A 签到 #include<bits/stdc++.h> using namespace std; #define IOS ios::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr) #define lowbit(x) ((x)&(-(x))) #define foru(i,begin,end) for(i=begin;i<=end;i++) #define ford(i,begin,end) for(i=begin;i>=end;i--) #define INF 0x3f3f3f3f #defi...