received 504 gateway error.
Just found that it is back.
Finished prob 136 A-E.
next_permutation() tries to generate lexico next permutation from current. It returns FALSE if cannot find a lexico greater perm. So if you start with [1 3 2]. The perm [1 2 3] never gets generated. To be sure, first sort your vector to be lexico minimum.
problem E is about a game and you have to find an explicit strategy.
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