#include <bits/stdc++.h>
#define all(v) ((v).bvin(),(v).end())
#define ll long long
using namespace std;
const ll mod = 1e9 + 7;
const ll mxN = 2e6 + 3;
bool vis[mxN];
int b[mxN];
int a[mxN];
int mx,mn;
void pshmx(){
while(vis[mx]){
mx--;
}
}void pshmn(){
while(vis[mn]){
mn++;
}
}
signed main()
{
ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
int n;
cin >>n;
mx = 2 * n - 1;mn = 1;
for(int i = 1;i <= n;i++) cin >> b[i];
a[1] = b[1];
vis[b[1]] = 1;
pshmn();
pshmx();
for(int i = 2;i <= n;i++){
int l = 2 * i - 2,r = 2 * i - 1;
if(b[i - 1] < b[i]){
if(!vis[b[i]]){
a[l] = b[i];vis[a[l]] = 1;
}
else{
pshmx();
a[l] = mx;vis[mx] = 1;
pshmx();
}
pshmx();
a[r] = mx;vis[mx] = 1;
pshmx();
}
if(b[i - 1] > b[i]){
if(!vis[b[i]]){
a[l] = b[i];vis[a[l]] = 1;
}
else{
pshmn();
a[l] = mn;vis[mn] = 1;
pshmn();
}
pshmn();
a[r] = mn;vis[mn] = 1;
pshmn();
}
if(b[i - 1] == b[i]){
pshmx();
pshmn();
a[l] = mn;vis[mn] = 1;
a[r] = mx;vis[mx] = 1;
pshmn();
pshmx();
}
}
for(int i = 1;i <= 2 * n - 1;i++){
cout<<a[i]<<' ';
}
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
0 ms |
340 KB |
Output is correct |
2 |
Correct |
0 ms |
340 KB |
Output is correct |
3 |
Correct |
0 ms |
340 KB |
Output is correct |
4 |
Correct |
0 ms |
340 KB |
Output is correct |
5 |
Correct |
0 ms |
340 KB |
Output is correct |
6 |
Correct |
1 ms |
340 KB |
Output is correct |
7 |
Correct |
0 ms |
340 KB |
Output is correct |
8 |
Correct |
0 ms |
340 KB |
Output is correct |
9 |
Correct |
1 ms |
340 KB |
Output is correct |
10 |
Correct |
0 ms |
340 KB |
Output is correct |
11 |
Correct |
0 ms |
340 KB |
Output is correct |
12 |
Correct |
0 ms |
340 KB |
Output is correct |
13 |
Correct |
1 ms |
340 KB |
Output is correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
1 ms |
340 KB |
Output is correct |
2 |
Correct |
1 ms |
340 KB |
Output is correct |
3 |
Correct |
2 ms |
468 KB |
Output is correct |
4 |
Correct |
3 ms |
724 KB |
Output is correct |
5 |
Correct |
6 ms |
1108 KB |
Output is correct |
6 |
Correct |
12 ms |
1896 KB |
Output is correct |
7 |
Correct |
19 ms |
2936 KB |
Output is correct |