
+#
+# # Nodes with their neighbors
+# var Graph: ExtendedNodeGraph
+# # Node names
+# var nodes = newSeq[string]()
+#
+# proc playing(agent: Agent, time: int): bool =
+#   agent.time == time
+#
+# proc agentScores(agent: Agent, time: int): int =
+#   Graph[agent.valv].pressure * (time-1)
+#
 # type ValveSet = uint64
+#
 # proc incl(set: var ValveSet, valve: uint64): void =
 #   set = set or valve
-
-var part2 = false
-proc dfs(visited: HashSet[string], time: int, human, elephant: Agent): int =
-  # echo fmt"time: {time}, human: {human}, elephant: {elephant}"
-  let remainingValves = nodes.len() - visited.len() 
-  if time <= 1 or remainingValves == 0 or (part2 and human.valv == elephant.valv and remainingValves > 1):
-    return 0
-
-  let
-    neighborsHuman = Graph[human.valv].neighbors
-    neighborsElephant = Graph[elephant.valv].neighbors
-  var
-    # check for race
-    humanScore = if human.valv notin visited: human.agentScores(time) else: 0
-    elephantScore = if elephant.valv notin visited: elephant.agentScores(time) else: 0
-
-  var bestNextScore = 0
-  if human.playing(time) and elephant.playing(time):
-    for nextHuman in nodes:
-      for nextElephant in nodes:
-        if nextHuman in visited or nextElephant in visited:
-          continue
-        let
-          nextTimeHuman = time - 1 - neighborsHuman[nextHuman]
-          nextTimeElephant = time - 1 - neighborsElephant[nextElephant]
-          nextTime = max(nextTimeHuman, nextTimeElephant)
-          nextScore = dfs(union(visited, toHashSet(@[elephant.valv, human.valv])), nextTime, (nextHuman, nextTimeHuman), (nextElephant, nextTimeElephant))
-        bestNextScore = max(bestNextScore, nextScore)
-
-    # elephant keeps his score only if he isn't in the same valve as human
-    elephantScore = (if human != elephant: elephantScore else: 0)
-    return bestNextScore + humanScore + elephantScore
-
-  if human.playing(time):
-    for nextHuman in nodes:
-      if nextHuman in visited:
-        continue
-      let
-        nextTimeHuman = time - 1 - neighborsHuman[nextHuman]
-        nextTime = max(nextTimeHuman, elephant.time)
-        nextScore = dfs(union(visited, toHashSet(@[human.valv])), nextTime, (nextHuman, nextTimeHuman), elephant)
-      bestNextScore = max(bestNextScore, nextScore)
-
-    # Check for race
-    return bestNextScore + humanScore
-
-  if elephant.playing(time):
-    for nextElephant in nodes:
-      if nextElephant in visited:
-        continue
-      let
-        nextTimeElephant = time - 1 - neighborsElephant[nextElephant]
-        nextTime = max(human.time, nextTimeElephant)
-        nextScore = dfs(union(visited, toHashSet(@[elephant.valv])), nextTime, human, (nextElephant, nextTimeElephant))
-      bestNextScore = max(bestNextScore, nextScore)
-
-    # Check for race
-    return bestNextScore + elephantScore
-  
-  assert(false)
-
-proc solve(initDelays: Table[string, int], time: int): int =
-
-  if not part2:
-    for human in nodes:
-      let
-        humanStartTime = time - initDelays[human]
-        startTime = humanStartTime
-      result = max(result, dfs(initHashSet[string](), startTime, (human, humanStartTime), (human, -1)))
-  else:
-    for i, human in nodes[0 ..< ^1]:
-      for elephant in nodes[i+1 .. ^1]:
-        let
-          elephantStartTime = time - initDelays[elephant]
-          humanStartTime = time - initDelays[human]
