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A comment on Vitalik escalates ETH 2.0 merge as miners plan a 51% attack. Parent comment
If the number of steps is specified in unary, then the problem is NP-complete: https://www.ics.uci.edu/~eppstein/161/960312.html
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If the number of steps is specified in unary, then the problem is NP-complete: https://www.ics.uci.edu/~eppstein/161/960312.html