补题记录

https://codeforces.com/contest/1903/problem/E
交互题 Geo Game

https://codeforces.com/contest/1903/problem/F
2-sat 图论题 Babysitting

https://codeforces.com/contest/1903/problem/D2
一个奇怪的题目

https://atcoder.jp/contests/abc331/tasks/abc331_f
线段树

https://atcoder.jp/contests/abc331/tasks/abc331_g
生成函数 ntt