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>
#define FOR(i, x, y) for (int i = x; i < y; i++)
typedef long long ll;
using namespace std;
bool visited[200000];
int seq[200000];
queue<int> l, g;
int main() {
ios_base::sync_with_stdio(0);
cin.tie(0);
int n, curr;
cin >> n >> seq[1];
visited[seq[1]] = true;
curr = seq[1];
FOR(i, 1, n) {
int x;
cin >> x;
if (curr == x) {
l.push(2 * i);
g.push(2 * i + 1);
} else if (curr < x) {
g.push(2 * i);
g.push(2 * i + 1);
if (!visited[x]) {
seq[g.front()] = x;
visited[x] = true;
g.pop();
}
} else {
l.push(2 * i);
l.push(2 * i + 1);
if (!visited[x]) {
seq[l.front()] = x;
visited[x] = true;
l.pop();
}
}
curr = x;
}
int indx = 1;
while (l.size()) {
while (visited[indx]) indx++;
seq[l.front()] = indx++;
l.pop();
}
while (g.size()) {
while (visited[indx]) indx++;
seq[g.front()] = indx++;
g.pop();
}
FOR(i, 1, 2 * n) cout << seq[i] << ' ';
cout << '\n';
return 0;
}
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