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Codeforces Round #654 (Div. 2) A 直接看样列输出，样列一看就是要输出(n+1)/2，我也不想想了，直接秒A 代码附： #pragma GCC optimize("Ofast","inline","-ffast-math") #pragma GCC target("avx,sse2,sse3,sse4,mmx") #include<bits/stdc++.h> #define int long long using namespace std; const int