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> //Andrei Alexandru a.k.a Sho10
#define ll long long
#define double long double
#pragma GCC optimize("O3")
#pragma GCC optimize("Ofast")
#define aint(a) (a).begin(), (a).end()
#define f first
#define s second
#define pb push_back
#define mp make_pair
#define pi pair
#define rc(s) return cout<<s,0
#define endl '\n'
#define mod 1000000007
#define PI 3.14159265359
#define MAXN 100005
#define INF 1000000005
#define LINF 1000000000000000005ll
#define CODE_START ios_base::sync_with_stdio(false);cin.tie(0);cout.tie(0);
using namespace std;
ll n,k,a[200005];
vector<ll>v;
map<ll,ll>viz;
ll check(ll sum){
ll l=1,r=n+k;
v.clear();
ll cnt=0;
while(l<r){
if(a[l]+a[r]==sum){
v.pb(a[l]);
v.pb(a[r]);
l++;
r--;
cnt++;
}else if(a[l]+a[r]<sum){
l++;
}else {
r--;
}
}
if(cnt>=n/2){
return 1;
}else return 0;
}
int32_t main(){
CODE_START;
cin>>n>>k;
for(ll i=1;i<=n+k;i++)
{
cin>>a[i];
}
for(ll i=1;i<=2*k;i++)
{
for(ll j=n-k;j<=n+k;j++)
{
viz[a[i]+a[j]]++;
}
}
for(auto it : viz){
if(it.s<k){
continue;
}
ll s1=check(it.f);
if(s1==1){
sort(v.begin(),v.end());
for(auto x : v){
cout<<x<<' ';
}
return 0;
}
}
}
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