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# <20><>Ŀ
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* https://vjudge.net/contest/511373#problem/B
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### <20><><EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD>ͼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>L
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2022-08-22 22:19:52 +08:00
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### <20><><EFBFBD><EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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mid=(l+r)/2;
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midr(mid+r)/2;
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Զ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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### <20>ؼ<EFBFBD><D8BC><EFBFBD>
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<EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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### <20>״<EFBFBD><D7B4><EFBFBD>
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* <20><>ʼλ<CABC><CEBB>
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### <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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2022-08-22 23:19:43 +08:00
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* <20><><EFBFBD><EFBFBD> 15. https://note.youdao.com/web/#/file/recent/note/WEBbda8b62456b542bf29edf7a52005e158/
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