-          startTime = max(elephantStartTime, humanStartTime)
-        result = max(result, dfs(initHashSet[string](), startTime, (human, humanStartTime), (elephant, elephantStartTime)))
+#
+# proc contains(set: ValveSet, valve: uint64): bool =
+#   return (set and valve) > 0
+#
+# var part2 = false
+# proc dfs(visited: ValveSet, time: int, human, elephant: Agent): int =
+#   # echo fmt"time: {time}, human: {human}, elephant: {elephant}"
+#   let remainingValves = nodes.len() - visited.len() 
+#   if time <= 1 or remainingValves == 0 or (part2 and human.valv == elephant.valv and remainingValves > 1):
+#     return 0
+#
+#   let
+#     neighborsHuman = Graph[human.valv].neighbors
+#     neighborsElephant = Graph[elephant.valv].neighbors
+#   var
+#     # check for race
+#     humanScore = if human.valv notin visited: human.agentScores(time) else: 0
+#     elephantScore = if elephant.valv notin visited: elephant.agentScores(time) else: 0
+#
+#   var bestNextScore = 0
+#   if human.playing(time) and elephant.playing(time):
+#     for nextHuman in nodes:
+#       for nextElephant in nodes:
+#         if nextHuman in visited or nextElephant in visited:
+#           continue
+#         let
+#           nextTimeHuman = time - 1 - neighborsHuman[nextHuman]
+#           nextTimeElephant = time - 1 - neighborsElephant[nextElephant]
+#           nextTime = max(nextTimeHuman, nextTimeElephant)
+#           nextScore = dfs(union(visited, toHashSet(@[elephant.valv, human.valv])), nextTime, (nextHuman, nextTimeHuman), (nextElephant, nextTimeElephant))
+#         bestNextScore = max(bestNextScore, nextScore)
+#
+#     # elephant keeps his score only if he isn't in the same valve as human
+#     elephantScore = (if human != elephant: elephantScore else: 0)
+#     return bestNextScore + humanScore + elephantScore
+#
+#   if human.playing(time):
+#     for nextHuman in nodes:
+#       if nextHuman in visited:
+#         continue
+#       let
+#         nextTimeHuman = time - 1 - neighborsHuman[nextHuman]
+#         nextTime = max(nextTimeHuman, elephant.time)
+#         nextScore = dfs(union(visited, toHashSet(@[human.valv])), nextTime, (nextHuman, nextTimeHuman), elephant)
+#       bestNextScore = max(bestNextScore, nextScore)
+#
+#     # Check for race
+#     return bestNextScore + humanScore
+#
+#   if elephant.playing(time):
+#     for nextElephant in nodes:
+#       if nextElephant in visited:
+#         continue
+#       let
+#         nextTimeElephant = time - 1 - neighborsElephant[nextElephant]
+#         nextTime = max(human.time, nextTimeElephant)
+#         nextScore = dfs(union(visited, toHashSet(@[elephant.valv])), nextTime, human, (nextElephant, nextTimeElephant))
+#       bestNextScore = max(bestNextScore, nextScore)
+#
+#     # Check for race
+#     return bestNextScore + elephantScore
+#   
+#   assert(false)
+#
+# proc solve(initDelays: Table[string, int], time: int): int =
+#
+#   if not part2:
+#     for human in nodes:
+#       let
+#         humanStartTime = time - initDelays[human]
+#         startTime = humanStartTime
+#       result = max(result, dfs(initHashSet[string](), startTime, (human, humanStartTime), (human, -1)))
+#   else:
+#     for i, human in nodes[0 ..< ^1]:
+#       for elephant in nodes[i+1 .. ^1]:
+#         let
+#           elephantStartTime = time - initDelays[elephant]
