Codeforces Round #649 (Div. 2) / contest 1364

目录 A XXXXX B Most socially-distanced subsequence C Ehab and Prefix MEXs D Ehab's Last Corollary E X-OR A B C D E √ √ √ ○ ○ ( √:作出; ●:尝试未作出; ○:已补题 )html 题目地址:https://codeforces.com/contest/1364c++ 这一次作
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