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Accepted problems：40 problems

61 490 491 494 500 544 546 616 641 642 648 650 651 653 5002 13257 13260 13262 21998 22000 22001 22002 22003 22004 22005 22008 22012 22016 22017 22019 22020 22021 22022 22023 22024 22025 22026 22031 22032 22034

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