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day11.py
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day11.py
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import copy
def part1():
inp_f = open("input/day11.txt", "r")
inp = inp_f.read()
inp_list = [list(line) for line in inp.split("\n") if line != ""]
while True:
changed = False
new_setup = copy.deepcopy(inp_list)
for row in range(len(inp_list)):
for col in range(len(inp_list[0])):
if inp_list[row][col] == "L":
if row != 0 and inp_list[row-1][col] == "#":
continue
if row != len(inp_list)-1 and inp_list[row+1][col] == "#":
continue
if col != 0 and inp_list[row][col-1] == "#":
continue
if col != len(inp_list[0])-1 and inp_list[row][col+1] == "#":
continue
if row != 0 and col != 0 and inp_list[row-1][col-1] == "#":
continue
if row != 0 and col != len(inp_list[0])-1 and inp_list[row-1][col+1] == "#":
continue
if row != len(inp_list)-1 and col != 0 and inp_list[row+1][col-1] == "#":
continue
if row != len(inp_list)-1 and col != len(inp_list[0])-1 and inp_list[row+1][col+1] == "#":
continue
new_setup[row][col] = "#"
changed = True
elif inp_list[row][col] == "#":
num_occupied = 0
if row != 0 and inp_list[row-1][col] == "#":
num_occupied += 1
if row != len(inp_list)-1 and inp_list[row+1][col] == "#":
num_occupied += 1
if col != 0 and inp_list[row][col-1] == "#":
num_occupied += 1
if col != len(inp_list[0])-1 and inp_list[row][col+1] == "#":
num_occupied += 1
if row != 0 and col != 0 and inp_list[row-1][col-1] == "#":
num_occupied += 1
if row != 0 and col != len(inp_list[0])-1 and inp_list[row-1][col+1] == "#":
num_occupied += 1
if row != len(inp_list)-1 and col != 0 and inp_list[row+1][col-1] == "#":
num_occupied += 1
if row != len(inp_list)-1 and col != len(inp_list[0])-1 and inp_list[row+1][col+1] == "#":
num_occupied += 1
if num_occupied >= 4:
new_setup[row][col] = "L"
changed = True
if not changed:
break
inp_list = new_setup
return sum([list1.count("#") for list1 in inp_list])
def count_spot(row, col, setup):
num_occupied = 0
# count upper left diag
row_pos = row
col_pos = col
while row_pos > 0 and col_pos > 0:
row_pos -= 1
col_pos -= 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
num_occupied += 1
break
# count lower left diag
row_pos = row
col_pos = col
while row_pos < len(setup)-1 and col_pos > 0:
row_pos += 1
col_pos -= 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
num_occupied += 1
break
# count upper right diag
row_pos = row
col_pos = col
while row_pos > 0 and col_pos < len(setup[0])-1:
row_pos -= 1
col_pos += 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
num_occupied += 1
break
# count lower right diag
row_pos = row
col_pos = col
while row_pos < len(setup)-1 and col_pos < len(setup[0])-1:
row_pos += 1
col_pos += 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
num_occupied += 1
break
# count up
row_pos = row
while row_pos > 0:
row_pos -= 1
if setup[row_pos][col] == "L":
break
if setup[row_pos][col] == "#":
num_occupied += 1
break
# count down
row_pos = row
while row_pos < len(setup)-1:
row_pos += 1
if setup[row_pos][col] == "L":
break
if setup[row_pos][col] == "#":
num_occupied += 1
break
# count left
col_pos = col
while col_pos > 0:
col_pos -= 1
if setup[row][col_pos] == "L":
break
if setup[row][col_pos] == "#":
num_occupied += 1
break
# count right
col_pos = col
while col_pos < len(setup[0])-1:
col_pos += 1
if setup[row][col_pos] == "L":
break
if setup[row][col_pos] == "#":
num_occupied += 1
break
return num_occupied
# return True if none occupied, False if found occupied
def count_spot_bool(row, col, setup):
num_occupied = 0
# count upper left diag
row_pos = row
col_pos = col
while row_pos > 0 and col_pos > 0:
row_pos -= 1
col_pos -= 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
return False
# count lower left diag
row_pos = row
col_pos = col
while row_pos < len(setup)-1 and col_pos > 0:
row_pos += 1
col_pos -= 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
return False
# count upper right diag
row_pos = row
col_pos = col
while row_pos > 0 and col_pos < len(setup[0])-1:
row_pos -= 1
col_pos += 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
return False
# count lower right diag
row_pos = row
col_pos = col
while row_pos < len(setup)-1 and col_pos < len(setup[0])-1:
row_pos += 1
col_pos += 1
if setup[row_pos][col_pos] == "L":
break
if setup[row_pos][col_pos] == "#":
return False
# count up
row_pos = row
while row_pos > 0:
row_pos -= 1
if setup[row_pos][col] == "L":
break
if setup[row_pos][col] == "#":
return False
# count down
row_pos = row
while row_pos < len(setup)-1:
row_pos += 1
if setup[row_pos][col] == "L":
break
if setup[row_pos][col] == "#":
return False
# count left
col_pos = col
while col_pos > 0:
col_pos -= 1
if setup[row][col_pos] == "L":
break
if setup[row][col_pos] == "#":
return False
# count right
col_pos = col
while col_pos < len(setup[0])-1:
col_pos += 1
if setup[row][col_pos] == "L":
break
if setup[row][col_pos] == "#":
return False
return True
def part2():
inp_f = open("input/day11.txt", "r")
inp = inp_f.read()
inp_list = [list(line) for line in inp.split("\n") if line != ""]
while True:
changed = False
new_setup = copy.deepcopy(inp_list)
for row in range(len(inp_list)):
for col in range(len(inp_list[0])):
if inp_list[row][col] == "L":
if count_spot_bool(row, col, inp_list):
new_setup[row][col] = "#"
changed = True
elif inp_list[row][col] == "#":
if count_spot(row, col, inp_list) >= 5:
new_setup[row][col] = "L"
changed = True
if not changed:
break
inp_list = new_setup
return sum([list1.count("#") for list1 in inp_list])
if __name__ == "__main__":
# print(part1())
print(part2())