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https://www.nowcoder.com/practice/8e0c0e8c78944847be9bca54b59d713f
#include<bits/stdc++.h>
using namespace std;
int main(){
set<int>s;
//write your code here......
int n, m, x, a;
cin >> n >> m;
for (int i =0; i < n; ++i) {
cin >> a;
s.insert(a);
}
while (m--) {
cin >> x;
auto p = s.upper_bound(x);
if (p != s.end()) {
cout << *p << endl;
} else {
cout << -1 << endl;
}
}
return 0;
}
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