This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define fi first
#define se second
#define all(m) (m).begin(), (m).end()
#define rall(m) (m).rbegin(), (m).rend()
#define vec vector
#define sz(a) (int) (a).size()
#define mpp make_pair
#define mtt make_tuple
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
typedef pair <int, int> pii;
typedef tuple <int, int, int> tui;
template <typename T> bool umin(T &a, T b) { return a > b ? a = b, 1 : 0; }
template <typename T> bool umax(T &a, T b) { return a < b ? a = b, 1 : 0; }
mt19937 rng((uint64_t) new char);
int solve(){
int n, k;
cin >> n >> k;
int z = n + k;
vec <int> a(z);
for (auto &i: a) cin >> i;
gp_hash_table <int, null_type> s(all(a));
auto get_ans = [&](int x){
vec <int> ans;
for (int l = 0; l < z; ++l){
if (s.find(x - a[l]) != s.end() && n){
ans.push_back(a[l]);
ans.push_back(x - a[l]);
s.erase(a[l]), n -= 2;
}
}
sort(all(ans));
for (auto &l: ans) cout << l << " ";
exit(0);
};
if (n < k){
for (int i = 0; i < z; ++i){
for (int j = i + 1; j < z; ++j){
int x = a[i] + a[j];
int cnt = 0;
for (int l = 0; l < z; ++l){
cnt += s.find(x - a[l]) != s.end();
}
if (cnt >= n) get_ans(x);
}
}
return 0;
}
while(true){
shuffle(all(a), rng);
int ai = a[rng() % n];
for (auto &aj: a){
int x = ai + aj;
int cnt = 0;
for (int i = 0; i < 2 * k; ++i){
cnt += s.find(x - a[i]) != s.end();
}
if (cnt >= k) get_ans(x);
}
}
return 0;
}
signed main(){
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
int tst = 1; //cin >> tst;
while(tst--) solve();
return 0;
}
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