D 手术 不知道正确解法,直接set暴力水过了捏 #include <bits/stdc++.h> using namespace std; #define IO ios::sync_with_stdio(0);cin.tie(0);cout.tie(0); #define endl '\n' #define x first #define y second #define pd push_back #define pii pair<double,double> #define It set<ran>::iterator typedef long long ...