甚至普通的过了简化的没过

#include<bits/stdc++.h>
using namespace std;
int n,opt,tmp;
vector<int>tree;
void opt2(){
    printf("%d\n",tree[tmp-1]);
}
int opt3(){
    static auto it1=lower_bound(tree.begin(),tree.end(),tmp);
	if(it1==tree.end())return -2147483647;
	else{
	    --it1;
	    return*(it1);
	} 
}
void opt4(){
    static auto it2=upper_bound(tree.begin(),tree.end(),tmp);
	if(it2==tree.end())puts("2147483647");
	else printf("%d\n",*(it2));
}
void opt5(){
    tree.insert(lower_bound(tree.begin(),tree.end(),tmp),tmp);
}
void opt1(){
    bool f=0;
    if(opt3()==-2147483647)
        tree.insert(lower_bound(tree.begin(),tree.end(),tmp),tmp),f=1;
	printf("%d\n",*(lower_bound(tree.begin(),tree.end(),tmp))-*(tree.begin())+1);
    if(f)tree.erase(lower_bound(tree.begin(),tree.end(),tmp));
}
int main(){
	scanf("%d",&n);
	while(n--){
		scanf("%d%d",&opt,&tmp);
		switch(opt){
			case 2:
			    opt2();
			break;
			case 3:
			    printf("%d\n",opt3());
			break;
			case 4:
			    opt4();
			break;
			case 5:
			    opt5();
			break;	
			case 1:
			    opt1();
			break;
		}
	}
	return 0;
}