楼主: superacid
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[一个有趣的数论题]升级版 |
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19events = 644days
PB (2 3 4 5)B = 1200seconds 北大魔方爱好者QQ群74893945 mf8最少步讨论群:RP与公式的绝佳配合QQ群5652935 |
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