43 lines
1.0 KiB
Python
43 lines
1.0 KiB
Python
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#/usr/bin/env python
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from collections import defaultdict
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import re
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RE_MOVE = re.compile(r"^move (\d+) from (\d+) to (\d+)$")
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def read_cargo(f):
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cargo = defaultdict(list)
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for line in f:
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line = line.rstrip()
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if len(line) == 0:
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break
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pos = 1
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while (pos-1)*4+1 < len(line):
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c = line[(pos-1)*4+1]
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if c == ' ':
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pos += 1
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continue
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cargo[pos].append(c)
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pos += 1
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return cargo
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def read_moves(f):
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for line in f:
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line = line.strip()
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m = RE_MOVE.match(line)
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if not m:
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continue
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yield (int(m.group(1)), int(m.group(2)), int(m.group(3)))
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with open("input.txt", "r") as f:
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cargo = read_cargo(f)
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for move in read_moves(f):
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slice = cargo[move[1]][:move[0]]
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slice.reverse()
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cargo[move[1]] = cargo[move[1]][move[0]:]
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cargo[move[2]] = slice + cargo[move[2]]
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for k in sorted(cargo.keys()):
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print(cargo[k][0], end ="")
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print()
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