题解 | #查找#

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