이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#pragma GCC optimize ("O3")
#pragma GCC optimize("O3,unroll-loops")
#pragma GCC target("avx,avx2,fma")
#include <bits/stdc++.h>
#include<ext/pb_ds/assoc_container.hpp>
#include<ext/pb_ds/tree_policy.hpp>
// author: amin_2008
#define ios ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0)
#define ll long long
#define vi vector<int>
#define vs vector<string>
#define vc vector<char>
#define vl vector<ll>
#define all(v) v.begin(), v.end()
#define rall(v) v.rbegin(), v.rend()
#define pb push_back
#define bpc __builtin_popcount
#define pii pair<int, int>
#define pll pair<ll, ll>
#define piii pair<pii, int>
#define vpii vector<pii>
#define vpll vector<pll>
#define vvpii vector<vpii>
#define vvi vector<vector<int>>
#define vvl vector<vector<ll>>
#define ins insert
#define ts to_string
#define F first
#define S second
#define lb lower_bound
#define ub upper_bound
#define ld long double
#define ull unsigned long long
#define endl '\n'
//#define int ll
using namespace std;
using namespace __gnu_pbds;
using namespace __cxx11;
template<class T> using ordered_set = tree<T, null_type,less<T>, rb_tree_tag,tree_order_statistics_node_update>;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
const ll inf = 2e5 * 1e9;
const int mod = 1e9+7;
const int sz = 2e5+5;
const int N = 33;
const int logg = 18;
const int P = 40000005;
const ll M = 8e5+5;
int a[sz];
void solve()
{
int n;
cin >> n;
set<int> s;
for(int i = 1; i <= n * 2 - 1; i++)
s.ins(i);
vi v, a(n);
for(int i = 0; i < n; i++) cin >> a[i];
v.pb(a.front());
s.erase(a.front());
for(int i = 1; i < n; i++)
{
if ( a[i] == a[i-1] )
{
int mini = *s.begin();
int maks = *s.rbegin();
v.pb(mini), v.pb(maks);
s.erase(mini), s.erase(maks);
continue;
}
if ( a[i] > a[i-1] )
{
int maks = *s.rbegin();
v.pb(maks);
s.erase(maks);
if ( s.find(a[i]) != s.end() )
v.pb(a[i]),
s.erase(a[i]);
else
{
maks = *s.rbegin();
v.pb(maks);
s.erase(maks);
}
continue;
}
int mini = *s.begin();
v.pb(mini);
s.erase(mini);
if ( s.find(a[i]) != s.end() )
v.pb(a[i]),
s.erase(a[i]);
else
{
mini = *s.begin();
v.pb(mini);
s.erase(mini);
}
}
for(auto i : v)
cout << i << ' ';
}
signed main()
{
ios;
//precompute();
int t = 1;
//cin >> t;
while(t--){
solve();
}
}
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