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>
using namespace std;
vector<int>vv;
int a[100009*2+2];
int v[100009*2+2];
int get (int x)
{
	while (v[x]==1)
	{
		x--;
	}
	v[x]=1;
	return x;
}
int get1 (int x)
{
	while (v[x]==1)
	{
		x++;
	}
	v[x]=1;
	return x;
}
int main()
{
	int l=1;
	
	int n;cin>>n;
	int r=(2*n)-1;
	for(int i=1;i<=n;i++)
	{
		
		cin>>a[i];
		if (i==1)
		{
			v[a[i]]=1;
			vv.push_back(a[i]);
			continue;
		}
		
		if (v[a[i]]==1)
		{
			if (a[i]>a[i-1])
			{
				r=get (r);
				v[r]=1;
				vv.push_back(r);
				
				r=get (r);
				v[r]=1;
				vv.push_back(r);
				}
			else if (a[i]<a[i-1]){
				l=get1 (l);
				v[l]=1;
				vv.push_back(l);
				
				l=get1 (l);
				v[l]=1;
				vv.push_back(l);
				
				
			}
			else {
				l=get1 (l);
				r=get (r);
				v[r]=1;v[l]=1;
				vv.push_back(l);
				vv.push_back(r);
			}
		}
		else {
			if (a[i]>a[i-1])
			{
				v[a[i]]=1;
				r=get (r);
				v[r]=1;
				vv.push_back(a[i]);
				vv.push_back(r);
			}
			else {
				v[a[i]]=1;
				l=get1 (l);
				v[l]=1;
				vv.push_back(a[i]);
				vv.push_back(l);
			}
		}
	}
for(auto pp:vv)cout<<pp<<" ";
 return 0;
}
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