#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define pii pair<int, int>
#define mp make_pair
#define fi first
#define se second
struct V{
	vector<pii> g;
	bool cmp(pii a,pii b){
		return a.se<b.se; 
	}
	void so() {
		sort(g.begin(),g.end(),cmp);
	}
}a;
signed main() {
	a.g.pb(mp(1,0));a.g.pb(mp(0,1));a.so();
} 

为什么 CE？