Concert Tickets.cpp

#include<bits/stdc++.h>
using namespace std;
#define INF 2147483647
#define INFL 9223372036854775807
#define pii pair<int,int>
#define F first
#define S second
#define mp make_pair
#define pb push_back
#define ll long long
#define ull unsigned long long
#define M 1000000007
#define FASTIO ios_base::sync_with_stdio(false);cin.tie(NULL); cout.tie(NULL);
#define take(x) scanf("%d",&x)
#define DE(x) printf("\ndebug %d\n",x);
#define vout(x) for(int i=0;i<x.size();i++) printf("%d ",x[i]);
#define pie acos(-1)
#define MOD 998244353


int main(){
    int n,m;
    cin>>n>>m;
    multiset<ll,greater<int>> ms;
    ll a;
    for(int i=0;i<n;i++){
        cin>>a;
        ms.insert(a);
    }
    ll para[m];
    for(int i=0;i<m;i++){
        cin>>para[i];
    }
    for(int i=0;i<m;i++){
        auto it = ms.lower_bound(para[i]);
        if( it == ms.end() ){
            cout<<-1<<endl;
        } else{
            cout<<*it<<endl;
            ms.erase(it);
        }
    }
}