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Solution to Day 14: Disk Defragmentation
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#aoc_d14.py | |
def knot_hash(inputstr): | |
skip_size = 0 | |
inp = range(0,256) | |
ind = 0 | |
for i in range(0,64): | |
lengths = [ord(c) for c in inputstr] | |
add = [17, 31, 73, 47, 23] | |
lengths = lengths + add | |
#print lengths | |
for l in lengths: | |
w = [] | |
for i in range(ind,ind+l): | |
w.append(inp[i%len(inp)]) | |
rev = w[::-1] | |
o = {} | |
for i in range(ind,ind+l): | |
o[i%len(inp)] = rev[i-ind] | |
n = [None]*len(inp) | |
for i in range(0,len(inp)): | |
if i in o: | |
n[i]= o[i] | |
else: | |
n[i] = inp[i] | |
inp = n | |
ind = (ind + (l + skip_size)) % len(inp) | |
skip_size += 1 | |
res = '' | |
for i in range(0,16): | |
w = inp[i*16:(i+1)*16] | |
z = w[0] | |
for r in range(1,len(w)): | |
z = z ^ w[r] | |
res += '{:02x}'.format(z) | |
return res | |
sum_bits = 0 | |
for i in range(128): | |
r = knot_hash("stpzcrnm-"+str(i)) | |
sum_bits += bin(int(r,16)).count("1") | |
print i,r, sum_bits |
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