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2024(6): this is an improvement

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On to 2024(7)!
This commit is contained in:
Kees van Kempen
2024-12-28 23:44:18 +01:00
parent 242bacd75d
commit 183b4428f7
1 changed files with 37 additions and 36 deletions
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73
2024/06/part2.py
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@ -2,6 +2,7 @@ from part1 import *
verbose = False
sssst = True
thoughts = \
"""
@ -17,59 +18,59 @@ then travelled to that position at least twice from at least one
position; see Pigeonhole principle).
"""
#map_to_load = "testinput"
map_to_load = "input"
if __name__ == "__main__":
m = Map()
#m.load_map("testinput")
m.load_map("input")
m.load_map(map_to_load)
# Prepare forked map for speed
#forked_map = m.copy()
forked_map = m.copy()
#forked_map = Map()
#forked_map.load_map("input")
#forked_map.load_map("testinput")
#begin_pos = m.pos
#begin_direction = m.direction
#forked_map.load_map(map_to_load)
begin_pos = m.pos
begin_direction = m.direction
trace = [m.pos]
while m.step():
trace.append(m.pos)
#print(trace)
loop_obstacles = []
i = 0
while m.step():
#print(i)
for i in range(1, len(trace)):
pos, next_pos = trace[i - 1], trace[i]
if not forked_map.pos_in_map(next_pos):
continue
if verbose:
print(m.pos, m.direction)
# Create a copy
#forked_map = m.copy()
forked_map = Map()
#forked_map.load_map("testinput")
forked_map.load_map("input")
#forked_map.map = m.map.copy()
#print(f"Forking map, setting obstacle at {m.next_pos()}, resetting current {m.pos} to {m.map[m.pos]}")
#forked_map.show()
next_pos = m.next_pos()
if next_pos in loop_obstacles or not forked_map.pos_in_map(next_pos):
print(f"Skip forking at {next_pos} as already in loop_obstacles or last.")
continue
# Setup the fork
forked_map.map[next_pos] = Map.Tiles.OBSTACLE.value
#forked_map.map[m.pos] = m.map[m.pos]
#forked_map.pos = begin_pos
#forked_map.direction = begin_direction
#forked_map.trace = [begin_pos]
forked_map.map[pos] = m.map[pos]
forked_map.pos = begin_pos
forked_map.direction = begin_direction
forked_map.trace = [begin_pos]
forked_map.pos_counter *= 0
#print(forked_map.trace)
#forked_map.show()
print(f"Forking at {next_pos}... ", end="")
if not sssst:
print(f"Forking at {next_pos}... ", end="")
try:
while forked_map.step():
continue
except Map.LoopException:
print("loop.")
loop_obstacles.append(m.next_pos())
if not sssst:
print("loop.")
loop_obstacles.append(next_pos)
#print(forked_map.trace)
#forked_map.show()
else:
print("no loop.")
i += 1
#if i > 100:
# break
#m.show()
#print(len(m.trace), m.trace)
#print(len(set(m.trace)))
if not sssst:
print("no loop.")
#print(forked_map.trace)
#forked_map.show()
print(len(set(loop_obstacles)))