#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];
int v[N];
bool viz[N];
void upd(int i,int x)
{
v[i]=x;
viz[x]=1;
}
int mip=1;
int mxp;
int f_mi()
{
while(viz[mip])
{
mip++;
}
return mip;
}
int f_mx()
{
while(viz[mxp])
{
mxp--;
}
return mxp;
}
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<=n;i++)
{
cin>>b[i];
}
mxp=2*n-1;
upd(1,b[1]);
upd(3,b[2]);
if(b[1]<b[2])
{
upd(2,f_mx());
}
else
{
upd(2,f_mi());
}
for(int i=3;i<=n;i++)
{
int p=2*i-1;
if(b[i-1]==b[i])
{
upd(p-1,f_mi());
upd(p,f_mx());
}
if(b[i-1]<b[i])
{
if(viz[b[i]]==0)
{
upd(p,b[i]);
upd(p-1,f_mi());
}
else
{
upd(p-1,f_mx());
upd(p,f_mx());
}
}
if(b[i-1]>b[i])
{
if(viz[b[i]]==0)
{
upd(p,b[i]);
upd(p-1,f_mx());
}
else
{
upd(p-1,f_mi());
upd(p,f_mi());
}
}
///if(i==5) break;
}
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
**/
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
2 ms |
504 KB |
Not a permutation |
2 |
Incorrect |
2 ms |
604 KB |
Output isn't correct |
3 |
Incorrect |
2 ms |
716 KB |
Output isn't correct |
4 |
Incorrect |
2 ms |
716 KB |
Not a permutation |
5 |
Incorrect |
2 ms |
848 KB |
Output isn't correct |
6 |
Correct |
2 ms |
848 KB |
Output is correct |
7 |
Incorrect |
2 ms |
864 KB |
Not a permutation |
8 |
Incorrect |
2 ms |
972 KB |
Output isn't correct |
9 |
Incorrect |
2 ms |
972 KB |
Output isn't correct |
10 |
Incorrect |
2 ms |
972 KB |
Output isn't correct |
11 |
Incorrect |
2 ms |
972 KB |
Not a permutation |
12 |
Incorrect |
2 ms |
1028 KB |
Output isn't correct |
13 |
Incorrect |
2 ms |
1028 KB |
Output isn't correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
2 ms |
1028 KB |
Output isn't correct |
2 |
Incorrect |
3 ms |
1084 KB |
Not a permutation |
3 |
Incorrect |
4 ms |
1108 KB |
Output isn't correct |
4 |
Incorrect |
6 ms |
1528 KB |
Output isn't correct |
5 |
Incorrect |
10 ms |
2024 KB |
Not a permutation |
6 |
Incorrect |
17 ms |
3236 KB |
Not a permutation |
7 |
Incorrect |
27 ms |
4892 KB |
Not a permutation |