题解 | #查找#

#include<bits/stdc++.h>
#include <iterator>
using namespace std;
int main() {
    set<int>s;
    //write your code here......
    int n, m, x, a;
    cin >> n;
    cin >> m;
    for (int i = 0; i < n; i++) {
        cin >> a;
        s.insert(a);
    }
    for (int i = 0; i < m; i++) {
        cin >> x;
        auto it = s.upper_bound(x);

        if (it == s.end())
            cout << -1 << endl;
        else 
            cout << *it << endl;
    }
    return 0;
}