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;
typedef long long ll;
typedef long double ld;
const int N=2*100000+5;
int n;
int b[N];
bool viz[N];
int v[N];
int aib[N];
void add(int p,int x)
{
for(int i=p;i<N;i+=i&(-i))
{
aib[i]+=x;
}
}
int prefix(int p)
{
int a=0;
for(int i=p;i>=1;i-=i&(-i))
{
a+=aib[i];
}
return a;
}
set<int>lft;
void upd(int i,int x)
{
viz[x]=1;
v[i]=x;
add(x,1);
lft.erase(x);
}
int small(int x)
{
return prefix(x-1);
}
int big(int x)
{
return prefix(N-1)-prefix(x);
}
int mi()
{
auto it=lft.begin();
return *it;
}
int ma()
{
auto it=lft.end();
it--;
return *it;
}
int main()
{
ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
// freopen("medians.in","r",stdin);
// freopen("medians.out","w",stdout);
cin>>n;
for(int i=1;i<=2*n-1;i++)
{
lft.insert(i);
}
for(int i=1;i<=n;i++)
{
cin>>b[i];
}
upd(1,b[1]);
for(int i=2;i<=n;i++)
{
int p=2*i-2;
int x=b[i];
if(viz[x]==0)
{
upd(p++,x);
}
int a=small(x);
int b=big(x);
if(a==b)
{
upd(p++,mi());
upd(p++,ma());
}
while(a<b)
{
upd(p++,mi());
a++;
}
while(a>b)
{
upd(p++,ma());
b++;
}
if(p!=2*i)
{
while(1) {}
}
}
for(int i=1;i<=2*n-1;i++)
{
cout<<v[i]<<" ";
}
cout<<"\n";
return 0;
}
/**
1 3 3 4 5
1 ? 3 ? ? ? ? ? ?
1 9 3 2 4 8 7 5 6
f(i) = i / 2
info (i)
:
x;
exista x
f(i) < x
f(i) > x
**/
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