[2019.08.31] 2019 Yinchuan network game (2018 Yinchuan live match)

Replenishment Address: https://www.jisuanke.com/contest/2991

A:✅

B:✅

C:✅

D:

E:

F:✅

G:

H:✅

I:

J:

K:

L: https://blog.csdn.net/Cassie_zkq/article/details/100388082  segment tree stack monotone + + thinking

M: