aoc2021/d09/d09_2.py

39 lines
803 B
Python
Raw Normal View History

2021-12-09 22:55:58 +00:00
import sys
L = list(map(lambda s: [9]+list(map(int, s))+[9] ,sys.stdin.read().splitlines()))
W = len(L[0])
L = [[9]*W] + L + [[9]*W]
H = len(L)
def printgrid():
for row in L:
print("".join(map(str,row)))
def neigh(x,y,C=0,V=set()):
p = L[x][y]
if p<9:
V.add((x,y))
C+=1
#print(' '*C, x,y,"p="+str(p), C)
for (i,j) in [(0,1),(1,0),(-1,0),(0,-1)]:
if L[x+i][y+j]>p and (x+i,y+j) not in V:
C=neigh(x+i,y+j,C,V)
return C
else:
#print(' '*C, x,y,"p="+str(p), C)
return C
printgrid()
S = []
for x in range(1,H-1):
for y in range(1,W-1):
p = L[x][y]
n = L[x-1][y]
s = L[x+1][y]
e = L[x][y-1]
w = L[x][y+1]
islow =all([p<n,p<s,p<e,p<w])
#print(x,y,p,n,s,e,w)
if islow:
print(x,y,p, "is low")
S.append(neigh(x,y))
print(S)
S = sorted(S)
print(S[-1]*S[-2]*S[-3])