rt，测试点反馈信息：

Received signal 6: Aborted/IOT trap.

蒟蒻代码如下：

#include <iostream>
#include <vector>
#include <map>
using namespace std;
int n, ope, len, num;
map<int, bool> gar;
int main(){
	cin>>n;
	for(int i=1;i<=n;i++){
		cin>>ope>>len;
		switch(ope){
			case 1:
				if(gar.count(len))
					cout<<"Already Exist"<<'\n';
				else
					gar[len]=1, ++num;
				break;
			case 2:
				if(!num)	cout<<"Empty"<<'\n';
				else {
					--num;
					if(gar.count(len))	cout<<len<<'\n', gar.erase(len);
					else{
						gar[len]=1;
						map<int, bool>::iterator l=gar.find(len);
						map<int, bool>::iterator r=l;
						if(r==gar.end())
							cout<<(--r)->first<<'\n', gar.erase(l);
						else if(l==gar.begin())
							cout<<(++r)->first<<'\n', gar.erase(r);
						else{
							--l;	++r;
								cout<<l->first<<' '<<r->first<<'\n';
							if(len-(l->first)<=(r->first)-len)
								cout<<l->first<<'\n', gar.erase(l);
							else
								cout<<r->first<<'\n', gar.erase(r);
						} 	
						gar.erase(len);
					}	
				}	
		}
	}
	return 0;
}

p.s:定义l、r时本试图使用auto，但报错并反馈'' 'l' does not name a type.'' 如果可以的话想一并请教