ps/aoc2020
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

a faster solution, ca 1:30 minut to 10 seconds

Browse source
This commit is contained in:
Juan José Gutiérrez de Quevedo Pérez 2020-12-11 14:52:29 +01:00
parent 3ace709714
commit 9443543a77
1 changed files with 45 additions and 36 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

81
11/2.py
View file

@ -1,12 +1,4 @@
def first_of(haystack, needles):
element = len(haystack) - 1
for needle in needles:
if needle in haystack:
element = min(haystack.index(needle), element)
return haystack[element] if haystack else ""
def count_adjacent(grid, line, seat):
adjs = []
h = len(grid) - 1
w = len(grid[0]) - 1
# generate lists
@ -16,65 +8,85 @@ def count_adjacent(grid, line, seat):
# D3 V2 D4
#
# vertical lists
v1 = []
adj = 0
if line > 0:
for x in range(line - 1, -1, -1):
v1.append(grid[x][seat])
if grid[x][seat] == "#":
adj += 1
break
if grid[x][seat] == "L":
break
v2 = []
if line < w:
for x in range(line + 1, len(grid)):
v2.append(grid[x][seat])
if grid[x][seat] == "#":
adj += 1
break
if grid[x][seat] == "L":
break
# horizontal lists
h1 = []
if seat > 0:
h1 = grid[line][seat - 1::-1]
h2 = grid[line][seat+1:]
for s in range(seat - 1, -1, -1):
if grid[line][s] == "#":
adj += 1
break
if grid[line][s] == "L":
break
for s in range(seat + 1, w+1):
if grid[line][s] == "#":
adj += 1
break
if grid[line][s] == "L":
break
# diagonal lists
d1 = []
s = seat - 1
l = line - 1
for __ in range(min(line, seat)):
d1.append(grid[l][s])
if grid[l][s] == "#":
adj += 1
break
if grid[l][s] == "L":
break
l -=1
s -=1
d2 = []
s = seat + 1
l = line - 1
for __ in range(min(line, w - seat)):
d2.append(grid[l][s])
if grid[l][s] == "#":
adj += 1
break
if grid[l][s] == "L":
break
l -=1
s +=1
d3 = []
s = seat - 1
l = line + 1
for __ in range(min(h - line, seat)):
d3.append(grid[l][s])
if grid[l][s] == "#":
adj += 1
break
if grid[l][s] == "L":
break
l +=1
s -=1
d4 = []
s = seat + 1
l = line + 1
for __ in range(min(h - line, w - seat)):
d4.append(grid[l][s])
if grid[l][s] == "#":
adj += 1
break
if grid[l][s] == "L":
break
l +=1
s +=1
adjs.append(first_of(v1, ["#", "L"]))
adjs.append(first_of(v2, ["#", "L"]))
adjs.append(first_of(h1, ["#", "L"]))
adjs.append(first_of(h2, ["#", "L"]))
adjs.append(first_of(d1, ["#", "L"]))
adjs.append(first_of(d2, ["#", "L"]))
adjs.append(first_of(d3, ["#", "L"]))
adjs.append(first_of(d4, ["#", "L"]))
return adjs.count("#")
return adj
with open("input") as f:
content = [[y for y in x.strip()] for x in f]
@ -88,7 +100,6 @@ changes = 1
iterations = 0
while changes > 0:
iterations += 1
# print(".", end="", flush=True)
last = []
for line in new:
last.append(line.copy())
@ -106,8 +117,6 @@ while changes > 0:
new[line][seat] = "L"
changes += 1
# print("".join(adjs), "".join(new[line]))
# for line in new:
# print("".join(line))
#for line in new:
# print("".join(line))