Optimize Curve Data answer check #552
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Resolves #71. I haven't read into the original code too deeply but it brings up Heap's algorithm so my guess is it runs in pessimistic n! time or so, with a number of heuristics in place to mitigate it for common inputs. My algorithm runs in O(n^2). It can be improved further by heuristics if need be, but my testing suggests it already checks any realistically humanly solvable grid in an instant.