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15.py
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15.py
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from lib import *
input = read_input(2018, 15)
lines = input.splitlines()
def adj(x, y):
return [(x, y - 1), (x - 1, y), (x + 1, y), (x, y + 1)]
entities = {}
walls = set()
idx = 0
for i, line in enumerate(lines):
for j, c in enumerate(line):
if c == "#":
walls.add((j, i))
elif c != ".":
entities[(j, i)] = (idx, c == "E", 200)
idx += 1
rnd = 0
while True:
done = False
orig = entities.copy()
for x, y in sorted(entities, key=lambda a: a[::-1]):
if (x, y) not in entities:
continue
idx, elf, hp = entities[(x, y)]
if idx != orig[(x, y)][0]:
continue
if not any(q[1] != elf for q in entities.values()):
done = True
break
in_range = [(p, q) for p in adj(x, y) if (q := entities.get(p)) and q[1] != elf]
if not in_range:
queue = [(0, x, y)]
visited = set()
dist = None
nearest = []
while queue:
d, p, q = queue.pop(0)
if (p, q) in visited:
continue
visited.add((p, q))
if any(e[1] != elf for r in adj(p, q) if (e := entities.get(r))):
if dist is None:
dist = d
elif d > dist:
break
nearest.append((p, q))
for r in adj(p, q):
if r in walls:
continue
if (e := entities.get(r)) and e[1] == elf:
continue
queue.append((d + 1, *r))
if not nearest:
continue
target = min(nearest, key=lambda a: a[::-1])
queue = [(0, *target)]
visited = set()
dist = None
nearest = []
while queue:
d, p, q = queue.pop(0)
if (p, q) in visited:
continue
visited.add((p, q))
if (x, y) in adj(p, q):
if dist is None:
dist = d
elif d > dist:
break
nearest.append((p, q))
for r in adj(p, q):
if r in walls:
continue
if (e := entities.get(r)) and e[1] == elf:
continue
queue.append((d + 1, *r))
if not nearest:
continue
g = min(nearest, key=lambda a: a[::-1])
entities[g] = entities.pop((x, y))
x, y = g
in_range = [(p, q) for p in adj(x, y) if (q := entities.get(p)) and q[1] != elf]
if in_range:
in_range.sort(key=lambda a: (a[1][2], a[0][::-1]))
p, (idx2, elf2, hp2) = in_range[0]
hp2 -= 3
if hp2 <= 0:
entities.pop(p)
else:
entities[p] = idx2, elf2, hp2
if done:
break
rnd += 1
print(rnd * sum(e[2] for e in entities.values()))
def simulate(ap):
entities = {}
walls = set()
idx = 0
for i, line in enumerate(lines):
for j, c in enumerate(line):
if c == "#":
walls.add((j, i))
elif c != ".":
entities[(j, i)] = (idx, c == "E", 200)
idx += 1
rnd = 0
while True:
done = False
orig = entities.copy()
for x, y in sorted(entities, key=lambda a: a[::-1]):
if (x, y) not in entities:
continue
idx, elf, hp = entities[(x, y)]
if idx != orig[(x, y)][0]:
continue
if not any(q[1] != elf for q in entities.values()):
done = True
break
in_range = [(p, q) for p in adj(x, y) if (q := entities.get(p)) and q[1] != elf]
if not in_range:
queue = [(0, x, y)]
visited = set()
dist = None
nearest = []
while queue:
d, p, q = queue.pop(0)
if (p, q) in visited:
continue
visited.add((p, q))
if any(e[1] != elf for r in adj(p, q) if (e := entities.get(r))):
if dist is None:
dist = d
elif d > dist:
break
nearest.append((p, q))
for r in adj(p, q):
if r in walls:
continue
if (e := entities.get(r)) and e[1] == elf:
continue
queue.append((d + 1, *r))
if not nearest:
continue
target = min(nearest, key=lambda a: a[::-1])
queue = [(0, *target)]
visited = set()
dist = None
nearest = []
while queue:
d, p, q = queue.pop(0)
if (p, q) in visited:
continue
visited.add((p, q))
if (x, y) in adj(p, q):
if dist is None:
dist = d
elif d > dist:
break
nearest.append((p, q))
for r in adj(p, q):
if r in walls:
continue
if (e := entities.get(r)) and e[1] == elf:
continue
queue.append((d + 1, *r))
if not nearest:
continue
g = min(nearest, key=lambda a: a[::-1])
entities[g] = entities.pop((x, y))
x, y = g
in_range = [(p, q) for p in adj(x, y) if (q := entities.get(p)) and q[1] != elf]
if in_range:
in_range.sort(key=lambda a: (a[1][2], a[0][::-1]))
p, (idx2, elf2, hp2) = in_range[0]
hp2 -= ap if elf else 3
if hp2 <= 0:
if elf2:
return -1
entities.pop(p)
else:
entities[p] = idx2, elf2, hp2
if done:
break
rnd += 1
return rnd * sum(e[2] for e in entities.values())
ap = 4
while (res := simulate(ap)) < 0:
ap += 1
print(res)