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day16-2.py

@@ -1,11 +1,13 @@
 import queue
 
-q = queue.Queue()
+MAX_STEPS = 26
+
+q = queue.PriorityQueue()
 valves = {}
 valvesConsider = {}
-destinationQue = queue.Queue()
-shortest = None
 distanceMap = {}
+eliminated = {}
+numTotalSteps = 0
 
 class Valve():
     def __init__(self, flowRate, tunnels, name):
@@ -16,25 +18,71 @@ class Valve():
     def getFlowrate(self):
         return self.flowRate
 
-    def moves(self, destination, length):
-        global shortest
-        if shortest is not None and length >= shortest:
-            return
-        if self.name == destination:
-            if shortest is None or length <= shortest:
-                shortest = length
-                return
-        _length = length + 1
-        for val in self.tunnels:
-            destinationQue.put((val, destination, _length))
+    def genDistanceMap(self):
+        nextValves = queue.PriorityQueue()
+        nextValves.put((0, self))
+
+        distanceMap[(self.name, self.name)] = 0
+
+        while not nextValves.empty():
+            curDist, valve = nextValves.get()
+
+            for tunnel in valve.tunnels:
+                if (self.name, tunnel) in distanceMap:
+                    continue
+
+                nextValve = valves[tunnel]
+                nextDist = curDist + 1
+
+                distanceMap[(self.name, nextValve.name)] = nextDist
+                nextValves.put((nextDist, nextValve))
+
+    def __lt__(self, other):
+        return self.flowRate < other.flowRate and self.name < other.name
+
+
+def maxRemaining(remainingTime, possibleValves):
+    nextSteps = [2 * x for x in range(int(remainingTime / 2) + 1)]
+
+    allValveValues = list(reversed([v for _, v in possibleValves.items()]))
+    possibleRemaining = 0
+
+    for timeOffset in nextSteps:
+        if timeOffset > remainingTime:
+            break
+
+        if len(allValveValues) == 0:
+            break
+
+        openFor = remainingTime - timeOffset
+        possibleRemaining += allValveValues[0] * (remainingTime - timeOffset)
+        allValveValues = allValveValues[1:]
+
+        if len(allValveValues) == 0:
+            break
+
+        possibleRemaining += allValveValues[0] * (remainingTime - timeOffset)
+        allValveValues = allValveValues[1:]
+
+    return possibleRemaining
 
 
 
 def step(position1, position2, busy1, busy2, currentTime, pressure, _valvesCons):
     global curentbest
+    global numTotalSteps
+    global maxRemaining
+
+    numTotalSteps += 1
+
+    if maxRemaining(MAX_STEPS - currentTime, _valvesCons) + pressure < curentbest:
+        # There's no way we can get better than the current max pressure, so bail.
+        eliminated.setdefault('maxRemaining', 0)
+        eliminated['maxRemaining'] += 1
+        return
+
     done = False
     if pressure > curentbest:
-        print(1)
         curentbest = pressure
     if len(_valvesCons) == 0:
         return
@@ -42,47 +90,45 @@ def step(position1, position2, busy1, busy2, currentTime, pressure, _valvesCons)
         for destination in _valvesCons:
             _CopyCons = _valvesCons.copy()
             _dist = distanceMap[(position1, destination)]
-            if (currentTime + _dist + 1) >= 26:
+            if (currentTime + _dist + 1) >= MAX_STEPS:
                 continue
-            _busy1 =_dist + 1
-            _pressure = pressure + ((26 - currentTime - _busy1)* _CopyCons[destination])
+            _busy1 = _dist + 1
+            _pressure = pressure + ((MAX_STEPS - currentTime - _busy1) * _CopyCons[destination])
             _CopyCons.pop(destination)
             done = True
-            q.put((destination, position2, _busy1, busy2, currentTime, _pressure, _CopyCons))
+            q.put((_pressure * -1, destination, position2, _busy1, busy2, currentTime, _CopyCons))
         if done:
             return
     if busy2 == 0:
         for destination in _valvesCons:
             _CopyCons = _valvesCons.copy()
             _dist = distanceMap[(position2, destination)]
-            if (currentTime + _dist + 1) >= 26:
+            if (currentTime + _dist + 1) >= MAX_STEPS:
                 continue
             _busy2 =_dist + 1
-            _pressure = pressure + ((26 - currentTime - _busy2)* _CopyCons[destination])
+            _pressure = pressure + ((MAX_STEPS - currentTime - _busy2)* _CopyCons[destination])
             _CopyCons.pop(destination)
-            q.put((position1, destination, busy1, _busy2, currentTime, _pressure, _CopyCons))
+            done = True
+            q.put((_pressure * -1, position1, destination, busy1, _busy2, currentTime, _CopyCons))
+        if done:
+            return
+    if busy1 <= 0 and busy2 <= 0:
         return
-    _currentTime = currentTime + 1
-    _busy1 = busy1 - 1
-    _busy2 = busy2 - 1
+    elif busy2 == 0:
+        idle = busy1
+    elif busy1 == 0: 
+        idle = busy2
+    else:
+        idle = min(busy1, busy2)
+    _currentTime = currentTime + idle
+    _busy1 = busy1 - idle
+    _busy2 = busy2 - idle
     _CopyCons = _valvesCons.copy()
-    if _currentTime >= 26:
+    if _currentTime >= MAX_STEPS:
         return
-    q.put((position1, position2, _busy1, _busy2, _currentTime, pressure, _CopyCons))
-    
-    
+    q.put((pressure * -1, position1, position2, _busy1, _busy2, _currentTime, _CopyCons))
 
