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A:65 a:97 0:48 null:0 阅读全文
posted @ 2020-01-15 20:51
qdu_lkc
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摘要:
Besides the ordinary Boy Friend and Girl Friend, here we define a more academic kind of friend: Prime Friend. We call a nonnegative integer A is the i 阅读全文
posted @ 2020-01-15 10:50
qdu_lkc
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