59 lines
1.2 KiB
Python
59 lines
1.2 KiB
Python
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from time import time
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def reverse(text, repeat):
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knot = list(range(256))
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pos = 0
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skip = 0
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for isntevenused in range(repeat):
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for i in text:
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temp = []
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for j in range(i):
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temp.append(knot[(pos+j) % 256])
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for j in range(i):
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knot[(pos+i-1-j) % 256] = temp[j]
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pos += skip + i
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skip += 1
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return knot
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def dense(knot):
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dense = [0]*16
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for i in range(16):
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dense[i] = knot[16*i]
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for m in range(1, 16):
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dense[i] ^= knot[16*i+m]
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return dense
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def kh(dense):
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knothash = ''
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for i in dense:
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if len(hex(i)[2:]) == 2:
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knothash += hex(i)[2:]
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else:
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knothash += '0' + hex(i)[2:]
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return knothash
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start = time()
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inp = '102,255,99,252,200,24,219,57,103,2,226,254,1,0,69,216'
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text = [102,255,99,252,200,24,219,57,103,2,226,254,1,0,69,216]
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text2 = []
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for i in range(len(inp)):
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text2.append(ord(inp[i]))
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text2 += [17, 31, 73, 47, 23]
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knot = reverse(text, 1)
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sparce = reverse(text2, 64)
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dense = dense(sparce)
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knothash = kh(dense)
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print('Part One: ' + str(knot[0]*knot[1]))
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print('Part Two: ' + knothash)
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print('Completed in ' + str(time() - start) + ' seconds.')
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