 
-def distance(position, destination):
-    global destinationQue
-    global shortest
-    shortest = None
-    destinationQue.put((position, destination, 0))
-    while not destinationQue.empty():
-        _position, _destination, length = destinationQue.get()
-        valves[_position].moves(_destination, length)
-    return shortest
-
 openvalves = []
 
 
@@ -103,21 +149,8 @@ for line in inp:
     newValve = Valve( flowRate, tunnels, _valve)
     valves[_valve] = newValve
 
-n = 0
-
-for start in valvesConsider:
-    n += 1
-    distanceMap[('AA', start)] = distance('AA', start)
-    print(n)
-    for end in valvesConsider:
-        if (start, end) in distanceMap:
-            continue
-        n += 1
-        _dist = distance(start, end)
-        distanceMap[(start, end)] = _dist
-        distanceMap[(end, start)] = _dist
-        print(n)
-    
+for _, valve in valves.items():
+    valve.genDistanceMap()
 
 for i in distanceMap:
     print(i, distanceMap[i])
@@ -126,12 +159,13 @@ position = 'AA'
 currentTime = 0
 pressure = 0
 curentbest = 0
-q.put((position, position, 0, 0, currentTime, pressure, valvesConsider))
+q.put((pressure, position, position, 0, 0, currentTime, valvesConsider))
 
 while not q.empty():
-    print(q.qsize())
-    position1, position2, busy1, busy2, currentTime, pressure, _valvesConsider = q.get()
-    step(position1, position2, busy1, busy2, currentTime, pressure, _valvesConsider)
+    #print(q.qsize())
+    pressure, position1, position2, busy1, busy2, currentTime, _valvesConsider = q.get()
+    # print(q.qsize(), pressure, position1, position2, busy1, busy2, currentTime, numTotalSteps, eliminated)
+    step(position1, position2, busy1, busy2, currentTime, pressure * -1, _valvesConsider)
 
 
 print(curentbest)

day16-2take2.py

@@ -1,11 +1,23 @@
 import queue
 
-q = queue.Queue()
+MAX_STEPS = 26
+
+q = queue.PriorityQueue()
 valves = {}
 valvesConsider = {}
-destinationQue = queue.Queue()
-shortest = None
 distanceMap = {}
+visited = {}
+this_is_n = 0
+
+def print_every_n(*args):
+    global this_is_n
+
+    if this_is_n >= 10000:
+        this_is_n = 0
+        print(*args)
+
+    this_is_n += 1
+
 
 class Valve():
     def __init__(self, flowRate, tunnels, name):
@@ -16,42 +28,64 @@ class Valve():
     def getFlowrate(self):
         return self.flowRate
 
