题解 | #查找#

#include<bits/stdc++.h>
using namespace std;
int main() {
    set<int>s;
    //write your code here......
    int n, m, x, num;

    cin >> n >> m;

    for (int i = 0; i < n; i++) {
        cin >> num;
        s.insert(num);
    }

    for (int i = 0; i < m; i++) {
        cin >> x;

        auto iter = s.upper_bound(x);
		
        if (iter == s.end()) {
            cout << -1 << endl;
        } else {
            cout << *iter << endl;

        }
    }

    return 0;
}