i want an help beecause it is a difficult questions (sorry for mine poor english)
i want an help beecause it is a difficult questions (sorry for mine poor english)
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You can make graph with edges between i and i + 1. Also when you visit some verix u with digit x, and you haven't visited any other vertix with the same digit, you can push all of them into the queue, setting the distance to them dst[u] + 1.