mirror of
https://github.com/osmarks/random-stuff
synced 2024-11-09 13:59:55 +00:00
73 lines
2.0 KiB
Python
73 lines
2.0 KiB
Python
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import subprocess
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import ctypes
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import tempfile
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import bisect
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fibs = [0, 1]
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def make_fibs(n):
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while fibs[-1] < n:
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fibs.append(fibs[-1] + fibs[-2])
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def dfs(target, inuse=set()):
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make_fibs(target)
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end_index = bisect.bisect_left(fibs, target)
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if fibs[end_index] == target and target not in inuse:
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return inuse | {end_index}
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for i, possibility in enumerate(fibs[end_index:1:-1]):
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reali = end_index - i
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if reali in inuse: continue
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new = inuse | {reali}
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if result := dfs(target - possibility, new): return result
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make_fibs(2**63)
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print(len(fibs))
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"""
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raise SystemExit()
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for i in range(2, 10000):
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print("doing", i)
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res = dfs(i)
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print(res)
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assert sum(map(lambda x: fibs[x], res)) == i, "numbers do not sum to thing"
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assert tuple(sorted(set(res))) == tuple(sorted(res)), "things are not unique"
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"""
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def c_wrapper(file):
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print("Compiling", file)
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temp = tempfile.mktemp(prefix="lib-compile-")
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print(temp)
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if subprocess.run(["gcc", file, "-o", temp, "-shared", "-fPIC"]).returncode != 0:
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raise ValueError("compilation failed")
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library = ctypes.CDLL(temp)
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entry = library.f
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entry.restype = ctypes.POINTER(ctypes.c_int64)
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def wrapper(n):
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vlen_ptr = ctypes.c_int(0)
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out = entry(n, ctypes.byref(vlen_ptr))
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l_out = []
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for i in range(vlen_ptr.value):
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#print(out[i])
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l_out.append(out[i])
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return l_out
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return wrapper
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def gollariosolver(n):
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#print(n, "is n")
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x = bisect.bisect_left(fibs, n)
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out = set()
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z = 0
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for i in range(x, 0, -1):
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#print("gollario", i, z, fibs[i])
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if (y := fibs[i] + z) <= n:
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z = y
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out.add(i)
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if z == n:
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return out
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print(fibs[12]+ fibs[23] + fibs[34])
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c_code = c_wrapper("fib.c")
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for i in range(2, 2**16):
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res = c_code(i)
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#res = gollariosolver(i)
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assert sum(map(lambda x: fibs[x], res)) == i, "numbers do not sum to thing"
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assert tuple(sorted(set(res))) == tuple(sorted(res)), "things are not unique"
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