+#           humanStartTime = time - initDelays[human]
+#           startTime = max(elephantStartTime, humanStartTime)
+#         result = max(result, dfs(initHashSet[string](), startTime, (human, humanStartTime), (elephant, elephantStartTime)))
+#
+#
 
 let content = readFile("./example.txt")
-
 let input = parseFile(content)
-Graph = setup(input)
-# Table of delays to get from starting node "AA" to current
-let initDelays = Graph["AA"].neighbors
-Graph.del("AA")
-
-for node in Graph.keys():
-  nodes.add(node)
-
-echo solve(initDelays, 30)
-part2 = true
-echo solve(initDelays, 26)
+echo input
+
+# # Table of delays to get from starting node "AA" to current
+# let initDelays = Graph["AA"].neighbors
+# Graph.del("AA")
+#
+# for node in Graph.keys():
+#   nodes.add(node)
+#
+# echo solve(initDelays, 30)
+# part2 = true
+# echo solve(initDelays, 26)
diff --git a/day18/example.txt b/day18/example.txt
new file mode 100644
index 0000000..73a7202
--- /dev/null
+++ b/day18/example.txt
@@ -0,0 +1,13 @@
+2,2,2
+1,2,2
+3,2,2
+2,1,2
+2,3,2
+2,2,1
+2,2,3
+2,2,4
+2,2,6
+1,2,5
+3,2,5
+2,1,5
+2,3,5
diff --git a/day18/input.txt b/day18/input.txt
new file mode 100644
index 0000000..5ea9dff
--- /dev/null
+++ b/day18/input.txt
@@ -0,0 +1,2165 @@
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diff --git a/day18/solution.nim b/day18/solution.nim
new file mode 100644
index 0000000..0ef81fb
--- /dev/null
+++ b/day18/solution.nim
@@ -0,0 +1,83 @@
+import strutils
+import sequtils
+import sugar
+import sets
+
+type Cube = tuple
+  x, y, z: int
+
+proc parseLine(line: string): Cube =
+  let tokens = map(line.split(","), (e) => e.parseInt())
+  (tokens[0], tokens[1], tokens[2])
+
+proc parseFile(content: string): seq[Cube] =
+  let lines = content.strip().splitLines()
+  result = map(lines, parseLine)
+
+proc nextTo(A, B: Cube): bool =
+  let
+    dx = abs(A.x - B.x)
+    dy = abs(A.y - B.y)
+    dz = abs(A.z - B.z)
+
+  dx + dy + dz <= 1 and dx <= 1 and dy <= 1 and dz <= 1
+
+proc part1(cubes: seq[Cube]): int =
+  result = 6 * cubes.len()
+  for i, cube in cubes[0 .. ^2]:
+    for other in cubes[i+1 .. ^1]:
+      if cube.nextTo(other):
+        result -= 2
+
+var
+  solid: HashSet[Cube]
+  visited: HashSet[Cube]
+  maxn = 0
+  minn = -1
+
+proc blocksAround(cube: Cube): int =
+  for x in [cube.x-1, cube.x+1]:
+    if (x, cube.y, cube.z) in solid:
+      result += 1
+
+  for y in [cube.y-1, cube.y+1]:
+    if (cube.x, y, cube.z) in solid:
+      result += 1
+
+  for z in [cube.z-1, cube.z+1]:
+    if (cube.x, cube.y, z) in solid:
+      result += 1
+
+proc dfs(curr: Cube): int =
+  let maxp = max([curr.x, curr.y, curr.z])
+  let minp = min([curr.x, curr.y, curr.z])
+  if minp < minn or maxp >= maxn or visited.containsOrIncl(curr):
+    return 0
+
+  # if is air block
+  if curr notin solid:
+    result = blocksAround(curr) +
+      dfs((curr.x+1, curr.y, curr.z)) +
+      dfs((curr.x-1, curr.y, curr.z)) +
+      dfs((curr.x, curr.y+1, curr.z)) +
+      dfs((curr.x, curr.y-1, curr.z)) +
+      dfs((curr.x, curr.y, curr.z+1)) +
+      dfs((curr.x, curr.y, curr.z-1))
+
+
+proc part2(cubes: seq[Cube]): int =
+  # echo cubes
+  for cube in cubes:
+    maxn = max([cube.x, cube.y, cube.z])
+  maxn += 6
+
+  for cube in cubes:
+    solid.incl(cube)
+
+  result = dfs((0,0,0))
+
+let content = readFile("./input.txt")
+let input = parseFile(content)
+
+echo part1(input)
+echo part2(input)