竞赛头

#include<bits/stdc++.h>
using namespace std;
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define rush! ios::sync_with_stdio(false);cin.tie(0);
const int inf = 0x3f3f3f3f;
const long long linf = 0x3f3f3f3f3f3f3f3f;

 

来源：https://www.cnblogs.com/LH2000/p/12373015.html