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everyone who/whom 7 legs of love :marseyspider:  2yr ago (text post) 162 thread views #133191

Day 21 AoC: use Z3 b-words

Post code, boast about it.

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    def eval(s, zs = None):
        nonlocal humn
        if zs and s == 'humn':
            humn = z3.Int('humn')
            return humn

        x = data[s]
        if isinstance(x, int):
            return x
        if isinstance(x, str):
            data[s] = eval(x, zs)
            return data[s]
        a, op, b = x
        a = eval(a, zs)
        b = eval(b, zs)
        data[s] = a, op, b
        if zs and s == 'root':
            op = '='
        op = {
            '+': operator.add,
            '-': operator.sub,
            '*': operator.mul,
            '/': lambda xx, yy: xx / yy if zs else xx // yy,
            '=': operator.eq,
        }[op]
        if zs:
            if (isinstance(a, int) and isinstance(b, int)):
                return op(a, b)
            print(s, x)
            var = z3.Int(s)
            zs.add(var == op(a, b))
            return var

        return op(a, b)

    if not second:
        return eval('root')

    import z3
    zs = z3.Solver()
    root = eval('root', zs)
    zs.add(root == True)
    assert zs.check() == z3.sat
    print(zs.model())
    return zs.model().eval(humn).as_long()

I told you bros, learn Z3. It even has typescript bindings! Tho I wasted so much time trying to figure out why it doesn't support this newfangled '//' operator. Also I was puzzled for a long time why it gives me 0 as an acceptable answer when I don't tell it that root must be true LMAO.

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I must say that rdrama is the last place I expected to see someone advocating for the use of an SMT solver. :parrotscience:

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SMT solver

i just want one that proves my program halts for sure.

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Try SPARK then. Termination proofs don't play well with unbounded resources.

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i mean. my computer's resources aren't unbounded. i wouldn't mind if they were, but they aren't

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tbh the whole thing, the number of people here who even participated in AoC is mindblowing and weird.

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