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loj 2719 [NOI2018]冒泡排序 https://loj.ac/problem/2719 \(T =5,\sum n \le 2000000\) Tutorial https://www.cnblogs.com/Dance-Of-Faith/p/9339572.html 考虑什么样的排列 阅读全文
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agc041_c Duomino Quality https://atcoder.jp/contests/agc041/tasks/agc041_c Tutorial https://img.atcoder.jp/agc041/editorial.pdf 称每行每列的quality为$Q$的大小为$ 阅读全文
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arc096_f Sweet Alchemy https://atcoder.jp/contests/arc096/tasks/arc096_d Tutorial 这是一个树的结构,可以差分一下,令$c'i=c_i-c$,特别的$c'_1=c_1$,那么限制变为了$\forall i \in [2, 阅读全文
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CodeForces 1361E James and the Chase https://codeforces.com/contest/1361/problem/E Tutorial https://codeforces.com/blog/entry/78355 考虑对于一个点如何判断它是否为int 阅读全文
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CodeForces 547D Mike and Fish https://codeforces.com/contest/547/problem/D Tutorial https://codeforces.com/blog/entry/18126 二分图,左右分别有$2 \times 10^5$个节 阅读全文
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CodeForces 576E Paingting Edges https://codeforces.com/contest/576/problem/E Tutorial https://blog.csdn.net/PoPoQQQ/article/details/48467731 首先,这一类在 阅读全文
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CodeForces 1361D Johnny and James https://codeforces.com/contest/1361/problem/D Tutorial https://codeforces.com/blog/entry/78355?f0a28=1 可以把这道题看作这样一个结 阅读全文
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agc027_d Modulo Matrix https://atcoder.jp/contests/agc027/tasks/agc027_d Tutorial https://img.atcoder.jp/agc027/editorial.pdf 想办法去掉$\max,\min$.由于是网格图, 阅读全文