Anders Englöf Ytterström
8aa6363b9f
Did brute force, but earlier drafts of the code failed to exit the while loop correcly. By manual testing, an odd number is required in reg a to set the first output to 0 (for my puzzle input at least). Hence, only odd numbers are tested.
77 lines
2 KiB
Python
77 lines
2 KiB
Python
def solve(data):
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p = data.splitlines()
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csl = 30
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A = "01" * (csl // 2)
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i = 1
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while True:
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if A == run(
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csl,
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p.copy(),
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{
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"a": i,
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"b": 0,
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"c": 0,
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"d": 0,
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},
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):
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break
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i += 2
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p1 = i
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return p1, None
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def run(lO, p, r):
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i = 0
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pl = len(p)
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outs = []
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while i < pl and len(outs) < lO:
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o, *a = p[i].split()
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match o:
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case "cpy":
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kv, t = a
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if t in "abcd":
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r[t] = int(kv) if kv not in "abcd" else r[kv]
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i += 1
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case "out":
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kv, *_ = a
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outs.append(f'{int(kv) if kv not in "abcd" else r[kv]}')
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i += 1
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case "jnz":
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kv, d = a
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c = int(kv) if kv not in "abcd" else r[kv]
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d = int(d) if d not in "abcd" else r[d]
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i += 1 if c == 0 else d
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case "inc":
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r[a[0]] += 1
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i += 1
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case "dec":
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r[a[0]] -= 1
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i += 1
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case "tgl":
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kv = a[0]
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c = int(kv) if kv not in "abcd" else r[kv]
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if 0 <= i + c < pl:
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old, *v = p[i + c].split()
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match old:
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case "inc":
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nw = "dec"
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case "dec":
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nw = "inc"
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case "tgl":
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nw = "inc"
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case "jnz":
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nw = "cpy"
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case _:
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nw = "jnz"
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p[i + c] = " ".join([nw] + v)
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i += 1
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return "".join(outs)
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if __name__ == "__main__":
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with open("./input/25.txt", "r") as f:
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inp = f.read().strip()
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p1, p2 = solve(inp)
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print(p1)
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