48 lines
1,015 B
Python
48 lines
1,015 B
Python
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import os
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import sys
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from collections import defaultdict
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def hash(s):
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v = 0
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for c in s:
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if c == ",":
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continue
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v += ord(c)
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v *= 17
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v %= 256
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return v
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with open(sys.argv[1]) as f:
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s = f.read().strip()
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boxes = defaultdict(list)
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part1 = 0
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for s_ in s.split(","):
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part1 += hash(s_)
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if s_[-1] == "-":
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label = s_[:-1]
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h = hash(label)
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for i in range(len(boxes[h])):
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if boxes[h][i][0] == label:
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del boxes[h][i]
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break
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elif s_[-2] == "=":
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label = s_[:-2]
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focal = int(s_[-1])
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h = hash(label)
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for i in range(len(boxes[h])):
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if boxes[h][i][0] == label:
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boxes[h][i] = (label, focal)
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break
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else:
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boxes[h].append((label, focal))
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part2 = 0
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for (box_i, box) in boxes.items():
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for (slot, (_, focal)) in enumerate(box):
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part2 += (box_i + 1) * (slot + 1) * focal
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print(part1, part2)
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