#include <bits/stdc++.h>
#define ll long long
using namespace std;
const int maxn = 100100;
int tree[8*maxn], b[maxn], a[2*maxn], n;
bool used[2*maxn];
void update(int x, int li=0, int ri=2*n,int index=1) {
if(li==ri) tree[index] = 1;
else {
int mid = (li+ri) /2;
if(x <= mid) update(x, li, mid, 2*index);
else if(x > mid) update(x, mid+1, ri, 2*index+1);
}
}
int query(int ql, int qr, int li=0, int ri=2*n, int index=1) {
if(qr < ql) return 0;
if(li > qr || ri < ql) return 0;
else if(li >= ql && ri <= qr) return tree[index];
else {
int mid = (li+ri)/2;
return query(ql,qr,li,mid,2*index) + query(ql,qr,mid+1,ri,2*index+1);
}
}
int main() {
cin>>n;
for(int i=1;i<=n;i++) {
cin>>b[i];
}
a[1] = b[1];
used[b[1]] = true;
update(b[1]);
int st = 1, fh = 2*n-1;
if(b[1] == 1) st = 2;
else st = 1;
if(b[1] == 2*n-1) fh = 2*n-2;
else fh = 2*n-1;
for(int i=2;i<=n;i++) {
//cout<<i<<" -> ";
if(used[b[i]]) {
//cout<<"Placing A: "<<st<<" "<<fh<<" -> ";
a[2*(i-1)] = st;
a[2*(i-1)+1] = fh;
update(st); update(fh);
used[st] = used[fh] = true;
while(used[st] && st < 2 * n) st++;
while(used[fh] && fh > 0) fh--;
//cout<<st<<" "<<fh<<"\n";
}
else {
//cout<<"Placing B: "<<st<<" "<<fh<<" -> ";
a[2*(i-1)] = b[i];
used[b[i]] = true;
update(b[i]);
int temp = query(1, b[i]-1);
while(used[st] && st < 2 * n) st++;
while(used[fh] && fh > 0) fh--;
if(temp == (i-1)) {
// stavi pogolemo
a[2*(i-1)+1] = fh;
used[fh] = true;
update(fh);
while(used[fh] && fh > 0) fh--;
}
else if(temp < (i-1)) {
// stavi pomalo
a[2*(i-1)+1] = st;
used[st] = true;
update(st);
while(used[st] && st < 2 * n) st++;
}
//cout<<st<<" "<<fh<<"\n";
}
}
for(int i=1;i<=2*n-1;i++) {
cout<<a[i]<<" ";
}
return 0;
}
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Correct |
3 ms |
376 KB |
Output is correct |
2 |
Incorrect |
2 ms |
452 KB |
Output isn't correct |
3 |
Incorrect |
2 ms |
452 KB |
Output isn't correct |
4 |
Incorrect |
3 ms |
520 KB |
Output isn't correct |
5 |
Incorrect |
3 ms |
520 KB |
Output isn't correct |
6 |
Correct |
2 ms |
636 KB |
Output is correct |
7 |
Incorrect |
2 ms |
640 KB |
Output isn't correct |
8 |
Incorrect |
2 ms |
644 KB |
Output isn't correct |
9 |
Incorrect |
4 ms |
692 KB |
Output isn't correct |
10 |
Incorrect |
2 ms |
696 KB |
Output isn't correct |
11 |
Incorrect |
2 ms |
696 KB |
Output isn't correct |
12 |
Incorrect |
3 ms |
788 KB |
Output isn't correct |
13 |
Incorrect |
3 ms |
836 KB |
Output isn't correct |
# |
Verdict |
Execution time |
Memory |
Grader output |
1 |
Incorrect |
4 ms |
836 KB |
Output isn't correct |
2 |
Incorrect |
6 ms |
904 KB |
Output isn't correct |
3 |
Incorrect |
9 ms |
1176 KB |
Output isn't correct |
4 |
Incorrect |
15 ms |
1488 KB |
Output isn't correct |
5 |
Incorrect |
27 ms |
2224 KB |
Output isn't correct |
6 |
Incorrect |
50 ms |
3844 KB |
Output isn't correct |
7 |
Incorrect |
77 ms |
6288 KB |
Output isn't correct |