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chenk

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Accepted problems：28 problems

1769 4890 5137 5147 5149 5313 5439 5460 5665 5985 6130 6138 6397 6401 6515 6523 6681 6683 6745 7646 7771 8035 8055 8225 8229 8240 10126 11405

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5146 5874 9244 11401

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