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57 lines
1011 B
Python
Executable File
57 lines
1011 B
Python
Executable File
#!/usr/bin/python
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import fileinput
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import re
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def read_action(it):
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to_write = 1 if "1" in next(it) else 0
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offset = 1 if "right" in next(it) else -1
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goto = next(it).strip()[-2]
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return (to_write, offset, goto)
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def read_input():
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in_iter = fileinput.input()
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initial = next(in_iter).strip()[-2]
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runs = int(next(in_iter).split(" ")[-2])
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states = {}
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for line in in_iter:
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line = line.strip()
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if not line:
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continue
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state = line[-2]
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next(in_iter)
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if_0 = read_action(in_iter)
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next(in_iter)
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if_1 = read_action(in_iter)
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states[state] = (if_0, if_1)
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return initial, runs, states
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state, steps, states = read_input()
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ones = set()
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pos = 0
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for _ in range(steps):
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if pos in ones:
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instr = states[state][1]
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else:
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instr = states[state][0]
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if instr[0] == 1:
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ones.add(pos)
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else:
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ones.discard(pos)
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pos += instr[1]
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state = instr[2]
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print(len(ones))
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