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qidao

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Accepted problems：19 problems

961 1355 1359 1454 5101 5112 6624 7880 9246 10817 10835 10849 14304 14323 14549 14550 14554 14709 14717

Tried problems：13 problems

5110 5460 6280 6623 7733 7898 7904 9253 10855 11632 13006 13010 13013

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