Codeforces Round #651 (Div. 2) / contest 1370

目錄 A Maximum GCD B GCD Compression C Number Game D Odd-Even Subsequence E Binary Subsequence Rotation F The Hidden Pair A B C D E F √ √ √ √ √ ○ （ √：作出； ●：嘗試未作出； ○：已補題 ）html 題目地址：https://codeforces.com

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