-    def moves(self, destination, length):
-        global shortest
-        if shortest is not None and length >= shortest:
-            return
-        if self.name == destination:
-            if shortest is None or length <= shortest:
-                shortest = length
-                return
-        _length = length + 1
-        for val in self.tunnels:
-            destinationQue.put((val, destination, _length))
+    def genDistanceMap(self):
+        nextValves = queue.PriorityQueue()
+        nextValves.put((0, self))
+
+        distanceMap[(self.name, self.name)] = 0
+
+        while not nextValves.empty():
+            curDist, valve = nextValves.get()
 
+            for tunnel in valve.tunnels:
+                if (self.name, tunnel) in distanceMap:
+                    continue
 
+                nextValve = valves[tunnel]
+                nextDist = curDist + 1
 
-def step(position, currentTime, pressure, _valvesCons, elephant):
+                distanceMap[(self.name, nextValve.name)] = nextDist
+                nextValves.put((nextDist, nextValve))
+
+    def __lt__(self, other):
+        return self.flowRate < other.flowRate and self.name < other.name
+
+
+def step(position, currentTime, pressure, _valvesCons, elephant, path):
     global curentbest
     _pos = position
     best = None
+    if tuple(path) in visited:
+        return
+    visited[tuple(path)] = 1
     for destination in _valvesCons:
         _elephant = elephant
         _openvalves = _valvesCons.copy()
         dist = distanceMap[(_pos, destination)]
-        value = (26 - currentTime - dist - 1) * _openvalves[destination]
+        value = (MAX_STEPS - currentTime - dist - 1) * _openvalves[destination]
         best = (destination, value , dist)
         _time = currentTime + best[2] + 1
-        if _time >= 26:
+        if _time >= MAX_STEPS:
             if _elephant:
                 continue
-            q.put(('AA', 0, pressure, _openvalves, True))
+            _path = path.copy()
+            _path.append('AA')
+            q.put(pressure* -1,('AA', 0, pressure, _openvalves, True, _path))
             continue
         _pressure = pressure + best[1]
         _position = best[0]
         _openvalves.pop(destination)
-        q.put((_position, _time, _pressure, _openvalves, elephant))
+        _path = path.copy()
+        _path.append(destination)
+        q.put(_pressure * -1,(_position, _time, _pressure, _openvalves, elephant, _path))
     if pressure > curentbest:
         curentbest = pressure
+    _openvalves = _valvesCons.copy()
+
+    if not elephant:
+        _path = path.copy()
+        _path.append('AA')
+        q.put(pressure*-1 ,('AA', 0, pressure, _openvalves, True, _path))
     
 
 def distance(position, destination):
@@ -67,7 +101,7 @@ def distance(position, destination):
 openvalves = []
 
 
-with open('in.txt','r') as f:
+with open('input16.txt','r') as f:
     inp = f.read().splitlines(keepends=False)
 
 for line in inp:
@@ -84,21 +118,8 @@ for line in inp:
     newValve = Valve( flowRate, tunnels, _valve)
     valves[_valve] = newValve
 
-n = 0
-
-for start in valvesConsider:
-    n += 1
-    distanceMap[('AA', start)] = distance('AA', start)
-    print(n)
-    for end in valvesConsider:
-        if (start, end) in distanceMap:
-            continue
-        n += 1
-        _dist = distance(start, end)
-        distanceMap[(start, end)] = _dist
-        distanceMap[(end, start)] = _dist
-        print(n)
-    
+for _, valve in valves.items():
+    valve.genDistanceMap()
 
 for i in distanceMap:
     print(i, distanceMap[i])
@@ -107,12 +128,12 @@ position = 'AA'
 currentTime = 0
 pressure = 0
 curentbest = 0
-q.put((position, currentTime, pressure, valvesConsider, False))
+q.put(0, (position, currentTime, pressure, valvesConsider, False, []))
 
 while not q.empty():
-    print(q.qsize())
-    position, currentTime, pressure, _valvesConsider, elephant = q.get()
-    step(position, currentTime, pressure, _valvesConsider, elephant)
+    print_every_n(q.qsize())
+    position, currentTime, pressure, _valvesConsider, elephant, path = q.get()
+    step(position, currentTime, pressure, _valvesConsider, elephant, path)
 
 
 print(curentbest)