2 ms·
It is different because a safe combination may contain the same digit more than once, so the intended solution is a de Bruijn sequence: https://en.wikipedia.org
by robinhouston 8y ago
It is different because a safe combination may contain the same digit more than once, so the intended solution is a de Bruijn sequence: https://en.wikipedia.org/wiki/De_Bruijn_sequence https://en.wikipedia.org/wiki/De_Bruijn_sequence