#include<bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
//using namespace __gnu_pbds;
using namespace std;
typedef long double ld;
typedef long long ll;
typedef unsigned long long ull;
typedef vector<int> vi;
typedef vector<vector<int>> vvi;
typedef vector<ll> vl;
typedef vector<vl> vvl;
typedef pair<int, int> pi;
typedef pair<ll, ll> pl;
typedef vector<pl> vpl;
typedef vector<ld> vld;
typedef pair<ld, ld> pld;
typedef vector<pi> vpi;
//typedef tree<ll, null_type, less_equal<ll>,rb_tree_tag,tree_order_statistics_node_update> ordered_set;
template<typename T>
ostream &operator<<(ostream &os, vector<T> &a) {
os << "[";
for (int i = 0; i < ll(a.size()); i++) { os << a[i] << ((i != ll(a.size() - 1) ? " " : "")); }
os << "]\n";
return os;
}
#define all(x) x.begin(),x.end()
#define YES out("YES")
#define NO out("NO")
#define out(x){cout << x << "\n"; return;}
#define GLHF ios_base::sync_with_stdio(false); cin.tie(NULL);cout.tie(NULL)
#define print(x){for(auto ait:x) cout << ait << " "; cout << "\n";}
#define pb push_back
#define umap unordered_map
template<typename T1, typename T2>
istream &operator>>(istream &is, pair<T1, T2> &p) {
is >> p.first >> p.second;
return is;
}
template<typename T1, typename T2>
ostream &operator<<(ostream &os, pair<T1, T2> &p) {
os << "" << p.first << " " << p.second << "";
return os;
}
void usaco(string taskname) {
string fin = taskname + ".in";
string fout = taskname + ".out";
const char *FIN = fin.c_str();
const char *FOUT = fout.c_str();
freopen(FIN, "r", stdin);
freopen(FOUT, "w", stdout);
}
template<typename T>
void read(vector<T> &v) {
int n = v.size();
for (int i = 0; i < n; i++)
cin >> v[i];
}
template<typename T>
vector<T> UNQ(vector<T> a) {
vector<T> ans;
for (T t: a)
if (ans.empty() || t != ans.back())
ans.push_back(t);
return ans;
}
ll ceil(ll a, ll b) {
ll ans = a / b;
if (a % b)ans++;
return ans;
}
ld log(ld a, ld b) { return log(b) / log(a); }
ll power(ll base, ll exp, ll M = 1e18) {//(base^exp)%M
ll ans = 1;
while (exp) {
if (exp % 2 == 1)ans = ((ans % M) * (base % M)) % M;
base = ((base % M) * (base % M)) % M;
exp /= 2;
}
return ans;
}
string to_base(int n, int new_base) {
string s;
int nn = n;
while (nn) {
s += to_string(nn % new_base);
nn /= new_base;
}
reverse(all(s));
return s;
}
ll gcd(ll a, ll b) {
if (a < b)swap(a, b);
if (b == 0)return a;
return gcd(b, a % b);
}
ll lcm(ll a, ll b) {
ll x = (a / gcd(a, b));
return b * x;
}
vl generate_array(ll n, ll mn = 1, ll mx = 1e18 + 1) {
if (mx == 1e18 + 1)
mx = n;
vl ans(n);
for (int i = 0; i < n; i++)
ans[i] = (mn + rand() % (mx - mn + 1));
return ans;
}
string substr(string s, int l, int r) {
string ans;
for (int i = l; i <= r; i++)
ans += s[i];
return ans;
}
void solve();
int main() {
GLHF;
int t = 1;
//cin >> t;
while (t--)
solve();
}
void solve() {
int n;
cin >> n;
set<int>out;
vi a(n);
read(a);
for(int i=1; i<=2*n-1; i++)
out.insert(i);
for(int i=0; i<n; i++)
out.erase(a[i]);
vi ans(2*n-1);
ans[0]=a[0];
vector<bool>used(2*n);
used[a[0]]=1;
for(int i=1; i<n; i++){
if(!used[a[i]]){
used[a[i]]=1;
ans[2*i-1]=a[i];
if(a[i]<a[i-1])
ans[2*i]=*(--out.upper_bound(a[i]));
else if(a[i]>a[i-1])
ans[2*i]=*out.upper_bound(a[i]);
else assert(0);
out.erase(ans[2*i]);
out.erase(ans[2*i-1]);
continue;
}
if(a[i]==a[i-1]) {
ans[2 * i] = *(--out.upper_bound(a[i]));
ans[2 * i - 1] = *out.upper_bound(a[i]);
}
else if(a[i]<a[i-1]) {
ans[2 * i] = *(--out.upper_bound(a[i]));
out.erase(ans[2*i]);
ans[2 * i - 1] = *(--out.upper_bound(a[i]));
}
else {
ans[2 * i] = *out.upper_bound(a[i]);
out.erase(ans[2*i]);
ans[2 * i - 1] = *(out.upper_bound(a[i]));
}
used[ans[2*i]]=1;
out.erase(ans[2*i]);
out.erase(ans[2*i-1]);
}
print(ans)
}
Compilation message
medians.cpp: In function 'void usaco(std::string)':
medians.cpp:57:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
57 | freopen(FIN, "r", stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~
medians.cpp:58:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
58 | freopen(FOUT, "w", stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Correct |
0 ms |
204 KB |
Output is correct |
| 2 |
Incorrect |
0 ms |
204 KB |
Not a permutation |
| 3 |
Incorrect |
0 ms |
204 KB |
Output isn't correct |
| 4 |
Incorrect |
0 ms |
204 KB |
Not a permutation |
| 5 |
Incorrect |
0 ms |
204 KB |
Not a permutation |
| 6 |
Correct |
0 ms |
204 KB |
Output is correct |
| 7 |
Incorrect |
0 ms |
204 KB |
Not a permutation |
| 8 |
Incorrect |
0 ms |
204 KB |
Not a permutation |
| 9 |
Incorrect |
1 ms |
204 KB |
Not a permutation |
| 10 |
Incorrect |
1 ms |
204 KB |
Output isn't correct |
| 11 |
Incorrect |
0 ms |
332 KB |
Not a permutation |
| 12 |
Incorrect |
1 ms |
384 KB |
Not a permutation |
| 13 |
Incorrect |
1 ms |
332 KB |
Not a permutation |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Incorrect |
2 ms |
460 KB |
Not a permutation |
| 2 |
Incorrect |
3 ms |
716 KB |
Not a permutation |
| 3 |
Incorrect |
6 ms |
1228 KB |
Not a permutation |
| 4 |
Incorrect |
14 ms |
2124 KB |
Not a permutation |
| 5 |
Incorrect |
27 ms |
3980 KB |
Not a permutation |
| 6 |
Incorrect |
60 ms |
7840 KB |
Not a permutation |
| 7 |
Incorrect |
107 ms |
12180 KB |
Not a permutation |
