Codeforces Round #651 (Div. 2) A~D題解

比賽連接：Codeforces Round #651 (Div. 2) 目錄ios 比賽連接：Codeforces Round #651 (Div. 2)數組 A. Maximum GCDspa B. GCD Compressioncode C. Number Gameblog D. Odd-Even Subsequenceget A. Maximum GCD 題意：給定一個N，問1~N中若選出一

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