[BZOJ5110][CODE+ DIV1 T4]Yazid 的新生舞会 线段树
题解网上太多了 推荐官方题解https://cp.thusaac.org/contests/5a131456aa5ec762c97f6231#include <bits/stdc++.h>#define ll long long#define lf double#define E complex<lf>#define inf 0x3f3f3f3f#define eps 1e-8#def