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D. Round Subset 老早写过了,但是边界考虑不太清楚 https://codeforces.com/problemset/problem/837/D #include <bits/stdc++.h> #define ll long long using namespace std; co 阅读全文
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# Codeforces Round 690 (Div. 3) https://codeforces.com/contest/1462 ## A. Favorite Sequence 按题意输出 ```CC #include using namespace std; const int N = 1e 阅读全文