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regu

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Accepted problems：31 problems

459 491 492 493 494 498 544 545 616 620 651 13255 13257 13258 13261 13263 21998 21999 22002 22006 22007 22008 22016 22017 22021 22026 22028 22030 22033 22034 22035

Tried problems：1 problem

Authored problems：0 problem

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