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2024 day 14 part 2

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Thibaud Gasser
2025-01-04 14:13:48 +01:00
parent 42b5ef35b9
commit abb9d5ba1f
1 changed files with 25 additions and 7 deletions
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32
2024/day14/day14.py
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@@ -8,9 +8,10 @@ def parse_bots(lines):
return [lines[i:i+2] for i in range(0, len(lines), 2)] # [(pos, velocity), ...] return [lines[i:i+2] for i in range(0, len(lines), 2)] # [(pos, velocity), ...]
def simulate_bots(bots, grid_size, steps=100): def simulate_bots(bots, grid_size, steps=100, part2=False):
step = 0 step = 0
width, height = grid_size width, height = grid_size
stats = []
while step < steps: while step < steps:
new_bots = [] new_bots = []
for pos, velocity in bots: for pos, velocity in bots:
@@ -26,7 +27,13 @@ def simulate_bots(bots, grid_size, steps=100):
new_bots.append((pos, velocity)) new_bots.append((pos, velocity))
bots = new_bots bots = new_bots
step += 1 step += 1
return [pos for pos, _ in bots]
if part2:
# search step which maximizes safety value
safety = calculate_safety(Counter([p for p, _ in bots]), grid_size)
stats.append((safety, step))
return [pos for pos, _ in bots], stats
def determine_quadrant(pos, grid_size): def determine_quadrant(pos, grid_size):
@@ -43,23 +50,34 @@ def determine_quadrant(pos, grid_size):
return q return q
def part1(bots, grid_size): def calculate_safety(bots, grid_size):
bots = simulate_bots(bots, grid_size)
c = Counter(bots)
total_quadrants = [0, 0, 0, 0] total_quadrants = [0, 0, 0, 0]
for pos, count in c.items(): for pos, count in bots.items():
q = determine_quadrant(pos, grid_size) q = determine_quadrant(pos, grid_size)
if q is None: # ignore middle row and col if q is None: # ignore middle row and col
continue continue
total_quadrants[q] += count total_quadrants[q] += count
#print_grid(c, grid_size)
return prod(total_quadrants) return prod(total_quadrants)
def part1(bots, grid_size):
bots, _ = simulate_bots(bots, grid_size)
c = Counter(bots)
return calculate_safety(c, grid_size)
def part2(bots, grid_size):
max_step = grid_size[0] * grid_size[1] # input is periodic
_, stats = simulate_bots(bots, grid_size, max_step, part2=True)
return sorted(stats)[0][1]
def main(lines): def main(lines):
bots = parse_bots(lines) bots = parse_bots(lines)
total = part1(bots, grid_size) total = part1(bots, grid_size)
print("Part 1: ", total) print("Part 1: ", total)
p2 = part2(bots, grid_size)
print("Part 2: ", p2)
def print_grid(c, grid_size): def print_grid(c, grid_size):