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;
const int maxn=2e5+5;
bool ck[maxn];
int a[maxn];
int n;
int bit[maxn];
void upd(int pos, int val) {
for(int i=pos ; i<=2*n-1 ; i+=i&-i) {
bit[i]+=val;
}
}
int pf(int pos) {
int res=0;
for(int i=pos ; i>=1 ; i-=i&-i) {
res+=bit[i];
}
return res;
}
int sum(int l, int r) {
return pf(r)-pf(l-1);
}
signed main() {
cin>>n;
for(int i=1 ; i<=n ; i++) {
cin>>a[i];
}
int l=1;
int r=2*n-1;
for(int i=1 ; i<=n ; i++) {
int sm=sum(1,a[i]-1);
int lg=sum(a[i]+1,2*n-1);
if(!ck[a[i]]) {
cout<<a[i]<<' ';
ck[a[i]]=1;
upd(a[i],1);
}
while(sm<lg) {
while(ck[l]) l++;
cout<<l<<' ';
ck[l]=1;
upd(l,1);
sm++;
}
while(lg<sm) {
while(ck[r]) r--;
cout<<r<<' ';
ck[r]=1;
upd(r,1);
lg++;
}
if(sm+lg<2*(i-1)) {
while(ck[l]) l++;
cout<<l<<' ';
ck[l]=1;
upd(l,1);
while(ck[r]) r--;
cout<<r<<' ';
ck[r]=1;
upd(r,1);
}
}
}
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