题解 | #查找#

#include<bits/stdc++.h>
#include <utility>
using namespace std;
int main(){
	set<int>s;
	//write your code here......
	int n,m,x;
	cin>>n>>m;
	for(int i=0;i<n;i++){
		int temp=0;
		cin>>temp;
		s.insert(temp);
	}
	//set<int>::iterator p;
	for(int i=0;i<m;i++){
		cin>>x;
		auto p=s.upper_bound(x);
		if(p!=s.end()){
			cout<<*p<<endl;
		}
		else{
			cout<<-1<<endl;
		}
	}
	
	return 0;
}