This is quick because it's operating on a very small, localized part of the map.
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Grammarly finds grammar and punctuation mistakes, whereas ProWritingAid identifies run-on sentences and fragments.
Like the N-closest algorithm, the weight of each candidate is given by the inverse of its distance to the input colour. Because of this, both algorithms produce output of a similar quality, although the N-convex method is measurably faster. As with the last algorithm, more details can be found in the original paper[2].