20200517數論總結

作數論的時候每每題目都不算難，可是一寫就超時，老是習慣性用暴力解決問題，可是事實上有不少須要不停積累的省時小技巧 Largest prime factorphp Everybody knows any number can be combined by the prime number. Now, your task is telling me what position of the large

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